12th February 2026
The ISA deadline is the 5th April. Find out why this is important and how you can make the most of your savings.
Understanding how ISAs work can help you make the most of your tax‑free savings each year. Whether you're looking to grow your money over time or simply want a safe place to save without losing interest to tax, knowing the rules, deadlines, and flexibility options is key.
An ISA (Individual Savings Account) is a type of savings account that allows you to save money without paying tax on the interest you earn. In an ISA, you can save up to a certain amount each tax year, which is set by the government. The current limit is £20,000 per tax year, and this can be split between different types of ISAs, such as a cash ISA or a stocks and shares ISA.
From the 2027/28 tax year (6 April 2027 to 5 April 2028), anyone under 65 will be able to save up to £12,000 a year into a Cash ISA. The overall ISA allowance remains £20,000, so you can still use the remaining allowance in other ISA types such as a Stocks & Shares ISA.
The ISA deadline is the final date you must pay into your ISA to take advantage of that financial year's tax benefits. The ISA deadline is usually on the 5th April each year.
If you have not used your full annual ISA allowance by the deadline, you will lose the remainder of your allowance for that tax year. The current annual ISA allowance for each tax year is currently £20,000, and any unused allowance cannot be carried over to the next tax year.
A flexible ISA allows you to withdraw money from your ISA and then replace it in the same tax year without it counting towards your annual ISA allowance.
For example, if you have contributed £10,000 to your ISA in the current tax year, and you withdraw £5,000, you would normally only be able to contribute an additional £10,000 to your ISA in the same tax year. However, with a flexible ISA, you can add the £5,000 withdrawn funds back into your ISA without affecting your annual allowance.
This feature provides greater flexibility to ISA savers, allowing them to access their savings if needed without losing out on their tax-free allowance for the year. However, it is important to note that not all ISA providers offer this feature, so be sure to check with your provider before making any withdrawals or contributions.