16/01/2026
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.