Cash ISA UK: rates, rules, allowance and how to choose

The cash ISA has been a fixture of UK retail saving since 1999, when it replaced the older TESSA. The wrapper is simple in principle: cash sits in a deposit account, the account is registered with HMRC as an ISA, and interest paid is not counted as taxable income. There is an annual subscription limit set in legislation, and an FSCS protection limit on the underlying deposit. Beyond those rules, a cash ISA behaves like any other savings account.

This guide explains how cash ISAs work in practice for the 2026-27 tax year. It covers the allowance and how it splits across stocks and shares, innovative finance and Lifetime ISAs; the difference between easy-access, fixed-rate and notice products; the transfer mechanics that preserve tax-free status; FSCS protection limits; and the point at which a cash ISA is or is not worth holding compared with a taxable savings account. The figures used are based on legislation and HMRC guidance current at the time of writing; thresholds and rules can change at fiscal events, so any specific number quoted should be reconfirmed on GOV.UK before being acted on.

The sections below cover how rates are set, where the 20,000 pound allowance fits, how to move an ISA without losing the wrapper, who can open one, what to look at when comparing providers, and how a cash ISA stacks up against an ordinary savings account once the Personal Savings Allowance is taken into account.

What a cash ISA is

A cash ISA (Individual Savings Account) is a tax-advantaged savings wrapper introduced by the Individual Savings Account Regulations 1998 and amended numerous times since. The wrapper sits around a deposit account held with a bank, building society or National Savings & Investments. Interest credited inside the wrapper is not subject to UK income tax for the account holder, and the holder does not have to declare the interest on a Self Assessment return.

The ISA family currently includes four wrappers a UK saver can subscribe to: cash ISA, stocks and shares ISA, innovative finance ISA and Lifetime ISA. There is also the Junior ISA for under-18s, which has its own separate allowance. The cash ISA holds cash deposits only. A stocks and shares ISA holds qualifying investments such as shares, funds, gilts and corporate bonds. The innovative finance ISA holds peer-to-peer loans. The Lifetime ISA can hold either cash or investments but is governed by its own additional rules, including a 25 percent government bonus and a 25 percent withdrawal charge for non-qualifying withdrawals before age 60.

The defining feature of any ISA is the tax wrapper, not the underlying product. A cash ISA paying 4 percent and an ordinary savings account paying 4 percent generate the same gross interest. The difference is that the ordinary savings account's interest counts toward the saver's Personal Savings Allowance and may be taxed at the saver's marginal rate of income tax, while the cash ISA's interest is outside the income tax system entirely. For higher-rate or additional-rate taxpayers, that difference can be material; for basic-rate taxpayers with modest savings balances, it may be small or nil.

How a cash ISA is registered with HMRC

When a saver opens a cash ISA, the provider records the ISA subscription against the saver's National Insurance number and reports the subscription to HMRC after the end of the tax year. HMRC uses these returns to monitor whether any saver has exceeded the annual allowance across providers. If subscriptions across multiple providers add up to more than the annual limit, HMRC instructs the providers on how to repair the position, typically by removing the excess and any associated interest. Interest credited inside a cash ISA does not appear on a P60, is not reported as taxable interest, and does not need to be declared on Self Assessment. The interest is also outside the scope of the Personal Savings Allowance.

Cash ISA interest rates and how they work

Cash ISA interest rates are set by the provider and are influenced by the Bank of England Bank Rate, by competition for deposits and by the term of the product. There is no government-set ISA rate. Each provider publishes a gross AER (Annual Equivalent Rate) for the product, which is the standardised rate used to compare different compounding frequencies on a like-for-like basis. AER assumes interest is left in the account for a full year.

Variable-rate cash ISAs (easy-access and most notice accounts) have a rate the provider can change with notice. Under the FCA's Banking: Conduct of Business Sourcebook (BCOBS) rules, providers must give reasonable notice of material rate reductions, typically 14 to 60 days depending on the change and the type of account. Variable rates can move up as well as down and are usually tied loosely to Bank Rate movements, though providers retain discretion.

Fixed-rate cash ISAs lock the rate for a defined term, commonly one, two, three or five years. The rate is set when the account is opened and does not change for the term, regardless of what Bank Rate does. The trade-off is access: most fixed-rate ISAs either prohibit withdrawals before maturity or apply an interest penalty for early access, usually expressed as a number of days' interest (60, 90, 180 or 365 days are common, depending on the term).

How interest is paid

Interest can be paid into the ISA itself (compounding inside the wrapper), paid to a linked external account or paid as a lump sum at maturity for fixed-rate products. Paying interest into the ISA keeps subsequent interest tax-free; paying it out makes the original interest tax-free but any onward interest in the external account is potentially taxable.

Bonus rates and headline figures

Some easy-access cash ISAs advertise a headline rate that includes a fixed-term bonus, often 12 months, after which the rate drops to a lower underlying rate. The headline AER reflects the bonus over the full year. Checking the post-bonus rate matters for any saver who intends to leave funds in the account beyond the bonus period. For much of the past decade, cash ISA rates ran slightly behind comparable ordinary savings rates, because providers priced in the operational cost of running ISA infrastructure and HMRC reporting. The gap has narrowed at various points. Comparing post-tax outcomes is the right approach, since the headline gross rate alone does not capture the difference for higher-rate or additional-rate taxpayers.

The 20,000 pound ISA allowance and how it splits

The annual ISA allowance for the 2026-27 tax year is 20,000 pounds. This is the total amount that can be subscribed across all adult ISA wrappers in the tax year (6 April to 5 April). The allowance is per person, not per household. Unused allowance does not carry forward; whatever is not used by 5 April is lost, and a fresh 20,000 pound allowance starts on 6 April. Verify the current allowance on GOV.UK before relying on a specific figure, as ISA limits have changed at fiscal events in past years.

The allowance can be split across the four adult ISA types in any combination, up to the total. For example, a saver could put 10,000 pounds in a cash ISA, 6,000 pounds in a stocks and shares ISA and 4,000 pounds in a Lifetime ISA in the same tax year, totalling 20,000 pounds. The Lifetime ISA has its own annual contribution cap of 4,000 pounds (which counts inside the 20,000 pound overall allowance). Junior ISAs have a separate allowance for under-18s, which does not affect the adult allowance.

Multiple cash ISAs in the same tax year

From 6 April 2024, the long-standing restriction limiting a saver to one cash ISA subscription per tax year was removed for the main adult wrappers. A saver can now pay new money into more than one cash ISA in the same tax year, provided the total across all subscriptions stays within the 20,000 pound annual limit. This change makes it easier to use, for example, an easy-access cash ISA for emergency funds and a separate fixed-rate cash ISA for medium-term savings without breaching the rules. The Lifetime ISA remains subject to its own one-LISA-per-year subscription rule.

Subscriptions, transfers and what counts as new money

The 20,000 pound allowance applies only to new subscriptions. Transferring existing ISA balances from a previous tax year (or from earlier in the current year, under post-2024 rules) does not count toward the allowance. A saver with 100,000 pounds in cash ISAs from prior years can still subscribe a fresh 20,000 pounds in the current year, and can move the existing 100,000 pounds between providers without consuming any allowance.

What happens if the allowance is exceeded

If a saver inadvertently exceeds the 20,000 pound allowance, HMRC will normally identify the over-subscription from the providers' annual returns and write to the saver after the end of the tax year. HMRC then instructs the relevant provider to remove the excess subscription and any interest earned on it from the wrapper. The interest then becomes taxable. The saver should not pre-emptively remove funds without HMRC instruction, as this can create new compliance issues.

Fixed-rate vs easy-access cash ISAs

The two largest cash ISA categories by deposit volume are easy-access and fixed-rate. Each suits a different purpose, and many savers hold both.

Easy-access cash ISAs

An easy-access cash ISA pays a variable interest rate and allows withdrawals at any time without an interest penalty. The trade-off is rate certainty: the provider can change the rate (with notice as required by BCOBS), and the rate is typically lower than on a long fixed-rate ISA at the same provider. Some easy-access cash ISAs limit the number of penalty-free withdrawals per year; exceeding that limit drops the rate to a lower tier for the remainder of the year. Easy-access products suit emergency funds, short-term goals and cash that may be needed at unpredictable times.

Fixed-rate cash ISAs

A fixed-rate cash ISA locks the rate for a defined term (commonly one, two, three or five years) and usually restricts withdrawals during that term. Early access is either disallowed or subject to an interest penalty of typically 60 to 365 days' worth of interest. At maturity, the funds usually roll into a variable-rate maturity account or can be transferred. Fixed-rate products suit cash that the saver is confident will not be needed during the term. Rate certainty is the main benefit when rates are expected to fall, and the main disadvantage when rates rise.

Notice cash ISAs

A notice cash ISA sits between easy-access and fixed. The saver gives a defined number of days' notice (commonly 30, 60, 90 or 120) before a withdrawal; during the notice period the funds remain in the account earning interest. The rate is usually variable, and longer notice periods tend to pay higher rates. Notice ISAs suit cash that does not need to be instantly liquid but where the saver wants more rate stability than easy-access without committing to a fixed term.

Regular saver cash ISAs

A regular saver cash ISA accepts monthly contributions up to a defined limit (commonly 200 to 500 pounds per month) and typically pays a relatively high headline rate. The average balance over the year is much lower than the maximum, so the actual pounds of interest earned is smaller than a quick look at the rate suggests.

How to transfer a cash ISA without losing the allowance

The transfer process is the single most important operational detail of the ISA system. Done correctly, a transfer preserves the tax-free status of all prior-year and current-year subscriptions. Done incorrectly (by withdrawing money and redepositing it into a new ISA), the withdrawn funds lose the tax wrapper and any redeposit counts as a fresh subscription against the current year's allowance.

To transfer correctly, the saver opens an account with the new provider (or selects an existing one) and completes that provider's ISA transfer request form. The new provider contacts the old provider directly, requests the funds and updates HMRC. The funds move provider-to-provider, the ISA wrapper is preserved and no allowance is consumed.

Transfer time limits and standards

Cash-to-cash ISA transfers must complete within 15 working days, under HMRC and industry standards. Cash-to-stocks-and-shares ISA transfers (and the reverse) have a 30-calendar-day target. If a transfer takes longer, the saver can complain to the receiving provider and, if not resolved, escalate to the Financial Ombudsman Service. The receiving provider is responsible for chasing the old provider; the saver does not need to communicate with the old provider after the transfer is initiated.

Current-year vs prior-year subscriptions

Until April 2024, current-year subscriptions had to be transferred in full (the saver could not move part of the current year's contributions and leave the rest behind). From 6 April 2024 the rules allow partial transfers of current-year subscriptions, subject to the receiving and sending providers' systems supporting the option. Prior-year subscriptions can be transferred in full or in part regardless. Providers vary in what they will accept, so the saver should confirm with the new provider before initiating.

Common transfer mistakes

Two mistakes recur. The first is withdrawing cash and paying it into a different ISA rather than using a transfer form: the withdrawn cash leaves the wrapper, and the deposit counts as a fresh subscription against the current year. The second is closing one ISA and trying to reopen the same balance elsewhere months later: once the cash is outside the wrapper, it cannot be put back in except via fresh subscription, subject to the annual allowance.

Who can open a cash ISA

To open and pay into an adult cash ISA, an individual must be aged 18 or over (this was raised from 16 in April 2024 for new cash ISA subscriptions; transitional rules covered existing 16- and 17-year-old holders) and resident in the United Kingdom for tax purposes. Crown employees serving overseas, including their spouses or civil partners, are treated as UK resident for this purpose. Becoming non-resident does not close an existing ISA; the saver can keep it open and continue earning tax-free interest, but cannot make further subscriptions until UK resident again.

Junior cash ISAs

A Junior ISA is for children under 18 who do not have a Child Trust Fund. The 2026-27 annual JISA allowance is 9,000 pounds (verify on GOV.UK), separate from the 20,000 pound adult allowance. The account is opened by a parent or guardian and held in the child's name; the child takes control at 16 and can withdraw from 18. A Junior cash ISA holds cash deposits; a Junior stocks and shares ISA holds investments; only one of each type can be held at any one time, and a JISA cannot run alongside an active Child Trust Fund (the CTF would be transferred in).

Lifetime ISA eligibility

The Lifetime ISA is open to UK residents aged 18 to 39 at account opening. Contributions can continue to age 50. The 4,000 pound annual LISA limit counts toward the overall 20,000 pound allowance. Withdrawals for a first home up to 450,000 pounds, or after age 60, or in cases of terminal illness, attract no charge. Other withdrawals incur a 25 percent withdrawal charge on the gross amount, which can leave the saver with less than they paid in.

Joint accounts and surviving spouses

An ISA must be held in a single individual's name; joint cash ISAs do not exist. A married couple or civil partners can each hold their own cash ISA and use their own 20,000 pound allowance. On the death of an ISA holder, a surviving spouse or civil partner is entitled to an Additional Permitted Subscription (APS) equal to the value of the deceased's ISAs at the date of death (or at the date the ISA is closed, where higher), in addition to the survivor's own annual allowance.

How to compare providers

Comparing cash ISA providers is mostly about rate, term, access conditions and FSCS protection. The headline AER is the starting point, but the small print determines whether the rate the saver actually earns matches the rate advertised.

Rate, tiers and access conditions

The advertised AER may include a 12-month bonus that drops off, or may apply only within a balance tier (for example, the headline rate on the first 50,000 pounds and a lower rate above). For long-term holdings, the post-bonus rate is the relevant figure. The product summary lists access conditions: number of penalty-free withdrawals per year, notice period (if any), and any rate reductions or penalties for breaches.

FSCS protection

Cash held in a cash ISA at a UK-authorised bank or building society is covered by the Financial Services Compensation Scheme up to 85,000 pounds per person per banking licence. The "per banking licence" point is important: brands that share a licence share the limit. For example, Halifax, Bank of Scotland and the now-closed Birmingham Midshires share one licence; HSBC and First Direct share another. The FSCS website's "check your money is protected" tool lists current groupings. A saver with more than 85,000 pounds across the same licence is uninsured on the excess.

Transfer-in policies and operational practicalities

Not every provider accepts inbound transfers from other ISAs. Some accept only new subscriptions. Confirm the transfer-in policy before opening, particularly if the plan is to consolidate prior-year ISAs into the new product. Where partial transfers of current-year subscriptions are needed, confirm that both providers support the option.

NS&I and access channels

Some providers operate only online or only through an app. Some require funds to be moved through a linked nominated account, which restricts where money can be withdrawn to. None of these factors changes the tax wrapper, but they affect the experience of running the account. National Savings & Investments offers a Direct ISA (variable rate, easy access) backed by HM Treasury rather than the 85,000 pound FSCS limit, which can simplify the operational set-up for very large balances where bank-level FSCS limits would otherwise force a spread across multiple licences.

Cash ISA vs ordinary savings account

The honest comparison between a cash ISA and an ordinary savings account depends on the saver's tax position and the size of the savings balance. The mechanics are different, the gross rates are usually similar, and the net outcome is what matters.

The Personal Savings Allowance

Interest earned on ordinary savings accounts is potentially taxable as income, but the Personal Savings Allowance (PSA) shelters the first slice each tax year. A basic-rate taxpayer has a 1,000 pound PSA; a higher-rate taxpayer has 500 pounds; an additional-rate taxpayer has no PSA. Interest above the PSA is taxed at the saver's marginal rate (20, 40 or 45 percent in England, Wales and Northern Ireland; Scotland uses its own income tax bands, which differ).

For a basic-rate taxpayer earning 4 percent on ordinary savings, the 1,000 pound PSA covers interest on a balance of 25,000 pounds. Below that balance, the cash ISA gives no income-tax saving (because the ordinary savings interest is already inside the PSA). Above that balance, the cash ISA shelters interest that would otherwise be taxed at 20 percent. For a higher-rate taxpayer, the 500 pound PSA covers 12,500 pounds at the same rate; for an additional-rate taxpayer with no PSA, every pound of interest is taxable.

When the cash ISA outperforms net of tax

For higher-rate or additional-rate taxpayers with material savings balances, the cash ISA generally produces a higher net return than an equivalent gross-rate ordinary savings account once the PSA is used. For basic-rate taxpayers with smaller balances, the gap is narrow or zero. For an additional-rate taxpayer, every pound of interest inside the cash ISA saves 45 pence of tax that would otherwise be due on ordinary savings.

When the ordinary savings account wins

Where the ordinary savings rate is meaningfully higher than the best cash ISA rate available, the gross-rate advantage may exceed the tax saving the ISA would have produced. This happens periodically when ordinary savings markets become more competitive than ISA markets. The arithmetic to check: the post-tax return on the ordinary account is gross rate multiplied by (1 minus marginal tax rate applied to the portion above the PSA). The cash ISA return is the gross ISA rate, with no deduction. Over a decade or longer, the compounded tax saving on a steadily growing ISA balance can become significant relative to a taxable account, particularly for higher-rate and additional-rate taxpayers.

When a cash ISA is worth it

Putting it all together, a cash ISA is worth holding in several common scenarios, and is less obviously valuable in others.

Higher-rate and additional-rate taxpayers

For a higher-rate taxpayer with savings above the 500 pound PSA (exceeded by a balance of around 12,500 pounds at a 4 percent rate), the cash ISA shelters interest that would otherwise be taxed at 40 percent. For an additional-rate taxpayer with no PSA, every pound of interest inside the ISA saves 45 pence of tax.

Savers with growing balances

A saver who expects to accumulate a substantial cash balance over time (deposit savings, emergency fund, business reserve held personally) benefits from using each year's 20,000 pound allowance, because the allowance does not carry forward. Filling the wrapper steadily over years means a much larger pool of cash sits permanently inside the tax shelter than would be possible by leaving it all to a single year.

Basic-rate taxpayers with modest balances

A basic-rate taxpayer with savings under about 25,000 pounds at typical rates may earn no more after tax inside a cash ISA than they would in a higher-paying ordinary savings account, because the PSA already shelters the interest. In that situation, the cash ISA is valuable mainly as a wrapper for future growth: filling the allowance while the saver can means the wrapper is in place when the balance grows, the rate moves, or the saver's tax band changes.

When other ISAs may take priority and when a cash ISA is not the answer

For long-term goals (10 years or more), a stocks and shares ISA inside the same 20,000 pound annual allowance has historically delivered higher returns than cash, though with capital risk. For a first home purchase under the LISA price cap, the Lifetime ISA's 25 percent bonus typically outweighs the cash ISA's tax saving, subject to the LISA's separate rules. A saver carrying high-cost unsecured debt (credit card balances at typical APRs, personal loans at high rates) generally gets a higher net financial return from paying down that debt first, because the interest rate on the debt is usually higher than the rate any cash ISA pays.

How we verified this

The rules in this guide reflect the Individual Savings Account Regulations 1998 (as amended), HMRC's published ISA Manager guidance, and the Savings (Government Contributions) Act 2017 for the Lifetime ISA elements. The 2026-27 annual allowance of 20,000 pounds and the Junior ISA allowance of 9,000 pounds are taken from current GOV.UK guidance; both have been stable through recent fiscal events but can change, and should be reconfirmed on GOV.UK before any subscription. FSCS protection limits and the per-banking-licence rule are taken directly from the Financial Services Compensation Scheme website, including its "check your money is protected" tool. The transfer time limits (15 working days for cash-to-cash, 30 calendar days for cash-to-investment) are from the HMRC ISA Manager guidance and industry transfer code. Rate-change notice rules for variable-rate accounts come from the FCA's Banking: Conduct of Business Sourcebook. The Personal Savings Allowance amounts and the income tax bands referenced are 2026-27 figures from GOV.UK; Scottish income tax bands are set separately by the Scottish Government and should be checked on revenue.scot or GOV.UK where the saver is a Scottish taxpayer.

Frequently asked questions

What is the cash ISA allowance for the 2026-27 tax year?

The total ISA allowance for the 2026-27 tax year is 20,000 pounds across all adult ISA wrappers combined (cash, stocks and shares, innovative finance, Lifetime). This is the figure available on GOV.UK at the time of writing and should be reconfirmed there before relying on it, as ISA limits can change at fiscal events.

Can a saver pay into more than one cash ISA in the same tax year?

Yes, from 6 April 2024 the rules allow subscriptions to multiple cash ISAs in the same tax year, provided the total stays within the 20,000 pound annual allowance. The previous one-cash-ISA-per-year restriction was removed for the main adult wrappers. The Lifetime ISA remains subject to its own one-LISA-per-year subscription rule.

Is interest in a cash ISA really tax-free?

Yes. Interest credited inside the wrapper is exempt from UK income tax, is not declared on Self Assessment and does not use any of the Personal Savings Allowance. The exemption lasts for as long as the funds remain inside the wrapper.

What happens to a cash ISA if the saver becomes non-resident?

Existing balances continue to earn tax-free interest; the wrapper is not closed automatically. New subscriptions are not permitted while non-resident (other than for Crown employees and their spouses or civil partners). The saver can resume subscribing on becoming UK resident again.

How is a cash ISA transfer different from a withdrawal?

A transfer moves the funds from one ISA provider to another directly, preserving the tax wrapper. A withdrawal removes the funds from the wrapper entirely, and any redeposit into a new ISA counts as a fresh subscription against the current year's allowance. Always use the new provider's ISA transfer form rather than withdrawing and redepositing.

How long should a cash ISA transfer take?

Cash-to-cash transfers must complete within 15 working days under HMRC and industry standards. Cash-to-stocks-and-shares transfers (and the reverse) have a 30 calendar day target. Delays beyond that can be escalated to the Financial Ombudsman Service.

Are flexible cash ISAs the same as ordinary ones?

A flexible cash ISA lets the saver withdraw funds and replace them within the same tax year without using extra allowance, provided the replacement is into the same ISA. Not all cash ISAs are flexible; the feature has to be specified by the provider.

What is the FSCS protection limit for cash ISAs?

Cash ISA deposits with a UK-authorised bank or building society are protected up to 85,000 pounds per person per banking licence by the Financial Services Compensation Scheme. Brands that share a licence share the limit. National Savings & Investments deposits are backed by HM Treasury and are not subject to the 85,000 pound limit.

Can two people open a joint cash ISA?

No. ISAs must be held in a single individual's name. A married couple or civil partners can each open their own cash ISA and each use their own 20,000 pound annual allowance, but there is no such thing as a joint ISA.

What happens to a cash ISA when the holder dies?

On death, the ISA wrapper continues until the executor closes the account or three years pass, whichever is sooner. Interest earned in that period remains tax-free. A surviving spouse or civil partner is entitled to an Additional Permitted Subscription (APS) equal to the value of the deceased's ISAs, which is in addition to the survivor's own annual allowance.

Is a cash ISA covered by FSCS if held with a foreign-owned bank?

If the bank is PRA-authorised and operates as a UK subsidiary, FSCS protection of 85,000 pounds per person per banking licence applies. If the bank operates as a branch of an overseas bank, the home country's deposit protection scheme may apply instead. The FCA register confirms the relevant authorisation status.

Can a fixed-rate cash ISA be closed early?

Most fixed-rate cash ISAs either prohibit early closure or apply an interest penalty of typically 60 to 365 days' interest, depending on the term. Some allow closure on grounds of bereavement or financial hardship without penalty.

Does a cash ISA affect a means-tested benefit?

Yes. Cash held in an ISA counts as capital for means-tested benefits such as Universal Credit and Pension Credit. The tax wrapper does not shelter the capital from the benefit assessment. The capital limits and tapering rules are set by the Department for Work and Pensions and are explained on GOV.UK.

What is the difference between a cash ISA and a Lifetime ISA?

A cash ISA holds cash deposits and offers tax-free interest. A Lifetime ISA can hold cash or investments and adds a 25 percent government bonus on contributions up to 4,000 pounds a year, but applies a 25 percent withdrawal charge on non-qualifying withdrawals before age 60. The 4,000 pound LISA contribution counts within the overall 20,000 pound allowance.

Can a child have a cash ISA?

Under-18s cannot open an adult cash ISA. A Junior ISA can be opened in the child's name by a parent or guardian, with a separate annual allowance of 9,000 pounds for 2026-27. The child takes control of the JISA at 16 and can withdraw from 18.

What happens at the end of a fixed-rate cash ISA term?

At maturity, the funds usually transfer automatically into a variable-rate maturity account at a lower rate than the original fix. The provider sends a maturity notice in advance, with options including renewing into a new fixed-rate product or transferring to another provider.

How is interest calculated on a cash ISA?

Interest is calculated daily on the cleared balance and credited at a frequency stated in the terms, often monthly, annually or at maturity. AER expresses the rate on a like-for-like annualised basis. Interest paid into the ISA compounds tax-free; interest paid out to a linked external account is then subject to ordinary tax rules.

What records does HMRC see for a cash ISA?

The provider reports each saver's annual subscription total to HMRC, identified by National Insurance number. HMRC uses these returns to verify the 20,000 pound annual limit has not been exceeded across providers. Interest credited inside the wrapper is not reported as taxable interest.

Can a cash ISA balance be moved to a stocks and shares ISA?

Yes. A cash ISA balance (current year and prior years) can be transferred to a stocks and shares ISA using the new provider's transfer form, preserving the wrapper. The cash arrives as cash in the investment account and is invested separately by the saver. The reverse direction also works.

Does an Additional Permitted Subscription have to be made to the same provider?

No. The APS can be used with a different ISA provider. The survivor's chosen provider arranges the documentation, including evidence of the relationship and the value of the deceased's ISAs. The APS has time limits: typically three years from the date of death or 180 days from final closure of the ISA, whichever is later.

Can a non-UK national open a cash ISA?

Yes, provided the individual is UK resident for tax purposes and aged 18 or over. Nationality on its own does not determine eligibility; UK tax residence does. Becoming non-resident does not close an existing ISA but prevents further subscription.

What documents are needed to open a cash ISA?

The provider asks for proof of identity (passport, driving licence), proof of address (utility bill, bank statement) and the saver's National Insurance number. Some providers verify identity electronically and need no paper documents.

Are cash ISA interest rates guaranteed to track Bank Rate?

No. The provider sets the rate at its discretion, influenced but not bound by Bank of England Bank Rate changes. Tracker products that explicitly link to Bank Rate exist but are uncommon. Most variable-rate cash ISAs change at the provider's discretion, with notice as required by BCOBS.

Can a cash ISA be opened in the last week of the tax year?

Yes. The 20,000 pound allowance is available until 5 April. A saver subscribing close to the deadline should allow time for account opening and funding, particularly for postal applications. From 6 April a new 20,000 pound allowance is available.

Is there a minimum opening balance for a cash ISA?

Minimums vary by provider and product. Many easy-access cash ISAs accept a minimum of 1 pound, while some fixed-rate or high-rate products require 500, 1,000 or 5,000 pounds to open. The product summary states the minimum and any maximum balance the provider will accept.

How does a regular saver cash ISA work?

A regular saver cash ISA accepts a fixed maximum monthly contribution (commonly 200 to 500 pounds) for 12 months at a headline AER. Because interest is calculated on the average balance (about half the closing balance), the pounds of interest earned can be smaller than the AER suggests.

Can the 20,000 pound allowance be split between cash and stocks and shares?

Yes. The 20,000 pound allowance can be divided in any combination across the four adult ISA types (cash, stocks and shares, innovative finance, Lifetime), provided the Lifetime ISA portion does not exceed 4,000 pounds. Common splits use a cash ISA for short-term reserves and a stocks and shares ISA for long-term investing.

What is the position on cash ISAs for Scottish taxpayers?

ISA rules are reserved to the UK Parliament, so the 20,000 pound allowance and the cash ISA mechanics apply identically to Scottish taxpayers. The Personal Savings Allowance is also reserved. Scottish income tax bands differ for ordinary savings interest above the PSA, so after-tax comparisons use Scottish band rates for Scottish residents.

Does inflation make a cash ISA pointless?

When the rate paid is below the rate of inflation, the real value of the balance falls. The wrapper still saves tax on the nominal interest, but does not offset the loss in purchasing power. For long-term goals, investment-based ISAs have historically beaten inflation more often than cash; for short-term reserves where capital preservation matters more, cash ISAs remain useful despite real-terms erosion.

Can a cash ISA be used as security for a loan?

No. The ISA rules prohibit pledging an ISA as security for borrowing. Any arrangement that purports to do so could invalidate the tax wrapper and trigger HMRC action. A saver who needs to borrow against savings should use a separate non-ISA deposit or another asset class as security.