Understanding your situation
You want the current child support calculation reviewed or varied, but you want to do it through the administrative process — not a contested court motion.
In the US, federal law requires every state child support enforcement agency to offer periodic review of support orders (typically every three years on request), and sooner if there's a substantial change in circumstances. This is an administrative process — no court appearance, no attorney, no filing fee in most states.
In the UK, CMS variations are separate applications (different forms for different variation types) that allow the standard calculation to be adjusted for specific circumstances:
- Contact costs over a weekly threshold
- Boarding school fees
- Debt repayment from the former relationship
- Investment income
- Notional income from assets over a threshold
- The paying parent's controlled-company earnings
Both processes require specific evidence and the correct form. A correctly drafted administrative request includes: identification of the case and the specific grounds, current financial documentation, and a cover letter citing the statutory basis. Agencies typically process complete applications in 60–120 days; incomplete applications get rejected and restart the clock.
What you need to prepare
- ✓Current child support order or CMS calculation
- ✓Most recent 2 years of federal tax returns / UK self-assessments
- ✓Last 3 months of pay stubs or income documentation
- ✓Evidence of the grounds for review
- ✓For UK variations: the applicable CMS variation form
- ✓Shared-care calendar if custody percentages are in dispute
- ✓Cover letter citing statutory grounds and specific relief requested
⏰ Deadline
US: typically an automatic right to review every 3 years; sooner on substantial change showing. UK: CMS variations can be applied for at any time when grounds exist; annual reviews happen automatically. For substantial-change reviews, file as soon as the change occurs — new calculations typically apply from filing date forward.
🏛️ Authority
US: State child support enforcement agency (IV-D agency). UK: Child Maintenance Service (part of DWP).
⚖️ Legal basis
US: federal law requires periodic review procedures; state IV-D statutes provide the specific administrative framework. UK: Child Support Maintenance Calculation Regulations 2012 (variation provisions). The DocuGov generator inserts current references in the generated request.
Expert tips
- 1Determine which path applies before filing — US administrative review (free, agency-handled), UK variation (specific form, CMS-handled), or court motion (required if the other parent will contest the recalculation). Administrative paths are faster; court motions are needed only when consent is unlikely.
- 2Use the correct form. Agencies reject non-standard submissions on sight — a generic letter asking for review rarely triggers the statutory process and will typically be returned without action.
- 3Attach complete financial documentation. Missing documents are the #1 reason for rejection and restart. At minimum, include two most recent tax returns or self-assessments, last 3 months of pay stubs or equivalent income records, and a cover letter listing exactly what is attached.
- 4For US 3-year reviews, you typically don't need to show substantial change — you have a statutory right to periodic review regardless of whether your income or circumstances have changed. Flag this explicitly in your cover letter if it applies.
- 5For substantial-change requests, document the percentage change clearly — compare income figure on the current order to your current income and show the math. Agencies reject vague 'my income is down' requests.
- 6For UK special-expenses variations, keep receipts for every qualifying expense — CMS is strict on documentation. Keep expense records monthly as the case is pending; late-supplied evidence is often disregarded.
- 7For UK additional-income or notional-income variations, be prepared to provide evidence about the paying parent's financial affairs — Companies House records, accounts, or other public filings. These are the hardest variations to win and usually require specific evidence rather than argument.
- 8Processing timelines vary — US administrative reviews commonly take 60–120 days, UK CMS variations often similar. During this period, the existing calculation remains in effect, so keep paying (or receiving) at the current rate.