The end of the tax year is fast approaching, and if you haven't used your full ISA allowance for 2025/26, you're running out of time. Every UK adult gets a £20,000 annual ISA allowance — and any unused portion vanishes on 5 April 2026. Whether you're a seasoned saver or just getting started, the SYM app can help you track your progress and hit your savings targets before the deadline.
What Is the ISA Allowance for 2025/26?
- •Cash ISA: Earn tax-free interest on savings deposits
- •Stocks and Shares ISA: Invest in funds, shares, and bonds tax-free
- •Innovative Finance ISA: Earn tax-free returns from peer-to-peer lending
- •Lifetime ISA: Save up to £4,000/year with a 25% government bonus (age 18-39 to open)
Why March Is the Crucial Month
- •Allow 5-10 working days for new ISA applications to be processed
- •Transfer requests between providers can take up to 30 days
- •Some providers stop accepting new applications in late March due to demand
- •Direct debit contributions may need to clear before 5 April to count
Strategies to Maximise Your ISA Before April
- •Lump sum deposit: If you have cash sitting in a standard savings account, move it into a Cash ISA to shelter future interest from tax
- •Bed and ISA: Sell investments held outside an ISA and repurchase them inside a Stocks and Shares ISA to shelter future gains
- •Use your Lifetime ISA allowance: If you're saving for your first home or retirement, the 25% bonus on up to £4,000 is effectively free money
- •Split between ISA types: You can put £16,000 in a Cash ISA and £4,000 in a LISA, or any combination up to £20,000
- •Track your contributions with the SYM app to avoid accidentally exceeding the limit
Common ISA Mistakes to Avoid
- •Don't confuse ISA transfers with new subscriptions — transfers preserve your allowance
- •Don't withdraw from a non-flexible ISA expecting to redeposit the same amount
- •Don't exceed the £4,000 Lifetime ISA sub-limit or you'll face a 25% withdrawal penalty
- •Don't leave it until the last working day — processing delays could push you past the deadline
FAQ
Can I carry over unused ISA allowance to next year?+
No. The ISA allowance is use-it-or-lose-it. Any portion of the £20,000 you don't use by 5 April 2026 cannot be carried forward to the 2026/27 tax year.
Can I open more than one ISA of the same type?+
Yes, since the 2024/25 tax year HMRC allows you to open and pay into multiple ISAs of the same type in a single year, as long as your total contributions across all ISAs don't exceed £20,000.
What happens if I exceed the £20,000 ISA limit?+
HMRC may void the excess subscription and you could owe tax on any interest or gains earned on the excess amount. Your ISA provider may also flag the over-subscription.
Is there a deadline time on 5 April?+
Most providers set their own cut-off times, often end of business on 5 April or even earlier. Check with your specific provider — some close online applications at midnight on 4 April.
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