LISA 12-Month Maturation Trap & Penalty Guide 2026
Bottom Line
Opening a Lifetime ISA even 1 day late can cost you £250–£750 in penalties when you are forced to withdraw because your 12-month maturation has not completed before your house purchase completes. The 25% withdrawal charge does not just claw back the government bonus — it takes 6.25% of your own money too. Open your LISA now, deposit even £1, and start the clock — even if you are not ready to buy for another two years.
The 12-Month Maturation Rule Explained
The Lifetime ISA has a rule that catches out thousands of first-time buyers every year: you must have made your first LISA payment at least 12 months before your property purchase completes. Not 12 months before you make an offer. Not 12 months before exchange. Twelve months before completion — the day you get the keys.
If your completion happens before that 12-month maturation period has passed, you have two options, and both are bad:
If your LISA hasn't matured:
- Option A: You cannot use the LISA funds for this purchase. Your solicitor cannot request the money from your LISA provider.
- Option B: You withdraw the money and pay the 25% penalty on everything — your contributions, the government bonus, and any interest earned.
The critical detail: the 12-month maturation clock starts from the date of your first ever payment into any LISA — not the date you open the account. Opening a LISA without depositing does not start the clock. Even a £1 deposit starts it, but you must actually make that payment. You only need to start the clock once — it carries across all LISAs you hold. This is why the single most important thing a potential first-time buyer can do is open a LISA and make a payment today, even if they are years away from buying.
Source: GOV.UK Lifetime ISA withdrawal rules; OneFamily LISA terms and conditions
How the 25% Penalty Really Works
The LISA penalty sounds like it simply takes back the 25% bonus. It does not. The maths is worse than most people realise.
Here is how it works, step by step:
- You contribute money to your LISA (up to £4,000 per tax year).
- The government adds a 25% bonus on your contributions. On £4,000, that is £1,000.
- Your total pot is now £5,000 (your £4,000 + £1,000 bonus).
- The 25% withdrawal penalty is charged on the total pot — not just your contributions.
- 25% of £5,000 = £1,250.
- You get back £5,000 − £1,250 = £3,750.
- You put in £4,000. You got back £3,750. Net loss: £250 of your own money.
The maths behind 6.25%
The government bonus (25% of your contribution) makes up exactly 20% of the total pot. When you take 25% off the total pot, you lose the entire bonus plus 5% of the total — which equals 6.25% of your own contribution. That is £62.50 per £1,000 you saved. This is not theoretical — it is hard cash you lose.
Penalty Proof
Principal: £1,000 (your savings)
Government Bonus (25%): +£250
Total LISA Pot: £1,250
25% Withdrawal Penalty: −£312.50
Net Return to You: £937.50
Loss on your original savings: −£62.50 (6.25%)You put in £1,000 of your own money. You get back £937.50. The government bonus is gone and you lose £62.50 on top. This 6.25% penalty applies at every savings level.
For a deeper walkthrough of the penalty calculation, see our deep dive on the 6.25% penalty.
Penalty Impact at Three Savings Levels
The table below shows exactly what happens at three common savings levels. These are the figures every LISA holder needs to know before making a withdrawal decision.
| Your Contribution | Govt Bonus (25%) | Total Pot | 25% Penalty | You Receive | Net Loss on YOUR Money |
|---|---|---|---|---|---|
| £1,000 | £250 | £1,250 | £312.50 | £937.50 | £62.50 (6.25%) |
| £4,000 | £1,000 | £5,000 | £1,250 | £3,750 | £250 (6.25%) |
| £12,000 (3 years max) | £3,000 | £15,000 | £3,750 | £11,250 | £750 (6.25%) |
Source: GOV.UK LISA withdrawal rules; Tembo Money LISA penalty calculations
The net loss percentage is always 6.25% — regardless of how much you have saved. The more you have contributed, the larger the absolute amount you stand to lose.
Not sure if a LISA is right for you?
Our free tools help you compare savings options for your first home.
Open the Calculator ToolsCritical Timeline: When to Open Your LISA
The average house purchase takes 12–16 weeks from offer accepted to completion. Combined with the 12-month maturation rule, you need your LISA open at least 15–16 months before you want to complete on a property. Here is the timeline:
| Timeline | Event | Status |
|---|---|---|
| Day 0 | Open LISA, make first payment (even £1) | Clock starts |
| Day 1–365 | Maturation period — CANNOT use for property | Locked |
| Day 366+ | Eligible for first-time buyer withdrawal | Unlocked |
| Offer accepted | Start conveyancing process | 12–16 weeks to completion |
| Completion day | LISA must have been open 12+ months by this date | Pass/fail moment |
The trap
If you open a LISA in March 2026 and find a property in October 2026, your offer might be accepted in November and completion scheduled for February 2027 — just 11 months after you opened the LISA. You would be one month short and unable to use the LISA for the purchase. If you withdraw to cover the deposit shortfall, you pay the 25% penalty.
The real advice: open your LISA now and deposit even £1. Do this even if you are not planning to buy for another 2–3 years. It costs nothing to start the clock, and it could save you hundreds of pounds.
Cash LISA vs Easy Access ISA Rates (March 2026)
One common question is whether you are better off putting your savings in a regular ISA instead of a LISA. The answer depends entirely on whether you will use the LISA for a qualifying purchase.
| Account Type | Provider | AER |
|---|---|---|
| Best Cash LISA | Top provider | 4.60% |
| Cash LISA | Tembo | 4.50% |
| Typical Cash LISA | Market range | 3.50–4.60% |
| Best Easy Access ISA | Trading 212 | 4.68% |
| Easy Access ISA | Plum | 4.66% |
| Easy Access ISA | Moneybox | 4.26% |
| Average Easy Access ISA | Market average | 2.62% |
| Best 1-Year Fixed ISA | Top provider | 4.22–4.25% |
Source: Moneyfacts, February/March 2026. Rates change daily — check providers for current offers.
Key insight
The best easy access ISAs (4.68%) now pay slightly more interest than the best Cash LISAs (4.60%). But the 25% government bonus on the LISA dwarfs any interest rate difference. On £4,000 of contributions, the LISA bonus is £1,000 — an effective 25% immediate return. No ISA interest rate comes close to matching that, as long as you use the LISA for a qualifying purchase under £450,000.
The £450,000 Price Cap Trap
The Lifetime ISA can only be used for properties costing up to £450,000. This cap has been frozen since the LISA launched in 2017 — nearly a decade without adjustment.
Market Context (Dec 2025)
| Metric | Price | vs £450k LISA Cap |
|---|---|---|
| UK Average Property Price | £270,000 | £180,000 under cap |
| London FTB Average | £471,000 | £21,000 over cap |
| LISA Property Price Cap | £450,000 | Frozen since 2017 |
Sources: ONS UK House Price Index, Dec 2025; HM Land Registry, Dec 2025
While the UK average remains well within the £450,000 LISA limit, London first-time buyers face a systemic trap as average prices now exceed the cap by £21,000.
If your property exceeds £450,000, you cannot use the LISA bonus. You must either leave the money in the LISA until age 60, or withdraw and pay the 25% penalty — losing the bonus and 6.25% of your own savings.
London buyers beware
The average London first-time buyer property now costs £471,000 — exceeding the LISA cap by £21,000. If you are buying in London or the South East, carefully check that your target property type and area falls under £450,000 before committing to a LISA. Martin Lewis and others have been campaigning to raise or remove this cap since 2025.
For a full overview of all government schemes available to first-time buyers, including alternatives to the LISA, see our Government Schemes for First-Time Buyers 2026 guide.
Frequently Asked Questions
Can I use my LISA within 12 months?
No. Your first payment into any Lifetime ISA must be at least 12 months old at the date of completion (not exchange). If your property completes before the 12-month maturation period ends, you cannot use your LISA for that purchase. If you withdraw early, you pay a 25% penalty on the entire balance including the government bonus.
How is the LISA penalty calculated?
The LISA withdrawal penalty is 25% of the total withdrawal amount — that includes your contributions, the government bonus, and any interest earned. Because the 25% bonus makes up 20% of your total pot, the 25% penalty claws back the entire bonus plus 6.25% of your own money. On £4,000 of savings with a £1,000 bonus (£5,000 total), the penalty is £1,250 — leaving you with just £3,750.
When does the LISA 12-month clock start?
The 12-month maturation clock starts from the date of your first ever payment into any Lifetime ISA. Even a £1 deposit starts the clock. The clock only needs to be started once — it applies across all LISAs you hold.
What is the LISA property price cap?
The Lifetime ISA can only be used for properties costing up to £450,000. This cap has been frozen since 2017. If your property exceeds £450,000, you cannot use your LISA bonus and will face the 25% withdrawal penalty if you take the money out.
Is a Cash LISA better than an easy access ISA?
For first-time buyers purchasing under £450,000, a Cash LISA is significantly better thanks to the 25% government bonus. The best Cash LISA rates are around 4.60% AER, while the best easy access ISAs pay up to 4.68% AER. However, the £1,000 annual bonus on £4,000 of LISA contributions dwarfs any interest rate difference. If you cannot meet the LISA conditions, a standard ISA avoids the penalty risk.
What happens to my LISA if I buy a property over £450,000?
If you buy a property over £450,000, you cannot use the LISA bonus for that purchase. You will need to either leave the money in the LISA until age 60 or withdraw it and pay the 25% penalty — losing the entire government bonus plus 6.25% of your own contributions.
Can I transfer my Help to Buy ISA to a LISA?
You can transfer a Help to Buy ISA to a LISA, but the transferred amount counts towards your £4,000 annual LISA contribution limit. Help to Buy ISAs closed to new applicants in November 2019, though existing holders can contribute until November 2029. You cannot use both a Help to Buy ISA bonus and a LISA bonus for the same property purchase.
Ready to Plan Your First Home Purchase?
Our free tools help you calculate stamp duty, mortgage repayments, and the true cost of buying your first home.
Open the Calculator Tools