Lifetime ISA Calculator UK 2026/27 – First-Time Buyer LISA Bonus

Updated 5 October 2026: Estimate how your Lifetime ISA (LISA) could grow for a first-home deposit using your planned contributions, the 25% government bonus and an optional growth-rate assumption. The calculator applies the £4,000 annual LISA contribution limit and £1,000 maximum annual bonus.

🏡 Lifetime ISA First-Home Calculator

Model contributions, the government bonus and possible account growth.

There is no £333 statutory monthly limit. You can contribute flexibly, but eligible LISA subscriptions are capped at £4,000 per tax year.
Cash LISA interest can change. Stocks & shares LISA values can fall as well as rise. This is only an assumption.
Assumed already inside the LISA; we do not add another government bonus to this existing balance.
New contributions£0
Government bonuses£0
Modelled growth£0
Unused contribution capacity£0
Projected LISA balance
£0
Bonus timing: this projection estimates bonus growth by adding 25% alongside each monthly contribution. In real life, your provider claims bonuses from HMRC based on claim periods and the exact date money reaches your account varies. Treat the growth figure as an illustration, not an exact forecast.
25% withdrawal charge: an unauthorised withdrawal is charged at 25% of the amount withdrawn, including the bonus. That can leave you with less than you originally contributed. For example, £800 contributed + £200 bonus = £1,000; a 25% charge leaves £750, before considering growth.
Official sourcesGOV.UK Lifetime ISA overview →LISA withdrawal and first-home rules →HMRC first-home withdrawal guidance →
Important: This is an educational projection, not savings, investment, mortgage or tax advice. It does not test every LISA eligibility condition. Provider charges and investment fees are excluded.

Rules checked: 5 October 2026 • 2026/27 LISA contribution limit £4,000 • maximum government bonus £1,000

How does a Lifetime ISA work in 2026/27?

You can pay up to £4,000 into a Lifetime ISA each tax year and the government adds a 25% bonus, giving a maximum £1,000 bonus on a full £4,000 eligible contribution. The £4,000 LISA limit forms part of the overall £20,000 ISA allowance for 2026/27.

Is £333.33 the monthly LISA limit?

No. £333.33 is simply £4,000 divided by 12. The legal limit is annual rather than a fixed monthly contribution ceiling. Depending on your provider’s terms, you can contribute in different patterns during the tax year, provided your eligible LISA subscriptions do not exceed £4,000 for that tax year.

What age can I open and pay into a LISA?

You must make your first LISA payment before you turn 40. You can continue paying into the account and receiving the 25% bonus until age 50. After 50 you cannot make further LISA contributions or earn new government bonuses, although the account can remain open and continue earning interest or investment returns.

When can I use a LISA for my first home?

For a charge-free first-home withdrawal, the property must cost £450,000 or less and generally be in the UK, you must be a first-time buyer, intend to live there as your main residence, buy with a qualifying mortgage and use an eligible conveyancer. At least 12 months must have passed since your first payment into the LISA.

Can two first-time buyers both use LISAs?

Yes. If two people buying together each have a LISA and each satisfies the first-time buyer conditions, both can use their LISA savings and government bonuses towards the same qualifying property. You can also buy jointly with someone who is not a first-time buyer while using your own LISA, provided you personally meet the conditions.

What happens if I withdraw LISA money for another reason?

Unless an authorised withdrawal condition applies, a 25% withdrawal charge normally applies. Because the charge is applied to the amount withdrawn after the government bonus has been added, it can take back the bonus and some of your original contribution. Charge-free withdrawals are available for a qualifying first-home purchase, from age 60, and in specified terminal-illness circumstances.

Cash LISA or Stocks and Shares LISA?

A LISA can hold cash or stocks and shares. Cash interest rates may change. Investments can rise or fall and may be unsuitable for money needed on a short timetable. This calculator therefore lets you enter an illustrative growth rate but does not recommend which type of LISA to choose.

Stamp Duty Calculator — check the SDLT side of a first-home purchase.

Important information

The projection simplifies tax-year timing by modelling full 12-month years from today. Actual LISA allowances reset on 6 April, so your real contribution capacity before a planned purchase depends on calendar dates as well as the number of months you save. Confirm the current rules and your provider’s terms before contributing or arranging a house-purchase withdrawal.