UK MTD Invoice Requirements 2026

UK MTD Invoice Requirements 2026 (Making Tax Digital, Phase 2)

Big change in April 2026. Making Tax Digital for Income Tax (MTD ITSA) went live for sole traders and landlords with income over £30,000. If that's you, your invoicing and bookkeeping requirements changed. Here's what you need to know.

What Is Making Tax Digital (MTD)?

HMRC's plan to digitise tax. Started with VAT in 2019, expanded to income tax in phases.

MTD VAT (already mandatory): All VAT registered businesses must use MTD compatible software for VAT returns.

MTD ITSA Phase 1 (April 2026): Sole traders and landlords with combined income over £50K. Quarterly submissions to HMRC.

MTD ITSA Phase 2 (April 2027): Threshold drops to £30K combined income.

MTD ITSA Phase 3 (April 2028): Threshold drops to £20K combined income.

If your self-employment + property income exceeds the threshold for the year, MTD applies to you the following April.

What MTD Means for Your Invoicing

MTD changes nothing about WHAT goes on your invoice. The required fields stay the same: business name, UTR, VAT number (if registered), client details, invoice number, dates, line items, total. What changes is where the data goes.

Under MTD, your invoice data must flow into MTD compatible software (Xero, QuickBooks, FreeAgent, Sage, or one of dozens of others). HMRC pulls quarterly summaries from your software. You can no longer file annual self-assessment from spreadsheets.

The 4 Quarterly Updates Under MTD ITSA

Instead of one annual self-assessment, you submit 4 quarterly summaries plus a final annual declaration.

Each quarterly update is a basic summary: total income, total expenses by category. The annual final declaration is the proper return with adjustments and reliefs.

What You Need to Track on Each Invoice

For MTD, you need digital records of every invoice you issue. Specifically:

• Date of invoice
• Client name (or unique identifier)
• Net amount
• VAT amount (if registered)
• Total
• Category (income type, like sales, services, rental income)

If you're VAT registered, MTD VAT applies separately and you must record VAT on every transaction in real-time using MTD compatible software.

Do I Need to Buy MTD Software?

You need software that's listed on HMRC's compatible list. Many are paid (Xero £15+/month, QuickBooks £14+/month, FreeAgent £19+/month). Some are free for very simple cases.

FreeInvoicePDF.org generates the invoice PDFs and you keep digital records, but for actually filing MTD updates to HMRC you need a compatible piece of bookkeeping software. The two work together: generate invoices here, log them in your MTD software.

Penalties for Missing MTD Submissions

HMRC introduced a points-based late submission penalty system. Each late quarterly submission earns you a point. Hit a threshold and you get a £200 fine. Continuing late submissions are £200 each.

Late payment penalties apply on top:

• Up to 15 days late: 0% (just interest)
• 16 to 30 days late: 2% of unpaid amount
• 31+ days late: 4% of unpaid amount, plus 4% annualised interest on top

Adds up fast. Don't be late.

How to Get MTD Ready

If MTD applies to you for 2026/27, here's the prep.

1. Choose MTD compatible bookkeeping software. Compare Xero, QuickBooks, FreeAgent, Sage Business Cloud, Crunch.
2. Sign up for MTD ITSA via HMRC online services.
3. Connect your software to HMRC.
4. Switch your invoicing to digital (use FreeInvoicePDF.org for the actual invoices, log them in your bookkeeping software).
5. Track expenses digitally too: every receipt photographed and logged.
6. Submit your first quarterly update on time.

FreeInvoicePDF.org and MTD

FreeInvoicePDF.org generates the PDF invoice you send to clients. To be MTD compliant, you also need bookkeeping software that submits to HMRC. We're not a bookkeeping tool, we're an invoice generator. Use both: invoices here, bookkeeping in Xero/QuickBooks/FreeAgent.

Related: UK invoice template, VAT invoice generator.

Common MTD Questions

Do I need MTD if I'm under the threshold? No. Under £30K combined self-employment and property income, MTD ITSA doesn't apply. Stay on annual self-assessment.

Does MTD apply to companies? Not yet. Limited companies file Corporation Tax separately. MTD for Corporation Tax was paused indefinitely in 2024.

Can I use spreadsheets? Only if connected to MTD compatible software via "bridging software" that submits the actual data to HMRC. Standalone spreadsheets won't work.

What if my income drops below the threshold mid-year? You can apply to leave MTD ITSA. Until accepted, keep submitting.