Quarterly Tax Payments: What UK Freelancers Must Do Before MTD Launches

Why Quarterly Tax Payments Matter Right Now

If you're a UK freelancer or self-employed professional, you're likely familiar with the twice-yearly Payment on Account system. But with HMRC's Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) rolling out in 2026, the way you report income is changing significantly. Quarterly updates to HMRC are now a reality for many, and getting ahead of the process will save you stress, penalties, and surprise tax bills.

Understanding the Current Payment on Account System

Under the existing rules, HMRC collects tax through Payments on Account — two advance payments made on 31 January and 31 July each year. Each payment equals 50% of your previous year's tax bill. A balancing payment is then due on 31 January following the end of the tax year.

For example, if your 2024/25 Self Assessment bill was £6,000, you'd owe £3,000 on 31 January 2026 and £3,000 on 31 July 2026, plus any balancing payment once your 2025/26 return is filed.

How MTD for ITSA Changes Quarterly Reporting

From April 2026, MTD for ITSA is mandatory for self-employed individuals and landlords with combined income over £50,000. Those earning over £30,000 follow from April 2027. Under MTD, you must submit quarterly updates of income and expenses to HMRC using compatible software — but crucially, quarterly updates are not quarterly tax payments. The Payment on Account schedule remains in place for now, though HMRC has signalled a move toward more frequent payment cycles in the future.

How to Calculate Your Estimated Quarterly Tax

Even if payments remain twice-yearly, calculating your tax liability each quarter keeps you financially prepared. Here's a practical approach:

• Track income and allowable expenses monthly using MTD-compatible software such as QuickBooks, FreeAgent, or Xero.
• Estimate your annual profit by multiplying your average quarterly profit by four.
• Apply the current tax rates: 20% on profits between £12,570 and £50,270, 40% on profits between £50,271 and £125,140, plus Class 4 National Insurance at 6% up to £50,270 and 2% above that.
• Deduct your Personal Allowance of £12,570 before calculating Income Tax.
• Set aside roughly 25–30% of your net profit each month into a dedicated savings account to cover your bill.

A Practical Example

Suppose you earn £5,000 per month as a freelance consultant, giving an estimated annual profit of £60,000. After deducting your Personal Allowance of £12,570, your taxable income is £47,430. Your Income Tax would be approximately £7,486 (20% on £37,700). Add Class 4 NI of approximately £2,239, and your total liability is roughly £9,725. Dividing this by 12 means setting aside around £810 per month.

Reducing Your Payments on Account

If your income has dropped compared to the previous year, you can apply to reduce your Payments on Account via your HMRC online account or by completing form SA303. Be cautious — if you underestimate and underpay, HMRC will charge interest on the shortfall.

Practical Steps to Take Before MTD Goes Live

• Register for MTD for ITSA with HMRC if your income exceeds £50,000.
• Choose and set up HMRC-recognised MTD-compatible software immediately.
• Begin submitting quarterly updates from your April 2026 accounting period.
• Review your current Payment on Account amounts and adjust if your income has materially changed.
• Speak to a qualified accountant if you're unsure about your obligations under the new regime.

The Bottom Line

The transition to MTD for ITSA doesn't eliminate your existing tax payment deadlines — it adds a layer of quarterly digital reporting on top. Staying organised, using the right software, and calculating your estimated liability each quarter will protect you from penalties and cash flow shocks. Act now, before the system becomes mandatory and the pressure mounts.