Halfway Through the Tax Year: How Much of Your £20,000 ISA Allowance Is Left?
Practical guide to checking your ISA allowance usage roughly halfway through the 2026/27 tax year, and building a realistic plan for the remaining months.
A Simple Half-Year Reality Check
If you set out in April intending to use your full £20,000 ISA allowance across the tax year, a natural checkpoint arrives roughly halfway through — around early July to early October depending on exactly when you started. At the halfway point of the tax year (early October), being roughly on track for £10,000 contributed suggests you are pacing correctly for the full £20,000 by April; being significantly below that is worth addressing with a deliberate increase in monthly contributions rather than hoping to catch up in a single push near the deadline.
One Account Per Type, Per Year
A frequently misunderstood ISA rule: you can only subscribe new money to one Cash ISA and one Stocks & Shares ISA (and similarly one of each other type) within a single tax year. You are free to hold multiple ISAs from previous tax years with different providers, and you can switch which provider you use for new contributions from one year to the next — but within a single tax year, new money for a given ISA type has to go to a single account.
| ISA type | 2026/27 sub-limit | Notes |
|---|---|---|
| Cash ISA | Part of £20,000 total | One account per year for new subscriptions |
| Stocks & Shares ISA | Part of £20,000 total | One account per year for new subscriptions |
| Innovative Finance ISA | Part of £20,000 total | Peer-to-peer lending; less common |
| Lifetime ISA | £4,000 (counts within the £20,000 total) | 25% government bonus; access restrictions apply |
Transfers Don't Eat Your Allowance — But Do Them Properly
If you want to move an ISA balance from a previous tax year to a better-rate provider, always use the formal ISA transfer process — request the transfer through the new provider, who arranges the money movement directly with your old provider. This preserves the ISA's tax-free status and does not count against your current year's £20,000 allowance. Withdrawing the cash yourself and paying it into a new ISA, by contrast, breaks the tax wrapper on withdrawal and any redeposit counts as new-money against your current allowance.
Splitting the Remaining Allowance Sensibly
If you have, say, £12,000 of allowance still unused with six months of the tax year remaining, a sensible split might weigh your time horizon and risk tolerance:
- Short-term goals (under 5 years): favour Cash ISA — capital security matters more than growth potential
- Long-term goals (5+ years): consider a Stocks & Shares ISA — historically higher average returns, but with volatility
- First home or retirement (and under 40, or already have a LISA): consider topping up the Lifetime ISA to the £4,000 sub-limit for the 25% bonus, if the access restrictions suit your plans
A Simple Mid-Year Checklist
- Add up total ISA contributions across all providers so far this tax year
- Compare against a pro-rated target for £20,000 across the full year
- Check you have not accidentally opened two of the same ISA type this tax year
- If increasing contributions, decide the Cash vs Stocks & Shares split based on your time horizon
Use the calculator below to project how your remaining ISA contributions could grow, and check you are on pace to use your full allowance before April 2027.
Frequently asked questions
Can I put money into more than one ISA of the same type in the same tax year?
No — under current rules for most ISA types, you can only pay new money into one Cash ISA and one Stocks & Shares ISA (and one Lifetime ISA, one Innovative Finance ISA) per tax year, though you can hold older ISAs from previous years with other providers. You can, however, split your £20,000 annual allowance across different ISA types with different providers in the same tax year, as long as the total does not exceed £20,000.
What happens if I accidentally pay into two Cash ISAs in the same tax year?
This is an ISA rule breach and HMRC can identify it through provider reporting. In practice, providers or HMRC typically resolve this by treating one of the accounts as void for that tax year's subscription, or by working with you to correct the position — but it is best avoided. If you are unsure whether you have already subscribed to an ISA of a given type this tax year, check your provider records before opening a new one.
Does transferring an old ISA to a new provider use up my current year's allowance?
No. Transferring an ISA from a previous tax year to a new provider, done correctly through the ISA transfer process (not withdrawing and reopening), does not count against your current year's £20,000 allowance. Always use your provider's formal ISA transfer process rather than withdrawing cash and paying it into a new ISA yourself, since a manual withdrawal-and-redeposit would count as new-money against your current allowance.
Is a Lifetime ISA a good way to use spare ISA allowance if I am not buying a first home?
It depends on your age and plans. The Lifetime ISA offers a 25% government bonus (up to £1,000 a year on a £4,000 contribution) but the bonus is only fully accessible penalty-free for a first home purchase or from age 60 — withdrawing for any other reason before 60 triggers a 25% government withdrawal charge, which can leave you with less than you paid in. It is generally not a flexible short-to-medium-term general savings vehicle.
Try the calculators
ISA Calculator
Project ISA savings growth over time with the UK £20,000 annual allowance.
Compound Interest Calculator
Calculate compound interest on savings and investments over any time period.
Budget Planner
Plan your monthly budget by entering income and expenses across all categories to see your surplus or shortfall.
Related reading
Using Your £20,000 ISA Allowance Before 5 April 2027: A Practical Guide
How to maximise your £20,000 ISA allowance before the 5 April 2027 deadline, which ISA is right for you, and the one common mistake that costs you your allowance.
The Cash ISA Ladder Strategy: Staggering Maturities for 2026/27
How to build a Cash ISA ladder using fixed-rate ISAs with staggered maturity dates, keeping money tax-free while managing access and interest rate risk in 2026/27.
Stocks and Shares ISA vs Cash ISA: Which Is Right for You in 2026?
Both ISA types shelter your savings from tax, but they serve different goals. Here's how to choose between a Cash ISA and a Stocks and Shares ISA in 2026.