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CIS nil return checker.
From 6 April 2026, HMRC reinstated mandatory monthly CIS returns — including nil returns. Even if you didn’t pay any subbies this month, you need to file something. Tell us what happened and we’ll tell you what to do.
This tax month
6 June 2026 → 5 July 2026
Filing deadline: 19 July 2026 (the 19th of the month after the period ends).
Stop missing CIS deadlines
Get nudged before every deadline.
Honest Invoices reminds you 5 days before the 19th of every month if you haven’t filed yet. We track your filings, your inactivity windows, and the subbies you’ve verified — all the paper trail you need if HMRC ever asks. £15/month, locked.
Sources & methodology
Tax months under CIS run from the 6th of one calendar month to the 5th of the next. The filing deadline is the 19th of the month after the period ends. From 6 April 2026, HMRC reinstated mandatory monthly CIS returns — including nil returns — and the full late-filing penalty regime that existed before 2015.
Inactivity requests last up to six months and must be submitted before the period they cover begins. Retrospective inactivity requests aren’t accepted.
Generated as of 2026-06-19. This tool is informational and doesn’t replace HMRC guidance — refer to CIS 340 on gov.uk for the authoritative version.