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Six conditions decide it and all six have to hold. Answer them and the page builds the invoice: the VAT shown but not added, the statement it has to carry, and the CIS deduction that comes off the same document.
This decides the rate, and the rate decides the second condition. Zero rated work is outside the reverse charge entirely.
Leave one unanswered and the page will not print a VAT figure. That is deliberate.
Not enough answered to decide
Charging VAT when the reverse charge applies is exactly as wrong as leaving it off when it does not, so no VAT figure is printed while a condition is open.
Still open: C1 (the supply is a construction operation within CIS scope); C3 (supplier and customer are both UK VAT-registered); C4 (the customer is CIS-registered / the payment is reported within CIS); C5 (the customer has NOT given written end-user or intermediary-supplier notification); C6 (the supplier is not an employment business supplying staff or workers).
C1. the supply is a construction operation within CIS scope
Not answeredIf it does not hold: normal VAT.
C2. the supply is standard-rated or reduced-rated; zero-rated supplies are outside DRC
HoldsIf it does not hold: normal VAT or zero rate.
C3. supplier and customer are both UK VAT-registered
Not answeredIf it does not hold: normal VAT.
C4. the customer is CIS-registered / the payment is reported within CIS
Not answeredIf it does not hold: normal VAT.
C5. the customer has NOT given written end-user or intermediary-supplier notification
Not answeredIf it does not hold: normal VAT — the supplier charges VAT.
C6. the supplier is not an employment business supplying staff or workers
Not answeredIf it does not hold: normal VAT.
Worked example
Standard-rated work for a VAT and CIS registered contractor who has not notified end user status: £4,000 of labour, £1,000 of materials, and you are verified for CIS at 20%.
Net value of the supply
£5,000.00
VAT you charge
£0.00
What lands in your bank
£4,200.00
This page runs the same engine the platform runs on a real invoice. Set the client up once, and every invoice to them decides the reverse charge from the answers on the record, stamps the statement, shows the VAT without adding it, and takes the CIS off the labour element.
When a customer sends end user notification, it goes on the client record as a document, and the invoices after it carry VAT again with the reason attached.
vat_liability_classes (GB) Published source Last read from the source 12 Aug 2026.drc_conditions (GB) Published source Last read from the source 12 Aug 2026.drc_result (GB) Published source Last read from the source 12 Aug 2026.drc_invoice_requirements (GB) Published source Last read from the source 12 Aug 2026.cis_deduction_base (GB) Published source Last read from the source 12 Aug 2026.vat_standard_rate (GB) Published source Last read from the source 12 Aug 2026.Construction VAT rate checker
Not every job is 20%. New dwellings are zero rated and a two-year empty home is 5%, with the conditions each rate depends on.
CIS deduction calculator
What a contractor withholds from your invoice at 20%, 30% and 0%, with materials and plant hire out of the base first.
Making Tax Digital countdown
Which MTD for Income Tax tranche catches you, the date it starts, and the days left.
Markup and margin calculator
The arithmetic solo contractors lose money on. 20% markup is not a 20% margin, and this shows you the gap in dollars.