Help to Buy ISA UK — Free Calculator 2025

Overview

Calculate Help to Buy ISA UK using the official rates and regulations for United Kingdom.

How it works

Enter the base amount and the calculator will apply the relevant rates and brackets to compute the result.

How the Help to Buy ISA Works and Who Is Eligible

The Help to Buy ISA was a government savings scheme designed to help first-time buyers save for a property deposit. Although the scheme closed to new accounts on 30 November 2019, existing account holders can continue saving into their accounts until 30 November 2029 and must claim the government bonus by 1 December 2030. The government adds a 25% bonus to savings, up to a maximum bonus of £3,000 on £12,000 of savings. This means for every £200 you save, the government adds £50. The bonus is paid when you complete on your property purchase and must be claimed through your solicitor or conveyancer, who applies directly to the scheme administrator. Eligibility requires that you are a first-time buyer aged 16 or over, purchasing a property with a purchase price up to £250,000 outside London or £450,000 in London. The property must be your only residence, and you cannot own any other property anywhere in the world at the time of purchase. Monthly contributions are capped at £200 per month after an initial deposit of up to £1,200 in the first month, making it a disciplined savings vehicle for building a deposit over several years.

Combining Help to Buy ISA with Other Schemes

If both members of a couple are first-time buyers, each can open a separate Help to Buy ISA and each receive the 25% bonus, potentially providing up to £6,000 in government contributions towards a joint property purchase. The ISA can be used alongside a Lifetime ISA, though you cannot use both the Help to Buy ISA bonus and the Lifetime ISA bonus on the same property purchase. The property must be purchased with a mortgage, and the bonus is paid directly to the conveyancer acting in the purchase, never to the individual account holder. For those who opened accounts before the deadline, continuing to maximise monthly contributions ensures the full government bonus is captured, providing a significant boost to deposit savings that can make the difference between affording a property and continuing to rent.

Tax Treatment and Account Management

Interest earned on Help to Buy ISA savings is tax-free and does not count towards your annual ISA allowance. The account can be transferred between providers to secure better interest rates without affecting the government bonus eligibility. If you withdraw funds for any purpose other than buying a qualifying first home, you lose the government bonus on the withdrawn amount, though you can continue saving and the bonus accrues on remaining and future contributions. The account must be closed once you have claimed the bonus, as the scheme is a one-time benefit for first-time buyers. Understanding these rules helps savers maximise the benefit while avoiding costly mistakes such as accidental withdrawals or missed deadlines that could forfeit the government contribution.

Maximising Your Government Bonus Before the 2030 Deadline

With the Help to Buy ISA scheme closing to new accounts in November 2019, existing account holders should plan their savings trajectory to capture the full £3,000 government bonus before the December 2030 claim deadline. At the maximum monthly contribution of £200, it takes approximately 54 months of saving to reach the £12,000 needed for the full bonus, meaning someone who opened an account in late 2019 should have accumulated sufficient savings by mid-2024. The bonus is only payable on completion of a qualifying property purchase, not on savings alone, so timing the property search to coincide with reaching your savings target maximises the scheme's benefit. Account holders who have not yet maximised their contributions should consider whether increasing monthly savings or making lump sum deposits within the annual ISA limit accelerates their path to homeownership.

Tax Benefits and Interest Comparison

Interest earned on Help to Buy ISA deposits is tax-free and does not count towards your annual ISA subscription limit, making it a highly efficient savings vehicle. When comparing providers, even small differences in interest rates compound significantly over the multi-year savings period typical of first-time buyers building a deposit. Some providers offer loyalty bonuses or guaranteed minimum interest periods that enhance returns. The tax-free status means that higher-rate taxpayers benefit even more from the interest earned, as equivalent savings in a non-ISA account would attract savings tax above the £500 personal savings allowance. Our calculator helps you model your savings trajectory and project the total deposit available when combining your contributions, accumulated interest, and the 25% government bonus.