Lifetime ISA vs Renting — The Numbers

What Is the Lifetime ISA?

The Lifetime ISA (LISA) is a government-backed savings account designed to help people under 40 save for either a first home or retirement. You can save up to £4,000 per year into a LISA, and the government adds a 25% bonus — worth up to £1,000 per year — on everything you put in.

The bonus is paid at the end of each tax year and is added to your LISA account. When you use the LISA to buy your first home, both your contributions and the bonus are available as part of your deposit. It is, in effect, a guaranteed 25% return on the savings you put in — a remarkable offer that relatively few first-time buyers take full advantage of.

But the LISA has rules that make it less useful in certain situations. This guide looks at whether saving into a LISA while renting is a financially superior strategy to buying sooner without the bonus — using our [buy vs rent calculator](/buy-vs-rent-calculator) to frame the comparison.

The LISA Rules in 2026

Key rules you need to know:

• **Age limit:** You must open a LISA before your 40th birthday. You can continue contributing until you turn 50.
• **Contribution limit:** Up to £4,000 per year. The bonus is 25% — worth up to £1,000 per year.
• **Property price cap:** The property you buy must cost £450,000 or less. This cap has not increased since the LISA was introduced in 2017, making it a constraint in expensive areas.
• **First-time buyer only:** Neither you nor your co-buyer can have previously owned a property.
• **Penalty for non-qualifying withdrawals:** If you withdraw money for any reason other than buying a qualifying first home or retirement (after age 60), or terminal illness, you pay a 25% government penalty — which returns the government bonus but also effectively levies a 6.25% charge on your own contributions.
• **Minimum period:** The LISA must have been open for at least 12 months before it can be used to purchase a property.

The Maths: Maximising the LISA Over Three Years

Suppose you are 28, currently renting at £1,100 per month, and saving £500 per month toward a deposit. Without a LISA, saving £500 per month for three years gives you £18,000.

With a LISA (maximising contributions at £333 per month to reach the £4,000 annual limit), your three-year position looks different:

• Your contributions: £4,000 per year x 3 years = £12,000
• Government bonus: £1,000 per year x 3 years = £3,000
• LISA total: £15,000 (before any investment returns)

You can invest a LISA in stocks and shares (via providers like Moneybox or Nutmeg) or hold it in cash. A stocks and shares LISA with 6% annual growth on an average balance of £7,500 over three years adds approximately £1,350 in investment returns.

LISA total after three years: approximately £16,350.

Your remaining £167 per month goes into a cash ISA. After three years: approximately £6,300.

Total deposit pot after three years: approximately £22,650.

Without LISA (all £500 per month in cash ISA at 4%): approximately £19,400.

**The LISA advantage over three years: approximately £3,250 — effectively the government bonus net of any cash ISA return foregone.**

The Rent You Pay While Saving

The cost of the LISA strategy is the rent you pay during the saving period. At £1,100 per month over three years, that is £39,600 in rent — money that builds no equity and returns nothing to you.

This is the honest trade-off: you collect £3,000 in government bonuses, but you pay £39,600 in rent. The LISA bonus does not come close to covering the cost of renting while you save.

The LISA strategy only makes financial sense compared to buying sooner if:

1. You genuinely cannot yet buy (insufficient income for a mortgage, no credit history, too small a deposit).

2. You are close to the £450,000 property price cap and need to save a larger deposit to bring the purchase within the limit.

3. You have one or two years left before you can buy and want to maximise the bonus in that window.

When the LISA Property Price Cap Bites

In London and the South East, average first-time buyer property prices frequently exceed £450,000. If you plan to buy in these areas, the LISA is not available to you for that purchase — and the penalty for withdrawing means your LISA money is effectively locked away until retirement. You could contribute to a LISA for retirement purposes only, but you need a separate savings vehicle for your deposit.

This is a significant flaw in the LISA design. A cap set in 2017 has not kept pace with house price inflation, particularly in the capital.

The Combined Strategy

The optimal strategy for most eligible first-time buyers is to open a LISA as soon as possible (ideally before 40, and as early in your saving years as possible), contribute the maximum each year, and continue saving into a cash or stocks ISA alongside it. Use our [buy vs rent calculator](/buy-vs-rent-calculator) to determine how long your saving period needs to be and whether buying sooner without the full LISA benefit beats waiting to collect more bonuses.

In most scenarios outside London, contributing to a LISA for two to three years while renting and then buying uses the bonus efficiently without the excessive rent cost of a very long saving period.