UK Mortgage Types Explained: Fixed, Tracker, Offset and How to Choose in 2026

Fixed-Rate Mortgages: Certainty at a Price

A fixed-rate mortgage charges a set interest rate for a defined initial period - typically two, three, five, or ten years. During this period, monthly payments are identical regardless of changes in the Bank of England base rate or market interest rates. At the end of the fixed period, the mortgage reverts to the lender's Standard Variable Rate (SVR) unless remortgaged to a new deal.

The SVR is typically 2% to 4% above the current best fixed or tracker rates and should be avoided. UK Finance data shows that approximately 800,000 residential mortgages reverted to SVR in 2024 when their fixed periods ended - representing a significant and avoidable overpayment that the mortgage market is structured to exploit unless borrowers actively remortgage.

Fixed-rate mortgages are priced to reflect the lender's cost of funds for the fixed period, which incorporates market expectations of future interest rates through the SONIA (Sterling Overnight Index Average) swap rate. When markets expect rates to fall significantly over the fixed period, fixed rates price in those expected cuts and may actually be higher than a tracker rate that follows the path of actual rate decisions. When markets expect rates to be stable or rise, fixed rates may offer a genuine cost saving over trackers over the period.

The two-year fix is the most commonly chosen term in the UK residential mortgage market. UK Finance data for 2025 showed 67% of new fixed-rate mortgages were fixed for two years. The preference for shorter fixes reflects borrowers wanting to benefit from expected rate decreases sooner. The five-year fix provides significantly more payment certainty and avoids remortgaging costs every two years - for borrowers who value stability or who have less capacity to manage a payment increase, the five-year fix is typically the appropriate choice.

Tracker Mortgages: Following the Base Rate

A tracker mortgage charges an interest rate set as a margin above the Bank of England base rate. A tracker at base rate plus 0.89% charged 5.14% when the base rate was 4.25% in June 2026. If the base rate falls to 3.75% over the next 12 months - in line with market expectations at the time of writing based on SONIA forward curves - the tracker rate falls to 4.64% automatically, with no remortgaging required.

Trackers are most advantageous when the base rate is expected to fall materially over the tracker period, or when the fixed-rate premium over the equivalent tracker is large enough that rate falls are already priced in. The Bank of England's Monetary Policy Committee communicates its rate decisions and forward guidance in published minutes after each meeting - these are publicly available at bankofengland.co.uk and provide the primary source of information about the rate trajectory that should inform the fixed versus tracker decision.

Trackers often have no early repayment charge during the tracker period, providing flexibility to remortgage to a fixed deal if rates rise unexpectedly. This optionality has a genuine value that is not captured in the headline rate comparison. A borrower on a tracker who believes rates will fall but wants the option to switch if they rise faces a different risk profile from a borrower locked into a five-year fix with a 3% ERC.

Offset Mortgages: Linking Savings to Your Mortgage

An offset mortgage links a savings account to the mortgage balance. Interest is charged only on the mortgage balance minus the savings balance - a borrower with a £200,000 mortgage and £30,000 in linked savings pays interest only on £170,000. The savings are not used to repay the mortgage but offset the balance for interest calculation purposes and remain fully accessible.

The effective return on savings held in an offset account is equal to the mortgage interest rate - currently 4.5% to 5.5% for most offset products. This compares favourably with easy-access savings rates of 4.5% to 4.75% AER available in June 2026, particularly for higher-rate taxpayers who would pay income tax on savings interest but receive no equivalent tax charge on the mortgage interest offset.

Offset mortgages are typically available only at higher interest rates than equivalent fixed or tracker deals. The rate premium is often 0.2% to 0.5% above comparable non-offset products. Whether the offset is worth this premium depends on the size of the savings balance relative to the mortgage: a borrower with £100,000 in savings against a £200,000 mortgage saves significantly more interest through offsetting than the premium costs. A borrower with £5,000 in savings against a £300,000 mortgage gains little from offsetting and pays the premium unnecessarily.

Early Repayment Charges: The Hidden Cost of Fixed Rates

Early repayment charges are fees levied by lenders when a fixed-rate mortgage is repaid or remortgaged before the end of the fixed period. They are typically structured as a percentage of the outstanding balance, declining over the fixed period: a five-year fix might carry ERCs of 5% in year one, 4% in year two, 3% in year three, 2% in year four, and 1% in year five.

On a £250,000 mortgage, a 5% ERC represents £12,500. On a £500,000 mortgage, it represents £25,000. These are not trivial costs and must be factored into any comparison of fixed-rate products. The effective cost of a fixed-rate mortgage includes not just the interest rate but the ERC profile, arrangement fees, and the cost of being unable to remortgage if a significantly better deal becomes available during the fixed period.

Mortgage overpayments within the annual overpayment limit - typically 10% of the outstanding balance per year - do not trigger ERCs. Making maximum annual overpayments reduces the balance on which ERCs are calculated if the mortgage is remortgaged early, and reduces total interest paid if held to term. FCA research shows that borrowers who overpay consistently save materially more in interest than those who make minimum payments, even at the same interest rate.

The Stress Test and Affordability Assessment

UK mortgage lenders conduct affordability assessments under FCA Mortgage Conduct of Business rules, which require lenders to assess whether a mortgage is affordable both at the contracted rate and at a stressed rate. The standard stress test adds 3 percentage points to the initial rate for affordability purposes - a mortgage offered at 4.5% is stress-tested at 7.5% to assess whether the borrower could continue to afford payments if rates rose to that level.

This stress test is the primary constraint on borrowing capacity for many UK buyers and explains why mortgage offers are sometimes significantly below the level that income multiples alone would suggest. Understanding the stress test framework before applying for a mortgage allows borrowers to structure applications to maximise the approved loan size - for example, by reducing other outstanding debts that increase the monthly commitment ratio used in affordability calculations.

Frequently Asked Questions

Should I fix my mortgage in 2026?

The decision depends on your view of the Bank of England base rate trajectory and your tolerance for payment uncertainty. With the base rate at 4.25% in June 2026 and market expectations of further cuts, trackers offer the possibility of automatic rate reductions without remortgaging costs. Fixed rates provide certainty but lock in a rate that may be above future tracker rates if cuts materialise. For borrowers who cannot absorb a payment increase, the fixed rate is the appropriate choice regardless of the rate outlook.

What is the standard variable rate and should I avoid it?

The SVR is the rate lenders charge when a fixed or tracker deal ends and the borrower does not remortgage. It is set by each lender and is typically 2% to 4% above the best available market rates. Remaining on SVR is almost always more expensive than remortgaging to a new deal. Setting a reminder to remortgage three to six months before the end of any fixed or tracker deal is essential.

What is an early repayment charge?

An ERC is a fee - typically 1% to 5% of the outstanding mortgage balance - charged when a fixed-rate mortgage is repaid or remortgaged before the end of the fixed period. On a £300,000 mortgage, a 3% ERC is £9,000. ERCs must be factored into any comparison of fixed-rate products and any decision to remortgage during a fixed period.

How does an offset mortgage work?

An offset mortgage links a savings account to the mortgage balance. Interest is calculated only on the mortgage balance minus the savings balance. A £200,000 mortgage with £40,000 in linked savings charges interest on £160,000. The savings remain accessible. The effective return on the savings equals the mortgage interest rate, which is particularly valuable for higher-rate taxpayers who would pay tax on savings interest in a standard account.