Barrister Tax Deadlines 2026/27: Every Date You Need to Know

Last updated: 28 February 2026

Missing a tax deadline costs money. HMRC charges automatic penalties and daily interest from the moment a return or payment is late. For barristers – who now face quarterly MTD obligations on top of traditional self-assessment – the number of dates to track has increased substantially for 2026/27. This calendar covers every deadline you need to know.

Self-assessment deadlines 2026/27

The 2026/27 tax year runs from 6 April 2026 to 5 April 2027. The key self-assessment deadlines are:

• 5 October 2027 – deadline to register for self-assessment if you became self-employed during 2026/27 and have not previously filed a return
• 31 October 2027 – paper tax return deadline (rarely used by barristers, but still available)
• 31 January 2028 – online self-assessment return deadline for 2026/27, plus payment of any balancing tax due and first payment on account for 2027/28
• 31 July 2028 – second payment on account for 2027/28

The 31 January deadline is the critical one. It is both a filing deadline and a payment deadline, and missing it triggers penalties on both fronts simultaneously.

MTD quarterly deadlines (NEW for 2026/27)

From April 2026, barristers with qualifying income above £50,000 must submit quarterly updates to HMRC under Making Tax Digital for Income Tax. The quarterly periods and their deadlines for 2026/27 are:

After Q4, you must also submit a final declaration (replacing the traditional self-assessment return) by 31 January 2028.

Each quarterly update summarises your income and expenses for that period using MTD-compatible software. These are not full tax returns – they are digital summaries that allow HMRC to build a running picture of your tax position throughout the year.

Barristers with income below £50,000 are not yet required to file quarterly updates, though the threshold is expected to reduce to £30,000 from April 2027. If you are close to the threshold, it is worth preparing early.

VAT return deadlines

Barristers registered for VAT must submit returns quarterly. The deadline for each VAT return is one month and seven days after the end of the VAT quarter. Standard VAT quarters and their 2026/27 deadlines are:

VAT returns must be filed digitally through MTD-compatible software. This has been mandatory since April 2022 for all VAT-registered businesses.

Payment on account dates

Payments on account spread your tax bill across two instalments, each equal to 50% of the previous year’s total liability (income tax plus Class 4 NICs). The dates are fixed:

• 31 January 2028 – first payment on account for 2027/28 (paid alongside the balancing payment for 2026/27)
• 31 July 2028 – second payment on account for 2027/28

If your income varies significantly year to year, you can apply to HMRC to reduce your payments on account. Be cautious: if you reduce them too far and underpay, HMRC charges interest on the shortfall.

HMRC penalties for missing deadlines

HMRC’s penalty regime for self-assessment is well-established. For late filing of your 2026/27 return:

• 1 day late – £100 automatic penalty
• 3 months late – £10 per day, up to 90 days (maximum £900)
• 6 months late – 5% of tax due or £300, whichever is greater
• 12 months late – further 5% of tax due or £300, whichever is greater

For late payment, HMRC charges interest (currently 7.25% per annum) from the due date, plus surcharges of 5% on tax unpaid after 30 days, six months, and twelve months.

MTD quarterly updates carry separate penalties under the new points-based system. Each late submission earns a penalty point. Once you reach the threshold (four points for quarterly obligations), each subsequent late submission triggers a £200 penalty. Points expire after a period of compliance.

The complete calendar

Every key date for a VAT-registered barrister with MTD obligations in 2026/27:

How to set up reminders

With up to ten separate deadlines during the year, a systematic approach is essential:

• Calendar alerts – set reminders two weeks before each deadline to allow time for preparation
• Accounting software – most MTD-compatible packages include built-in deadline reminders
• Accountant notifications – at Jack Ross, we send clients reminders ahead of every deadline and manage submissions on their behalf
• HMRC app – the HMRC app shows upcoming deadlines and payment dates for your specific obligations

The single most important habit is to keep your records up to date throughout the year. The barristers who miss deadlines are almost always those who leave everything to the last week. If you file your self-assessment return in April or May – months before the January deadline – you eliminate the risk entirely and give yourself time to plan for any tax liability.

Frequently asked questions

When is the self-assessment deadline for barristers?

The online self-assessment return for 2026/27 must be filed by 31 January 2028. Any tax owed for the year must also be paid by this date.

Do all barristers need to file MTD quarterly updates?

From April 2026, only barristers with qualifying income above £50,000 are required to file quarterly. The threshold is expected to drop to £30,000 from April 2027.

What happens if I miss an MTD quarterly deadline?

You receive a penalty point. Once you accumulate four points (for quarterly obligations), each subsequent late submission triggers a £200 penalty. Points can be removed after a period of compliance.

Can I file my self-assessment return early?

Yes. You can file your 2026/27 return from 6 April 2027 onwards. Filing early does not mean you pay earlier – the payment deadline remains 31 January 2028 regardless of when you file.