2026/27 tax year

UK tax deadlines: every date that can cost you money

Self Assessment, payments on account, the new MTD quarterly updates, VAT, PAYE and employer dates, all in one place, with what happens if you miss each one. Sign up below and we will email you 7 days and 1 day before the ones that apply to you.

Next deadline

Monday 5 October 2026

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Reviewed by TaxFly Editorial Team Every date links to official GOV.UK guidance

Upcoming deadlines, in order

Oct 2026

Register for Self Assessment (2025/26)

in 48 days Self-employed & landlords Key dates for everyone

If you had new untaxed income in the year to 5 April 2026 (self-employment, rental income, high income Child Benefit charge, large savings or dividend income), you must tell HMRC by this date.

If missed: Register late and you can be fined a percentage of the tax due if the return is then late too.

GOV.UK guidance

Oct 2026

Paper Self Assessment return for 2025/26

in 74 days Self-employed & landlords

Deadline for filing your 2025/26 return on paper. Filing online instead gives you until 31 January 2027.

If missed: A £100 automatic penalty, even if you owe no tax.

GOV.UK guidance

Nov 2026

MTD for Income Tax: Q2 quarterly update

in 81 days Self-employed & landlords

Second quarterly update (6 July to 5 October) for those in Making Tax Digital for Income Tax.

If missed: Late updates earn penalty points; enough points trigger a £200 fine.

GOV.UK guidance

Dec 2026

File online to pay through your tax code

in 134 days Self-employed & landlords Key dates for everyone

If you owe under £3,000 and also have PAYE income, filing your online return by 30 December lets HMRC collect what you owe through next year's tax code instead of a lump sum.

If missed: Miss it and you simply pay the bill in full by 31 January instead.

GOV.UK guidance

Jan 2027

Self Assessment online return and payment for 2025/26

in 166 days Self-employed & landlords Key dates for everyone

The big one: your 2025/26 online return, the balancing payment for 2025/26 and the first 2026/27 payment on account are all due by midnight.

If missed: £100 automatic fine, then daily penalties from 3 months late, plus interest on unpaid tax.

GOV.UK guidance

Feb 2027

MTD for Income Tax: Q3 quarterly update

in 173 days Self-employed & landlords

Third quarterly update (6 October to 5 January) for those in Making Tax Digital for Income Tax.

If missed: Late updates earn penalty points; enough points trigger a £200 fine.

GOV.UK guidance

Apr 2027

Tax year ends: last day for 2026/27 allowances

in 230 days Key dates for everyone

Use it or lose it day. Your £20,000 ISA allowance, £3,000 Capital Gains Tax allowance, pension annual allowance and Marriage Allowance backdating all reset after today.

If missed: Nothing to pay, but unused allowances are gone for good.

GOV.UK guidance

Apr 2027

New tax year begins (2027/28)

in 231 days Key dates for everyone

New tax codes take effect and allowances reset. A good day to check your first payslip of the year against your tax code.

If missed: No penalty; just check your new tax code is right.

GOV.UK guidance

Apr 2027

Final Full Payment Submission for 2026/27

in 244 days Employers & payroll

Employers must send the final FPS (or EPS) for the 2026/27 tax year to HMRC.

If missed: Late filing penalties start at £100 per month depending on headcount.

GOV.UK guidance

May 2027

MTD for Income Tax: Q4 quarterly update

in 262 days Self-employed & landlords

Final quarterly update (6 January to 5 April) for those in Making Tax Digital for Income Tax.

If missed: Late updates earn penalty points; enough points trigger a £200 fine.

GOV.UK guidance

May 2027

P60s must reach employees

in 286 days Employers & payroll Key dates for everyone

Employers must give every employee on the payroll at 5 April 2027 their P60 by this date. Employees: your P60 is the document you need for refund claims and mortgage applications, so chase it if it has not arrived.

If missed: Employers can be fined for not providing P60s on time.

GOV.UK guidance

Jul 2027

P11D and P11D(b) filing deadline

in 322 days Employers & payroll Limited companies

Report 2026/27 employee benefits and expenses (company cars, medical cover, loans) to HMRC and give employees their copies.

If missed: £100 per 50 employees for each month late.

GOV.UK guidance

Jul 2027

Class 1A National Insurance payment

in 338 days Employers & payroll Limited companies

Electronic payment of Class 1A NIC on benefits reported in the P11D(b) must clear HMRC by today (19 July if paying by post).

If missed: Interest plus late payment penalties on unpaid amounts.

GOV.UK guidance

Jul 2027

Second payment on account for 2026/27

in 347 days Self-employed & landlords

The second advance instalment towards your 2026/27 Self Assessment bill.

If missed: Daily interest is charged on late payments from 1 August.

GOV.UK guidance

Free email reminders, before it costs you

We email you 7 days and 1 day before each deadline that applies to you: what it is, what to do, and the official GOV.UK link. No newsletter, no spam, unsubscribe with one click.

Key dates for everyone Self-employed & landlords Employers & payroll Limited companies

We only use your email for these reminders. See our privacy policy.

Deadlines that follow your own dates

These repeat around your own VAT quarter or company year end, so the date is yours to work out. The rules:

VAT return and payment

Self-employed & landlords Limited companies

One calendar month and 7 days after your VAT quarter ends. Example: quarter ending 30 June is due by 7 August.

GOV.UK guidance

PAYE and NIC to HMRC

Employers & payroll

The 22nd of every month if paying electronically (the 19th by post). Quarterly if you usually pay under £1,500 a month.

GOV.UK guidance

CIS monthly return

Employers & payroll Limited companies

The 19th of every month, covering the tax month just ended, if you pay subcontractors under the Construction Industry Scheme.

GOV.UK guidance

Corporation Tax payment

Limited companies

9 months and 1 day after your company's accounting period ends. Example: year end 31 March means payment by 1 January.

GOV.UK guidance

Company Tax Return (CT600)

Limited companies

12 months after your accounting period ends. Note the tax is due before the return.

GOV.UK guidance

Annual accounts to Companies House

Limited companies

9 months after your company's financial year ends (21 months after incorporation for the first set).

GOV.UK guidance

Confirmation statement

Limited companies

At least once every 12 months, within 14 days of your review period ending.

GOV.UK guidance

Frequently asked questions

Online returns and payment for the 2025/26 tax year are due by midnight on 31 January 2027. Paper returns are due earlier, by 31 October 2026. Missing the online deadline triggers an automatic £100 fine even if you owe nothing.

If you are in Making Tax Digital for Income Tax (sole traders and landlords with qualifying income over £50,000 from April 2026), quarterly updates are due by 7 August, 7 November, 7 February and 7 May each year.

The UK tax year runs from 6 April to 5 April. The 2026/27 year ends on 5 April 2027, which is also the last day to use that year's ISA, Capital Gains and pension allowances.

An automatic £100 penalty applies immediately. After 3 months HMRC adds £10 a day (up to £900), then further percentage penalties at 6 and 12 months, plus interest on any unpaid tax. Filing even one day late costs money, so file something and amend it later if needed.

For most businesses, one calendar month and 7 days after the end of your VAT quarter. A quarter ending 30 June must be filed and paid by 7 August. Direct debit payments are collected a few days later.

Planning for a deadline? Work out what you owe first with the self-employed tax calculator or check whether MTD applies to you.