What is a lifetime ISA and how does it work?
Answered 11 March 2026
Based on the sources retrieved, I can only provide a partial answer about the Lifetime ISA, as the available documents do not contain comprehensive detail about how it works (e.g., contribution limits, age eligibility, withdrawal rules, or the first home purchase mechanism).
What the law says
- The government bonus paid under a Lifetime ISA is paid pursuant to the Savings (Government Contributions) Act 2017.
- No liability to income tax arises in respect of a payment of, or in respect of, a government bonus under section 1 or 2 of the Savings (Government Contributions) Act 2017 (ITTOIA 2005, s.775A).
- Income from a Lifetime ISA continues to be exempt for a deceased's estate for up to 3 years following death, pursuant to Reg 2G inserted into SI 1998/1870 from 6 April 2018.
HMRC guidance / practice
- The Lifetime ISA was introduced from 6 April 2017.
- Life insurance policies can be held within a Lifetime ISA (since 6 April 2017), provided certain conditions are met.
- The government bonus paid in respect of a Lifetime ISA is disregarded entirely when calculating investment income for tax credits purposes.
- The ISA Regulations are contained in SI 1998/1870, and detailed guidance for ISA managers is published on gov.uk.
I could not find authoritative source material in the available documents covering the full mechanics of the Lifetime ISA — including the annual contribution limit (£4,000), the 25% government bonus, the age eligibility window (18–39), permitted withdrawals (first home purchase or retirement at age 60+), or the withdrawal penalty for unauthorised withdrawals. For comprehensive guidance, you should consult:
- HMRC's ISA managers' guidance on gov.uk
- SI 1998/1870 (the ISA Regulations, as amended)
- The Savings (Government Contributions) Act 2017 directly
Citation sources
The separate insurance Individual Savings Account (ISA) was abolished on 5 April 2005. Since 6 April 2005, provided certain conditions are met, life insurance policies can be held within the stocks and shares ISA, or, since 6 April 2017, within the Lifetime ISA. There is detailed information on ISAs in the ‘ISA managers’ guidance’ published on gov.uk. Insurers can find the guidance useful to check if a life insurance policy can be included in an investor’s ISA. The ISA Regulations themselves are
Part 6 Exempt income Chapter 9 Other income Other Government bonus for savings account or other investment plan 775A No liability to income tax arises in respect of a payment of, or in respect of, a government bonus under section 1 or 2 of the Savings (Government Contributions) Act 2017.
When calculating investment income, disregard the following: The whole amount of the government bonus paid in respect of a Lifetime Individual Savings Account (Lifetime ISA). The whole amount of the governement bonus paid in respect of a Help to Save account.
S664 defines that all (the aggregate) income received by the PRs is taken into account – after deductions. Unless it relates to a specific gift under the will (which becomes beneficially owned by the beneficiary on death and does not form part of the residuary estate). Some deemed income is not chargeable on the PRs but must be included in the income total: Stock dividends from UK companies Release of loans to participator in close company Some gains from contracts for life insurance S679 pro