ISA Deadline 2026: Only 19 Days Left — What You Need to Know

Every tax year, you get a £20,000 ISA allowance — and if you don't use it by 5 April, it's gone forever. No rollovers, no extensions. With just 19 days left in the 2025/26 tax year, the clock is ticking for anyone who hasn't maxed out their allowance yet.

An ISA (Individual Savings Account) lets you save or invest up to £20,000 each tax year completely free from income tax and capital gains tax. Whether you choose a Cash ISA, Stocks and Shares ISA, Lifetime ISA, or Innovative Finance ISA, the combined limit across all types is £20,000. Once 6 April arrives, your unused allowance from this year vanishes — it cannot be carried forward.

First, check how much of your allowance you've already used this tax year. If you've contributed nothing, even depositing a small amount is better than wasting the entire allowance. Many Cash ISAs now offer rates above 4.5% — significantly better than standard savings accounts after tax. If you're a basic-rate taxpayer, you already have a £1,000 Personal Savings Allowance, but higher earners only get £500 and additional-rate taxpayers get nothing — making ISAs even more valuable for them.

Rushing to beat the deadline can lead to poor choices. Avoid locking money into a fixed-rate ISA if you might need access to it soon. Check whether your chosen provider has any processing delays — some banks take 2-3 working days to open a new ISA. And remember, you can only pay into one Cash ISA per tax year (though flexible ISAs let you withdraw and replace within the same year without it counting as new contributions).

Even if you can only spare £50 or £100, opening an ISA before 5 April means you've claimed part of this year's allowance. Tax-free growth compounds over time, and every year you skip is an opportunity lost. Set a reminder, make the transfer, and future you will be grateful.