Elixir - Chartered Tax Advisers & Accountants

Are your CIS deductions being calculated and submitted on time each month?

CIS returns are due every month — even if no payments are made. Late or incorrect submissions can trigger automatic penalties, interest, and HMRC queries.

If you’ve ever had:

Late filing penalties
HMRC letters asking for explanations
Disputes over CIS deductions

…it’s often a sign something isn’t being handled correctly.

Getting CIS calculations right and submitting on time isn’t just admin — it’s how you avoid penalties and stay off HMRC’s radar.

Subcontractors: CIS shouldn’t mean giving HMRC an interest-free loan.

If you’re paid under CIS, 20% is taken off your invoices before you even see the money. For many subcontractors, that’s more tax than they actually owe — and HMRC holds it until your return is filed.

That’s cash your business could be using right now.

👉 Gross Payment Status can change this.
With gross status, you’re paid in full, with no CIS deductions taken off each month. You keep control of your cash flow and settle the correct tax later — instead of HMRC holding your money all year.

It’s not automatic, and it’s not for everyone.
You need to meet HMRC’s rules and stay compliant to qualify and keep it.

But if you do, the difference to your cash flow can be huge.

If you’re tired of CIS deductions draining your monthly income, it may be time to see whether gross status is right for your business.

Do you have proper contracts in place with your subcontractors — and do they reflect reality?

Having a contract isn’t enough if it doesn’t match how the work actually operates.

If HMRC reviews your CIS arrangements, they will look at:

Who controls the work

How and when the subcontractor is paid

Whether they can send a substitute

Who bears the financial risk

If the paperwork says one thing but the working relationship shows another, HMRC may decide the worker is really an employee — not a subcontractor.

That can lead to:

Backdated PAYE and National Insurance

Penalties and interest

Costly disputes with HMRC

Regularly reviewing subcontractor contracts helps ensure they reflect the true working relationship and reduces the risk of HMRC challenges

Most CIS workers overpay tax — without realising it.

If you’re paid under CIS, the tax taken off your payments is not your final tax bill. It’s just a payment on account to HMRC.

When your tax return is done properly, you can:
✔ Claim allowable business expenses
✔ Use your personal allowance
✔ Set off CIS already deducted

For many subcontractors, this means they’ve paid more tax than they actually owe during the year — and HMRC owes them a refund.

The problem is, if these claims aren’t made correctly, the overpayment is simply left with HMRC.

If you’re working under CIS, it’s worth checking whether you’re overpaying tax — and whether you’re due money back.

Would an HMRC enquiry worry you?

For most businesses, it should — especially under CIS.

An enquiry can mean:

Detailed checks of your CIS records

Questions on deductions, verification, and filings

Time-consuming back-and-forth with HMRC

Risk of penalties, interest, and assessments

The good news?
Most HMRC enquiries start because of errors, late returns, or inconsistencies.

If your CIS records are accurate, up to date, and compliant, an enquiry becomes far less stressful — and often avoidable.

Strong compliance is your best defence against HMRC.

Are you registering and verifying all subcontractors before making payments?

If you pay a subcontractor without registering and verifying them with HMRC first, CIS rules require you to deduct 30% tax — not 20%.

That extra tax comes straight out of the payment and can cause:

Higher costs

Cash flow issues

Disputes with subcontractors

HMRC compliance problems

Registration and verification must be done before the first payment is made. Miss this step, and the consequences can be costly.

Get CIS registration and verification right from day one — it protects your business and avoids unnecessary tax deductions

Are your records complete, accurate, and up to date?

Do you know whether your bookkeeping would stand up to an HMRC review?

Are you keeping digital records in line with Making Tax Digital (MTD)?

Do you always know how much tax you owe and when it’s due?

CIS deductions aren’t your final tax bill. Are you paying too much?

If you’re a CIS subcontractor, the tax taken off your payments is not the final amount you owe. It’s only a payment on account to HMRC.

When your tax return is done properly, you can:
✔ Claim allowable business expenses
✔ Use your personal allowance
✔ Set off CIS already deducted

For many subcontractors, this means they’ve overpaid tax during the year — and HMRC owes them money back.

The key is getting the numbers right and filing correctly.
Otherwise, HMRC simply keeps what you’ve overpaid.

If you’re paying CIS every month, it’s worth checking whether you’re paying too much — and whether you’re due a refund.

If you’re paid under CIS, 20% is taken off your invoices before the money reaches your bank. For many subcontractors, that’s more than they actually owe — and it can seriously strain cash flow.

👉 Gross Payment Status can help.
With gross status, you’re paid in full, with no CIS deductions taken off each payment. That means more money available for wages, materials, and running your business — instead of sitting with HMRC.

Gross status isn’t automatic. You need to qualify, apply correctly, and stay compliant to keep it.

But if you do, the impact on your cash flow can be significant.

If CIS deductions are holding your business back, it may be time to see whether gross status is right for you.