ISA Season Final Call: Your £20,000 Tax-Free Allowance Expires in 6 Days — And Easter Makes It Worse

The tax year always ends on 5 April, but this year that date collides with the Easter weekend in the worst possible way. Good Friday (3 April) is a bank holiday. Easter Saturday and Easter Sunday follow. Easter Monday (6 April) is the first day of the new tax year — too late.

Most ISA providers set internal cut-off dates before the official deadline. Processing new account applications, identity verification, and bank transfers all require working days. If you initiate a Faster Payment on Thursday evening, the money arrives — but if the provider needs to process an application or verify ID, you could be waiting until Tuesday 7 April. By then your 2025/26 allowance is gone.

The Guardian reports that Anna Bowes of The Private Office is urging savers to "get a move on as Easter is right in the midst of the end of the tax year and some providers will withdraw their offerings early". She is right. If you need to open a new <a href="/posts/cash-isa-rates-ranked-the-10-best-accounts-for-202526-and-what-they-actually">Cash ISA</a> — not just top up an existing one — you should be doing it today, Monday 30 March.

For existing ISA holders adding money to an account they already have, the logistics are simpler. A debit card payment or bank transfer to your existing provider should process within 1-2 business days. But do not test this theory on Thursday afternoon.

A <a href="/posts/your-savings-account-interest-gets-taxed-at-40-premium-bonds-dont">higher-rate taxpayer</a> with £20,000 in a standard <a href="/posts/455-risk-free-why-cash-savers-are-having-the-last-laugh-in-2026">savings account</a> earning 4.5% pays 40% tax on the interest above their £500 Personal Savings Allowance. That is £260 in tax every single year — money that disappears entirely inside an ISA wrapper.

Compound that over five years. Assume the same £20,000 earning 4% after rate adjustments. Outside an ISA, a higher-rate taxpayer keeps approximately £19,436 of cumulative interest after tax. Inside an ISA, they keep £24,333 — a difference of £4,897. Over ten years the gap widens to nearly £12,000. For basic-rate taxpayers the gap is smaller initially thanks to the £1,000 PSA, but as savings grow — particularly if you contribute £20,000 each year — interest quickly breaches that threshold.

At 4.68%, £20,000 generates £936 in year one alone — nearly at the basic-rate PSA threshold from a single year's contribution. For investors in a Stocks and Shares ISA, the numbers are starker still. Capital gains tax at 18% (basic rate) or 24% (higher rate) applies to gains above the £3,000 annual exempt amount. A portfolio growing at 7% annually on £20,000 generates £1,400 in gains in year one — nearly half the CGT exemption consumed by a single ISA year's growth.

Six base rate cuts since August 2024 brought the BoE rate from 5.25% to 3.75%. Cash ISA rates fell too, but competitive pressure among providers — amplified by ISA season and Middle East tensions pushing rate expectations higher — has kept top rates attractive. The spread between the base rate and top easy-access ISA rates is now nearly a full percentage point.

Trading 212 leads easy-access at 4.68% AER for new money, with Plum at 4.66% and Moneybox at 4.27% for transfers. Fixed rates have ticked up: Bath Building Society offers 4.40% for one year, Furness Building Society 4.45% for two years, and several challengers cluster around 4.45%. These are the best fixed ISA rates in nearly a year — driven by ISA season competition and markets pricing in a potential BoE rate pause if the Iran conflict pushes energy costs higher.

The practical takeaway: if you expect to leave the money untouched for 1-2 years, a fixed-rate Cash ISA locks in certainty. If you want flexibility, easy-access pays more today but will fall if the BoE resumes cutting. Either way, both comprehensively beat a taxable savings account for anyone approaching their Personal Savings Allowance threshold.

A note on non-standard accounts: some providers offer up to 4.81% AER through 'qualifying money market fund' structures. These hold your deposit in money market instruments rather than a traditional bank account. They still qualify for ISA tax treatment but may not have FSCS protection — check before committing. Visit our Cash ISA rates guide for the full comparison and our ISA hub for top picks across all ISA types.

Already hold investments in a general investment account? Bed-and-ISA lets you sell those holdings, transfer the cash into a Stocks and Shares ISA, and repurchase the same investments inside the tax-free wrapper. All future gains and dividends become permanently tax-free.

The CGT annual exempt amount for 2025/26 is just £3,000. With markets volatile after the FTSE 100 dropped 11% since the Iran conflict began, some investors may have crystallised losses — but those with older holdings at lower cost bases likely still hold significant unrealised gains. Bed-and-ISA crystallises the gain now — potentially within the exempt amount — and shelters everything going forward.

Most major platforms streamline the process. Hargreaves Lansdown, AJ Bell, and Interactive Investor offer automated bed-and-ISA tools that handle the sell-and-rebuy in a single transaction. Check dealing charges first — some platforms charge per trade, others offer free fund dealing. Our ISA transfer guide covers the mechanics.

The 30-day matching rule matters: HMRC matches a sale with any purchase of the same security within 30 days. By repurchasing immediately inside the ISA, the rule works in your favour — the gain is calculated against your original cost basis. For the full strategy and tax implications, see our bed-and-ISA guide.

The emergency fund builder. Less than three months' expenses saved? Put everything into an easy-access Cash ISA at 4.68%. Access matters more than return maximisation when you might need the money. Build the safety net first; optimise later. Our savings hub covers emergency fund sizing.

The tax-year maximiser. Solid emergency fund and a 5+ year horizon? Direct £4,000 to a Lifetime ISA (if eligible — aged 18-39, saving for first home or retirement) to capture the 25% government bonus. Put the remaining £16,000 into a Stocks and Shares ISA in a global index tracker. The LISA bonus alone is worth £1,000 — a guaranteed 25% return no savings account can match.

The couple's strategy. Two adults means £40,000 of combined ISA capacity for 2025/26. If one partner has used their allowance and the other has not, the unused partner should prioritise contributions. From April 2027, a couple under 65 will only have £24,000 of combined cash ISA capacity (down from £40,000 today).

Remember: you can contribute to multiple ISAs of the same type since April 2024. Spreading cash across two providers keeps each balance within the £120,000 FSCS protection limit — relevant for larger savers consolidating previous years' ISAs.

Monday 30 March (today). Check ISA contributions across all providers. Calculate remaining allowance. If you need a new ISA account, start the application now — identity verification can take 1-5 working days and the Easter weekend eats three of those.

Tuesday 31 March. Make your deposit. For Cash ISAs, debit card or faster payment is usually instant. For Stocks and Shares ISAs, transfer cash first, then place investment orders — allow 1-2 business days for settlement.

Wednesday 1 April. Confirm contributions show in your ISA dashboard. If investing, ensure purchase orders have been submitted. Check your provider's specific end-of-year cut-off — many set deadlines before 5 April for processing new applications.

Thursday 2 April — your real deadline. All money should be received and confirmed by your provider by close of business today. This is the last full working day before the Easter weekend. Bank transfers initiated after Thursday risk not clearing in time.

Friday 3 April (Good Friday) through Sunday 5 April (Easter Sunday). Bank holiday weekend. No new applications will process. Existing contributions made earlier should clear, but you cannot start anything new. The tax year ends at midnight on Sunday.

£14 billion flowed into cash ISAs in April 2025 alone — the highest monthly total since April 1999. This year's rush will be at least as large, with the 2027 allowance cut driving wealthier savers to maximise while they can. Platforms will experience surge traffic. Do not be the person trying to open an account on Thursday afternoon.

For more on ISA strategy, see our comprehensive ISA guide and our comparison of the best Stocks and Shares ISA platforms.

This article is for informational purposes only and does not constitute financial advice. You should seek independent financial advice before making any investment decisions.