MTD Quarterly Filing Guide 2026: Q1 Deadline July 31 — Step-by-Step

Making Tax Digital for Income Tax went live on April 6, 2026. If you're self-employed or a landlord with income above £50,000, you're in scope. Your first quarterly filing deadline is July 31, 2026.

Most guides focus on what MTD is. This one focuses on what you actually do — software, steps, deadlines, and what happens if you miss one.

Who Needs to File: The £50,000 Threshold

MTD for Income Tax applies if your combined self-employment and property income exceeds £50,000 in the 2026–27 tax year.

HMRC uses your 2024–25 tax return to assess eligibility. If you filed Self Assessment showing more than £50,000 qualifying income, you should have received a letter from HMRC in late 2025 or early 2026 confirming you're mandated.

If your income is below £50,000, you are not mandated in 2026–27. You can voluntarily sign up for MTD, but there's no obligation until your income crosses the relevant threshold.

Partnership income is excluded from the current rollout — MTD for partnerships has a later, separate timeline.

The Four Quarterly Deadlines for 2026–27

Each quarterly update covers a fixed period. You report income received and expenses paid during that quarter. Here are all four deadlines for the 2026–27 tax year:

The final declaration (replacing the traditional Self Assessment return) is due January 31, 2028 for the 2026–27 tax year. Quarterly updates are check-ins — the final declaration confirms and settles everything.

What You Actually Report Each Quarter

A quarterly update is a summary, not a detailed breakdown. HMRC wants two numbers per income source:

• Total income received — money you actually received during the quarter (cash accounting), not invoices issued
• Total allowable expenses — costs incurred for business purposes during the same period

If you use traditional accounting (invoicing basis), you report income when invoices are raised rather than when paid. Most freelancers use cash accounting — simpler, and HMRC defaults to it for turnover under £150,000.

You don't submit receipts or invoices with the quarterly update. HMRC takes the headline figures. Receipts are for your records and may be requested during an enquiry.

What if your income crosses multiple categories? You file a separate quarterly update per income source. A freelancer who also rents out a property files one update for self-employment income and one for property income — same deadlines, separate submissions.

Step-by-Step: How to File Your Q1 Return

Here's the process from start to submission:

1. Open your MTD software — Xero, Sage, FreeAgent, QuickBooks, or whichever HMRC-approved platform you use
2. Reconcile your transactions — categorise income and expenses for April 6–July 5. This takes 20–60 minutes if your records are current, longer if you've let it slip
3. Review the summary — your software generates a quarterly update draft showing total income and total expenses. Check the figures match your bank records
4. Submit to HMRC — click Submit (or equivalent). Your software sends the update directly to HMRC via their API. No login to Government Gateway required
5. Save the confirmation — HMRC sends a submission reference. Screenshot it or save the email. This is your proof of filing

The actual submission takes under two minutes once your figures are ready. The preparation — categorising three months of transactions — is where the time goes. Batch-process your transactions monthly and Q1 filing is a 10-minute job at the end of July.

MTD-Compatible Software: Which One?

You cannot file quarterly updates through HMRC's own portal. You need third-party software. HMRC publishes a full approved list, but four platforms dominate:

FreeAgent is the strongest default for freelancers — purpose-built for sole traders, deep HMRC integration, and free if you bank with NatWest or RBS. See our full accounting software comparison for a 6-platform breakdown including pricing tiers.

If you already use a banking app like Starling or Monzo Business, check their in-app accounting integrations — several partner directly with MTD-certified providers.

Bridging software is an alternative for those who prefer to keep records in Excel or Google Sheets. Tools like VT Filing, Absolute Tax, and Rhino convert spreadsheet data into MTD-compliant submissions. Functional but more effort — purpose-built accounting software is cleaner for ongoing use.

The Penalty Structure: What Missing a Deadline Actually Costs

HMRC replaced the old £100 fixed penalty with a points-based system for MTD. Understanding it matters because the first penalty doesn't show up as a fine — it shows up as a point.

Points expire after 24 months of compliance — if you file everything on time for two years, your points reset to zero. Miss another deadline and the clock restarts.

The 2026–27 soft landing: HMRC has confirmed a grace period for the first year of mandated MTD. Penalty points can be appealed on reasonable grounds (software failure, genuine illness, unclear guidance). HMRC won't waive points automatically — you must appeal — but approvals are expected to be generous in Year 1. This does not mean you can ignore deadlines; it means a first genuine mistake with a reasonable explanation is recoverable.

Late payment penalties (separate from filing penalties) remain — tax owed and not paid accrues interest at Bank of England base rate + 2.5%.

Common MTD Filing Mistakes

These are the errors that show up most in accountant forums and HMRC queries:

1. Reporting invoices instead of payments received (or vice versa). Know whether you're on cash accounting or traditional accounting, and be consistent. Switching mid-year creates discrepancies that trigger HMRC enquiries.

2. Forgetting to include all income sources. Income from a second self-employed trade, rental income, or platform payments (Deliveroo, Etsy, eBay above the £1,000 trading allowance) must be included. Each source may need a separate quarterly update.

3. Using personal bank statements as your records. Mixed personal and business transactions are hard to categorise accurately. A dedicated business bank account makes categorisation trivial — one feed, clean data, no guessing.

4. Not reconciling before submitting. Most software allows you to submit unreconciled figures. Don't. Spend 20 minutes checking totals against your bank statements before you click Submit. Corrections can be made in subsequent quarters, but errors attract attention.

5. Missing the final declaration deadline. Quarterly updates are summaries — they don't trigger your tax bill. The final declaration (January 31, 2028 for 2026–27) is where you confirm your total figures, claim allowances, and settle what you owe. Missing the final declaration carries separate, larger penalties.

6. Treating quarterly updates as optional. Some freelancers assume that if they file their annual Self Assessment, they're covered. They're not. MTD quarterly updates are a separate statutory obligation. Filing your annual return doesn't satisfy the quarterly requirement.

What MTD Means for Your Side Hustle Tax Position

If your side hustle income crosses £50,000 combined with any property income, you're mandated for MTD. Most side hustlers in 2026 won't hit this threshold — but if you're building toward it, set up MTD-compatible software now rather than scrambling when you cross the line.

There's also a practical upside to quarterly reporting: you know roughly what your tax bill will be throughout the year, not just in January. Quarterly updates force the discipline that most freelancers lack — knowing your numbers before HMRC demands them.

For the broader picture on how MTD connects to your annual tax position, see our complete MTD for Income Tax guide.

Next Steps

If July 31 is your first MTD deadline:

1. Confirm you're in scope — check your 2024–25 Self Assessment return or the HMRC letter you should have received
2. Choose and set up MTD software — FreeAgent (free with NatWest/RBS), QuickBooks, Xero, or Sage. Connect your bank feed now
3. Categorise April–July transactions — do it now, not on July 30. Most platforms surface uncategorised items as a to-do list
4. Submit by July 31 — ten minutes once your records are clean
5. Set calendar reminders for all four quarterly deadlines — October 31, January 31, May 31

The software does the heavy lifting. The discipline — categorising transactions regularly instead of in one panicked session — is what separates freelancers who find MTD easy from those who don't.

See also: Best Accounting Software UK 2026 · MTD for Income Tax: Complete Guide · Side Hustle Tax Guide 2026 · Best Business Bank Accounts UK 2026