The Lifetime ISA sounds like free money, and for a lot of people it is. Pay in up to £4,000 a year, the government tops it up by 25%, and you walk away with an extra £1,000 for nothing. For a first-time buyer scraping a deposit together, that bonus is genuinely worth chasing. But there is a trap built into the small print that has caught thousands of savers off guard, and in mid-2026 it is biting harder than ever: the £450,000 property price cap.
How the Lifetime ISA actually works
You can open a LISA between the ages of 18 and 39, and pay in until you turn 50. The annual limit is £4,000, which counts towards your overall £20,000 ISA allowance for the year. On every pound you save, the government adds 25p, paid monthly. Save the full £4,000 each year and that is £1,000 of bonus money, year after year.
There are only two ways to use the pot without losing out. The first is to buy your first home. The second is to leave the money untouched until you are 60, at which point you can withdraw the lot, bonus included, to spend however you like in retirement. Take the money out for any other reason — a wedding, a car, an emergency boiler replacement — and you pay a withdrawal charge of 25%. That charge is the part most people misread.
The 25% penalty is not the same as the 25% bonus
Here is the bit that stings. The government adds 25% when you pay in, but the penalty is 25% of the total balance when you take money out early. Those are not symmetrical. Say you pay in £4,000 and receive a £1,000 bonus, giving you £5,000. Withdraw that £5,000 early and the 25% charge is £1,250, leaving you with £3,750. You have not just lost the bonus — you are £250 down on your own original money. The penalty effectively claws back the bonus and then takes a slice of your savings on top.
The £450,000 cap that has not moved since 2017
To buy a home with your LISA, the property must cost £450,000 or less. That figure was set in April 2017 when the scheme launched, and it has never been raised. The trouble is obvious once you look at what has happened to house prices in the years since. According to the Office for National Statistics, the average UK house price has climbed from roughly £220,000 in 2017 to around £290,000 by early 2026. In London the average has pushed well beyond £500,000, and across large parts of the South East a modest family home or even a one-bedroom flat now routinely lists above the cap.
If you buy a property over £450,000, even by a single pound, you cannot use your LISA for the purchase without triggering the 25% early-withdrawal charge. A first-time buyer who has been diligently saving for six or seven years, watching their target home creep over the threshold as prices rose, can suddenly find the entire scheme works against them. The cap punishes exactly the people in the most expensive markets, who arguably needed the help most.
What happens if your dream home costs £455,000
Imagine you have £20,000 in your LISA, of which £4,000 is government bonus. You find a flat in Reading at £455,000. Use the LISA and you are over the cap, so you pay the 25% penalty — £5,000 gone. Don't use it, and your deposit shrinks. Either way the scheme that was meant to help you buy has become an obstacle. The cruel detail is that the cap applies to the purchase price, not the mortgage or the deposit, so a few thousand pounds over the line costs you thousands in penalties.
Should you still open one in 2026?
For most first-time buyers, yes. If you are buying outside London and the South East, where average prices sit comfortably below £450,000, the LISA remains one of the best deals going. A free £1,000 a year is hard to beat, and over five years of full contributions that is £5,000 of bonus money that goes straight onto your deposit. Couples buying together can each hold a LISA, doubling the bonus to £2,000 a year between them, which adds up fast.
The picture is murkier if you are saving towards a home in an expensive postcode. My advice: be honest about the realistic price of the home you will actually buy in five years' time, not today's price. If you are in Manchester, Leeds, Glasgow or Cardiff, the cap is unlikely to trouble you and you should open a LISA now. If you are aiming at Zone 3 in London or anywhere in the commuter belt around it, do the sums carefully — you may be better off splitting your savings between a LISA and a regular cash ISA, so that some of your money stays penalty-free if the property tips over the cap.
A few practical points worth holding onto before you commit:
- You must hold the LISA for at least 12 months before you can use it to buy a home. Open one the week before you exchange and the bonus is no help to you at all.
- Cash LISAs and stocks-and-shares LISAs both exist. For a house purchase within five years, a cash LISA from a provider such as Moneybox or Skipton Building Society avoids the risk of a market dip wiping out your deposit at the wrong moment.
- The bonus is paid monthly, so paying in early in the tax year means your money starts earning the top-up sooner.
- The cap is on the property price, not your share of it — this matters for shared-ownership buyers, where the full market value of the home must still be £450,000 or less.
The reform that keeps not happening
Campaigners, including Martin Lewis and a string of consumer groups, have been calling for the £450,000 cap to rise in line with house prices for years. The Treasury Select Committee recommended scrapping or reforming the penalty back in 2023, suggesting the early-withdrawal charge be reduced to 20% so savers at least get their own money back. As of mid-2026, neither change has happened. The cap is frozen, the penalty stands at 25%, and every month house prices edge a few more first-time buyers towards the wrong side of the line.
None of this makes the Lifetime ISA a bad product. It makes it a product with a sharp edge that the rules have refused to sand down. Know where the £450,000 line sits in your area, work out whether your future home is likely to clear it, and the LISA will do exactly what it promises. Ignore the cap and assume the bonus is unconditional, and you could hand the Treasury £1,250 of your own savings for the privilege of buying a flat that cost a thousand pounds too much.
One last thing about the age limit
There is a quieter unfairness in the rules that gets less attention than the property cap. You can only open a Lifetime ISA before you turn 40, and the bonus stops the day you hit 50. Anyone who comes to the scheme late — perhaps after a divorce reset their finances, or after years of renting in a city where buying never looked realistic — gets a much shorter window to build the pot. If you are in your late thirties and there is any chance you will buy a first home or use the LISA as a retirement top-up, open one now, even with a token £1, purely to start the 12-month clock and lock in your eligibility before your fortieth birthday closes the door. The pound you put in today buys you the right to use the scheme for the next decade. Waiting two years could cost you that right altogether, and unlike the property cap, this is one deadline the Treasury will not be persuaded to move.