ISA vs Pension Calculator — Compare Tax Benefits Side by Side
Compare ISA and pension as investment vehicles. See which gives better tax treatment for your income level and when you might want to use both.
ISAs and pensions are both tax-advantaged but work very differently. Pensions give tax relief on contributions (20-45% depending on your rate) but withdrawals are taxed as income (with 25% tax-free lump sum). ISAs are funded from after-tax income but all growth and withdrawals are completely tax-free forever. For higher-rate taxpayers pensions usually win. For basic-rate taxpayers the answer depends on your expected retirement income level.
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Key Information
| Parameter | Details |
|---|---|
| ISA Annual Allowance | £20000 |
| Pension Annual Allowance | £60000 |
| ISA Tax on Withdrawal | 0% (completely tax-free) |
| Pension Tax on Withdrawal | Income tax (after 25% tax-free) |
Compare ISA vs pension
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Use Calculator NowFrequently Asked Questions
Is ISA or pension better for retirement savings?
For a 40% taxpayer: £1000 gross pension contribution costs £600 after tax relief and grows to approximately £4000 over 25 years. Withdrawing at 20% retirement tax rate leaves £3250. Same £600 in ISA grows to approximately £2400 and is entirely tax-free. Pension wins by £850. For basic-rate taxpayers the advantage is smaller and ISA flexibility may outweigh the modest pension tax benefit.
Can I access my ISA before retirement?
Yes ISAs have no access restrictions — withdraw any amount at any time for any reason with zero tax or penalties. Pensions are locked until age 55 (rising to 57 in 2028). This makes ISAs superior for early retirement or financial flexibility. Many financial planners recommend building ISA savings to bridge the gap between early retirement and pension access age.
Should I max out ISA or pension first?
Strategy depends on your tax rate. Higher rate (40%+): maximize pension first for 40% tax relief then ISA. Basic rate (20%): consider splitting between both — pension for employer match and tax relief ISA for flexibility. If your employer matches pension contributions always contribute at least enough to get the full match before funding ISA — employer match is essentially 100% instant return.
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Last updated: March 2026