ISA Calculator 2026/27 (£20,000 allowance & LISA bonus)
Keep track of your ISA allowance across all your ISAs, see your Lifetime ISA bonus, and project tax-free growth.
Estimates for information only, using 2026/27 rates for England, Wales and Northern Ireland unless stated. Not financial or tax advice; check your own situation with HMRC or a qualified adviser.
How it works
You can put up to £20,000 a year into ISAs, split however you like between cash, stocks and shares, innovative finance and Lifetime ISAs.
A Lifetime ISA (age 18–39 to open) takes up to £4,000 of that and gets a 25% government bonus, up to £1,000 a year. It's for a first home up to £450,000 or for retirement from age 60.
Everything inside an ISA grows free of income tax and capital gains tax. From April 2027 the cash ISA limit is due to drop to £12,000 for under-65s.
Frequently asked questions
Can I have more than one ISA?+
Yes. You can pay into multiple ISAs of the same type in one tax year, within the £20,000 total.
What happens if I withdraw from a Lifetime ISA early?+
Unless it's for a first home or terminal illness, there's a 25% withdrawal charge, which takes back the bonus plus a bit more.