For self-employed plumbers

MTD for Income Tax for plumbers.

Emergency call-outs, cash jobs, materials markup and a van full of tools. Here's how Making Tax Digital for Income Tax applies to plumbers, what records you need, and when it starts for you.

Does this apply to me?

If you turn over more than £50,000, it applies now.

MTD for Income Tax is measured on gross income, your total takings before expenses. Once marked-up parts pass through your invoices, plumbers cross £50,000 sooner than they expect.

Live now
£50,000
Gross income from April 2026
£30,000
Threshold from April 2027
£20,000
Threshold from April 2028
Cash still counts

Every job goes in the records, cash included.

Emergency call-outs paid in cash are taxable income just like a carded job. The upside of digital records is that logging a payment on your phone the moment you're paid means nothing slips through by the end of the quarter.

What records you need
What's changing

Digital records, four quarterly updates, one final declaration.

Your annual Self Assessment return is replaced by four short quarterly updates and a year-end final declaration, all through recognised software.

Expenses to keep digital

  • Van, fuel and running costs
  • Tools and equipment
  • Materials and parts from the merchant
  • Public liability insurance and workwear
  • Gas Safe registration, if you do gas work
  • Training and ongoing qualifications

Snap merchant receipts on the app as you buy, so a parts run doesn't turn into paperwork at quarter-end.

  • Emergency call-outs Cash and card, logged as you're paid
  • Materials markup Charged parts in, bought parts out
  • Fixed price vs day rate Both totalled into one quarterly update
The plumber detail

The bits specific to your trade.

Materials markup

The parts you buy and recharge flow through your takings. Record what you charge and what you paid so you're taxed only on the difference.

Cash call-outs

Late-night emergency jobs are still taxable income. Log them on the app on the doorstep and your records stay complete.

Van and tools

Fuel, servicing, tools and replacement kit are all deductible. Keep them logged and your expense total stays accurate.

Gas Safe overlap

Also doing gas work? The registration fee is a business expense, and it all sits in one set of records. See our gas & heating engineers guide.

Why Clear Books

Built for the van, not the office.

You're under a sink, not sat at a desk. Clear Books lets you keep records from your phone and gives HMRC exactly what they need, nothing you don't.

  • Log call-outs and cash jobs the moment you're paid
  • Snap merchant receipts for parts on the spot
  • Record materials markup so you're taxed on profit
  • Send HMRC-compliant quarterly updates in minutes
  • CIS support if you subcontract on construction sites
  • Free plan available, no timer
The Clear Books MTD for Income Tax submissions screen showing four quarterly updates submitted to HMRC
Q1 update submitted
HMRC recognised
Common questions

Plumber MTD FAQ.

Do plumbers have to use MTD for Income Tax?
Yes, if you're a self-employed plumber with gross income over £50,000, it applies from 6 April 2026. The threshold drops to £30,000 from April 2027 and £20,000 from April 2028.
How do I record cash call-out jobs?
Cash jobs are taxable income and must be in your digital records. Log the payment in the app as soon as you're paid so nothing is missed at quarter-end.
How is materials markup treated?
The full amount you charge, labour plus marked-up parts, is your income. The parts you buy are an expense, so you're taxed on the profit. Recording both keeps your quarterly figures right.
What can I claim as a plumber?
Typical costs include your van and fuel, tools, materials and parts, public liability insurance, workwear, and Gas Safe registration if you also do gas work.
I do some Gas Safe work too, does that change anything?
No. It's all self-employed income under one set of records. If you're Gas Safe registered, the registration cost is a deductible expense you record like any other.
Free for sole trader plumbers

Keep your books straight from the van.

Log jobs and parts as you go, snap your receipts, and send your first quarterly update in minutes.