CMS Complaints Letter Generator

A complaint fixes how you were treated, not what you were told to pay

The complaints process exists for service failure. Calls that go unanswered, documents that vanish, a caseworker who promised to ring back in March, information that turned out to be wrong, a case sitting untouched for four months while arrears build. All of that is legitimately a complaint.

What it cannot do is change a maintenance calculation. No complaint handler at any level has the legal power to alter a figure, and no amount of evidence will persuade them otherwise. Disputing the income used, the shared care nights, the number of children or the effective date is a job for a mandatory reconsideration, and that has a hard deadline of one calendar month from the date printed on the decision letter.

Parents lose that month constantly. The figure looks wrong, the complaint goes in, a holding letter arrives, then a substantive reply six weeks later apologising for the delay in replying. The complaint may even be upheld. The calculation stays exactly where it was, because it was never in the complaint handler's gift.

The four stages, and what each one can order

Escalating out of order gets your letter sent back. Each stage wants proof that you have finished the one before it.

One structural point explains a lot about why this ladder looks the way it does. The CMS is a directorate inside the Department for Work and Pensions, not an executive agency, so there is no chief executive and no separate board to write to. In law every CMS decision is a decision of the Secretary of State for Work and Pensions. If you have ever wondered why nobody at the CMS seems to be personally accountable, that is why, and the question of who actually runs the CMS is worth reading before you decide who to address a letter to.

Do not fire the same letter at all four at once. The ICE will close a case that has not finished the CMS stage, and the Ombudsman will not look at anything the ICE has not seen. Copying your MP in from the start is different, and it is sensible. An MP can chase at any stage without displacing the formal process, and a caseworker who knows a constituency letter exists tends to be more careful with the file. Time limits matter too. The ICE expects complaints reasonably promptly after the CMS response, so do not let an unsatisfactory reply sit in a drawer for a year, particularly where arrears and time limits are part of what you are arguing about.

Your MP is the step that moves cases

An MP does not write to the CMS. They write to the DWP minister who holds the child maintenance brief, and ministerial correspondence is logged, tracked and answered to a deadline. A case that has sat still for months frequently starts moving within weeks of that letter landing.

Keep the MP letter short. One page. Case reference at the top, three or four dated facts, one sentence on the effect it has had on your household, and a specific ask. "Please ask the minister why my case has had no caseworker action since 14 January despite four calls" is actionable. Two thousand words about the whole history of your separation is not.

Include the case reference and the National Insurance number you gave the CMS. Without them the DWP cannot look you up, and you will lose a fortnight to a letter asking for details you could have supplied at the start. If you want the wider picture on how long things are meant to take before you claim delay, the general CMS processing timescales are a reasonable benchmark: roughly 4 to 12 weeks for an initial calculation, and 6 to 8 weeks to set up a Deduction from Earnings Order.

What service failure looks like in practice

Vague dissatisfaction gets a template response. Specific failures get investigated. These are the ones that stick.

• Evidence sent and not acted on. You posted payslips in February, the calculation issued in April on the old figure, and nothing on the file records the payslips arriving
• A reported change of circumstances that was never processed, leaving you paying on income you no longer earn
• Repeated calls with no callback, or four different caseworkers giving four different answers to the same question
• Enforcement action taken while a reconsideration was still open, or a Deduction from Earnings Order set up without the notice you were entitled to
• Arrears figures that change between letters with no explanation of what moved or why. Work out what you think the balance should be with the arrears calculator and put your figure in the complaint
• Being told something that was simply untrue, for example that a liability order would be applied for when no application had been made

How to write one that gets actioned

Complaint handlers work through queues. Yours needs to be the one that is quick to deal with, because quick to deal with means quick to uphold.

1. Case reference in the first line, with your name, address and date of birth. Every letter, every stage
2. A dated chronology, not a narrative. "12 March: payslips posted, recorded delivery XX123. 4 April: calculation issued on 2022/23 income. 9 April: called, told the payslips were not on file"
3. One paragraph on the effect. Money you could not budget for, an overdraft, a payment you missed. Keep it factual
4. A specific ask. Not "I want this sorted out". Something like "recalculate from 12 March using the payslips supplied, confirm the corrected arrears balance in writing, and tell me why the evidence was not recorded"
5. A deadline and a named next step. State that you will refer the matter to the Independent Case Examiner if there is no substantive response within 15 working days

What redress actually covers

Expect an apology, a correction of the record, action on whatever was left undone, and sometimes a consolatory payment. Direct costs such as phone calls, postage or a wasted day of annual leave can be reimbursed if you itemise them and keep receipts.

What you will not get is damages for distress in the way a court might award them, and you will not get maintenance the other parent never paid. A complaint about failure to enforce can make the CMS enforce. It does not turn the department into a guarantor of the debt, and that distinction disappoints a lot of receiving parents who reach the end of the ICE process expecting a cheque.

None of that makes the process pointless. A complaint that is upheld creates a written record of what went wrong, and that record is useful if the same failure happens again, if you later need to explain a gap to a tribunal, or if your MP is asking the department to account for the handling of your case. It is also the only route that produces any accountability at all for how you were treated, as opposed to what you were assessed to pay.

Common questions