Using a Lifetime ISA to buy your first home

A Lifetime ISA lets you save up to 4,000 pounds per tax year towards your first home and receive a 25% government bonus on top, worth up to 1,000 pounds a year. You must be 18 to 39 to open one and can keep paying in until you are 50. To use it for a property you must be a first-time buyer, buying with a mortgage, the home must cost 450,000 pounds or less, and the account must have been open at least 12 months. Withdraw for anything else before 60 and a 25% government charge applies.

You pay money in, and the bonus is added by the government, usually monthly, based on what you contributed. It is paid on contributions, not on the account balance, so you cannot earn a bonus on interest or growth.

The 4,000 pound annual limit sits inside your overall ISA allowance. If you pay 4,000 pounds into a Lifetime ISA, that reduces what you can put into other ISAs in the same tax year.

The maximum bonus is therefore 1,000 pounds per tax year, per person. That per-person point matters. A couple buying together can each hold a Lifetime ISA and each collect a bonus, so 2,000 pounds a year between them. If only one of you is a first-time buyer, that person can still use their Lifetime ISA for the purchase.

The tax year runs to 5 April. If you open an account on 1 April and pay in 4,000 pounds, then pay in another 4,000 pounds on 7 April, you have used two tax years' allowances and earned 2,000 pounds of bonus in a week. That is a legitimate and widely used trick for anyone opening an account late in the tax year.

You cannot use a Lifetime ISA to buy a first home until the account has been open for at least 12 months from your first payment in.

The practical implication is simple. Even if you are not sure you will buy, and even if you can only spare a small amount, open one now with a token contribution to start the clock. People who decide to buy in March and open a Lifetime ISA in April end up either delaying their purchase or paying the withdrawal charge to get their own money out.

The bonus also takes time to arrive after each contribution, and your conveyancer requests the funds directly from the provider rather than paying you. Allow a couple of weeks in your completion timetable for that request to be processed.

The property must cost 450,000 pounds or less. That figure is not adjusted by region and has not moved for a long time, which makes it a real constraint in London and parts of the South East.

The trap is that the cap is checked at purchase, not at contribution. Someone who saved for six years and then finds the only suitable home costs 462,000 pounds is stuck. They can either buy something cheaper, buy without using the Lifetime ISA money and leave it invested until 60, or withdraw it and accept the charge.

Understand how that charge works, because it is not simply a clawback of the bonus. The 25% withdrawal charge applies to the amount you take out, including the bonus. Pay in 4,000 pounds, receive a 1,000 pound bonus and hold 5,000 pounds. Withdraw it for an ineligible reason and the 25% charge is 1,250 pounds, leaving you 3,750 pounds. You are 250 pounds worse off than if you had never used the account, ignoring any interest.

There are limited circumstances where the charge does not apply, including reaching age 60, terminal illness, and transferring to another Lifetime ISA. Otherwise, expect it.

Providers offer both. The choice depends on your timescale.

If you expect to buy within three years, a cash Lifetime ISA is the sensible choice, because a market fall in your final year is unrecoverable in time. If your purchase is five years or more away, a stocks and shares version has historically produced more, but there are no guarantees and you should be honest about whether you would hold your nerve through a fall.

You can transfer between Lifetime ISA providers without losing the bonus or restarting the 12-month clock, as long as you do it as a transfer rather than by withdrawing and reopening. Never withdraw to move providers.

Priya opens a Lifetime ISA at 27 with 500 pounds. Over the next three complete tax years she pays in 4,000 pounds each year, mostly by standing order of 333 pounds a month.

• Contributions: 12,500 pounds.
• Bonus: 3,125 pounds, being 25% of everything she paid in.
• Interest at a modest rate over the period: call it 700 pounds.
• Total available: around 16,300 pounds.

She buys a flat for 215,000 pounds. Her Lifetime ISA covers a 10% deposit of 21,500 pounds only in part, so she tops it up with 6,000 pounds from an easy access account, and uses a further 2,500 pounds of ordinary savings for legal fees and a survey. The bonus alone saved her roughly nine months of saving.

A pension usually produces a bigger long-term pot, especially where an employer matches contributions, and higher rate taxpayers get more relief going in. But you cannot touch a pension until the minimum pension age, so it is not a route to a deposit at all.

Where the comparison becomes real is when someone with limited spare income has to choose. Two things are worth weighing. First, never give up employer matching to fund a Lifetime ISA. Matched pension contributions are free money at a higher rate than the 25% bonus. Second, if you are a basic rate taxpayer with no matching available, the Lifetime ISA bonus is equivalent in value to basic rate relief and the money comes out tax free, which makes it competitive for retirement as well as for a house.

For most first-time buyers the practical answer is: keep taking the employer match, then fund the Lifetime ISA with what is left.

• Not opening an account early enough and being caught by the 12-month rule.
• Assuming the bonus is paid on your balance rather than on your contributions.
• Forgetting that the 4,000 pounds comes out of the overall ISA allowance.
• Withdrawing to switch provider instead of doing a formal transfer.
• Buying a home just above 450,000 pounds and losing the tax advantage entirely.
• Leaving the money in a stocks and shares Lifetime ISA within a year of a planned purchase.

If your likely purchase price is anywhere near the cap, or you are unsure whether you still count as a first-time buyer, get that checked before you commit years of saving. Brokers listed in the MortgageMatch directory are FCA-authorised and can flag the issue in a five-minute conversation.