Pension or ISA? A pension adds tax relief but is usually locked until 55 (57 from April 2028); an ISA has no relief but can be drawn at any time.

Most people asking "pension or ISA" want to know which set of rules suits the money and the years they have left. Below are the rules for each as GOV.UK, HMRC and the law state them, with one worked example. There is no verdict here, because the answer turns on your tax rate now and later, whether an employer pays in, and when you may need the money. Should you want someone to run your own numbers, an FCA-authorised adviser will phone once you complete the short form on this page, with no fee for that conversation.

Pension or ISA at a glance

A stocks and shares ISA and a pension (workplace, personal or SIPP) can hold similar investments. The differences are in tax, in the age at which you can reach the money and in what happens on death.

Stocks and shares ISAPension
Paying inUp to £20,000 in the 2026/27 tax year, in one account or split across severalRelief on contributions up to 100% of your annual earnings, within a £60,000 annual allowance in 2026/27
Tax on the way inNothing added: you save from income already taxedRelief given: 20% added at source (more claimable at higher rates), or relief through pay under net pay
Tax on growthNo Income Tax or Capital Gains Tax on investment income or gainsTax is paid when money comes out
Employer moneyNone; saving is up to youWorkplace pensions include employer contributions
Reaching the moneyAt any time, keeping the tax benefitsUsually 55 at the earliest; 57 from 6 April 2028 for most people
Tax on the way outNoneUsually up to 25% tax-free (capped); the rest taxed as income
On deathCounts in the estate for Inheritance TaxBrought into Inheritance Tax for deaths on or after 6 April 2027, with exclusions

Neither wrapper protects the value of what sits inside it. GOV.UK says a personal pension's investments "can go up or down", and a stocks and shares ISA holds the same kinds of assets. The FCA's investor guidance says that, since an investment's value can fall, "returns aren’t always positive": sell for less than you paid and you have lost money. The rules below are the UK position for 2026/27, and Scottish Income Tax bands differ from the rates quoted.

Money going in: allowances, relief and employers

GOV.UK puts the ISA allowance at £20,000 for the 2026 to 2027 tax year. It covers all your ISAs together, so it can go into one account or be divided. You must be 18 or over to open one, and a stocks and shares ISA can hold shares in companies, investment funds and bonds, among other things. Nothing is added to what you pay in; the ISA's advantage is that income and gains inside it are not taxed and need not go on a tax return. A Lifetime ISA, with its £4,000 yearly limit and separate withdrawal rules, is compared with a pension in the Lifetime ISA or pension guide.

A pension has two ceilings. Relief is given on contributions of up to 100% of your earnings in a year, and the 2026/27 annual allowance of £60,000 takes in your employer's payments as well as your own; some people have a smaller allowance, explained in the annual allowance guide. Only schemes registered with HMRC qualify. Relief then reaches you in one of two ways:

  • Relief at source, which GOV.UK says applies in all personal and stakeholder pensions and some workplace ones. The provider adds basic-rate relief of 20% to your pot. A higher or additional rate taxpayer claims the rest through Self Assessment: 20% on income taxed at 40%, and 25% on income taxed at the 45% rate (England, Wales and Northern Ireland rates). With no earnings at all, 20% can still be added on up to £2,880 a year.
  • Net pay, where the employer deducts your contribution before working out Income Tax. HMRC's Pensions Tax Manual, at PTM044230, says this gives "full relief at the marginal tax rate".

Scottish rates and how to claim are in the pension tax relief guide. In a workplace pension the employer pays in too: GOV.UK's illustration has £80 reaching the pot on a payday, made up of £40 from the employee, £30 from the employer and £10 of relief, though real splits depend on the scheme and joining lowers take-home pay. An ISA has no equivalent. Whether a workplace pension is worth staying in is a separate guide.

The cash ISA limit from 6 April 2027

The Individual Savings Account (Amendment) (No. 2) Regulations 2026 were made on 10 September 2026 and come into force on 6 April 2027. From then, in any tax year at the end of which you are 64 or under, no more than £12,000 of your subscriptions can go into cash ISAs. The overall limit stays at £20,000, and HM Treasury's note of 17 September 2026 confirms that people aged 65 or over keep a £20,000 cash ISA limit. That note also describes rules touching stocks and shares ISAs, including restrictions on moving money from them into cash ISAs and a 22% charge on interest paid on cash held inside them.

Money coming out: the age and the tax

An ISA has no access age. GOV.UK says you can withdraw "at any time, without losing any tax benefits", although a provider's terms may set rules or charges for withdrawals, and a "flexible" ISA lets you replace cash taken out within the same tax year without using more allowance.

A pension makes you wait. GOV.UK says the age "depends on your pension scheme’s rules", with 55 the usual earliest. Behind that sits the normal minimum pension age, which an HM Treasury and HMRC note says rises from 55 to 57 on and after 6 April 2028. The same note keeps exceptions: savers "retiring due to ill-health", members of the firefighters, police and armed forces public service schemes, and people with a protected pension age. Outside those cases, money taken before the minimum age risks an unauthorised payments tax charge. The access-age guide covers each case.

Once a pension can be drawn, up to 25% can usually come out tax-free, to a maximum of £268,275 (the lump sum allowance); lump sums beyond your allowances are taxed. The rest counts as income, taxed once your total taxable income passes the Personal Allowance, usually £12,570, and GOV.UK warns that a large withdrawal can be taxed at a higher rate. The tax-free lump sum guide and the guides to drawdown and annuities cover the choices for the remainder, and Pension Wise, the free government-backed guidance service, can talk them through.

A worked example: £1,000 of pay, saved each way

This is the site's own arithmetic, dated 20 October 2026, with the working in the sources file. It shows how tax on the way in and tax on the way out interact, under these assumptions:

  • £1,000 of pay before Income Tax goes either into a stocks and shares ISA, after tax, or into a pension using relief at source;
  • Income Tax at the 2026/27 rates for England, Wales and Northern Ireland: 20% basic rate, 40% higher rate;
  • a higher-rate saver claims the extra 20% back through Self Assessment, so the saving costs them £600, while the pot holds £1,000 either way;
  • the whole pension is taken at once, 25% tax-free and the other 75% taxed at a single rate of 20% or 40%;
  • no investment growth, charges, National Insurance or employer money, and the Personal Allowance and lump sum allowance are left out.
Tax rate on the pay when savedISA: paid in and taken outPension potPension taken out, taxed at 20%Pension taken out, taxed at 40%
20% (basic rate)£800£1,000£850£700
40% (higher rate)£600£1,000£850£700

Set against each other, the four cases come out like this: saved at 20% and taxed at 20% on the way out, £850 from the pension against £800 from the ISA; saved at 20% and taxed at 40%, £700 against £800; saved at 40% and taxed at 20%, £850 against £600; saved at 40% and taxed at 40%, £700 against £600. The ISA figure depends only on the tax paid when the money was earned, the pension figure only on the tax paid when it comes out. Real outcomes also depend on growth, charges, employer contributions, the allowances and your whole income in the year you draw the money; someone whose retirement income sits under the Personal Allowance could pay no tax on some or all of the taxable part. This is arithmetic under stated assumptions, not a forecast or a recommendation.

Lining up your own pots, tax band and State Pension against a grid like this needs your real figures in front of someone qualified. A phone call in which an FCA-authorised adviser goes through them is one way to get there: complete the form on this page whenever it suits and that call is arranged, free.

Inheritance Tax and the wider picture

The ISA position is plain on GOV.UK: no Income Tax or Capital Gains Tax is due up to the date the account closes after death, but "ISA investments will form part of your estate for Inheritance Tax purposes".

For pensions the law has changed, from 6 April 2027. Section 66 of the Finance Act 2026 (Royal Assent 18 March 2026) adds section 150A to the Inheritance Tax Act 1984. It treats a member of a registered pension scheme as owning, just before death, property worked out from their pension arrangements, which the Act calls "notional pension property". Under section 71 the change covers deaths on or after 6 April 2027, and the Act leaves out certain benefits, a dependants' scheme pension among them. For deaths from that date, then, an ISA and an unused pension (other than excluded benefits) both enter the Inheritance Tax calculation. Whether tax is actually due depends on the size of the estate and who inherits, and Income Tax on an inherited pension is a separate question; pensions and Inheritance Tax and pension death benefits carry the detail.

Some things outside the tax rules can matter as much. Charges vary by provider and product (see pension charges); a SIPP widens what a pension can hold, and a personal pension is the usual route for someone without a workplace scheme. The State Pension and any workplace pension are the base the choice sits on, and how much retirement income you will need is its own question.

Common questions about pensions and ISAs

Can I use an ISA as a pension?

An ISA is not a pension, but money in one can pay for retirement, since it can be withdrawn at any time without losing its tax benefits. It has no minimum access age, no employer contributions and no tax relief on the way in. Many people hold both, and each has its own yearly limit.

Is a SIPP better than a stocks and shares ISA?

A SIPP is a pension, so the pension rules above apply: relief on the way in, the access age, the tax-free 25% and Income Tax on the rest. A stocks and shares ISA follows the ISA rules. The worked example shows why the comparison comes out differently for different people.

Should I choose a pension or an ISA in my fifties or sixties?

Age matters mainly for access. A pension usually cannot be drawn before 55, or 57 for most people from 6 April 2028, whereas an ISA can be drawn at any time, so the date you may need the money is a fact to weigh. Starting a pension in your fifties or sixties covers the rest.

Which is better for tax, a pension or an ISA?

They tax different stages: a pension gives relief going in and taxes most of what comes out, while an ISA gives no relief going in and taxes nothing coming out. Which ends up ahead depends on your tax rate at each end.

Pension or ISA if I am self-employed?

The same rules apply, but usually nobody else pays into the pension, and extra relief above the basic rate is claimed through Self Assessment. Pensions for the self-employed sets out the options.

Before you decide

Either account can be opened directly with a provider, and Pension Wise offers free guidance as you near taking a pension. If the choice hangs on your tax position, your other pensions or what you hope to leave, talking it over with an FCA-authorised adviser may help, and pension-versus-ISA questions are fair to raise once the form on this page brings that call, which is free.

Sources