SUBCONTRACTORREGISTRATIONUK.
If you're working in construction and being paid by another contractor, you need to be registered for CIS so the deduction rate is 20% rather than the unregistered 30%. Registration takes about ten working days from a clean application — but you also need a UTR (issued by HMRC after self-employment registration), and if you're trading as a limited company you need that company structure in place first. We match you with construction accountants who handle the whole sequence: self-employment, UTR, CIS subcontractor registration, and where the turnover supports it, a gross payment status application straight after.
WHAT CIS SUBCONTRACTOR REGISTRATION ACTUALLY INVOLVES
Step one is self-employment. If you've never been self-employed before, you register with HMRC for self-assessment, and that triggers the issue of a Unique Taxpayer Reference (UTR). The UTR is the ten-digit number that identifies you across every HMRC tax service — without it, CIS verification fails and any contractor who pays you has to deduct at 30% rather than 20%. Sole traders register through the HMRC self-assessment registration form online; partnerships register the partnership and each individual partner; limited companies use the SA1 (or company UTR comes through automatically when the company is incorporated, but the directors still need their personal UTRs separately).
Step two is the CIS subcontractor registration itself. Once the UTR is live, registering as a CIS subcontractor is done online through HMRC's CIS service — it confirms to HMRC that you're going to be paid as a construction subcontractor and asks how you want to be paid: under deduction (20%) or, if you qualify, under gross payment status (0%). First-time registrations usually go in for under deduction because the gross payment status compliance test needs twelve months of clean filing history that a brand-new subcontractor doesn't have yet.
Step three is verification, which is technically the contractor's responsibility but often falls into a registration vacuum. The contractor who's about to pay you for the first time has to verify your CIS status with HMRC — they enter your UTR, your name, your trading name (if any), and either your National Insurance number (sole trader) or company registration number (limited company). HMRC matches you to your records and tells the contractor what rate to deduct. If anything in those details is misaligned (the trading name on the verification request not matching the trading name on your CIS registration is a common one), HMRC fails the match and the contractor is told to deduct at 30%.
For limited company subcontractors there's an extra layer: you incorporate the company first (Companies House, takes 24-48 hours), the company gets its own UTR for corporation tax (issued automatically by HMRC about two weeks after incorporation), and then you register the company for CIS as a subcontractor using the company's UTR — not your personal one. The personal UTR you used as a sole trader doesn't carry across, and we see new directors mistakenly verify the company against their old sole-trader UTR all the time, which fails verification.
Construction Industry Scheme registration is independent of self-assessment. Even after you're registered for CIS, you still file your own self-assessment annually (sole traders) or your CT600 corporation tax return (companies) to claim the CIS suffered against your final tax bill. CIS deductions are payments on account, not a final tax — they sit in HMRC's name for you and only crystallise when your annual return reconciles them. Subcontractors who don't file self-assessment leave money in HMRC's hands.
SUB-CASES THAT ADD TIME OR COST
Gross payment status applications run alongside or after CIS subcontractor registration. The qualifying turnover threshold is £30,000 for individual sole traders, partners, and company directors; or £100,000 net of materials for a limited company itself when there are multiple working directors. The compliance test (twelve months of clean PAYE, CIS, VAT, self-assessment, and corporation tax) is the bottleneck for new subcontractors — by definition, you don't have twelve months of CIS history if you're registering for the first time. Most accountants advise registering under deduction first, building twelve months of clean filing, then applying for gross payment status. The application takes four to six weeks.
Reverse charge VAT registration overlaps for VAT-registered subcontractors. If your turnover crosses the VAT registration threshold (£90,000 from April 2024, was £85,000 before that) and you're supplying construction services to another VAT-registered contractor, the reverse charge applies — your invoice doesn't include VAT, the customer accounts for it. New subcontractors who skip VAT registration when they should have registered end up with backdated VAT bills plus penalties; new subcontractors who register too eagerly into the reverse charge mechanism without understanding it end up with broken cash flow. Worth doing the registration with construction-specific advice rather than a generalist who'll process it as a normal VAT case.
Registering as both contractor and subcontractor is common — a working subcontractor who hires their own labour is a contractor for CIS purposes too. You have to register as both. Two separate CIS registrations against your one UTR; two separate sets of obligations: monthly CIS300 returns for the people you pay, plus claiming CIS suffered on your own self-assessment for the people who paid you. Sole-trader subcontractors who scale up rarely realise the contractor side has to be registered separately and end up with backdated penalties.
Deregistering as a subcontractor matters if you stop construction work — the CIS registration doesn't auto-close, and HMRC can keep verifying your status against records that no longer reflect your activity. We've seen subbies who moved into a different trade five years ago still being verified by old contractors who got hold of their UTR. Notify HMRC formally when CIS work ends; clean closure prevents the awkward "I haven't worked construction in three years but I'm getting paid 20% deductions" situations.
Foreign nationals working construction in the UK need a UK National Insurance number before CIS registration — and the NI number application has its own queue. EU citizens with pre-settled or settled status, Irish citizens, and skilled-worker-visa holders all qualify, but the NI number application can take 4-8 weeks. The CIS registration can't complete until the NI number is issued. Worth budgeting for the queue at the start, especially for site-ready trades being onboarded against a deadline.
HOW SUBCONTRACTOR REGISTRATION PLAYS OUT IN PRACTICE
Bricklayer, previously employed PAYE, going self-employed for the first time with a contract starting in two weeks. We registered him for self-assessment (UTR issued in 8 working days), then registered the UTR for CIS subcontractor status (live within 48 hours of UTR). His first contractor verified him on day 11 and he was paid at 20% on his first invoice. Without the registration, he'd have been paid at 30% — the difference on his first month's £8,000 of labour was £800 in cash flow.
Three-year sole trader plasterer with growing turnover (£140,000) wanted to incorporate. We set up the new limited company, registered the company for CIS as a subcontractor against the new corporation tax UTR, and started a new gross payment status application using the personal directorship trading record (so the compliance test pulled his clean three-year sole-trader history). GPS approved nine weeks after incorporation. He kept the sole trader UTR open for one final tax year to claim the CIS suffered before the switch.
Carpenter who'd been a CIS subcontractor for five years started taking on his own subbies on a £180k loft conversion job. We registered the same UTR as a CIS contractor (separate registration), set up monthly CIS300 filing, verified the three new subbies he was paying, and reconfigured his bookkeeping so the contractor and subcontractor sides reconciled cleanly at year-end. First month's CIS300 filed on day 19; no penalties.
CITIES WE COVER
Subcontractor registration looks different by city — partly because of the trade mix, partly because of how the local construction sector sources labour:
Subcontractor Registration:Common Questions
Yes. The UTR is the ten-digit reference HMRC uses to identify you across every tax service, and CIS verification fails without it. Sole traders get a UTR by registering for self-assessment (about 8-10 working days for a clean application). Limited companies have a separate company UTR that's issued automatically a couple of weeks after incorporation. Without the UTR, any contractor paying you has to deduct at 30% as an unmatched payment.
About ten working days end-to-end if you're starting from a UTR you already have. The UTR step itself adds another 8-10 working days for new self-assessment registrations. The CIS-side registration is fast (24-48 hours of HMRC processing once the UTR is in place); most of the wait is the underlying self-employment registration.
Usually no, not on day one. The compliance test for gross payment status looks back twelve months at your PAYE, CIS, VAT, self-assessment, and corporation tax history. A brand-new subcontractor doesn't have that history yet, so the application gets refused on the test. Standard practice is to register under deduction (20%), build twelve months of clean filing, then apply for gross payment status once the test will pass.
They're different registrations. Self-employment registration with HMRC tells them you're going to file self-assessment returns and pay income tax and National Insurance on profits — that's where the UTR comes from. CIS subcontractor registration tells them you're going to be paid by other contractors under the Construction Industry Scheme so they should match you to a 20% rather than 30% deduction. You need both. Self-employment first (because CIS needs the UTR), then CIS.
The company registers, against its corporation tax UTR. The company is the legal entity being paid, so the company's details (UTR, registered name, registration number) are what contractors verify against HMRC. Your personal UTR as a director isn't the right reference for company-level CIS payments. New directors mistakenly verify their company against their old sole-trader UTR and the verification fails — common enough that it's worth flagging upfront.
Yes, if your visa allows self-employment or working as a subcontractor (skilled worker, pre-settled / settled status, Irish citizen, and most other categories). You need a UK National Insurance number first — application is separate from CIS and currently takes 4-8 weeks depending on demand. CIS registration can't complete until the NI number is issued and used to register self-employment.
It doesn't close itself. HMRC can keep verifying your status against records that don't reflect your current activity, which can lead to old contractors paying you against an out-of-date status. The clean approach is to formally deregister as a CIS subcontractor when you change trade or stop construction work — same online service, takes 24-48 hours, and prevents weird verification mismatches years later.
Yes — and this is where most overpaid CIS sits unreclaimed. CIS deductions are payments on account against your final tax liability, not a final tax. You file self-assessment annually as a sole trader (or your company files CT600 if you're incorporated) and claim the CIS suffered against the income tax, National Insurance, or corporation tax actually due on your profits. If your CIS deductions exceed the tax due, the difference is refunded. Subcontractors who skip self-assessment leave that refund with HMRC.