Lifetime ISA Calculator (UK)

What is a Lifetime ISA?

A Lifetime ISA (LISA) is an Individual Savings Account for buying your first home or saving for later life. You open it between 18 and 39, pay in up to £4,000 a tax year until you are 50, and the government adds a 25% bonus, up to £1,000 a year. It can hold cash or investments.

Use this Lifetime ISA calculator to estimate how your savings, plus the 25% government bonus, could grow over time. A Lifetime ISA (LISA) allows eligible UK savers aged 18–39 to contribute up to £4,000 per year, with the government adding a 25% bonus on contributions.

This LISA calculator helps you model how regular contributions, a lump sum and assumed growth rate may impact your estimated Lifetime ISA value, and what an early withdrawal would return after the government withdrawal charge (often called the Lifetime ISA penalty). LISAs can be used towards a first home purchase or accessed from age 60 for retirement.

If you’re comparing with other ISA types, explore our Cash ISA Calculator or Stocks & Shares ISA Calculator. For broader planning and side-by-side scenario modelling, use the Advanced ISA Planner.

New to ISAs? Visit our ISA Guides to understand allowance limits, withdrawal rules and tax treatment.

How to use the Lifetime ISA Calculator

Use this Lifetime ISA calculator to estimate how your savings could grow over time, including the government bonus. Enter your contributions, time horizon and assumed return to see estimated outcomes for first home or retirement planning.

1. Enter your contributions.
2. Choose time horizon & return.
3. Review your estimated LISA value.

How the Lifetime ISA calculator works

The calculator pays in your initial contribution, with its 25% bonus, at the start. It then adds each monthly contribution and its bonus at the end of the month, because the government bonus is claimed and paid monthly. Contributions are capped at £4,000 and the bonus at £1,000 in each tax year. Growth is the annual return you enter divided by 12 and compounded monthly, before charges and inflation.

Under "More options" you can add your age, so that payments and the bonus stop at 50, and a target home price, which is checked against the £450,000 first-home limit. The results also show what you would get back if you withdrew the estimated balance early and paid the 25% withdrawal charge, often called the Lifetime ISA penalty, so the page doubles as a LISA withdrawal penalty calculator.

Lifetime ISA rules for 2026-27

• You must be 18 or over to open a Lifetime ISA and make your first payment before you are 40. You can pay in until you are 50.
• You can pay in up to £4,000 a tax year, and this counts towards your £20,000 overall ISA allowance. You can only pay into one Lifetime ISA in a tax year (GOV.UK: how ISAs work).
• The government adds a 25% bonus, up to £1,000 a year. For example, paying in £4,000 earns a £1,000 bonus.
• You can use the money without a charge to buy your first home costing £450,000 or less, if your first payment was at least 12 months before; from age 60; if you are terminally ill; or on the death of the account holder, when the Lifetime ISA ends.
• Other withdrawals have a 25% charge (the withdrawal penalty) on the whole amount withdrawn, bonus included, so you can get back less than you paid in: £5,000 (£4,000 plus the bonus) withdrawn early would return £3,750 (GOV.UK: withdrawing from a Lifetime ISA).
• The government has consulted on a First Time Buyer ISA to replace the Lifetime ISA. No change has been confirmed, so this calculator uses the current Lifetime ISA rules (GOV.UK consultation).

ISA rules on this page are correct as of 26 September 2026. For every rule with its gov.uk source, see ISA rules at a glance.

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