Savings & Investments
Help to Buy ISA Calculator
Calculate the 25% government bonus on your Help to Buy ISA savings. See your total deposit fund for a first home purchase.
Closed to new accounts since 30 November 2019. Existing holders can save until 30 November 2029 and must claim the bonus before 1 December 2030. If you don't already have one, the Lifetime ISA is the better alternative.
Your details
How much you have already saved (max £12,000)
Maximum £200/month (£2400/year)
You can save until 30 November 2029
Your results
Help to Buy ISA Bonus on £12,000 Savings
Total deposit fund
£15,000
Government bonus
£3,000
- Your savings
- £12,000
- Max qualifying savings
- £12,000
- Total fund at completion
- £15,000
Breakdown
- Your savings
- £12,000
- Government bonus (25%)
- £3,000
- Total deposit fund
- £15,000
You've reached the maximum qualifying savings of £12,000. You'll receive the full £3,000 government bonus at completion.
Key rules
Help to Buy ISA: key facts
The Help to Buy ISA closed to new accounts on 30 November 2019. If you already have one, you can continue saving until 30 November 2029 and must claim the bonus before 1 December 2030. You can save up to £200 per month (plus £1,000 in the first month when opening), and the government adds a 25% bonus at completion.
The minimum savings to qualify for any bonus is £1,600 (giving a £400 bonus). The maximum bonus is £3,000, achieved on £12,000 of savings. The bonus is paid by your solicitor at legal completion, it cannot be used for the exchange deposit.
Property price limits
The property you buy must cost no more than £250,000 outside London, or £450,000 in London. It must be your first home, purchased with a mortgage, and used as your main residence, not a buy-to-let or holiday home.
These limits are notably lower than the Lifetime ISA's £450,000 national limit, which is one reason the LISA is generally considered the better option for first-time buyers who haven't yet opened either account.
Help to Buy ISA vs Lifetime ISA
Both accounts offer a 25% government bonus, but the Lifetime ISA has several advantages: a higher annual contribution limit (£4,000 vs £2,400), a higher property price limit (£450,000 everywhere), and the same bonus rate. You can hold both accounts simultaneously, but you can only use the government bonus from one of them for a first home purchase.
If you're yet to buy your first home and have both, compare the bonus amounts carefully before choosing which to use, in most cases the LISA bonus will be larger. See the Lifetime ISA calculator to compare your projected figures.
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Frequently asked questions
Sources & methodology
Built and maintained by Tim, a personal finance enthusiast (not a financial adviser). Last reviewed April 2026. Rates and thresholds come from official UK government publications.
- GOV.UK: Individual Savings Accounts · ISA allowances, types and eligibility rules
- HMRC: Lifetime ISA · LISA bonus, withdrawal rules and limits
Figures are estimates only. This is not financial or tax advice. For help with your specific situation, speak to HMRC or a qualified adviser.