On 6 April every UK tax year resets — new ISA and dividend allowances, frozen tax thresholds, fresh CGT AEA, and a possible tax-code revision. Tell us your situation; we’ll return a prioritised checklist of what to do, what changed for you in pounds, and the deadlines to hit.
"Frozen + reset" means: the allowance figure does not change year-on-year, BUT the unused portion does not carry over — it resets to zero on 6 April. If you do not use it before then, it is gone for the year.
Already announced for 6 April 2027: savers under 65 will be able to put no more than £12,000 of their £20,000 ISA allowance into cash ISAs, and Income Tax on savings and property income rises to 22%, 42% and 47%. The Personal Allowance and higher-rate threshold stay frozen until 5 April 2031.
How to check whether you've banked all the year-end allowances before 5 April and reset cleanly for the new year.
Anna — basic-rate, ISA + pension to check
ISA contributions to date
£12,400 of £20,000
Pension contributions
£3,600 personal + £2,400 employer = £6,000 of £60,000 AA
CGT realised this year
£1,200 of £3,000 exemption
Days remaining to 5 April
11
The maths:
ISA: £7,600 unused — top-up to use the rest
Pension: £54,000 of this year's £60,000 allowance unused; any unused allowance can be carried forward for up to 3 later tax years, so it is not lost on 5 April
CGT: £1,800 of allowance unused — opportunity for Bed-and-ISA on any unrealised gains
Marriage Allowance: if her partner earns under £12,570, a claim can still go back to 2022/23, but only until 5 April 2027 (4-year limit)
Result: Anna has £7,600 of ISA allowance and £1,800 of Capital Gains Tax allowance left for this tax year. If she has the cash, an ISA top-up, or a Bed-and-ISA that realises up to £1,800 of gains, would use them before they reset. With 11 days left, any sale and ISA payment has to complete by 5 April.
Sacrificing £3,000 more to pension brings ANI to £100k — full PA restored
Tax saving: 60% × £3,000 = £1,800
Net cost of additional pension contribution: £3,000 − £1,800 = £1,200
Plus AA carry-forward unused — could go higher if cash flow allows
Result: A further £3,000 of pension contribution before 5 April would cut Marcus's Income Tax by about £1,800. With carry-forward, his total pension savings this year could reach £100,000 before the annual allowance is exceeded, though his own contributions only get tax relief up to the amount of his earnings.
Figures use 2026/27 UK tax-year rates and thresholds. Always verify against your specific payslip or tax statement before acting.
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