CMS can issue a DEO directly to your employer without any court order. But 60% of your net earnings are protected by law — and the calculation behind the DEO must be correct. If CMS has got the figure wrong, or ignored your household circumstances, you have grounds to challenge it.
Unlike bailiffs, driving licence removal, or prison committal, CMS does not need a Liability Order from any court to issue a DEO. They send it straight to your employer under s.32 Child Support Act 1991. Your challenge is not the order itself — it is the calculation behind it. Start there.
A DEO is a written instruction sent by the Child Maintenance Service directly to your employer. It tells them to deduct a set amount from your wages each pay period and send it to CMS. Your employer is legally bound to comply — failing to do so is a criminal offence under s.32(8) Child Support Act 1991. The DEO remains in force until CMS cancels it, your employment ends, or a court orders otherwise.
Regular monthly or weekly maintenance payments as calculated under your CMS assessment. This is the most common use of a DEO.
CMS can include arrears in a DEO. If you dispute the arrears figure — including where payments you made were not recorded — the underlying calculation is what you challenge.
No Justice of the Peace. No magistrates hearing. No Liability Order. CMS sends the instruction directly. The absence of court oversight is exactly why challenging the calculation through the complaints process matters.
A DEO takes from wages. Regular Deduction Orders (RDOs) take ongoing payments from your bank account. Lump Sum Deduction Orders (LSDOs) seize arrears directly from your bank. None of the three require a court order.
This is your most important protection. Under Schedule 3 to the Attachment of Earnings Act 1971, at least 60% of your net earnings cannot be deducted under a child maintenance DEO. CMS can only take from the top 40%.
You cannot go directly to court to block a DEO. But the maintenance calculation behind it must be lawful and accurate. Any of these grounds is enough to trigger a formal dispute.
Section 2 of the Child Support Act 1991 requires CMS to consider the welfare of any child likely to be affected when exercising a discretionary function — including children living with you. CMS has confirmed in writing in multiple documented cases that it does not apply s.2 to children in the paying parent's household.
Section 28E CSA 1991 allows you to apply for a departure direction — a formal reduction to the standard calculation — where the standard figure produces an unjust result. Common grounds include the cost of supporting children living in your household (a "special expense") and significant contact travel costs.
The National Audit Office's own officer confirmed on the parliamentary record in November 2022: "The Child Maintenance Service has been collecting the Child Support Agency's fictitious debt." The Comptroller and Auditor General issued an adverse opinion on CMS accounts (HC 252). Wrong arrears figures are a systemic problem — not an isolated error.
Where both parents each care for one child from the same relationship — each living in a separate household — Regulation 50 of the Child Support Maintenance Calculation Regulations 2012 requires a cross-calculation. Each parent's liability to the other is netted off, and only the difference is paid. In many split-care cases this produces a nil or nominal figure.
Work through these in order. Each step creates a paper trail. Silence or refusal from CMS at any stage becomes evidence in your escalation.
Set out your dispute: the calculation is incorrect, s.2 has not been applied to children in your household, and the arrears figure is disputed. Request a full written breakdown and ask for enforcement to be suspended while your dispute is investigated. Keep your proof of postage.
Put your employer on notice that the calculation is disputed and ask them to confirm the deduction does not exceed 40% of your net earnings. They cannot stop the deduction based on your dispute — but they must apply the 60% protected earnings threshold correctly.
If you have children in your household or significant contact travel costs, make a formal s.28E application in writing to CMS — this is separate from your general complaint. CMS must process it and issue a written decision. If refused, that decision can be challenged and placed before the ICE.
A SAR gives you every calculation CMS has ever run on your case, every arrears entry and its source, every case note, and every enforcement action taken. It often reveals exactly where an error was made — and internal notes CMS has never shown you.
Once CMS has not resolved your complaint within 40 working days, or you have their final response and remain unhappy, escalate to the ICE. They are independent of CMS, can find maladministration, require corrective action, and award compensation for distress caused by CMS errors.
If your effective deduction rate exceeds 100% of disposable income, or the formula has not accounted for your household children, grounds for judicial review exist under Article 14 ECHR (discrimination between income types) and Wednesbury irrationality — the formula has not been independently reviewed since 1989.
A DEO is one of six enforcement powers CMS holds. Three operate without any court order. Three require a Liability Order. HMCTS has confirmed in writing across multiple courts that no signed court order exists on any court file in any CMS case — this is now before the High Court (AC-2025-LON-001412).
| Power | Law | Court order? | What it means for you |
|---|---|---|---|
| Deduction from Earnings Order (DEO) | s.32 CSA 1991 | No LO needed | Sent direct to employer. 60% of net earnings protected. Challenge the calculation — not the order itself. |
| Regular Deduction Order (RDO) | ss.32A–32D CSA 1991 | No LO needed | Ongoing deductions direct from your bank. The bank receives only a CMS written instruction — no court document is ever shown. |
| Lump Sum Deduction Order (LSDO) | ss.32E–32K CSA 1991 | No LO needed | Arrears seized from bank. Just 14 days to make representations — to CMS, not a court. Can target joint accounts and business accounts. |
| Bailiff / Enforcement Agent | s.36 CSA 1991 | Valid LO required | Requires a court-sealed Liability Order. HMCTS confirmed no signed LO has been found on any court file in any documented CMS case. Demand the original before allowing entry. |
| Driving Licence Removal | s.39A CSA 1991 | Valid LO required | Requires a valid LO as its foundation. If the LO is void, the licence removal has no lawful basis. Challenge immediately in writing. |
| Committal to Prison | s.40 CSA 1991 | Valid LO required | Get urgent legal advice today. Parents have been imprisoned on unsigned orders with no valid LO on any court file — false imprisonment under Article 5 ECHR. Refer your solicitor to AC-2025-LON-001412. |
Send to your employer's HR or payroll manager by recorded delivery. Keep your proof of postage. Fill in the sections marked in yellow.
Send privately and confidentially. Recorded delivery only.
[YOUR FULL NAME]
[YOUR ADDRESS]
[DATE]
[HR / Payroll Manager name]
[EMPLOYER NAME AND ADDRESS]
PRIVATE AND CONFIDENTIAL — BY RECORDED DELIVERY
I write regarding a Deduction from Earnings Order (DEO) issued by the Child Maintenance Service in respect of my wages. I do not dispute your legal obligation to comply with a valid DEO under s.32(8) of the Child Support Act 1991. However, I am formally disputing the underlying calculation and write to ensure my statutory protected earnings are correctly applied.
Under Schedule 3 to the Attachment of Earnings Act 1971 as applied to child maintenance DEOs, at least 60% of my net earnings are protected and cannot be deducted. Net earnings means my wages after deduction of income tax, National Insurance contributions, pension contributions, and student loan repayments. Please confirm in writing that the current deduction does not exceed 40% of my net earnings calculated on this basis.
I am formally disputing the maintenance calculation on the following grounds:
I am pursuing a formal challenge to the underlying calculation directly with CMS. Please retain all CMS documentation relating to this DEO, confirm the current deduction amount in writing, and notify me immediately if any further instruction or variation is received from CMS.
Yours sincerely,
[YOUR SIGNATURE]
[YOUR FULL NAME PRINTED]
Committal to prison requires a valid Liability Order. HMCTS confirmed in writing across multiple courts that no signed court order exists on any court file in any documented CMS case. Show your solicitor the High Court proceedings AC-2025-LON-001412 and R v Manchester Stipendiary Magistrate ex parte Hill [1983] 1 AC 328. The Public Law Project (publiclawproject.org.uk) can refer you to a specialist urgently.
A Subject Access Request reveals every calculation, every case note, and every internal error CMS has never told you about. It is free, takes 10 minutes, and what you find may change everything.
If you are struggling with the pressure of CMS enforcement: Samaritans 116 123 (free, 24/7) · Mind 0300 123 3393