For UK builders & contractors

CIS invoices, subbies and expenses — handled by WhatsApp

Message Amy and she writes the CIS invoice with the right deduction, puts the PO on it, keeps your subcontractor records and turns a photo of a receipt into a categorised expense. Your own number, nothing new to learn.

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A contractor invoice and a merchant receipt, in one go

Two messages between the site gate and the main road.

CIS invoice for Taylor Wimpey, £8,500 gross, PO 4471
A
CIS invoice created for Taylor Wimpey — Gross £8,500, 20% deduction £1,700, Net £6,800, PO 4471 on the invoice. Email it?
yep. and a photo of the Travis Perkins receipt 📷
A
Logged £214.60 from Travis Perkins — materials, filed under the right MTD category. Kept on file for your accountant.

Built around builders' jobs

CIS deductions at 0 / 20 / 30%

Tell Amy the gross and the rate and she calculates the deduction and net, stores all three, and adds the contractor PO number to the invoice.

Subcontractor & PO records

Every CIS invoice keeps the gross, deduction, net and PO together, so the subbie paperwork is straight when the contractor or HMRC asks.

Materials from a photo

Snap the Travis Perkins or Screwfix receipt, send it on WhatsApp, and Amy reads it, categorises it and files it as an expense.

The trail a contractor's accounts team will ask for

Main contractors query things months later, and HMRC queries them years later. This is what's sitting there when they do.

Gross, deduction, net — kept apart

All three figures stored separately against every CIS invoice, so when a contractor's monthly statement disagrees with your records you can see exactly where, instead of arguing from memory.

The PO number, on the invoice

Most contractor payment runs won't touch an invoice without the purchase order on it. Give Amy the PO and it's printed on the document and kept with the record.

Materials against the right job

Receipts photographed on the day get categorised and filed, so the materials on a job are visible next to what you invoiced for it.

Subcontractor payments out

What you've paid other people, recorded as you pay it — the other half of CIS, and the half that's hardest to reconstruct at year end.

Mileage across sites

Multi-site weeks generate serious mileage that mostly goes unclaimed. Logged at the HMRC rate as you tell her about it.

The records CIS demands, without a CIS admin day

Building work under CIS carries a paperwork load that homeowner work simply doesn't — deductions to evidence, POs to quote, subbies to account for, and two different sets of people who might ask about any of it. That's not accounting, it's record-keeping, and it's the part that gets left until it's a problem. TradesOffice captures it at the point it happens, on site, in a message. Your accountant keeps doing the accounts; they just stop having to ask you what the £8,500 in March was for. £19.99 a month.

Common questions

Does it do CIS deductions?

Yes. Tell Amy the gross and the rate (0%, 20% or 30%) and she works out the deduction and net, records all three, and can add the contractor PO number to the invoice.

Can it store the contractor PO number?

Yes — give Amy the PO (for example "PO 4471") and it is printed on the CIS invoice and kept with the record.

Can I log material receipts?

Yes. Photograph the receipt and send it on WhatsApp; Amy reads the supplier and amount, categorises it to the right HMRC expense category, and files it.

Do I need an app or a new number?

No. TradesOffice runs on your existing WhatsApp number — nothing new to set up and nothing to learn. There's a dashboard behind it if you want to look something up, but you never have to open it.

Is this accounting software?

No. It is the layer before accounting: clean, categorised records captured as you work, ready for your accountant to file from.

Put next week's CIS invoices on autopilot

Save Amy as a contact, send her the first one from site, and see the deduction worked out for you. 14 days free, no card.

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