Accounting Insights

Common CIS Mistakes and How to Fix Them

By March 25, 2026No Comments

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Common CIS Mistakes and How to Fix Them

The Construction Industry Scheme (CIS) is an essential tax regime designed to regulate payments between contractors and subcontractors in the construction industry. CIS registration can be complex, and businesses can often make costly mistakes that causes administrative headaches with HMRC.

At BCS Accountants, this month’s blog looks at common CIS mistakes and how to fix them. For more information, contact us on 01524 824111.

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Failing to Register for CIS on Time

One of the most common mistakes made by both contractors and subcontractors is failing to register for the Construction Industry Scheme on time. Contractors are responsible for deducting money from payments made to subcontractors and passing these deductions to HMRC.

Subcontractors need to register so they receive payments under the scheme at the correct rate. Late registration can result in fines from HRMC, payment delays and strained business relationships.

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Deducting the Wrong Amount of Tax

The deduction rate depends on whether your subcontractor is registered, unregistered, or on gross payment status. If you don’t use the correct rate, you can end up overpaying or underpaying to HMRC.

Make sure you are aware of every subcontractor’s verification status before each job. If you have used the wrong date, you can update your records and submit a corrected return as soon as possible.

Missing CIS Return Deadlines

CIS returns are due by the 19th of each month. If you are late, HMRC charges penalties for each day you miss. If you miss the deadline, you must file a return as soon as possible. The sooner you submit your return, the smaller your fine will be.

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Not Keeping Records Properly

It is a requirement to keep CIS records for at least 3 years. This includes payment statements, invoices, deduction details and verification checks. It is recommended that you use digital accounting software.

With this, you can ensure your records are safe and backed up. Additionally, accounting software reminds you of upcoming deadlines.

Not Having an Accountant

Trying to handle CIS on your own can lead to missed deadlines, wrong deductions, or wrong paperwork. At BCS Accountants, we provide CIS accounting to support you and ensure everything is up to date.

Working alongside you, we can review your returns and check for any mistakes or missed claims. We can also help you plan ahead, avoid penalties, and ensure all records are up to date.

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Contact BCS Accountants For Comprehensive Accounting Services

If You Are Looking For Help With Your Accounting Or Need Tax Advice, We Can Help!

Contact Us Today!

Top Quality Advice And A Personal Service

Contact BCS Accountants

For accounting advice, contact our team at BCS Accountants. We are based near Carnforth, but cover Morecambe, Lancaster and Kendal. Call us on 01524 824111. Alternatively, send us a message via our contact form and we’ll be in touch.

About Us
Call: 01524 824111
Contact Us

Contact BCS Accountants For Comprehensive Accounting Services

If You Are Looking For Help With Your Accounting Or Need Tax Advice, We Can Help!

Contact Us Today!

Professional Accounting And Tax Advice

Contact BCS Accountants

Address:
BCS Accountants & Tax Consultants
Care of – TRW Accountants
95 King Street
Lancaster, LA1 1RH

Contact Details:
Tel: 01524 824111
Fax: 01524 825327

Email: enquiries@b-c-s.co.uk

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