UK ISA Allowance Calculator – Track Your Annual Limit
Use this free ISA allowance calculator to see exactly how much of your £20,000 annual ISA allowance you have used and how much is left for the current UK tax year. Whether you save into a Cash ISA, invest in a Stocks and Shares ISA, hold an Innovative Finance ISA, or contribute to a Lifetime ISA, this ISA calculator UK tool adds it all up and flags any rule breaches instantly.
ISA Allowance Calculator
Total used of £20,000 allowance: £0.00
Remaining allowance: £20000.00
Figures are illustrative and based on the current £20,000 total ISA allowance and £4,000 Lifetime ISA sub-limit set by HMRC, which can change between tax years.
What Is the ISA Allowance?
The ISA allowance is the maximum amount you can pay into your Individual Savings Accounts (ISAs) in a single UK tax year without paying tax on the interest, dividends, or capital gains earned inside them. For the current tax year the allowance is £20,000, set by HMRC, and it can change in future Budgets, so always check gov.uk for the latest figure before relying on it. The UK tax year runs from 6 April to 5 April the following year, so your allowance resets every 6 April.
This £20,000 is a total figure across all your adult ISAs combined, not £20,000 per account type. That is exactly what the ISA allowance calculator above helps you track, since it is easy to lose count once money is split across two or three different ISA providers.
Types of ISA and How the Allowance Splits
You can spread your £20,000 across any combination of the four adult ISA types, as long as each type stays within its own sub-limit where one applies.
| ISA Type | Annual Sub-Limit | Notes |
| Cash ISA | Up to £20,000 | Tax-free savings interest |
| Stocks and Shares ISA | Up to £20,000 | Tax-free investment growth and dividends |
| Innovative Finance ISA | Up to £20,000 | Peer-to-peer lending, tax-free interest |
| Lifetime ISA (LISA) | Up to £4,000 | Counts within the £20,000 total, 25% bonus |
For example, you could put £10,000 in a Cash ISA, £6,000 in a Stocks and Shares ISA, and £4,000 in a Lifetime ISA, using your full £20,000 allowance across three account types in one tax year.
Lifetime ISA Rules and the 25% Bonus
The Lifetime ISA is designed to help you save for a first home or for retirement. You can pay in up to £4,000 a year, and the government adds a 25% bonus on top, worth up to £1,000 a year if you contribute the maximum. That bonus is paid monthly and grows alongside your savings.
Eligibility is specific: you must be 18 to 39 when you open the account, and you can keep paying in and receiving the bonus until age 50. Withdrawals are penalty-free only if you are buying your first home worth up to £450,000, or if you are 60 or over. Withdraw for any other reason and a 25% withdrawal charge applies, which effectively claws back the government bonus plus a small slice of your own capital, so treat early withdrawals with caution.
Junior ISA Allowance
A Junior ISA (JISA) is a separate tax-free wrapper for under-18s, with its own annual allowance of £9,000. This does not count against the adult £20,000 allowance, so parents or guardians can fund both their own ISAs and a child’s Junior ISA in the same tax year without any overlap.
What Happens If You Don’t Use Your Full Allowance?
The ISA allowance is strictly use-it-or-lose-it. Unused allowance does not roll over into the next tax year. If you only contribute £12,000 this year, you cannot carry forward the unused £8,000 to next year’s allowance, your new allowance simply resets to £20,000 (or whatever HMRC sets) on 6 April. This is why many savers top up their ISAs before the 5 April deadline each year.
Can You Have Multiple ISAs?
Yes. Under the flexible ISA rules introduced in recent years, you can now open and pay into multiple ISAs of the same type with different providers within the same tax year, for example two different Cash ISAs, as long as your combined contributions across all your ISAs stay within the £20,000 total. Previously you were restricted to only one ISA of each type per tax year, so this is a meaningful change that gives savers more flexibility to shop around for the best rates without breaching the rules.
Worked Example: Splitting £20,000 Across ISA Types
Say you want to balance short-term savings with long-term investing and a house deposit goal. You could allocate your full allowance like this:
- Cash ISA: £8,000 (emergency fund and short-term savings)
- Stocks and Shares ISA: £8,000 (long-term investment growth)
- Lifetime ISA: £4,000 (first home deposit, plus a £1,000 government bonus)
Total contributed: £20,000, using the full annual allowance, with an extra £1,000 LISA bonus on top for a first-time buyer. Plug these figures into the calculator above at any point in the tax year to check your running total.
FAQs
What is the ISA allowance for this tax year?
The current ISA allowance is £20,000 per adult per tax year, set by HMRC and subject to change, so always confirm the latest figure on gov.uk before relying on it.
Can I put money in more than one ISA in the same year?
Yes. You can split your £20,000 allowance across Cash, Stocks and Shares, Innovative Finance, and Lifetime ISAs in the same tax year, and under current flexible ISA rules you can even open multiple ISAs of the same type with different providers.
What is the Lifetime ISA limit?
The Lifetime ISA has its own sub-limit of £4,000 per tax year, which counts towards your overall £20,000 allowance, and contributions receive a 25% government bonus.
Does unused ISA allowance carry over to next year?
No. The ISA allowance does not roll over. Any unused allowance is lost when the tax year ends on 5 April, and a fresh allowance begins on 6 April.
Does a Junior ISA affect my own ISA allowance?
No. The Junior ISA allowance of £9,000 per year is completely separate from the adult £20,000 ISA allowance, so contributing to a child’s JISA does not reduce your own limit.