CIS and PAYE are both “busy” systems. They sit in the middle of paying people, running sites, and keeping projects moving. When you are stretched, it is easy for small admin slips to turn into penalties, lost status, or a growing HMRC balance.
Most problems start the same way. A deadline is missed. A return goes in late. A payment is “just this once” pushed back. Then it becomes a pattern. At Anderson Brookes, we help directors and business owners take control again with clear, practical steps, without judgement.
Why CIS and PAYE Trip Businesses Up
CIS and PAYE are different, but the pressure points are similar:
- Lots of moving parts: subcontractor details, labour splits, timesheets, payroll data
- Frequent reporting: monthly CIS returns, every payday for PAYE reporting
- Cash flow pinch: money deducted is not really “spare”, but it can feel like it when the bank balance is tight
The good news is that you do not need perfection. You need a simple process that is repeatable, with clear checks before each deadline.
CIS Pitfalls that Cause the Biggest Problems
Not Verifying Subcontractors Properly
If you do not verify a subcontractor, you can end up using the wrong deduction rate. That can create arguments, rework, and a messy return later.
A simple habit helps: verify before the first payment, then keep the verification result on file.
Getting Labour and Materials Wrong
CIS deductions apply to the labour element, not materials in many cases. Mistakes here tend to come from rushed invoices and unclear paperwork.
If invoices vary in format, create a standard rule for what you will accept, and push back on anything unclear before payment.
Missing the Monthly Return Deadline
This is one of the most common triggers for penalties. HMRC’s CIS guidance says you must submit monthly returns by the 19th of each month following the last tax month, and it sets out the escalating penalties for late filing. Make sure to send your monthly returns to HMRC by the 19th.
A practical fix is to treat the 19th as your “hard stop” and work backwards:
- 10th: subcontractor invoices finalised
- 12th: check labour/material split
- 14th: verify any new subcontractors
- 16th: draft return and reconcile totals
- 18th: final sign-off and submit
Forgetting Nil Returns
If you had no subcontractor payments in a month, you may not need to file a return, but you do need to tell HMRC no return is due for those months, otherwise penalties can still arise.
Saying “Not Employees” Without Checking Status
Monthly CIS returns require you to declare that listed subcontractors are not employees. HMRC warns that giving the wrong employment status can lead to penalties.
If you have labour-only subcontractors who work like employees, this is worth checking properly. It is far easier to fix status early than to fight it later.
Sectors We Support
We support company directors in every sector, from construction firms and logistics companies to pubs, cafés, restaurants, hotels, retailers and manufacturers. Our advice is always clear, confidential and shaped by real experience in your industry. Whether you’re dealing with unpaid tax, supplier pressure or falling income, our team understands the challenges and will guide you through the best next steps.
CIS Gross Payment Status Mistakes
CIS gross payment status can make a big difference to cash flow. Losing it can hurt quickly, because deductions start coming off payments.
What tends to cause problems is not one big event. It is a pattern HMRC sees as non-compliance, often linked to late CIS returns, VAT or PAYE submissions, or payments to HMRC, or records that do not match what is reported.
Even if you are trading well, admin gaps can chip away at compliance until HMRC takes action.
A simple way to protect yourself is to treat compliance like a routine, not a scramble:
- one person accountable
- a checklist for each month
- a clear “close” after filing so nothing is left hanging
PAYE Pitfalls that Catch Businesses Out
RTI Reporting Not Sent on Time
Under RTI, employers send a Full Payment Submission (FPS) each time they pay employees. GOV.UK’s running payroll guidance covers the regular reporting steps and how FPS and EPS fit into the month.
Where things slip is when payroll is processed late, or when payments are made “off-cycle” and the reporting does not follow.
If you pay staff early for Christmas, pay an advance, or run a bonus, you need a process so reporting keeps pace with reality.
EPS Missed or Misunderstood
EPS is often used for claims and adjustments (for example statutory payments), and missing it can make your liability look higher than it should, at least until it is corrected.
If your payroll software handles this, make sure someone understands what it is doing. If it does not, make sure it is on your monthly checklist.
Late Filing Penalties and “Specified Charges”
Late or missing RTI submissions can trigger penalties. GOV.UK explains what happens if you do not report payroll information on time, including late filing penalties and how HMRC may estimate what you owe.
This is one reason PAYE problems can feel like they grow without warning. If HMRC estimates, you can end up arguing about the number rather than fixing the underlying issue.
Paying PAYE Late or In Part
When cash flow is tight, PAYE can feel like something you can “borrow” from. But PAYE is one of the areas where HMRC tends to apply pressure quickly, especially if it becomes a pattern.
Late payment penalties can apply to PAYE and National Insurance amounts not paid in full and on time, and that interest continues to build on unpaid amounts. This is where PAYE arrears can build quietly and then become difficult to shift, especially if you are trying to keep up with current payroll at the same time.
Quick Pre-Deadline Checklist
Each week
- Log any new subcontractors and verify before first payment
- Keep CIS deductions and statements up to date
- Check payroll changes (new starters, leavers, overtime patterns)
Each month
- Reconcile CIS payments, materials, and deductions before submitting
- Confirm nil return position if no subcontractor payments were made
- Run payroll and confirm reporting matches pay dates
- Set aside PAYE/NIC and CIS deductions so they are not swallowed by day-to-day costs
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What to Do If You’re Already Behind
Step 1: Collect Information
List what is overdue and what is due next. Separate it by:
- CIS returns outstanding
- PAYE reporting issues (missing FPS/EPS, late filings)
- PAYE/NIC amounts overdue
- Any VAT arrears alongside it
This is where “managing everything” becomes far less stressful once you can see it clearly. A practical way to approach it is to focus on managing HMRC debts in a structured order, rather than reacting to each new letter.
Step 2: Fix Reporting
In many cases, you need to get returns up to date before you can have a sensible conversation about what you owe. Start by bringing CIS returns up to date and fixing RTI submissions to stop HMRC from using estimates.
Once reporting is accurate, you can deal with the real number rather than a moving target.
Step 3: Avoid Promises You Cannot Keep
If you agree to payments that fail quickly, pressure usually increases. A smaller plan you can maintain is often better than a bigger plan that collapses.
If you are unable to pay tax on time, it is better to deal with that head-on than to keep drifting.
Step 4: Get Advice
If arrears are increasing month by month, it is a sign the business may need a bigger change, not just better admin.
At Anderson Brookes, we can help you map the options, understand the risks, and decide what is realistic from here.
Construction-Specific Pressure Points
Construction has its own challenges. Payment delays, retention, disputed valuations, and cost spikes can knock cash flow off course quickly. That is why CIS and PAYE issues often show up in construction first.
When One Failure Spreads Through the Chain
If a key customer or main contractor delays payment, subcontractors and payroll still need to be paid. Cash flow tightens, and HMRC becomes one of the creditors left waiting.
This is one reason contractor insolvency is not only a problem for the business that fails. It can create a ripple effect across everyone connected to the project.
When CIS and PAYE Sit Alongside Wider Distress
If CIS and PAYE problems are part of a wider pattern, such as supplier pressure, mounting arrears, or no working capital, then it can be a sign the business is moving into a higher-risk zone.
At that point, many construction firms in insolvency need a clear plan quickly, because waiting often removes options rather than creating them.
Time to Consider a Bigger Step?
Sometimes, after reviewing the numbers, it becomes clear the company cannot realistically catch up while staying compliant going forward.
If that is the case, you may need to look at bringing matters to a proper close. There are compliant routes to close a company with HMRC debts and reduce ongoing risk and pressure.
That is not a decision to rush. But it is also not a decision to postpone indefinitely if the position is deteriorating.
FAQs
What is the single biggest CIS mistake?
Missing the monthly return deadline. It can trigger penalties quickly, and it often happens when admin is squeezed around site work.
Does a nil month still matter for CIS?
Yes. If no subcontractors were paid, you may not need to file a return, but you should tell HMRC no return is due, otherwise penalties can still arise.
What is the most common PAYE reporting pitfall?
Late or missing RTI submissions, especially where payroll is irregular or there are off-cycle payments.
Can HMRC estimate what I owe if reporting is late?
Yes. If reports are missing or late, HMRC may estimate, and that can make the problem feel bigger until it is corrected.
What happens if PAYE is paid late?
Late payment penalties can apply, and interest can build on unpaid amounts.
What should I do first if I am behind on both CIS and PAYE?
Get reporting accurate first, then deal with payment. It is much easier to agree a realistic plan when the numbers are clear.
Avoid CIS and PAYE Pitfalls with Expert Advice
CIS and PAYE problems usually start small, but they rarely stay small if the underlying cash flow issue is not addressed. A simple monthly routine can prevent most pitfalls. If you are already behind, it is still possible to bring things back under control with a clear plan.
If you want a calm view of your options and a practical next step, Anderson Brookes can help you reduce the pressure and decide what is realistic from here. Visit our contact page to book a free consultation, or ring us on 0800 1804 935.
