The Child Maintenance Service (CMS) was not designed with high earners in mind. Its formula works well enough at modest income levels, but for those earning above a certain threshold, it hits a ceiling and stops. What happens above that ceiling is where things can get complicated, contested, and costly.
For high earners going through divorce, child maintenance is rarely a simple calculation. It sits alongside business valuations, dividends, pension sharing, and tax questions that most standard guidance simply does not cover. Getting it wrong, or leaving it to chance, can have significant financial consequences for years to come.
What is the CMS Income Cap (and Why Does it Matter for High Earners)?
The CMS calculates child maintenance based on the paying parent’s gross weekly income. As of 2024, the CMS cap sits at £3,000 gross per week (approximately £156,000 per year). Once income exceeds this figure, the CMS formula stops scaling automatically.
For many of the clients we work with at Lowry Legal, this cap is quickly reached. Sometimes even before investments, bonuses, or dividends are factored in.
When the paying parent earns above the cap, the receiving parent can apply for a “top-up” order through the courts. This allows a judge to go further than the CMS would on its own. The court has wide discretion here, which can have a significant financial impact on both parties.
How the CMS Calculates Child Maintenance for High Earners
Before reaching the cap, the CMS uses a percentage-based formula applied to gross income:
- 12% of gross weekly income for one child.
- 16% for two children.
- 19% for three or more children.
These rates reduce if the paying parent shares overnight care with the children. At the CMS cap of £3,000 per week, a parent with one child would pay £360 per week (around £18,720 per year) as a baseline. For high earners, any additional maintenance above this must be agreed privately or ordered by a court.
To put that in context, a parent earning £400,000 per year pays exactly the same CMS figure as one earning £156,000: £18,720. The formula simply does not stretch further. A court, however, can adapt. In a top-up application, a judge may consider whether a child’s standard of living should more closely reflect the paying parent’s actual wealth, and order significantly more as a result. The difference between the CMS baseline and a court award can run to tens of thousands of pounds more per year.
Do CMS Payments Include Bonuses?
One of the most common questions we hear from high-earning clients is regarding whether CMS payments include bonuses or not. The short answer is yes, bonuses can be included. But the process is not automatic.
The CMS bases its initial calculation on gross annual income as reported to HMRC. If a bonus has already been included in a tax return, it will likely be factored in. However, if bonuses vary significantly from year to year, as they often do for those working in finance, law, or senior corporate roles, the CMS figure may not reflect actual earnings at the time of assessment.
Where bonuses push total income above the CMS cap, the receiving parent may apply for a top-up order. Courts routinely consider bonuses as part of the wider financial picture, particularly where they form a consistent and significant part of a person’s remuneration package.
Consider this scenario: a director earns a base salary of £180,000 plus an annual bonus of £120,000, making total income of £300,000. The CMS calculation is based on the capped figure, producing a maintenance figure of £18,720 for one child. But when the receiving parent pursues a top-up order, the court will look at the full £300,000, the consistency of that bonus figure over previous years, and the child’s accustomed lifestyle. The resulting order could be higher value, and it could also include provision for school fees and other costs on top.
The bottom line? If your remuneration includes a mix of salary, bonus, and share options, it is important to obtain specialist legal advice before any figures are set in stone.
Does the CMS Take Into Account Mortgage Payments?
Another question that comes up regularly: does the CMS take into account mortgage payments? The answer is no, at least not directly. The CMS does not reduce a paying parent’s liability based on mortgage commitments. Whether you are paying a substantial mortgage on a family home or a buy-to-let portfolio, this is not deducted from your income for CMS purposes.
However, mortgage payments can become relevant in broader financial negotiations. In high-value divorces, it is common for the overall settlement (including property, pensions, and maintenance) to be dealt with as a package. An experienced family lawyer can advise on how housing costs fit into this wider picture, particularly where one party remains in the family home with the children.
Can Child Maintenance Be Backdated?
If you’ve separated but haven’t formalised maintenance arrangements yet, you might be wondering whether you’ve already lost out. The short answer: maintenance can be backdated, but how far depends on the route you take. This is an area where many clients, on both sides of a divorce, are often caught off guard.
When a CMS application is made, maintenance is typically due from the date the application is received by the CMS, not from the date of separation. This means that if there has been a delay in making a formal application, arrears may already be accruing.
For top-up orders made through the courts, a judge has discretion over whether and how far to backdate payments. If a paying parent has been aware of their obligation but has failed to make voluntary payments, the court may take a dim view of this.
If you are the receiving parent and payments have not been made since separation, acting promptly, and with proper legal support, can make a significant difference to what you recover.
Agreeing Child Maintenance Privately: The Benefits for High Earners
Many high-earning couples choose to bypass the CMS entirely and reach a family-based arrangement (FBA). This is a private agreement between parents and can be more flexible, quicker to implement, and less adversarial than CMS involvement.
A well-drafted private agreement can cover:
- School fees and extras (trips, uniforms, tutoring, etc.).
- Extracurricular activities.
- Holidays and travel costs.
- Medical and dental expenses.
- University costs.
These features sit outside the standard CMS formula entirely. If an agreement can be reached, ideally with legal input to ensure it is fair and clearly documented, it often produces better outcomes for both parents and children.
A private agreement can later be made into a consent order approved by the court. This gives it legal weight and makes it enforceable. Without this, a verbal or informal agreement offers limited protection if circumstances change.
Tax Relief on Maintenance Payments
Tax relief on maintenance payments is an area that surprises many clients, as it is extremely limited under current UK law. In general, child maintenance payments, whether made through the CMS or by private agreement, are not tax deductible for the paying parent. Equally, they are not taxable income for the receiving parent.
Spousal maintenance (as distinct from child maintenance) operates under slightly different rules, though these too were significantly restricted following tax law changes in the 1980s and 1990s. Maintenance payment tax relief, as it once existed, no longer applies to the vast majority of arrangements made today.
Where income structures are complex, involving dividends, share schemes, or offshore arrangements, the tax implications of any settlement should be reviewed carefully by both a family lawyer and an accountant with expertise in high net worth divorce.
Business Interests, Shares, and Pensions: The Broader Picture
For high earners, child maintenance rarely exists in isolation. It sits alongside questions about business valuations, share schemes, pension sharing, and investment portfolios. Each of these can influence, and be influenced by, the overall maintenance picture.
For example:
Business income: If a paying parent is a shareholder-director, income may be structured as a combination of salary and dividends. The CMS looks at gross income as assessed by HMRC, so dividends declared may be included. Courts, in top-up applications, can look further still; including at retained profits within a company.
Let’s say a shareholder-director is paying themselves a salary of £80,000 and dividends of £120,000, making a total declared income of £200,000. The CMS may assess on the full £200,000 where dividends are clearly evidenced in tax returns. But where a forensic accountant identifies that £500,000 of profit has been retained within the business and not drawn down, a court may take a broader view of what is available. Particularly if this pattern began around the time of separation.
Share options and LTIPs: Long-term incentive plans and share options are increasingly common in senior roles. These may vest (become available to the holder) during or after divorce proceedings and can be considered by the court when assessing a party’s overall resources.
Pensions: While pensions are not directly factored into CMS calculations, they form a critical part of the overall divorce settlement. How a pension is dealt with (sharing order, earmarking, or offsetting) will affect both parties’ long-term financial positions and should be considered alongside maintenance arrangements.
Getting the full picture right requires a team approach. At Lowry Legal, we work alongside financial advisers, forensic accountants, and tax specialists to ensure that no stone is left unturned.
HNW CMS Calculations: Quick Answers to Your FAQs
How does child maintenance work for high earners above the CMS cap?
When a paying parent earns more than £3,000 gross per week (around £156,000 per year), the CMS formula reaches its ceiling. The receiving parent can apply to the court for a “top-up” order. A judge will then assess what additional maintenance is appropriate, taking into account the overall financial resources of both parents and the needs of the children.
Q: Do CMS payments include bonuses?
Yes, bonuses can be included in a CMS calculation if they have been reported to HMRC and form part of gross income. Where bonuses are irregular or take total income above the CMS cap, the receiving parent may need to pursue a court order to have them properly accounted for. Specialist advice is recommended where remuneration packages are complex.
Does the CMS take into account mortgage payments?
No, the CMS does not reduce a paying parent’s liability to reflect mortgage commitments. However, mortgage costs can feature in wider negotiations as part of an overall financial settlement, particularly where the family home is involved and one parent continues to live there with the children.
Can child maintenance be backdated?
Child maintenance through the CMS is generally backdated to the date the application was made, not the date of separation. For court-ordered top-up payments, the judge has discretion over backdating. Delaying an application can result in a shorter recovery period, so taking prompt legal advice is important.
Is there tax relief on maintenance payments in the UK?
In most cases, no. Child maintenance payments are neither tax deductible for the paying parent nor taxable income for the receiving parent under current UK law. Spousal maintenance is similarly restricted. Anyone with a complex income structure should take specialist tax and legal advice alongside their divorce proceedings.
Why Specialist Legal Advice Matters
Child maintenance for high earners is not a one-size-fits-all calculation. The stakes are higher, the variables are more complex, and the outcomes for both paying and receiving parents can be significant over time.
Whether you are a high earner concerned that an application could result in an oversized award, or a spouse seeking to ensure a fair outcome for yourself and your children, having a specialist on your side matters.
At Lowry Legal, we advise clients across England and Wales on all aspects of high net worth family law. Our guidance covers everything from child maintenance for high earners, to Schedule 1 applications, and negotiating private arrangements that protect your children’s future without sacrificing financial fairness. We take a straightforward, no-nonsense approach, so you understand your position clearly and find it easier to make informed decisions.
Ready to find out where you stand?
Contact Lowry Legal today to arrange a confidential consultation with one of our specialist family lawyers. There is no obligation, and early advice almost always leads to better outcomes.
This article provides general information about child maintenance for higher earners in England and Wales. It should not be relied upon as legal advice. For guidance specific to your circumstances, consult a qualified family law solicitor.
