UK Lifetime ISA Calculator 2026/27 (LISA Bonus & Growth)

Calculate your UK Lifetime ISA (LISA) government bonus, projected growth until age 50 and 60, first home deposit timeline, and the 25% penalty cost of unauthorised withdrawals. Uses 2026/27 rules (£4,000/year cap, £1,000/year max bonus, £450,000 property price cap) — all runs in your browser, no data sent anywhere.

Annual bonus (this year)
Projected pot at age 50
Projected pot at age 60
Total bonus over lifetime
Deposit target
Years to deposit target
Year-by-year projection
Age Contribution Bonus Growth Balance
Penalty test & ISA comparison
Scenario After 10 years
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How the Lifetime ISA Works in 2026/27

The Lifetime ISA (LISA) is a UK savings account for adults aged 18 to 49 that pays a 25% government bonus on contributions, up to £1,000 per tax year. You can pay in up to £4,000 each tax year (this counts toward your overall £20,000 ISA allowance), and the bonus is paid directly into your LISA monthly by HMRC. Contributions stop at age 50, but your pot continues to grow until withdrawal. Funds can be used penalty-free for a first home under £450,000 or for retirement from age 60.

LISA Key Limits 2026/27

Age to open: 18–39

Age to contribute: 18–49 (contributions stop at 50th birthday)

Annual contribution cap: £4,000

Government bonus: 25% = up to £1,000/year

First home price cap: £450,000 (UK-wide)

Retirement access age: 60

Unauthorised withdrawal penalty: 25% of the amount withdrawn (effective 6.25% net loss)

Example: £4,000 contribution, 25% bonus

  • You pay in: £4,000
  • Government adds: £1,000 (25%)
  • Total in LISA: £5,000 before any investment growth
  • Bonus is paid monthly, typically 4–9 weeks after contribution

First Home Purchase With a LISA

To use LISA funds for a first home, you must be a first-time buyer, the property must cost £450,000 or less, you must buy with a mortgage, and the LISA must have been open for at least 12 months before completion. Your solicitor requests the funds directly from the LISA provider — you cannot withdraw the money yourself and then pay for the house. Most buyers use the LISA toward their deposit (typically 10%–20% of the price), meaning a £300,000 home with a 20% deposit needs £60,000 saved. Pairing maximum LISA contributions (£4,000/year + £1,000 bonus) with a partner's LISA can accelerate this timeline dramatically.

Example: £300,000 first home, 20% deposit needed

  • Deposit target: £60,000
  • Max LISA contribution: £4,000/year + £1,000 bonus = £5,000/year
  • Assuming 5% growth: deposit target hit in roughly 10 years from a £0 start
  • With a partner's LISA also maxed: roughly 5 years

LISA Withdrawal Penalty vs Cash ISA vs Stocks & Shares ISA

If you withdraw for any reason other than a qualifying first home, retirement at 60, or terminal illness, HMRC charges a 25% penalty on the amount withdrawn. Because the bonus was 25% on the way in but the penalty is 25% on the way out, the net effect is a 6.25% loss on your original contribution — not just the loss of the bonus. A £5,000 LISA balance (from £4,000 of your money plus £1,000 bonus) would return just £3,750 if withdrawn early. For savers who are uncertain whether they will buy a home or leave it until 60, a Stocks & Shares ISA or Cash ISA may offer more flexibility — no bonus, but no penalty either. The LISA's 25% bonus almost always beats a Cash ISA for house deposits if you definitely plan to buy, but the penalty risk matters for anyone whose plans could change.

Last updated: April 2026. Based on HMRC Lifetime ISA rules for the 2026/27 tax year. Always confirm current rules on GOV.UK before making financial decisions.