Making Tax Digital: What UK Heating & Plumbing Businesses Need to Know

by Arran Saunders | Feb 10, 2026

Making Tax Digital for Heating & Plumbing Businesses (UK Guide)

If you’re a sole trader, the recent Making Tax Digital (MTD) changes are likely to affect the way you run your business.

Running a heating or plumbing business already involves enough admin, so changing the way you run and report your business can seem like a daunting task.

In this guide, we cover exactly what’s changing, who it affects, and how you can make your life easy going forward with MTD.

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What Is Making Tax Digital?

Making Tax Digital is HMRC’s programme to modernise the UK tax system. Instead of relying on paper records or a once-a-year tax return, MTD requires businesses to:

Keep digital records
Use approved software
Submit quarterly updates to HMRC

The goal is to reduce errors and give both HMRC and businesses a clearer picture of tax obligations throughout the year.

Making Tax Digital was already mandatory for VAT-registered businesses, but many sole traders don’t fall into that category. Importantly, these new changes do not affect how much tax you pay — only how information is recorded and submitted.

How do the MTD Changes Affect Sole Traders?

From April 2026, Making Tax Digital for Income Tax is set to apply to sole traders and landlords. This change will affect many self-employed plumbers and gas engineers across the country.

New Income Thresholds and Start Dates

MTD for Income Tax is being introduced in three waves:

From April 2026 — sole traders and landlords with annual income over £50,000 must follow MTD rules.

From April 2027 — the threshold drops to £30,000.

From April 2028 — the threshold drops again to £20,000, bringing almost every working heating and plumbing engineer into scope.

If your turnover is below these thresholds, these changes won’t apply to you yet — but HMRC has made it clear that thresholds may lower again in the future. Read more on the HMRC website.

What Will Making Tax Digital Require You to Do?

If you already run your business through Gas Engineer Software, this is simply a change in reporting. Those still primarily running their business on paper will need to change some core workflows. New requirements include:

Keeping digital records of income and expenses
Using MTD-compatible accounting software (Xero, QuickBooks, and Sage are all good options)
Submitting four quarterly updates to HMRC during the tax year
Submitting a Final Declaration at the end of the year, confirming your figures and any other income (savings, dividends, etc.)

This replaces the traditional “once-a-year” Self Assessment approach.

Above: Customers and invoices in Gas Engineer Software can automatically sync to your accounting software.

The new shape of your tax year

From April 2026, most heating businesses will send HMRC five things a year — four quarterly updates and one Final Declaration. Here’s how that breaks down.

Your tax year under MTD

Five submissions a year — at a glance

Four quarterly updates throughout the year, plus one Final Declaration after it ends.

Quarter 1

6 Apr – 5 Jul

Submit by

7 August

Quarter 2

6 Jul – 5 Oct

Submit by

7 November

Quarter 3

6 Oct – 5 Jan

Submit by

7 February

Quarter 4

6 Jan – 5 Apr

Submit by

7 May

+ then, after the tax year ends

✓

One per year

Final Declaration

Confirm your figures, claim allowances and reliefs, and report any other income. This replaces your old Self Assessment.

Submit by

31 January

HMRC also lets you elect for calendar quarter reporting (1 Apr–30 Jun, etc.) if that's easier — speak to your accountant about which suits you best.

How to Make the Change Simple and Straightforward

For most trades, the impact of MTD isn’t about learning tax rules — it’s about how organised your records are.

MTD makes it impractical to rely on paper or manual systems, and the quarterly reporting means missing invoices stand out sooner, late or forgotten payments cause more friction, and disorganised records create stress more often, not just once a year.

How Gas Engineer Software makes MTD easier

To comply with MTD, you’ll need two things:

MTD-compliant accounting software such as Xero, QuickBooks, or Sage.
A way to keep income and expense records digitally.

Gas Engineer Software helps with the second, providing an easy way to handle your invoices and track payments.

With the help of our accounting integrations, this data is then automatically transferred to your accounting software. From there, you can easily submit your quarterly reports and final tax statements.

What are the benefits of this system?

Gas Engineer Software doesn’t submit tax data to HMRC or replace your accountant. Instead, it helps keep your day-to-day business records organised at the source:

Jobs are logged properly
Invoices created as work is completed
Payments tracked against the correct jobs
Customer records kept consistent

When this data syncs automatically into your accounting software:

Quarterly updates are less disruptive
Fewer errors need fixing later
You or your accountant can work with clean, complete records

In short, it’s all about removing the chaos that makes tax stressful.

Get Ahead of Making Tax Digital

As a heating and plumbing businesses owner, you aren’t expected to become a tax expert. Rather, by keeping work, invoices, and payments organised, much of Making Tax Digital takes care of itself.

Existing Gas Engineer Software Pro Plan users can integrate with their accounting software in a matter of minutes. Click for guides on linking with Xero, Quickbooks, or Sage.