Your £20,000 ISA allowance resets on 6 April — unused portions are gone forever. Here's how to make the most of it, building on our ISA types guide.
Why the Deadline Matters
Unused ISA allowance can't be carried forward. Over a lifetime, this represents potentially hundreds of thousands that could have been tax-sheltered.
Last-Minute Strategies
Options if it's close to 5 April.
- •Cash ISA: Transfer from savings within minutes. See Cash ISA guide.
- •Stocks & Shares ISA: Even last-minute lump sums benefit from years of tax-free growth
- •Lifetime ISA: Government adds 25% on up to £4,000/year if under 40
- •Split across types: Divide your £20,000 across multiple ISA types
Common Mistakes
Don't wait until 5 April itself — transfers take days. Don't exceed £20,000 total. Don't withdraw and redeposit unless it's a flexible ISA.
Planning for Next Year
Set up monthly standing orders to your ISA on payday. Use SYM to track progress towards your annual ISA goal throughout the year.
Frequently Asked Questions
What if I exceed £20,000?+
HMRC will remove the excess from the ISA wrapper. You may face penalties on tax-free returns earned on the excess.
Can I open a new ISA for the new tax year?+
Yes — from 6 April your new £20,000 allowance kicks in, separate from existing ISAs.
Is it worth opening an ISA with a small amount?+
Absolutely. Once inside the wrapper, money grows tax-free forever. Starting small is far better than not starting.
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