The story: BBC News reported this morning that a 5% deposit on the current average UK house price of £272,000, plus moving costs and legal fees, now comes to about £16,850, citing figures from financial information service Moneyfacts. The piece sets out four ways to make a start on a deposit: paying a fixed amount into a savings account the day after payday, using a Lifetime ISA for its 25% government bonus, starting as early as possible to let compound interest do the work, and mortgages that need as little as £5,000 down. Anna Bowes, savings expert at The Private Office, and David Hollingworth of mortgage broker L&C are both quoted with real figures rather than generic tips.
Our view: the £16,850 isn't the story. The £1,000 a year the government hands over is.
£16,850 is presented as a wall, and for a lot of households it reads like one. It shouldn't be the number you fixate on. The far more useful number in that BBC piece is 25% — the government bonus on a Lifetime ISA, paid every single year, on top of whatever growth the account itself makes. There is no other mainstream product where the government simply adds a quarter to what you put in. Not a savings rate, not a cashback card, nothing. If you're saving for a first home and don't already have one of these open, that's the actual headline.
The reason this doesn't feel like the headline is that a 25% bonus on £4,000 is "only" £1,000 a year, which sounds modest next to £16,850. But money that arrives free, every year, compounds the target down faster than almost any amount of extra saving effort. The rest of this piece is about making that concrete rather than abstract.
What the Lifetime ISA actually offers, in full
GOV.UK sets the rules plainly. You can pay in up to £4,000 a year, and the government adds a 25% bonus, up to £1,000 a year, provided you open the account before your 40th birthday. To use the money towards a first home, three conditions apply: the property must cost £450,000 or less, you must be buying with a mortgage, and the account must have been open for at least 12 months before you use it. Miss any of those and the money isn't lost, but it isn't available for the house either — it stays growing towards age 60 instead.
There's a genuine catch, and it's worth stating plainly rather than glossing over: withdraw the money for any reason other than a qualifying first home, turning 60, or a terminal illness, and a 25% withdrawal charge applies to the whole balance, bonus included. Put in £1,000, the bonus takes it to £1,250, and an unauthorised withdrawal charges 25% of that £1,250 — £312.50 — leaving £937.50. That's £62.50 less than you actually paid in. The penalty is designed to claw back the bonus and then some, which is exactly why a Lifetime ISA should hold only money you're genuinely confident will go towards one of those three purposes.
What £16,850 looks like with the bonus doing its job
Take a single first-time buyer maxing the Lifetime ISA at £4,000 a year — about £333 a month. With the 25% bonus, that's £5,000 a year working towards the deposit. Reaching £16,850 takes about 3 years and 4 months, before any interest the account itself pays. (Illustrative — ignores interest and any change in the target house price, and assumes the full allowance is used every year.)
Now a couple, each with their own Lifetime ISA, putting in a more realistic £200 a month each — £2,400 a year per person, £4,800 combined. The bonus adds £600 each, £1,200 combined, for £6,000 a year total. The same £16,850 target arrives in about 2 years 10 months — nearly six months sooner than the solo saver, on a monthly amount most two-income households could plan around.
Stretch that couple to maxing both accounts — £4,000 a year each, £8,000 combined, plus £2,000 combined bonus — and the target arrives in about 1 year 8 months. £2,000 of that is money neither of them earned.
The pattern holds regardless of which tier fits your budget: the bonus doesn't just add to the total, it shortens the timeline, because it's paid every year on top of contributions that are also growing the pot. That's the mechanic Anna Bowes is describing when she tells the BBC that saving £50 a month from age 20 grows to about £41,000 by 50, assuming 5% annual growth — and that starting ten years later needs more than double, £101 a month, to reach the same figure at the same age. Time and free money both compound. Waiting costs you both.
The cap that matters, and the one that mostly doesn't
The £450,000 property price cap on Lifetime ISA use sits comfortably above the £272,000 national average, so for most buyers it isn't the constraint people assume it is. It matters more in the most expensive parts of the country, where a starter home can sit above that line — anyone buying in London or the South East should check the likely price of the home they actually want before relying on the Lifetime ISA to fund all of it.
The 12-month rule matters more broadly, and catches people out more often. If you open a Lifetime ISA now expecting to buy within the year, the bonus on this year's contributions is still real, but you can't use any of the account for a purchase until the account itself turns one. That's a planning point, not a reason to delay opening one — the clock only starts once you do.
What this means for a real household, this week
1. If you're under 40 and don't have a Lifetime ISA, open one this week. The bonus is paid on contributions made during the tax year, so every month without one open is a month of free money that can't be backdated. GOV.UK lists the providers at gov.uk/lifetime-isa.
2. Work out your own target, not the national average. £16,850 is a UK-wide figure, and Moneyfacts' own average house price hides large regional gaps either side of it. Our cost of buying a home calculator works from your own likely purchase price rather than the national one.
3. If you're saving as a couple, check you can both open one. Doubling the bonus is one of the single biggest levers available to first-time buyers, and it only works if both of you are genuine first-time buyers with your own accounts. Our first-time buyer guide walks through exactly how the combined-LISA approach works alongside stamp duty relief and the rest of the process.
4. Treat the account as house-only money. If there's any real chance you'll need the money for something else within the next few years, keep that portion in an ordinary savings account or ISA instead — the 25% charge exists precisely to make raiding a Lifetime ISA a bad idea.
What's still uncertain
BBC News reports that ministers are planning to replace the Lifetime ISA with a new First Time Buyer ISA, but no rules, no property price threshold and no start date have been published. That's a genuine unknown, not a reason to pause. The Lifetime ISA is the scheme that exists today, with a bonus paid every year you use it; a future scheme with different terms doesn't return the bonus years you didn't claim while waiting for it. If a firmer announcement lands with real detail, that's a story we'll come back to — for now, the account that's actually open is the one worth using.
None of this is a recommendation of any specific Lifetime ISA provider, and we don't arrange or sell one — this is the arithmetic behind a scheme that already exists, not advice on which bank or building society to use it with.