What Happens When the CSA/CMS Gets It Wrong?

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What Happens When the CSA/CMS Gets It Wrong?

When Things Go Wrong with Child Maintenance

The Child Maintenance Service handles thousands of cases, and mistakes do happen. Payments might arrive late, calculations can contain errors, and communication sometimes falls short of what parents expect.

Both receiving and paying parents can find themselves dealing with problems. A receiving parent might wait longer than expected for payments to come through, while a paying parent may feel the assessment does not reflect their actual circumstances. Whatever the issue, there are several steps parents can consider to address problems.

Raising Your Concerns Directly

If something has gone wrong with your case, start by contacting the Child Maintenance Service directly. You can do this by phone or in writing. Many parents prefer to put complaints in writing because it creates a record you can refer back to later.

When you contact them, explain the problem clearly and include your case reference number. Be specific about what has gone wrong and what outcome you want. If you send a letter or email, keep a copy for your own records.

The person handling your initial contact will often try to resolve the matter straight away. Simple issues like updating contact details or correcting obvious errors may be sorted at this stage, though resolution times can vary depending on the specifics of your case.

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Escalating Through the Complaints Process

If the initial response does not resolve your problem, you can ask for your complaint to be looked at by a senior complaints handler. The Child Maintenance Service has a formal complaints procedure with different stages.

At each stage, someone more senior will review what has happened. You should receive a written response explaining what they found and what action, if any, they will take. Keep copies of all correspondence throughout this process.

The timeframes for responses can vary depending on how complex your case is. If you do not hear back within a reasonable period, follow up with a phone call or letter asking for an update.

Your situation may be slightly different. ask a question below ↓ and our editorial team will reply with our advice.

Taking Your Complaint Further

If you have completed the internal complaints process and remain dissatisfied, further options include contacting the Independent Case Examiner, who reviews complaints about several government bodies including the Child Maintenance Service.

The Independent Case Examiner will only consider your case once you have completed the internal complaints process. They look at whether the service has treated you fairly and followed correct procedures.

Your Member of Parliament can also make enquiries on your behalf, though their ability to influence outcomes will vary. You can find contact details for your local MP on the UK Parliament website.

In some situations, you may be able to challenge a maintenance calculation through a formal appeal to the Social Security and Child Support Tribunal. This is a separate process from making a complaint about service quality. Appeals must usually be made within one month of receiving a decision you disagree with, though extensions may be granted in certain circumstances.

Keeping Good Records

Throughout any dispute with the Child Maintenance Service, keeping organised records will help your case. This includes:

  • Copies of all letters and emails sent and received
  • Notes of phone calls, including dates, times and the names of staff you spoke with
  • Bank statements showing payment dates and amounts
  • Any documents supporting your position

Good records make it easier to demonstrate what has gone wrong and when. They also help if your complaint moves to an external body like the Independent Case Examiner.

For current information about the complaints process and your rights, visit the Child Maintenance Service section on GOV.UK, where you can find guidance on making complaints and details of the formal appeals process.

The Next Step

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Now that you have read through the advice above, you might want to put it into practice. Our Child Support Rights Checker lets you answer a few questions about your situation and get a clear summary of your child maintenance rights and options. Try it now →

Ask Child Support Laws a Question
ChildSupportLaws Editor 29/08/2026 at 10:00 am
@sioux That sounds really frustrating. Your son needs to request a Mandatory Reconsideration in writing, and if that's rejected he can appeal to the First-tier Tribunal, which tends to look at evidence far more fairly than CMS caseworkers do. Gather proof they cohabit: joint bills, council tax, bank statements, shared food shops, photos, and ideally statements from neighbours or the GP. Shared care evidence (school runs, nights he has the child) also reduces liability, so log everything with dates.
sioux 29/08/2026 at 8:53 am
My son has done all the mandatory reconsideration sent proof of school pick ups after school activities etc.the cms are simply taking his wife at her word although this is a complete lie.the stress this is causing is awfull he has no money left at the end of month to live on.so we are now having to support both our son and granson.while she spens the money on her horses.what else can we do?
sioux 29/08/2026 at 8:46 am
my son has applied for divorce his wife has gone to cms he now has to pay £540 month as well as mortgage and all other bills.the both live at same address they have a son.she claims she is primary carer.she is not both my son and us as granparents do most of the care.she has other commitments,she has two horses to look after,my son has tried everything he can to prove the still live at same address,the cms are not listening to him or us.he just get rejected.
ChildSupportLaws Editor 26/04/2026 at 8:51 am
@jonsey What you've described sounds utterly exhausting, and the mention of ending your life has really worried me. Please reach out to Samaritans on 116 123 right now, day or night as you don't have to face this alone.

The situation you're facing with the CMS, especially with your son living with you, sounds deeply unfair and there may well be grounds to challenge it properly. Citizens Advice can help you navigate a mandatory reconsideration and tribunal at no cost, and Gingerbread also runs a helpline specifically for parents dealing with child maintenance issues. A welfare rights adviser could look at the figures alongside HMRC's records to see where things have gone wrong.

Please make that call to Samaritans first. Your life matters far more than any of this paperwork.
jonsey 26/04/2026 at 8:23 am
I have had huge issues over many years with CSA- and HMRC , NOBODY talks to each other , at times paying 1750 a month , having challenged many times my boys are now 20 and 23 and yet today I had a letter saying I now have to pay 1100 a month for just one of them , earning 35k at 68 years old, nobody cares , nobody helps or can give you an answers why , been honest its broken me , my son even lives with me after not wanting to live with his mother who is a alcoholic yet what ever is said or contacted in cloud of alcohol, to CSA , they believe ,, my life is broken if I dont agree , do I stop work , right now at 68 I will try and fight yet again , I will try and get a tribunal but been honest I have lost so much and is it worth it , I cant fight this much longer I dont have any quality of life and it might not be worth been around much longer , I will go to prison I will not pay any more I would end my life and make sure my sons get everything , but I will not pay anymore ..
Mark 02/12/2025 at 3:04 pm
I have made payments and i mixed up the 1st month which i called the CMS to be told to not stop making payments to which i continued and now they have went to direct from my earnings but the payments i have made they have rejected. I don't understand how i can be making payments on their guidance to now have made 1400 and now they have rejected my payments. It is a corrupt system and they told me that benefits are an entitlement which is protected and earnings are not. I have now went to my local MP and i have been contacting media and next step is taking it as far as i can go. I have been paying on the 1st of the month and my debt has been going up. I have never refused to pay. I have a 12 year old son that i have raised on my own and when i got in touch with CMS all those years ago they did not help me then either and says there was not a claim to be made. They are either biased against dad's or working people. System is corrupt and unjust and im taking it all the way as this is not fair. Never ask the government for help because if you not living on benefits or in crisis then you are forgotten about
Jamesc 04/05/2025 at 8:39 pm
I contacted them when I lost my last job and they seemed to acknowledge this when I phoned them. However, they assessed me as still working without telling me. They sent my letters to say they had an order for arrears that this wrong assessment accrued although I was overseas. I returned to find lots of "Orders" and my bank telling me that my account was frozen. This was over two years since I had been working. They seemed to have done some kind of reassessment every October and said that HMRC had contacted them to say I was working. However, HMRC have no record of me earning anything. They now sent me a letter with my assessment and I asked them to do a "mandatory reconsideration". I don't know if that will change their assessment. I have also been to see my MP to request they make a complaint directly and then to contact the Ombudsman. Very crazy system and hard to find out what they have done or why! Will they force me to sell my house, take my passport? It is bizarre and like a fascist country now.
Joey 01/12/2024 at 8:43 pm
Hello all, me and my ex had a private arrangement. I didn’t update my account but I had a standing order paying £310 per month. When I update my account I had £2500 in arrears. My ex told CSA via the app that I had not paid. She told me it was a mistake. I’ve sent over evidence that I had paid over and every month I was only meant to be paying £230. They have told me that they will not be taking the S/O into account. I’ve asked CSA to look at it again. My ex is now going to receive £98 per month. CSA are taking £166 from my wages. My ex has told me she won’t phone them up. She’s stubborn. Surely having a years worth of S/O evidence is enough to show I’ve paid. I’ve applied for tribunal
helpneeded 15/10/2024 at 2:09 pm
Hello me and my partner are in need of serious help or advise regarding our child maintenance situation. they have completely messed up our calculation and the amount we owe just keeps increasing each month. despite the fact we have uploaded bank statements to prove we have made payments. we just don't know what else to do to get this resolved, we have written letters and calling so many times. But they just keep saying the same old rubbish to us that a re-calulation will be done, but when we log back in we just owe more and more money its insane. nobody there wants to deal with it. please any advise would be grateful. Kim and Nick
Peanut 25/01/2024 at 6:39 am
Csa/cms charges me for 14 months while I was in prison when I was realised they used a deo to collect money I didn’t owe during Covid I was on 80% and universal credit and was being left with £80 a month to live on I contested my mp he said sorry carnt help u I made a compliant got no respond and u carnt move forward to independent review until u have done the proper speak process I stopped furlough and universal credit to try and get it sorted I was put on a nil assessment April came along and they decided to go back to my 2021 tax code to charge me now I’m not working and they’re are building up a debt for me so when I do go back towork they can rip me off someone more I got them to finally take me to court went to court and straight away the csa/cms told the court ur not aloud to question how we asses people but ur assessment is where ur scamming start I feel like killing myself sometimes they bully u they abuse u they use excuses to just put the phone down on u it’s a joke
Maladministration 11/01/2024 at 7:33 pm
The CSA/CMS are not fit for service.
After taking 6.5k(LSDO) I got ICE involved and after 4 years got money back and compensation. They bullied and harassed me at every turn and the mistakes in their calculations etc etc cost the taxpayer over 40k to sort.
If anyone out there needs advice get in touch and I will do my best to point you in the right direction.
One thing you musky do is give up or give in .
Victim 10/01/2024 at 1:04 pm
I am a victim of the CSA from 2001 to 2019. The CSA continually made mistakes with my case in an attempt to criminalise me, and I was paying what they asked me to pay.

As with the Postmasters, there are many of us who have been treated disgracefully by them, and Politicians should order an inquiry into the practices of the CSA.

What happens between parents and their children should remain in the hands of legal advisors and the courts and not in the hands of incompetent grade 1 clerks.
DosetChef 06/10/2023 at 4:51 pm
I feel as though the system is biased and broken. I have shared contact with my two kids. 3 nights on week 1 and 4 on week 2. My ex has told CMS that I have them 2 nights per fortnight. The people I’ve spoken to at CMS have asked if I have a court order to prove when I have contact. Which I don’t. So they asked if i received the child benefit for the kids. Which I don’t, and I’m sure 99% of dads don’t. I’ve spoken to a solicitor who said if I try to get a court order regarding access that there would be a strong chance my ex would get more time with the kids. So they advised me that I should be happy having them when I do.

I’ve seen recently in the news that the government plan to “crack down on dead beat dads”. I feel there are a lot of dads who try to do the best they can for their kids, however the system seems to let them down. I feel as though something needs to change.
Mackemlad 14/09/2023 at 1:10 pm
Christmas 2020 I had to work 4 weeks mandatory overtime for Christmas I was doing 60 hours a week, cms used these 4 weeks to calculate my annual earnings but didn't notify me of the calculation till June the following year with an attachment of earnings letter, they calculated I was on 44k a year when really I was only on 24k, they were taking 627 pound a month out of my wages, it's took me nearly 3 years to get this sorted, but also I was going through a court battle to get shared care for my son, couldn't afford to eat never mind money for a solicitor ended up in debt and rent arrears, I'm still suffering due to this, I gt shared care December last year, they asked me to send the court order in as proof, I did so, then they rejected it. Ended up getting my local mp involved. They found 14 mistakes on my case, amd my ex partner has been massively over paid. They offered me 150 pound as an apology yet in still I thousands of pounds of debt because of them. I lost my job this year too and since I lost my job I've been on universal credit yet I've still acquired over 2000 pound arrears since I lost my job, they've been charging me more than I get each month! I have zero faith in this service
Ess 02/09/2023 at 12:41 am
CMS are not fit for purpose. I've been endlessly chasing them and getting nowhere. I escalated it to a formal complaint...no one called me back despite being promised a manager would call me. Next day I called again.... registered another complaint. I was assured a manager would call me today. It's now gone 11pm...CMS did not call. I have not put a formal complaint in with my Local MP. CMS have got my payment wrong and sat on the case for 31 days so far. They are inept, take zero responsibility and are not fit for purpose. Paying Dad's need to ride up against CMS and get things sorted.
Angry PP 13/08/2023 at 12:11 pm
In Jan 2016 I left my wife and our 3 children as I couldn’t put up with the arguments over the smallest of things. We also said that we would be amicable if we ever separated and that’s how it started. I had left once before in 2005 for 4 months and CSA was paid. I was making agreed payments of £75 a week for my 3 children (I wasn’t on great money) that was until I received a letter from CMS stating that I was obligated to pay child maintenance through their process from June 2016. While they worked my payments out, they advised me to continue paying what I was paying and they would take that into account. I received my first annual review end of July 2016 with the first payment due Aug 4th 2016. I made the agreed £70.72 payment which included £65 on-going maintenance and arrears. I contacted them and was advised to send them a bank statement which I did. The payments that I made was never taken into account. In November 2016, there was an adjustment of £4900 on the account meaning that there was a huge arrears. My payments shot up to over £200 a week. I contacted them and they stated it’s for a CSA arrears but couldn’t give no dates or details. After 3 years of arguing this, I finally got all of the records from the CSA case. The CSA hadn’t closed the case in June 2005, but did in April 2007. I finally got the arrears reduced to £612.15 in 2020. I had an overpayment on the case which was put as an adjustment on 27th Jan 2020 and was approved by a EO and HEO. The RP requested to close the case. In March 2020, the overpayment was reversed by a CW. In April 2021, the RP opened a new case. The CMS have refused to to move the overpayment and the difference of the original CSA arrears and the reduced amount over to the new case. In November 2021, the CMS system miraculously changed my status to in hospital, a default calculation was done and back dated leaving me with a £2500 arrears. This took 10 months to change back. In February 2023, the CMS changed the payment type from Direct Pay to Collect & Pay and then to DEO all on the same day. They sent the DEO to a former employer, they had confirmation that I didn’t work there. They then sent one to my current employer. They added £50 enforcement charges and backdated the collect and pay charges back to April 2021. In March 2023, every previous payment on the old case was removed. I had an account statement sent to me in April 2023, this is where I found the removal of payments. I have tried to raise a complaint on 5 occasions since October 2022 in regards to the overpayment, but never had a response. I have now sent in 2 more dissatisfaction letters on 20th July 2023, both have been received, yet I have had no response from them, even just to say that they have them. They have blocked me in every way and show how non- impartial and incompetent they are. I fee like I am banging my head against a brick wall with these people. I have counted 203 payment removals on the account, 7 other maladministrations,
Domestic abuse victi 24/05/2023 at 12:11 pm
Hello,

It not just child maintenance that is messed up. Cafcass and the family courts are incompetent. I left my abuser and have been made to suffer his continue abuse for a further 7 years by the courts. Apparently full time mothers and abuse are irrelevant to a childs welfare so they gave him sole custody. After taking 5 years of full time work to pay of the financial abuse and start saving for a home. I was exhausted, no life at all, threats from my ex and a system that tells me off for even breathing. I paid my abuser child maintenance all that time. Even though his parents are paying for everything she wants and he pockets the money for himself. He managed to cause me to loss my job, I admit the complex post traumatic stress disorder caused by all this hell and his years of abuse didn't help much. I lost my job, child maintenance stopped. I decided to go back to university and since I started there they keep saying I need to pay over £340 per month to my abuser. I've not got an income at all, I'm a full time student. I have no home, I have no income, my brain doesn't function right anymore. There is no point to being alive. My course finishes in September, I was starting to think about what I would do then, but there is no point. He bullied his way to having the house and all the finances, I didn't get a single penny. Going back to uni was kind of my attempt to get a break from hell, it hasn't worked. The abuse doesn't end and child maintenance help reward highly abusive people who are wrongly in charge of our lives. The cafcass officer refused to look at evidence and court paperwork before writing her report. They don't care about children. My daughter screamed and clung to me when he got sole custody, because he had all the money and house. She screamed and was traumatised and they just say it is a normal reaction. The whole system is evil. I've told child maintenance to put me in jail for life. I tried my best and the authorities told me off - it is selfish for a woman to leave an abusive man. I should of stayed with my abuser and died. It would have been fair kinda than this horrid sentence they gave me. I wish he had killed me the day he assaulted me with his car. I want to go to prison or be executed for my crime of leaving an abusive man.
CMSARECUNTS 15/04/2023 at 5:28 pm
Child Maintenance have reduced my savings account to zero (11k) despite miscalculating what I owe. No prior warning given. Have had no calls either from them since I called in July 2022.

Assessment started September 2016.

I stopped working in October 2017 due to a bad injury. I informed them of nil income as per their A5 booklet.

According to them I owed nothing 2 1/2 years ago.
Then 2 years ago (April 2021) I went back to work and a month later 8 letters in the door on one day. Out of the blue they want £26000.00. No explanation, no how, no where from? Apparently I was earning £800.00 per week while off injured. Have asked for their evidence. Nothing sent.
No answers depite promises of looking into it from a case worker and her supervisor. Never heard from those 2 women again.
I was even threatened by another woman.
My son is now 21. Assessment ended 3 years ago. They also didn't confirm he was still in school.
His mother refused to adhere to multiple court orders over multiple years so haven't seen him for around 6 years.
Child maintenance doesn't care about fathers not seeing their children. They are only interested in earning money from collecting and distributing.

Last phone call to them was July 2022 and lost count how many times before to sort.
Put so much info on their useless portal it became full. Nothing was actioned.
No call backs actioned from their portal despite multiple complaints and requests.
Asked for a calculation breakdown over 2 years ago. Nothing yet.
Now when you call you get Triage snowflakes instead of useless case workers.

But apparently I have a tone when I spoke to them.
My 19/03/2023 at 6:01 pm
Had a great job, was used for a baby without my permission. Lost my job due to stress and despair. Can’t and don’t want to see the child as was against my wishes. Used abused lost everything. Some women are liars cheats and thieves out to trap via love bombing and lying about contraception. The CMS are used by these liars cheats to line their pockets ruin lives and drive people to suicide. I’ve been close on the streets penniless unable to provide a roof over my head let alone someone else. CMS response to trapping a man which should be a crime by saying tough your the dad like it or not with the customary don’t care about the cost of you living or your mortgage. Aaaaaw now your unemployed you owe back pay, hang fire I told you the day I became unemployed I’d no income and sent my p45 plus letter from x employer as proof. Guess what according to CMS still working so we will take your savings as you now owe back pay for them months you’ve not worked. I’m still not working! Two years later them savings I scrimped and saved for fifteen years disappeared. Broken by the CMS with nothing in my pockets after seven hard years at uni all for nothing, I said mum I’m going out for a walk that was 18 months ago been in the woods since. Cheers CMS. And if people wonder how I can type this message guess what I’m on my friends phone who came looking for me I may get a meal tonight!
Bunny 15/03/2023 at 7:21 am
This system is terrible, I urge you to challenge CMS decisions and behaviour, if it feels unfair it probably is. Once challenged any money paid goes into a holding account until the court decision. Court sounds scary, I sent my notes, did not attend court unfortunately as letter arrived late (typical) but the judge found in my favour, all o/s debt wiped. You can challenge, you can win and you can get your money back.
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