Introduction
If you run your own limited company in the construction industry, you’ve likely come across the Construction Industry Scheme (CIS). It’s HMRC’s way of ensuring tax is paid correctly by contractors and subcontractors but when you’re trading as a limited company, the rules can feel a little more complex.
In this article, we’ll break down the key CIS limited company rules, explain how deductions affect your business cash flow, and show how you can claim a CIS tax refund for limited companies efficiently.
What is the CIS for limited companies?
Under the Construction Industry Scheme (CIS), contractors deduct money from subcontractor payments and pass it to HMRC. These deductions count as advance payments towards the subcontractor’s tax and National Insurance.
When operating as a limited company, you can be both:
- A contractor – paying other subcontractors and making CIS deductions.
- A subcontractor – working for a main contractor who deducts CIS from your payments.
Need a refresher on how CIS rebates work? See our guide to CIS tax rebates for subcontractors for full details.
CIS registration for limited companies
If your company operates within the construction industry, you must register with HMRC before you start trading. Here’s how:
- Register your company for CIS through HMRC.
- Provide your UTR (Unique Taxpayer Reference) and company details.
- Contractors must verify each subcontractor before making payments.
Unregistered subcontractors are taxed at a higher rate of 30%, while registered ones pay 20%. So registration is essential for cash flow.
How CIS deductions affect limited companies
When a contractor pays your company, they’ll typically deduct 20% CIS tax from your invoice total (excluding VAT).
For example:
| Example | Amount (£) |
|---|---|
| Invoice total (excluding VAT) | 2,000 |
| CIS deduction (20%) | 400 |
| Payment received | 1,600 |
These deductions are reported on your CIS deduction statements keep these safe, as they’re vital for reclaiming your overpaid tax later.
Claiming a CIS tax refund as a limited company
Here’s how the CIS rebate process works for limited companies:
The CIS suffered (deducted from your pay) is claimed each month through your company payroll. At the end of the tax year, any remaining overpayment is offset against your Corporation Tax bill. If there’s still an amount left after this, HMRC will issue a refund.
Filing your Self Assessment or company tax return accurately ensures HMRC releases your refund quickly. Working with a specialist like Tax2u can make sure every deduction is accounted for properly.
Common CIS mistakes limited companies make
Even experienced contractors and directors slip up when it comes to CIS compliance. Here are some of the most frequent issues we see:
- Not registering for CIS before trading.
- Missing CIS statements or failing to record deductions.
- Overlooking allowable business expenses.
- Mixing PAYE and CIS records incorrectly.
Each of these can delay your refund or trigger HMRC queries.
Final thoughts
The CIS rules for limited companies might seem complicated at first, but with accurate bookkeeping and the right setup, they can work smoothly in your favor. Staying registered, tracking deductions, and filing on time ensures your company remains compliant and helps you reclaim tax you’ve overpaid.
Get your CIS refund with Tax2u
At Tax2u, we specialise in helping CIS subcontractors and limited companies file accurately and claim their rebates fast. Whether you’re a new company or managing multiple contracts, we’ll take care of the admin so you can focus on building your business.
Claim your CIS tax refund with Tax2u today and make sure every penny you’ve earned comes back to you.