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Plumbing quote calculator: VAT and CIS

See the quote your customer pays and the money that lands in your account. VAT, the domestic reverse charge and CIS at 20% or 30% are worked out for you.

The job

Materials

Tax

Quote total
Quote total

What goes on the invoice

Labour
Call-out charge
Materials (with markup)
Subtotal before tax
VAT 20%
VAT under reverse charge (customer pays HMRC, not you)
CIS deduction
You receive after CIS
Deposit to ask for
See the Plumber Kit

Rounded to the cent line by line. A guide, not tax advice.

How it works

  • Labour = hours × people × hourly rate, plus any out-of-hours uplift. Materials = your cost × (1 + markup).
  • VAT at 20% is added if you are VAT registered.
  • Reverse charge: on CIS work for a VAT-registered contractor who is not the end user, you do not charge the VAT. The contractor accounts for it to HMRC, so the invoice total excludes it.
  • CIS is deducted from everything except VAT and the cost of your materials. Your markup on materials counts as labour for CIS, so it is deducted from too.

You must register for VAT once your taxable turnover passes £90,000 in any rolling 12 months. CIS only applies when a contractor pays you for construction work, including plumbing and heating; a homeowner paying for their own house is never a CIS contractor. A contractor who deducts CIS must give you a payment and deduction statement, and that deduction counts towards your tax bill.

Three worked examples

Each one was checked against an independent calculation. Type the same numbers above and you will get the same results.

Example 1

Homeowner job, VAT-registered plumber

Labour3 h × 1 × £55.00
Materials£210 + 20% markup
VAT / CISVAT registered
Subtotal£417
VAT£83.40
Quote total£500.40

Example 2

First fix for a builder: CIS 20% and reverse charge

Labour16 h × 2 × £32.00
Materials£380 + 15% markup
VAT / CISVAT registered, reverse charge, CIS 20%
Subtotal£1,461
VAT (customer pays HMRC)£292.20
Quote total£1,461
CIS deducted£216.20
You receive£1,244.80

Example 3

Not VAT-registered subcontractor, CIS 20%

Labour8 h × 1 × £30.00
Materials£150 + 10% markup
VAT / CISNot VAT registered, CIS 20%
Subtotal£405
Quote total£405
CIS deducted£51.00
You receive£354

UK (VAT, CIS)

Now do it for every job.

£25

  1. Plumber Quote, Invoice & Price Book
  2. Combi & Hot Water Upgrade Quote (Good / Better / Best)
  3. Plumbing Parts & Van Stock Catalogue
  4. Landlord Gas Safety Record (CP12) Tracker

4 spreadsheets · Excel and Google Sheets · blank, filled example and printable PDF

Get it nowSee what you get

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Questions

Is CIS deducted from materials?

Not from what the materials cost you. HMRC lets the contractor leave out the cost of materials, and VAT, before working out the deduction. Any markup you add on materials is treated as labour, so CIS is taken from that part.

When does the domestic reverse charge apply?

When you are VAT registered, the job is CIS-reportable, and your customer is a VAT-registered contractor who is not the end user. You write "Reverse charge: customer to account to HMRC for the VAT" on the invoice instead of charging VAT.

What if I have gross payment status?

Pick the 0% option. With gross payment status the contractor pays you in full and you settle tax through Self Assessment or Corporation Tax.