CIS Returns & CIS Tax Refunds UK

Construction Industry Scheme Specialists

The Construction Industry Scheme (CIS) is complex, deadline-driven, and heavily monitored by HMRC.

Whether you need to submit CIS returns as a contractor or file a CIS tax return as a subcontractor, Protax Consultants manages the entire process accurately and on time.

We keep contractors compliant and help subcontractors recover the maximum legitimate tax refund.

Contractor or Subcontractor? We Handle Both.

CIS rules differ depending on your role.

I Am a Contractor

You must file a CIS monthly return and correctly deduct tax.

I Am a Subcontractor

You likely overpaid tax and need a CIS Self Assessment tax return to claim your refund.

For Contractors – CIS Monthly Returns & Compliance

If you are a contractor, you must:

Verify subcontractors with HMRC
Deduct 20% or 30% tax correctly
Submit CIS returns online every month
Provide payment and deduction statements

The CIS return deadline is the 19th of each month (covering payments made up to the 5th).

Miss it by one day, and HMRC issues an automatic £100 penalty.

We handle:

Subcontractor verification
Deduction calculations
Filing your CIS monthly return
Generating required statements
Software integration (Xero, QuickBooks, Sage)

You stay compliant. We manage the admin.

What Is a CIS Return?

A CIS return is a mandatory monthly report submitted to HMRC by contractors. It confirms:

Payments made to subcontractors
Tax is deducted under the scheme
Verification status

Failure to submit a CIS return results in automatic penalties.

For Subcontractors – CIS Tax Return & Refunds

If you are a subcontractor, contractors usually deduct 20% from your payments.

However, your real tax liability is often much lower once expenses and allowances are applied.

This means you may be owed a refund.

We prepare your CIS Self Assessment tax return and:

Calculate your total CIS deductions
Offset your Personal Allowance
Claim allowable expenses
Submit your tax return to HMRC
Secure your CIS tax refund directly to your bank

Common allowable expenses include:

Tools and equipment
Van mileage
Materials
Protective clothing
Public liability insurance

Many subcontractors overpay taxes every year. A professional review often results in a significant rebate.

CIS Return Deadline – Avoid Automatic Penalties

Your CIS return deadline date is strict:

File by the 19th of each month
Covers the tax month ending on the 5th

Penalty structure:

£100 immediately for 1 day late
Escalating fines for continued delay

If you are behind on CIS returns, act immediately. We can file outstanding returns and stabilise your position with HMRC.

What Is a CIS Nil Return?

A common mistake.

If you paid no subcontractors in a month, you must still file a CIS Nil Return.

Failure to submit a nil return results in a £100 penalty.

We monitor your activity and file nil CIS returns online on your behalf, keeping your record clean.

Frequently Asked Questions – CIS Returns

How do I submit a CIS return online?

Contractors must use HMRC-approved software to file monthly CIS returns. We manage this submission for you.

How do I claim my CIS tax refund?

Subcontractors claim their refund by filing a Self Assessment tax return after 5 April, offsetting CIS deductions against their true tax liability.

Can I amend a CIS return?

Yes. Errors can be corrected online. We can amend historic CIS returns to prevent HMRC compliance issues.

What happens if I miss the CIS return deadline?

HMRC issues an automatic £100 fine. Penalties increase the longer the return remains outstanding.

Do I need to file a CIS nil return?

Yes. Even if no payments were made, contractors must submit a nil return to avoid penalties.

Get Your CIS Support Today

Whether you need to:

File a CIS monthly return
Submit a CIS nil return
Claim a CIS tax refund
Fix late filings

We make CIS compliance simple and stress-free.

What Our Clients Say

    
 
 
       Posted on Google  
   
   Mohammad Yasir 
 
 
 
 Trustindex verifies that the original source of the review is Google. Very professional & excellent service.
  
 
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   Androulla Papathanasiou 
 
 
 
 Trustindex verifies that the original source of the review is Google. Protax Consultants Ltd are absolutely an excellent Accountancy firm, with a great support service.The entire team espicially Muhammad have been professional and very helpful, we as a company had a great experience, very easy to comunicate our company needs, no complaints all done with ease, Highly recommended, will not go esle where now.

Thank you from
Ready Metal Co.Ltd
  
 
      Posted on Google  
   
   Edgar Costa 
 
 
 
 Trustindex verifies that the original source of the review is Google. Used Protax for my first year in Business. The process was so so simple and smooth i checked a few accountants before going with Muhammad and Protax. As a new business owner accountants can be a little confusing. Definitely was for me and not only did the team do a-lot for me. They also taught me a-lot. Will be using Protax for as long as i am in business. Highly recommend.
  
 
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   F Ali khan 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent services and amazing customers satisfaction focus.  I highly recommend Protax.
  
 
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   Mick & Maria Cass 
 
 
 
 Trustindex verifies that the original source of the review is Google. We have used Protax Consultants from day one of starting up our business, Always friendly and available to help with any problems we come across. No need to worry about Payroll, VAT, taxes or any other financial part of the business with Protax Consultants on our side.
Cass Transport Services Ltd

Behind on CIS Returns?

Received a penalty notice or HMRC letter?

Do not ignore it.

We can bring your CIS account up to date quickly and professionally.