HMRC and CIS Returns: FAQ for Subcontractor Drivers
HMRC treats your CIS (Construction Industry Scheme) deductions and your driving or delivery income as two strands of the same Self Assessment return. This FAQ explains how the two fit together, what HMRC letters mean, and how to claim back what you're owed.
Published 25 September 2026 · Updated 25 September 2026
If you carry out construction work under the Construction Industry Scheme and also drive for Uber, Bolt or a delivery platform, **HMRC CIS returns** for drivers can feel like two tax systems bolted together. This FAQ answers the questions we hear most from subcontractors who split their week between a building site and a private hire or courier app, covering deductions, refunds and the letters HMRC sends when something doesn't add up.
Key takeaways
- CIS deductions only apply to construction payments; driving and delivery income is never taxed at source, so you must set money aside separately.
- Both income streams go on one Self Assessment return, and HMRC offsets your CIS deductions against your total tax and Class 4 National Insurance bill, not just the construction share.
- A CIS statement comes from your contractor, not HMRC; an HMRC compliance check letter is different and needs a prompt, evidenced reply.
- Gross payment status is assessed on your CIS turnover and compliance record and is not affected by having driving income too.
- Keep CIS statements and driving records separately but file them together, because HMRC can ask for either when reviewing a refund.
What is the Construction Industry Scheme for a driver-subcontractor?
The Construction Industry Scheme (CIS) is a system where contractors deduct tax in advance from payments to subcontractors doing construction work, and pass it to HMRC. If you also drive for a platform, CIS only ever applies to the building-related income; your driving profit sits outside it entirely, taxed only through your annual Self Assessment bill.
How does HMRC treat CIS deductions when you also drive for Uber?
HMRC treats you as one taxpayer with two self-employment income streams reported on a single Self Assessment return. Your CIS deductions are recorded against your total tax bill for the year, not ring-fenced to the construction work alone, so a large CIS deduction can effectively cover tax owed on your driving profit too.
According to HMRC's guidance on the Construction Industry Scheme, contractors deduct money from a subcontractor's payments and pass it to HMRC as an advance payment towards tax and National Insurance (gov.uk/what-is-the-construction-industry-scheme). For the 2026/27 tax year, that deduction sits alongside, not instead of, the tax due on any Uber, Bolt or delivery earnings you declare on the same return.
Why the two income streams are reported together
Self Assessment calculates one combined figure for your Income Tax and Class 4 National Insurance across all self-employment, then deducts everything already paid, including CIS deductions, PAYE from any employment, and payments on account. Reporting the two trades separately on your return (construction income under CIS rules, driving income as ordinary self-employment) keeps HMRC's calculation accurate and reduces the chance of a mismatch query.
What CIS deduction rate applies to a subcontractor driver?
The rate depends on your CIS registration status with contractors, not on the fact you also drive. Registered subcontractors have 20% deducted, unregistered subcontractors have 30% deducted, and those with gross payment status have 0% deducted, with none of this affected by separate driving income.
HMRC confirms these three rates directly: "The Construction Industry Scheme (CIS) deduction rates are: 20% for registered subcontractors, 30% for unregistered subcontractors, 0% if the subcontractor has 'gross payment' status" (gov.uk, Make deductions and pay subcontractors). Before a contractor pays you, they must verify your CIS status with HMRC, which is what sets your rate (gov.uk, Verify subcontractors).
| Status | Deduction rate | Effect on driving income |
|---|---|---|
| Registered subcontractor | 20% | None directly; driving income stays untaxed at source |
| Unregistered subcontractor | 30% | Higher deduction can create a larger refund once both incomes are combined on your return |
| Gross payment status | 0% | No CIS deduction at all; you must budget for tax on both incomes yourself through payments on account |
How do you claim a CIS refund when you also have driving income?
You claim by filing one Self Assessment return that reports your CIS income and deductions alongside your driving or delivery profit as a separate self-employment entry. HMRC works out your total liability across both, subtracts your CIS deductions, and refunds the difference if you've overpaid, usually a few weeks after you file online.
Most subcontractors reclaim CIS tax when they submit their Self Assessment return, and any difference between deductions already made and the actual tax and National Insurance owed becomes a refund or a balance due. Because your driving profit adds to the total tax calculation, keeping accurate figures for both trades directly changes the size of your refund.
How to file a CIS return alongside driving income: step by step
- Gather every CIS statement from each contractor covering the tax year, showing gross payment, materials and tax deducted.
- Pull your driving or delivery figures separately: platform tax summaries, mileage log, and any other allowable expenses.
- Register for Self Assessment by 5 October if this is your first year needing to file, using the GOV.UK online service.
- Complete the self-employment (SA103) pages for your construction trade, entering CIS deductions in the box provided.
- Complete a second self-employment section (or combined turnover entry, if it's genuinely one business) for your driving income and expenses.
- Check the calculation HMRC provides before submitting; it should show your CIS deductions offset against the combined tax bill.
- File online and pay any balance, or receive your refund, by the 31 January deadline shown on GOV.UK's Self Assessment deadlines page for the relevant tax year.
What does an HMRC letter about CIS actually mean?
Most paperwork you receive about CIS deductions comes from your contractor, not HMRC directly. A CIS statement is the contractor's monthly record of what they paid you and deducted; it's your proof of tax already paid, and you should keep every one to support your Self Assessment figures.
CIS statements versus HMRC compliance check letters
A genuine letter from HMRC is different: it might confirm your Self Assessment calculation, request more information, or open a compliance check into a refund claim. HMRC runs routine checks on returns showing a refund, especially where CIS deductions look high compared with declared profit, so having both trades' records ready in advance avoids delay if a check arrives.
How to respond to an HMRC compliance check
Read the letter carefully for the exact documents requested and the deadline given, which is usually 30 days. Send clear copies of CIS statements, contractor invoices, and driving records such as your mileage log or platform statements, and reply in writing so there's a record of what you sent and when.
Worked illustrative example
This is an illustrative example using an invented subcontractor, not a real client. Priya is a registered CIS subcontractor who also drives for a delivery platform two evenings a week. Over the 2026/27 tax year she earns £24,000 from construction work, with contractors deducting 20% (£4,800) under CIS. She also earns £6,000 profit from delivery driving, on which no tax has been deducted.
Her combined self-employment profit for the year is £30,000. After deducting her personal allowance and applying Income Tax and Class 4 National Insurance to the remainder, her total liability comes to roughly £4,100 (figures rounded; check the current Income Tax rates and National Insurance thresholds on GOV.UK, since exact bands can change). Because she's already had £4,800 deducted under CIS, HMRC refunds the difference of about £700 once her return is processed, an amount that reflects both trades combined, not the construction work alone.
Common mistakes CIS subcontractor drivers make with HMRC
Filing driving income under the wrong section, or forgetting it entirely because "the CIS deductions already cover it", is one of the most frequent errors we see. HMRC treats undeclared self-employment income as a failure to notify, which can trigger a penalty of up to 100% of the tax due on top of the tax itself, alongside interest.
Losing CIS statements is another common problem. Without them, you can't evidence tax already deducted, and HMRC may query or delay your refund while you chase duplicates from contractors. Missing the 5 October registration deadline for a first Self Assessment return can also mean a late-filing penalty even before you've claimed anything back, so register as soon as you know you'll need to file.
Key terms
- CIS: Construction Industry Scheme, where contractors deduct tax in advance from subcontractor payments.
- UTR: Unique Taxpayer Reference, the 10-digit number HMRC issues when you register for Self Assessment.
- NIC: National Insurance Contributions; self-employed profit above the threshold is subject to Class 4 NIC.
- SA103: the self-employment supplementary pages attached to your Self Assessment tax return.
- Gross payment status: CIS status letting a contractor pay you without any deduction, based on turnover and compliance checks.
How Uber Driver Accountant helps
We're an independent practice for Uber, Bolt, private hire and delivery drivers, not affiliated with or endorsed by any platform. If you also work under CIS, our CIS returns service reconciles your contractor deductions against your driving profit on one Self Assessment return, so nothing is missed and your refund reflects both trades. Fees start from £20 a month, fixed, with no surprise bills if HMRC opens a query.
If your CIS work sits alongside general Uber tax questions, our guide to HMRC and your Uber tax return covers the driving side in more depth, and our mileage log and record-keeping guide explains what HMRC expects from your driving records specifically. Our tax calculator can also give you a rough combined estimate before you file.
Conclusion
Running CIS construction work alongside driving or delivery income means two sets of records feeding into one Self Assessment return, and HMRC's refund calculation only works properly when both are complete. Keep every CIS statement, log your driving income and expenses separately, and reply promptly if HMRC writes to check your figures. If you'd rather hand the reconciliation to someone who does it daily, get in touch and we'll take it from here.
Last reviewed 25 September 2026 by the Uber Driver Accountant tax team.
This article is general information, not personal tax advice. Every subcontractor's circumstances differ, so speak to a qualified accountant before acting on it, and where HMRC disputes or penalties are involved, professional representation is strongly recommended.
Questions drivers ask about this
Would you rather not think about any of this?
That is exactly what we are for. Send us your Uber statements and we will handle the return, the quarterly updates and the deadlines — and tell you honestly if there is a better way for you to be set up.
