Term life insurance is the dominant form of life cover sold in the UK, accounting for the majority of new individual protection policies written each year according to ABI data. The word "term" refers to the fixed period for which the policy provides cover: if the insured person dies during the term, the policy pays the sum assured; if they survive to the end of the term, the policy expires with no payout and no cash value. This straightforward structure makes term assurance the most cost-efficient way to provide a large lump sum during the years of maximum financial exposure, typically when a mortgage is outstanding and children are financially dependent. This guide covers what term life insurance is, the three sub-types available in the UK market, how it differs from whole-of-life, how to choose the right policy length, what happens at expiry, and how premiums are calculated.

What term life insurance is and why "term" matters

The defining characteristic of term life insurance is the policy term: a defined period, agreed at inception, during which the insurer provides cover. Outside this period, no cover exists. A 25-year term policy taken at age 35 provides cover until age 60. Death at age 61 is not covered, regardless of the premiums paid during the 25-year term.

This expiry mechanism is the primary structural feature that distinguishes term assurance from whole-of-life insurance, and it is the source of both term assurance's lower cost and its principal limitation. Because a significant proportion of term policies will expire without a claim (most policyholders taking out 25-year term policies in their 30s will survive the term), the insurer prices the risk as a probability rather than a certainty. The premium reflects the actuarial probability of death during the specified term, not the certainty of eventual death that underpins whole-of-life pricing.

The practical consequence is that term assurance premiums are substantially lower than whole-of-life premiums for the same sum assured, making it possible to purchase a large sum assured at a relatively modest monthly cost during the years when financial protection is most needed. A 35-year-old non-smoker in standard health can access £250,000 of cover for a 25-year term at approximately £12 to £20 per month. The same sum assured on a whole-of-life basis would typically cost £60 to £100 per month or more.

The term matters because it must be matched to the financial obligation being protected. A policy term that is shorter than the financial exposure it is intended to cover leaves a gap during which the family is unprotected. Choosing the term correctly is one of the most consequential decisions in structuring a life insurance arrangement, and it is covered in detail below. Our life insurance hub provides a full overview of how term products fit within the broader UK protection landscape.

The three types of term assurance: level, decreasing, increasing

The UK market offers three distinct term assurance structures, each calibrated to a different financial need. The correct choice depends on whether the financial obligation being protected remains constant, declines or grows over the policy term.

Level term assurance maintains a fixed sum assured throughout the policy term. A £300,000 level term policy pays £300,000 whether death occurs in year one or year 24. This structure is appropriate for income replacement needs, interest-only mortgage protection, and any financial obligation that does not diminish over time. The fixed sum assured provides certainty and simplicity. Premiums are fixed for the duration.

Decreasing term assurance has a sum assured that reduces progressively throughout the term, typically tracking the outstanding balance on a capital repayment mortgage. As the mortgage is repaid and the outstanding balance falls, the sum at risk to the insurer falls correspondingly, which is reflected in a lower premium than equivalent level term. Decreasing term is the appropriate product when the sole financial need is clearing a repayment mortgage balance, and when that balance genuinely declines in line with the policy's reduction schedule. It is not appropriate for interest-only mortgages or income replacement needs.

Increasing term assurance has a sum assured that rises over the policy term, typically linked to the Retail Prices Index (RPI) or a fixed annual percentage such as 3 or 5 percent. The purpose is to protect the real value of the sum assured against inflation over a long policy term. A £200,000 sum assured that does not change over 25 years will have materially lower purchasing power at year 25 than at year one in an inflationary environment. Increasing term addresses this, but at a higher premium than level term for the same initial sum assured. Premiums also increase over the term in line with the sum assured escalation.

Term versus whole-of-life: structural differences

Term assurance and whole-of-life insurance are the two fundamental categories of UK life insurance, and the choice between them is determined by whether the financial need being protected has a defined end date or persists indefinitely.

Term assurance is appropriate for time-limited financial needs: a mortgage with a defined repayment date, income replacement while children are financially dependent (a need that ends when they reach independence), and key person cover for a business where the financial exposure is linked to the individual's working years. These needs have natural end dates, and a policy that expires at or around those dates provides the required protection at the lowest available premium.

Whole-of-life is appropriate for needs with no expiry: inheritance tax planning (the IHT liability is due whenever death occurs, at any age), guaranteed estate liquidity provision, and business continuity arrangements requiring a guaranteed payout at any point in a partner's lifetime. The certainty of eventual payout in a whole-of-life policy is the feature that justifies its significantly higher premium. Paying a premium three to four times higher than term assurance for the same sum assured is only rational when the financial need itself has no expiry date.

A common structural error in UK life insurance planning is using whole-of-life for a time-limited need (such as mortgage protection) because the guaranteed payout sounds more reassuring than a policy that might expire without paying out. The certainty premium embedded in whole-of-life pricing is an avoidable cost for time-limited needs. Our guide to whole-of-life insurance covers that product's appropriate use cases in detail.

Choosing the right policy length

The policy term should be determined by the longest financial obligation being protected, not by cost preference or round numbers. The most common structuring error in UK life insurance is choosing a term that is shorter than the financial exposure, leaving a coverage gap during the unprotected years.

A household with a 25-year repayment mortgage and dependent children who will be financially independent in 18 years has two overlapping financial needs: mortgage protection for 25 years and income replacement for 18 years. The term should be set at 25 years to cover the longer obligation. Choosing an 18-year term to match the income replacement need leaves seven years of mortgage exposure unprotected.

The typical approach is to identify all financial obligations that would be materially affected by the policyholder's death, determine the end date of each, and set the policy term to match the latest of those end dates. If this produces a very long term (30 years or more), the additional premium cost of the extended term should be evaluated against the risk of leaving the later years unprotected.

Age constraints also apply: most UK insurers will not write term assurance beyond age 70 to 85 at the end of the term, with the maximum age at expiry varying by insurer. A 50-year-old seeking a 30-year term would have a policy expiring at age 80, which is within most insurer maximum expiry age guidelines, but a 55-year-old seeking the same 30-year term may find fewer insurers willing to write to age 85.

What happens when the term ends

When a term assurance policy reaches its expiry date and the policyholder is alive, the policy terminates. No payout is made, no cash value is returned, and the insurer has no further obligation. The total premiums paid during the term represent the cost of the insurance cover provided during that period. This is not a loss in the economic sense; it is the expected outcome for the majority of policyholders and the reason term assurance premiums are affordable.

At policy expiry, the policyholder has several options depending on their circumstances at that point. If the financial obligations that drove the original purchase have also expired (mortgage repaid, children financially independent, pension providing income security), no further life insurance may be required. If financial obligations remain, a new policy can be applied for, subject to the applicant's health at the time of the new application.

The critical consideration at term expiry is that a new policy application is subject to full underwriting at the applicant's current age and health profile. A 60-year-old applying for a new policy will face higher premiums than a 35-year-old. Any health conditions that developed during the original policy term will be assessed and may attract loadings or exclusions. The guarantee of insurability that existed at original policy inception does not carry forward. This is the risk of relying on a single term policy with the intention of renewing at expiry.

Some term policies include a guaranteed insurability option (also called a guaranteed increase option or conversion option) that allows the policyholder to extend the term or convert to a whole-of-life policy at expiry without further medical underwriting. This feature is valuable and worth confirming at the point of purchase if future insurability is a concern.

Term life insurance and mortgage protection

Mortgage protection is the most common purchase rationale for term life insurance in the UK. The financial logic is straightforward: a mortgage is a large secured debt obligation that must be serviced from household income; if the primary earner dies during the mortgage term, the surviving household may be unable to service the debt without the deceased's income; a life insurance payout clears the mortgage and removes the debt obligation.

The choice between level term and decreasing term for mortgage protection depends on the mortgage type. For a repayment (capital and interest) mortgage, the outstanding balance falls each year as capital is repaid. Decreasing term, with its falling sum assured, matches this declining balance efficiently and at lower premium than level term. For an interest-only mortgage, the outstanding balance remains constant throughout the term, requiring level term cover to maintain equivalent protection throughout.

Mortgage protection policies are frequently sold at the point of mortgage application, either by the lender or a tied distributor. The FCA's Consumer Duty rules require that any protection product sold in this context demonstrates fair value and is genuinely appropriate to the customer's needs. Comparing the lender's offered product against the wider market before accepting any tied product is advisable. Our detailed guide to life insurance for mortgage protection covers the selection framework comprehensively.

How term life insurance is priced

Term life insurance premiums are determined by five primary factors at the point of underwriting: age at application, smoker status, health and BMI, sum assured, and policy term. Each factor contributes to the insurer's actuarial assessment of the probability that the policy will result in a claim during the term.

Age is the single most influential factor. Mortality probability increases with age, which is reflected directly in premiums. A 10-year age difference between two otherwise identical applicants typically produces a 50 to 100 percent premium differential for the same cover.

Smoker status adds approximately 1.5 to 2 times the non-smoker premium. The definition of smoker is consistent across most UK insurers: any tobacco product use, including e-cigarettes in most insurer definitions, within the previous 12 months.

Health and BMI affect the premium through the underwriting loading mechanism. Standard health produces a standard premium. Disclosed conditions, elevated BMI, family history factors and hazardous occupations attract loadings that vary by insurer and by the specific clinical detail of the disclosed risk.

Sum assured scales the premium broadly proportionally, with modest sub-proportional scaling at larger amounts due to the fixed administrative cost component. Higher sum assured amounts typically trigger more intensive underwriting requirements including GP reports or medical examinations.

Policy term increases the premium because a longer term means a higher cumulative probability of a claim during the covered period. A 30-year term policy costs more than a 20-year term policy for the same sum assured and applicant profile, but less than two consecutive 15-year policies purchased separately.

Sources and verification

• ABI UK Insurance and Long-Term Savings Key Facts 2025: https://www.abi.org.uk/data-and-research/reports-and-publications/uk-insurance-and-long-term-savings-key-facts/
• FCA Insurance Conduct of Business Sourcebook (ICOBS): https://www.handbook.fca.org.uk/handbook/ICOBS/
• FCA Consumer Duty Final Rules PS22/9: https://www.fca.org.uk/publications/policy-statements/ps22-9-new-consumer-duty
• ONS National Life Tables UK (mortality data): https://www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/lifeexpectancies/datasets/nationallifetablesunitedkingdomreferencetables
• MoneyHelper Term Life Insurance Guide: https://www.moneyhelper.org.uk/en/insurance/life-insurance/term-life-insurance
• Financial Ombudsman Service Life Insurance Decisions: https://www.financial-ombudsman.org.uk/decisions-case-studies/ombudsman-news/insurance

This article is for informational purposes only and does not constitute financial advice. Always verify rates with official sources before making any financial decision.

Frequently asked questions

What is term life insurance?

Term life insurance is a policy that pays a lump sum on the death of the insured person during a defined policy term. If death does not occur during the term, the policy expires with no payout and no cash value. The term is agreed at inception and premiums are typically fixed for its duration. It is the most widely purchased form of life insurance in the UK because it provides a large sum assured at a lower premium than permanent cover. The three main sub-types are level term (fixed sum assured), decreasing term (falling sum assured, used for repayment mortgage protection), and increasing term (rising sum assured, used for inflation protection).

How long should a term life insurance policy be?

The term should match the longest financial obligation being protected. Identify all financial needs that would be materially affected by your death: the mortgage repayment date, the age at which your youngest dependent child will be financially independent, any business obligation with a defined duration. The policy term should equal the latest of these end dates. Choosing a shorter term to reduce premiums leaves a coverage gap during the unprotected years. Most UK insurers write terms to a maximum expiry age of 70 to 85, which limits the available term for older applicants regardless of financial need.

What happens if I outlive my term life insurance?

If you are alive at the policy expiry date, the policy terminates. No payout is made and no cash value is returned. The premiums paid represent the cost of cover during the term. At expiry, you can apply for a new policy, subject to full underwriting at your then-current age and health profile. If your financial obligations have also ended by that point (mortgage repaid, dependants independent), no replacement cover may be necessary. If cover is still required, some policies include a guaranteed insurability option allowing renewal or conversion without fresh medical underwriting. This feature is worth confirming at inception if future insurability is a concern.

Is term life insurance cheaper than whole-of-life?

Yes, materially so for the same sum assured. Term assurance is priced as a probability that death will occur during the defined term; whole-of-life is priced as a certainty of eventual payout. A 35-year-old buying £200,000 of level term cover over 25 years might pay £12 to £20 per month. Equivalent whole-of-life cover would typically cost £50 to £100 per month or more. The premium difference reflects the fundamental actuarial difference between a contingent payout and a guaranteed one. Term is the cost-efficient choice for time-limited financial needs; whole-of-life is justified only where the financial need itself has no expiry date.

Can I extend a term life insurance policy?

Extending an existing term policy, in the sense of lengthening its remaining term, is not generally possible mid-policy with most UK insurers. The options at the end of a term are typically: apply for a new policy subject to fresh underwriting at current age and health; convert to a whole-of-life policy if the original policy included a conversion option; or allow the policy to expire if the financial need it was covering has also ended. A guaranteed insurability or conversion option within the original policy is the mechanism that allows cover to continue without fresh medical underwriting. These options are not universal and should be confirmed in the policy terms before purchase.