When is the first MTD ITSA quarterly update due?

The first quarterly update for the 2026/27 tax year covers the period 6 April 2026 to 5 July 2026, with the submission deadline of 7 August 2026. Three further updates follow on 7 November 2026, 7 February 2027 and 7 May 2027, then a final declaration by 31 January 2028.

What happens if I miss an MTD ITSA quarterly update?

You get one penalty point for each missed deadline. At 4 points HMRC issues a £200 fine - then each subsequent missed deadline triggers another £200. Points reset automatically after 24 months on-time submissions, or you can clear all points by submitting 12 consecutive on-time updates plus clearing any outstanding ones from the prior 24 months.

Are MTD ITSA late payment penalties different from the points system?

Yes - late payment penalties are not points-based. For 2026/27 (first year of new MTD penalties): no penalty days 1-30 thanks to the first-year grace, then 3% of tax owed at day 15 PLUS 3% of tax owed at day 30 from day 31 onwards plus 10% annualised charge on the outstanding amount. From 2027/28 the percentage rises to 4% + 4% and grace shrinks to 15 days unless still in your first year. Separate general HMRC late-payment interest at Bank Rate + 4pp also applies from day one.

Can I align MTD quarters to calendar quarters instead?

Yes - HMRC allows an election to use calendar quarters (1 April / 1 July / 1 October / 1 January start dates) instead of the standard tax-year quarters (6 April etc). Useful if your accounting software already runs on calendar quarters. You elect this once at the start of the tax year and it remains in force until you opt out.

Do I still need to file a Self Assessment return under MTD?

Yes but in a different form. The annual 'final declaration' replaces the legacy Self Assessment SA100 - it confirms total income, adjustments and any extra income sources (employment, dividends, savings interest etc not captured by quarterly updates). Submitted via the same MTD-compatible software by 31 January following the tax year, same payment deadline as before.

What if I have multiple businesses - one MTD update or one per business?

One quarterly update PER BUSINESS, but each missed deadline still costs only ONE penalty point in total (HMRC explicitly states you cannot accumulate multiple points for the same deadline). Two sole-trade businesses + one rental property = 3 updates each quarter but maximum one point for missing the 7 August deadline across all of them.

When does MTD become mandatory at £30k?

From 6 April 2027 the qualifying-income threshold drops from £50,000 to £30,000. From 6 April 2028 it drops further to £20,000. The £30,000 + £20,000 thresholds are set in primary legislation but HMRC retains the option to defer if the rollout encounters operational issues - see the latest gov.uk MTD timeline page for confirmation closer to each commencement date.

MTD ITSA Quarterly Deadlines + Penalties 2026/27

MTD for Income Tax quarterly update deadlines - exact dates (7 Aug / 7 Nov / 7 Feb / 7 May), final declaration 31 Jan, penalty points system (4 points = £200), late payment penalties.

If your qualifying income is over £50,000 from 6 April 2026 (over £30,000 from 6 April 2027, over £20,000 from 6 April 2028), you switch from annual Self Assessment to quarterly digital updates under Making Tax Digital for Income Tax (MTD ITSA). This guide covers the exact submission dates and the points-based penalty regime - the tactical detail behind the broader MTD ITSA overview guide.

The 4 quarterly deadlines for 2026/27

Standard quarters run from 6 April. Submission deadline is the 7th of the month following the quarter end - month 4 + 1 day from the quarter start.

| Quarter | Period covered | Submission deadline | |---|---|---| | Q1 | 6 April 2026 - 5 July 2026 | 7 August 2026 | | Q2 | 6 July 2026 - 5 October 2026 | 7 November 2026 | | Q3 | 6 October 2026 - 5 January 2027 | 7 February 2027 | | Q4 | 6 January 2027 - 5 April 2027 | 7 May 2027 | | Final declaration | Whole 2026/27 tax year | 31 January 2028 |

Note the date is the 7th, not the 5th - a common confusion with the standard tax-year-end date. The extra two days give the software time to push the submission overnight after the close of the quarter.

Calendar-quarter election option

HMRC allows an election to use calendar quarters instead of tax-year quarters. Deadlines under that election:

| Quarter | Period covered | Submission deadline | |---|---|---| | Q1 (calendar) | 1 April - 30 June | 7 August | | Q2 (calendar) | 1 July - 30 September | 7 November | | Q3 (calendar) | 1 October - 31 December | 7 February | | Q4 (calendar) | 1 January - 31 March | 7 May |

The election covers all your trades + property businesses for the tax year - you can't mix. Worth electing if your accounting software already books months on calendar boundaries.

The 6 April 2026 → 31 January 2028 timeline

For your first MTD ITSA year:

6 April 2026 - MTD becomes mandatory for you (qualifying income > £50,000)
By 7 August 2026 - first quarterly update (Q1 2026/27)
By 7 November 2026 - second quarterly update (Q2)
By 7 February 2027 - third quarterly update (Q3)
By 7 May 2027 - fourth + final quarterly update (Q4)
By 31 January 2028 - final declaration + 2026/27 tax bill due

You file 4 quarterly updates THEN a final declaration THEN pay the tax. The quarterly updates don't trigger payments on their own - they're informational submissions to keep HMRC's records current. The actual tax payment still happens annually with the 31 January deadline.

The points-based late submission penalty regime

For MTD ITSA quarterly updates from 2026/27 onwards (gov.uk: penalties for MTD ITSA):

How points accumulate

Each missed deadline = 1 penalty point
You can only earn 1 point per deadline, even if you have multiple businesses each missing the same deadline
Points are shared across MTD obligations within the same business

Threshold for the £200 penalty

4 points = £200 financial penalty
Each subsequent missed deadline once at threshold = another £200

Removing points

Two routes:

Automatic - points below threshold are wiped 24 months after the missed deadline they relate to
At threshold (4 points) - all points must be cleared together. You need (a) 12 consecutive on-time submissions, AND (b) all outstanding returns from the prior 24 months filed

The 12-month + 24-month rule means once you hit 4 points you can't drop back below without a full 12-month clean record.

Late payment penalties (separate from late submission)

These apply to the actual tax bill (typically the 31 January final-declaration payment). NOT points-based. Mechanic per HMRC penalties guidance.

For 2026/27 (first year of new MTD penalties for everyone in scope)

| Days late | Penalty | |---|---| | 1-30 | Nothing - "first year" grace applies | | 31+ | 3% of tax owed at day 15 PLUS 3% of tax owed at day 30 | | 31+ ongoing | 10% annualised rate on the outstanding amount, charged daily |

The "first year" rule means anyone in scope from April 2026 has a 30-day grace before any penalty bites in 2026/27. From day 31 the cascading 3% + 3% charges apply.

For 2027/28 onwards (subsequent years)

Rates increase from 3% to 4% for both the day-15 and day-30 balance penalties (gov.uk). Grace shrinks to 15 days, UNLESS this is your first year of MTD penalties (e.g. new entrants at the £30,000 threshold from April 2027).

| Days late | Penalty (year 2+) | |---|---| | 1-15 | Nothing | | 16-30 | 4% of tax owed at day 15 (no penalty if first year of MTD penalties) | | 31+ | 4% of tax owed at day 15 PLUS 4% of tax owed at day 30 | | 31+ ongoing | 10% annualised rate on the outstanding amount, charged daily |

Bank Rate + 4pp general HMRC late payment interest (additional)

In addition to the MTD-specific percentage penalties + the 10% annualised charge above, HMRC also applies the general late-payment interest at Bank Rate + 4 percentage points from day one of the late payment. This is the standard cross-tax HMRC rate (per CLAUDE.md fact-grounding rule) and stacks on top of the MTD penalties.

Practical implications

Software-driven submission

You can't file MTD updates on the gov.uk site directly - everything goes through MTD-compatible software. The 7th-of-the-month deadline is for the software's submission to HMRC, so leave a buffer day for technical issues.

Plan around year-end

Q4 ends 5 April. Submission deadline is 7 May. Don't wait until year-end to clean up book-keeping - the Q4 update typically takes longer than Q1-Q3 because you reconcile year-end adjustments at the same time.

Set 4 calendar reminders now

For 2026/27: 7 August 2026, 7 November 2026, 7 February 2027, 7 May 2027, 31 January 2028. Five dates total. Block them in your calendar at start of tax year.

Common pitfalls

Treating MTD updates as final figures

Quarterly updates are estimates, not final returns. You don't apply capital allowances, loss relief or year-end accruals at each quarter - those happen at the final declaration. The quarterly figures are essentially "cash-in / cash-out" position updates.

Missing one update repeatedly

The points system penalises repeated lateness more than one big mistake. One missed Q3 deadline + on-time Q1/Q2/Q4 = 1 point, expires after 24 months, no fine. Miss every single deadline for a year = 4 points hit threshold = £200 + ongoing £200 each future miss until cleared.

Confusing quarterly + final-declaration deadlines

Quarterly updates: 7 August / 7 November / 7 February / 7 May
Final declaration: 31 January following tax year end
Tax payment: same 31 January

The legacy Self Assessment 31 January deadline survives - MTD adds 4 quarterly updates on TOP of that, it doesn't replace the annual deadline.

Making Tax Digital for Income Tax 2026 - the full overview - eligibility, software, exemptions
UK Class 2 + Class 4 NI for self-employed 2026/27 - the contributions side of self-employed compliance
Self-employed calculator - work out take-home including Class 2 + Class 4 NI

Frequently asked questions

When is the first MTD ITSA quarterly update due?: The first quarterly update for the 2026/27 tax year covers the period 6 April 2026 to 5 July 2026, with the submission deadline of 7 August 2026. Three further updates follow on 7 November 2026, 7 February 2027 and 7 May 2027, then a final declaration by 31 January 2028.
What happens if I miss an MTD ITSA quarterly update?: You get one penalty point for each missed deadline. At 4 points HMRC issues a £200 fine - then each subsequent missed deadline triggers another £200. Points reset automatically after 24 months on-time submissions, or you can clear all points by submitting 12 consecutive on-time updates plus clearing any outstanding ones from the prior 24 months.
Are MTD ITSA late payment penalties different from the points system?: Yes - late payment penalties are not points-based. For 2026/27 (first year of new MTD penalties): no penalty days 1-30 thanks to the first-year grace, then 3% of tax owed at day 15 PLUS 3% of tax owed at day 30 from day 31 onwards plus 10% annualised charge on the outstanding amount. From 2027/28 the percentage rises to 4% + 4% and grace shrinks to 15 days unless still in your first year. Separate general HMRC late-payment interest at Bank Rate + 4pp also applies from day one.
Can I align MTD quarters to calendar quarters instead?: Yes - HMRC allows an election to use calendar quarters (1 April / 1 July / 1 October / 1 January start dates) instead of the standard tax-year quarters (6 April etc). Useful if your accounting software already runs on calendar quarters. You elect this once at the start of the tax year and it remains in force until you opt out.
Do I still need to file a Self Assessment return under MTD?: Yes but in a different form. The annual 'final declaration' replaces the legacy Self Assessment SA100 - it confirms total income, adjustments and any extra income sources (employment, dividends, savings interest etc not captured by quarterly updates). Submitted via the same MTD-compatible software by 31 January following the tax year, same payment deadline as before.
What if I have multiple businesses - one MTD update or one per business?: One quarterly update PER BUSINESS, but each missed deadline still costs only ONE penalty point in total (HMRC explicitly states you cannot accumulate multiple points for the same deadline). Two sole-trade businesses + one rental property = 3 updates each quarter but maximum one point for missing the 7 August deadline across all of them.
When does MTD become mandatory at £30k?: From 6 April 2027 the qualifying-income threshold drops from £50,000 to £30,000. From 6 April 2028 it drops further to £20,000. The £30,000 + £20,000 thresholds are set in primary legislation but HMRC retains the option to defer if the rollout encounters operational issues - see the latest gov.uk MTD timeline page for confirmation closer to each commencement date.