Deadlines are where good intentions meet real consequences. Every accountant and every landlord who has navigated the self-assessment regime understands this at the January 31 deadline. What MTD introduces is a version of that pressure four times a year. What’s more, it adds a penalty points system that builds cumulatively rather than resetting annually.
For the 2026/27 tax year, the Making Tax Digital Income Tax Self Assessment filing cycle is live for all individuals with qualifying income above £50,000. That means the April 2026 phase one cohort, where landlords and sole traders above the £50,000 income band experience their first full MTD year in 2026/27. Getting the deadline structure clear before that first year begins is considerably more useful than learning it reactively as the first missed submission triggers a penalty point.
This piece lays out the full 2026/27 MTD deadline calendar, explains the mechanics behind each date, and covers the practical planning that turns a deadline list into a workable compliance calendar.
The Structure of the MTD ITSA Year
Before the specific dates, the structure of an MTD ITSA year needs to be understood clearly. It does not mirror the self-assessment annual cycle. It has five separate compliance events, four quarterly updates, one End of Period Statement, and one Final Declaration. Each with its own deadline and its own function in the overall picture.
| Traditional Self Assessment | MTD for Income Tax |
|---|---|
| One annual filing | Four quarterly updates |
| Annual bookkeeping cycle | Continuous digital records |
| January-focused workflow | Year-round compliance |
| Manual reconciliation | Software-driven updates |
| One main deadline | Multiple filing deadlines |
Five Compliance Events – Not One
Under self-assessment, a landlord or sole trader has one primary compliance event per year. Under MTD ITSA, they have five. For individuals with both self-employment and property income, the EOPS requirement doubles, because each income source has its own End of Period Statement.
The five events for a straightforward property income client in 2026/27 are:
- Quarterly Update 1: covering the period April 6, 2026, to July 5, 2026
- Quarterly Update 2: covering the period July 6, 2026, to October 5, 2026
- Quarterly Update 3: covering the period October 6, 2026, to January 5, 2027
- Quarterly Update 4: covering the period January 6, 2027, to April 5, 2027
- End of Period Statement: covering the full tax year 2026/27
- Final Declaration: confirming total income from all sources for 2026/27
Each of these has a specific deadline. Missing any of them generates a penalty point under the new points-based system.
The Tax Year Alignment
The MTD quarterly periods are synchronized with the UK tax year and run from April 6 through April 5, each quarter from the 6th day of the first month to the 5th day of the last month. The synchronization ensures that the MTD quarterly periods are different from calendar quarters. The MTD quarterly periods do not end at March 31, June 30, September 30, and December 31. Rather, the dates are July 5, October 5, January 5, and April 5. The difference is important to be taken into account when arranging meetings with clients.
The MTD Quarterly Deadlines for 2026/27
The deadlines below are for filing in the 2026/27 tax year.
| Quarter | Period covered | Filing deadline |
|---|---|---|
| Q1 | 6 Apr 2026 – 5 Jul 2026 | 7 Aug 2026 |
| Q2 | 6 Jul 2026 – 5 Oct 2026 | 7 Nov 2026 |
| Q3 | 6 Oct 2026 – 5 Jan 2027 | 7 Feb 2027 |
| Q4 | 6 Jan 2027 – 5 Apr 2027 | 7 May 2027 |
| Final Declaration | Full 2026/27 tax year | 31 Jan 2028 |
Quarter 1: April 6, 2026, to July 5, 2026
Submission deadline: August 7, 2026
The first quarterly report deals with the income and expenditure during the first quarter of the tax year beginning 2026/27. For those phase one taxpayers who are new to MTD in April 2026, this will be their very first MTD report. It is the deadline which they are most likely to miss due to being unfamiliar with the system. Look out for things like software not set up properly and poor record keeping practices.
The August 7 deadline falls within the summer period. For practices and clients with principals or staff taking annual leave in July and August, the Q1 deadline is a timing risk. Submissions prepared in advance and filed before the holiday period reduce that risk significantly.
Preparing for the First Submission
| Task | Recommended completion date |
|---|---|
| Software selection | April–May 2026 |
| Bank feed setup | May 2026 |
| Category mapping review | June 2026 |
| Q1 records review | Mid-July 2026 |
| Q1 submission filing | Before 7 Aug 2026 |
The practical implication is that software setup needs to happen at the start of the tax year, i.e. April 2026. Not in July when the Q1 deadline is approaching. A client whose records for April and May have not been entered because the software was not set up until June has an incomplete Q1 record. Completing it retrospectively before the August 7deadline adds pressure that adequate early preparation removes.
Quarter 2: July 6, 2026, to October 5, 2026
Submission deadline: November 7, 2026
The Q2 deadline is November 7. This is the most operationally stable deadline in the MTD calendar. It falls outside the major holiday periods; it does not coincide with year-end or self-assessment peak season, and practices that have established the MTD workflow through Q1 have a full quarter of experience behind them.
For landlords, Q2 covers the summer letting period. A time when rental activity may increase holiday lets or HMOs; maintenance expenditure is often higher following the spring season, and new tenancies frequently begin. The record-keeping discipline needed to capture this activity correctly is greatest in Q2 for many residential portfolios.
Managing Maintenance Expenditure in Q2
Invoices and payments related to maintenance work represent a frequent cause of quarter two error by landlords in their submissions. Maintenance work in summer months produces invoices during the period from July through September, which must be entered, categorized, and posted in order for the Q2 submission to go smoothly.
A landlord who does not enter maintenance invoices after payment will experience an accumulation of work to be done during October, the month Q2 ends, causing errors in submission due to an overwhelming workload. The practice of posting all maintenance invoices within seven days after the date of payment makes Q2 work easier.
Quarter 3: October 6, 2026, to January 5, 2027
Submission deadline: February 7, 2027
The date for Q3 deadline will be on February 7, 2027. This will immediately come after the deadline for the Final Declaration on January 31, 2027, for the previous tax year 2025/26 in case of phase one clients, as well as the first year of self-assessment for some other clients.
The overlap of the February 7 Q3 MTD deadline with the January 31 Final Declaration deadline creates the single most significant capacity pressure point in the MTD compliance calendar. The five days between January 31 and February 7 are five days during which practices simultaneously close the January self-assessment peak and prepare Q3 MTD submissions for their 2026/27 MTD clients.
Managing the January-February Overlap
The overlap is manageable with planning. Q3 covers October, November, and December. Essentially months for which client records should be complete and available well before the February 7 deadline. For practices that begin Q3 preparation in the second half of January, the Q3 submission can be largely prepared before the January 31 deadline and filed in the first days of February without significant disruption.
The practices that will have problems meeting the deadline of February 7 are the ones which will meet the deadline reactively, meaning that once the peak period of January is over, they will begin preparations for Q3. Once this is done, however, the time available to meet the five-day deadline will be very tight.
Quarter 4: January 6, 2027, to April 5, 2027
Submission deadline: May 7, 2027
The Q4 deadline is May 7, 2027. This is the most straightforward deadline in the MTD calendar in terms of competing pressures. By now, the January peak is behind; the summer is ahead, and practice capacity is typically at its highest relative availability in May.
Q4 covers the final three months of the tax year, i.e. January, February, and March. For landlords, Q4 often includes the January rent uplift cycle, Q4 maintenance expenditure, and the year-end position on finance costs and management fees. Getting Q4 records complete and submitted promptly sets up the End of Period Statement process cleanly.
The End of Period Statement
After the four quarterly updates, the End of Period Statement is the mechanism through which the full-year picture is confirmed, adjusted, and certified. It is not an additional data collection exercise – it is the stage at which the quarterly totals are reviewed; adjustments are made, and any allowances or reliefs are claimed.
Year-End Adjustments Under MTD for Income Tax
After the fourth quarterly update has been submitted for the tax year, landlords complete the year-end finalisation process through compatible MTD software. This is the stage where accounting adjustments, corrections, and relief claims are reviewed before the Final Declaration is submitted.
According to the new HMRC scheme for MTD, the distinct End of Period Statement (EOPS), which was included in older editions of Making Tax Digital, is essentially subsumed under the finalisation process at the end of the tax year. Practically speaking, landlords will continue to do the same amount of accounting as they would normally do under the old Self-Assessment scheme, but they just need to do it using the MTD program.
| Year-end stage | Purpose | Typical timing |
|---|---|---|
| Fourth quarterly update | Completes cumulative quarterly reporting | Due by 7 May |
| Year-end adjustments | Accounting corrections, accruals, relief claims, and final tax adjustments | After tax year-end |
| Final Declaration / MTD tax return | Confirms total taxable income and final liability | Due by 31 January |
For most accounting practices, the year-end review and finalisation work will still happen during the traditional Self Assessment season between May and January. The operational difference is that the annual process now sits on top of four quarterly reporting obligations rather than replacing them.
What the Year-End Adjustment Process Covers
The year-end finalisation process is where landlords and accountants make adjustments that may not have been reflected fully in quarterly updates.
| Common year-end adjustment | Example |
|---|---|
| Accruals and prepayments | Insurance paid in advance |
| Expense corrections | Reclassifying repairs incorrectly posted |
| Private-use adjustments | Mixed personal and rental expenses |
| Property income allowance claims | Applying relevant allowances |
| Accounting basis adjustments | Cash basis vs accruals basis corrections |
The Final Declaration
The Final Declaration brings together all income sources. This includes MTD property income, MTD self-employment income, PAYE employment income, savings and dividend income, pension income, and capital gains. It produces the total tax liability for 2026/27.
The Final Declaration Deadline
Final Declaration deadline for 2026/27: January 31, 2028
This is the same date as the current self-assessment filing deadline. The payment deadline, i.e. balancing payment for 2026/27, and the first payment on account for 2027/28, is also January 31, 2028. Nothing changes on the payment side under MTD.
The Final Declaration is not simply a data submission. It is the taxpayer’s formal confirmation that all income has been reported, and all claims have been made. It replaces the SA100 tax return for income that has gone through the MTD process. Non-MTD income, which can include employment income reported through PAYE, savings and dividend income are still entered at the Final Declaration stage.
Preparing the Final Declaration Efficiently
For practices that have completed the EOPS filings early, the Final Declaration in January is a relatively straightforward final step. The income data from the MTD process is already in the HMRC system. The Final Declaration adds non-MTD income and confirms the position.
For practices that have left EOPS filings until January, the Final Declaration becomes part of the same January rush that the self-assessment return currently generates. The MTD structure does not automatically solve the January peak problem. It only solves it if practices use the nine-month EOPS window to spread the workload rather than compress it into the same six weeks as before.
The Penalty Points Calendar: What Late Submissions Cost
Understanding the deadline structure is inseparable from understanding the penalty structure. This is primarily because the points that accumulate from late submissions follow the same calendar.
| Missed submissions | Penalty position |
|---|---|
| 1 late filing | 1 penalty point |
| 2 late filings | 2 points |
| 3 late filings | 3 points |
| 4 late filings | £200 penalty triggered |
| Further late filings | Additional £200 penalties |
Points Per Missed Deadline
HMRC has confirmed a soft landing during the first MTD year for quarterly update penalties, although submissions must still be completed before the Final Declaration can be finalised. A late EOPS generates one penalty point. A late Final Declaration generates one penalty point. The points accumulate on the taxpayer’s HMRC record.
For quarterly filers, the penalty threshold is four points. Once four points are accumulated, a £200 financial penalty is triggered. Each subsequent late submission generates a further £200 penalty until full compliance is restored and the points reset.
The Reset Condition
The penalty points reset, only after a continuous period of twelve months of full compliance. All submissions made on time, without exception, for twelve consecutive months. A taxpayer who reaches four penalty points and then files one submission on time has not begun the reset. The reset clock starts from the first fully compliant submission after the breach period.
For a landlord who misses two quarterly submissions in their first MTD year through unfamiliarity with the system, the penalty points position becomes a multi-year issue. The two points from the first year carry forward. Two more missed submissions in the second year trigger the £200 penalty. Getting the compliance right from the first quarter is significantly cheaper than learning through penalty points.
Building the MTD Deadline Into a Working Calendar
The deadline structure described above is not useful as a list of dates. It becomes useful when it is built into a working practice calendar that allocates time, assigns responsibilities, and creates the advance preparation triggers that prevent deadline misses.
The Practical Planning Framework
For each quarterly deadline, the preparation work needs to start four to six weeks before the filing date. For Q1, preparation starts in late June. For Q2, preparation starts in early October. For Q3, preparation starts in early January. This means it overlaps with the January self-assessment peak and needs to be explicitly accounted for in capacity planning.
Client records cutoff dates need to be set and communicated clearly and set early enough to allow preparation time and review time before the deadline. Working backwards from the August 7 Q1 deadline: if the practice needs five working days to prepare and the client needs to provide complete records beforehand, the client records cutoff for Q1 is approximately July 23.
Final Thoughts
The most effective planning tool for MTD deadline management is a single compliance calendar that carries all five MTD events for every in-scope client alongside the other compliance deadlines that the practice manages. A calendar that shows only MTD deadlines in isolation does not capture the capacity pressure created by competing deadlines in January and February.
When to submit MTD returns is a question with specific answers which the five dates set out above. When to start preparing those submissions is a different and equally important question. The answer to which is always earlier than the deadline pressure alone suggests.
