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CIS Compliance: 10 Things You Should Know Before HMRC Steps In

  • Jul 2
  • 5 min read

By Jessica

If you’re running a construction business in the South East of England: whether you're a brickie in Bexley or a developer in Dartford: you’ve likely heard the dreaded acronym: CIS.

The Construction Industry Scheme (CIS) is HMRC’s way of making sure everyone in the building trade pays their fair share of tax. But for many SMEs, it feels more like a mountain of paperwork waiting to collapse. HMRC isn't exactly known for its sense of humour when it comes to mistakes, and the penalties for getting it wrong can be eye-watering.

At Accountant Search, we talk to businesses every day that are terrified of an HMRC audit. The good news? CIS compliance doesn't have to be a nightmare. Even though we help connect you with local accountants in London and across the South East, the modern way of working means location doesn’t really matter anymore. We handle everything virtually using OneDrive and video calls, so you can stay compliant from your sofa (or the site cabin).

Here are 10 essential things you need to know about CIS compliance before HMRC comes knocking.

1. Are You a Contractor, a Subcontractor, or Both?

The first step is knowing where you stand. In the eyes of HMRC:

  • Contractors: You pay people to do construction work.

  • Subcontractors: You do the work and get paid by a contractor.

Many SMEs in the South East find themselves in both camps. You might take on a large contract for a new build in Dartford (acting as a subcontractor) but then hire a specialist plumber to help finish the job (acting as a contractor). If this is you, you need to register as both.

2. You Must Register Before You Pay Anyone

One of the biggest mistakes we see is businesses hiring help and then trying to sort the tax later. You must register for CIS with HMRC before you make your first payment to a subcontractor. If you’re a limited company accountant or a sole trader, the registration process is slightly different, so make sure you’ve got your UTR (Unique Taxpayer Reference) and company details ready.

Managing CIS compliance virtually via video calls and OneDrive

3. The "Verification" Rule is Non-Negotiable

You can’t just guess how much tax to take off a subcontractor’s pay. Before you pay them, you have to "verify" them with HMRC. This tells you their current tax status and exactly what percentage you need to deduct.

If you fail to verify a subcontractor and just pay them the full amount, HMRC will hold you liable for the tax that should have been deducted. It’s a quick way to lose thousands of pounds in a single project.

4. Know Your Deduction Rates (0%, 20%, or 30%)

HMRC uses three main rates for CIS:

  • 20%: The standard rate for subcontractors who are registered but don’t have gross payment status.

  • 30%: The higher rate for those who aren’t registered or couldn’t be verified.

  • 0% (Gross Payment Status): The holy grail. The subcontractor gets paid in full and handles their own tax later.

If you’re unsure which rate applies, it’s always best to check with a professional who handles tax preparation services.

5. Don’t Deduct Tax on Materials

CIS deductions only apply to the labour part of the invoice. If a subcontractor charges you £1,000 for labour and £500 for materials, you only apply the 20% or 30% deduction to the £1,000.

You also need to exclude VAT and certain equipment hire costs. Getting this calculation wrong is a massive red flag for HMRC. We recommend using a shared OneDrive folder where you can upload invoices instantly, allowing your accountant to double-check these splits in real-time.

6. Monthly Returns are Mandatory (and Strict)

Contractors must submit a monthly CIS return to HMRC. This return lists every payment you’ve made to subcontractors and how much tax you’ve deducted.

The deadline is the 19th of every month (if filing by paper) or the 22nd (if filing electronically). Miss it by even one day, and you’ll get an automatic £100 penalty. Miss it by six months? That penalty could jump to £3,000 or more.

A checklist for HMRC CIS compliance and construction tools

7. You Must Give Subcontractors a Statement

It’s not enough to just deduct the money; you have to prove it. You are legally required to give each subcontractor a written "payment and deduction statement" every month. This statement is vital for them because they’ll use it to offset those deductions against their own tax bill at the end of the year.

If you’re struggling with the admin of generating these, our payroll services can automate the entire process for you.

8. Beware the "Deemed Contractor" Rule

Think you’re safe because you aren’t a construction company? Think again. If your business spends more than £3 million on construction in any 12-month period (even if you’re a retail chain or a private school), HMRC classifies you as a "deemed contractor." This means you have to follow all the same CIS rules as a builder.

9. Gross Payment Status: Use It or Lose It

If you’re a subcontractor, having Gross Payment Status (GPS) is fantastic for your cash flow because you get 100% of your money upfront. However, HMRC is very protective of this status. If you are late with a single VAT return or make a mistake on your Self-Assessment, they can: and will: strip you of your GPS.

Staying on top of your bookkeeping services is the only way to protect your status.

10. CIS is Moving Digital (and Virtual)

HMRC is pushing hard on "Making Tax Digital" (MTD), and CIS is part of that shift. The days of keeping receipts in a shoebox are over.

Whether you’re looking for accountants in Bexley or anywhere else in the South East, the best way to manage CIS is virtually. We provide all our services via OneDrive and video calls. This means:

  • Instant Access: No more driving to an office to drop off paperwork.

  • Better Security: Your financial data is encrypted and backed up.

  • Location Independence: You get the best tax advice regardless of where your site is located.

Map of the South East of England highlighting virtual accounting connections

Why Choose a Virtual Accountant for Your SME?

We focus on the South East of England because we know the local market, but we’ve embraced the virtual model because it’s simply better for our clients. Construction is a fast-moving industry. You’re on-site, you’re dealing with suppliers, and you’re managing teams. You don’t have time to sit in traffic for a 15-minute meeting with an accountant.

By using video calls and shared digital folders, we can verify your subcontractors in minutes and ensure your monthly returns are filed long before the deadline.

Final Thoughts

HMRC's CIS rules are designed to be strict, but they don't have to be a burden. By staying organized, verifying your team, and using modern digital tools, you can keep your focus where it belongs: on building your business.

Ready to take the stress out of your CIS compliance? Find an accountant who understands the construction industry and the power of virtual working today.

 
 
 

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