The 19th doesn't move
Every month, a bookkeeper running CIS does the same grind. Pull each subcontractor's invoice. Read off the UTR and the verification number. Work out which part is labour and which is materials. Apply the right deduction rate — 20%, 30%, or 0% for gross-status subbies. Key it all in. Then do it again for the next subbie, and the next, across every contractor client — all racing the same hard HMRC deadline: the CIS300 return is due the 19th, every month, and a slip carries a penalty.
The maths was never the problem
CIS deductions aren't complicated once the data is in front of you. Labour is deductible, materials are exempt, and the rate depends on the subbie's status. The hard part — the part that eats evenings before the 19th — is the typing: lifting those numbers off a PDF, one field at a time, accurately, under deadline. That manual entry is slow, dull, and exactly where mistakes creep in.
What CISflow does
You forward a subcontractor invoice. CISflow reads it and pulls out the CIS fields — UTR, verification number, the labour/materials split, the deduction rate, the deduction amount, the net pay. It lays them out for you to check, and on your approval drops a clean, HMRC-ready CIS bill into Xero, or exports CSV for QuickBooks and your CIS300. The whole data-entry job, done — without the typing.
You review and own every figure. We just kill the typing.
Nothing is ever filed automatically. CISflow extracts and proposes; you check and approve. It's a data-entry tool — not your accountant — and accountability for what reaches HMRC stays where it belongs: with you.
New, and built in the open
We'll be straight with you: CISflow is brand-new. We have no customers yet, and we're not going to dress the place up with fake testimonials or logos to pretend otherwise. We're building it alongside the bookkeepers it's for — shipping early, listening hard, and showing the work as it happens. Early members lock in the founding price and genuinely shape what gets built next.
How we treat your clients' data
Bookkeepers are fiduciaries, so we hold their data to that standard. Raw uploaded invoices aren't kept as a permanent archive; the extracted CIS records are stored in our UK-region (London) database under UK GDPR, encrypted and isolated to your account. To read the figures, invoice content is sent to OpenRouter, a US-based AI provider, for the extraction step — we disclose this openly. Where a certification isn't yet held, we say so plainly rather than imply it. The full detail — sub-processors, what's retained, your rights — is on our privacy page.
No card. Free to start. Built in the open.