UK Child Maintenance Service — Section 16 Revision Request (30-Day Letter)
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Your Role & Case
Tell us whether you are the paying parent or the receiving parent, the CMS case reference, and the date of the decision you want revised.
This letter will cite
Child Support Act 1991, Section 16 (revision within 30 days) and Section 20 (appeal to First-tier Tribunal by SSCS1); Child Support Maintenance Calculation Regulations 2012 (12% / 16% / 19% gross-income rates with the reduced-rate band above £800 per week); R (Kehoe) v Secretary of State for Work and Pensions [2005] UKHL 48
Your letter will request a Section 16 revision within the 30-day deadline, set out each disputed figure with the correct number, and preserve your right of appeal to the First-tier Tribunal (Social Entitlement Chamber) under Section 20 if CMS refuses.
Both parents have the right to request a Section 16 revision. Each side disputes different figures — paying parents usually challenge income; receiving parents usually challenge shared-care or pension deductions.
The 12-digit case reference printed at the top of every CMS letter and shown in your CMS account at gov.uk.
The 30-day window runs from the date PRINTED on the decision notice. Late requests up to 13 months can sometimes be accepted on special-circumstances grounds.