Navigating child maintenance can be highly complex, especially for high net worth families. However, it’s crucial to understand exactly what counts as income to ensure your children receive a fair level of support in the future.
This guide breaks down the main considerations under current English and Welsh law, highlighting some common misconceptions around child maintenance loopholes, and explaining how the latest reforms could affect both paying and receiving parents.
Understanding the Basics: What the CMS Considers Income
The Child Maintenance Service (CMS) calculates child maintenance primarily based on a paying parent’s gross weekly or annual income. This includes employment, self-employment, occupational and personal pensions, and certain taxable benefits. Some benefits and unearned income may require a variation request to be included. For wealthier families with multiple income streams, overseas properties, and business structures, this seemingly simple approach doesn’t always capture the full financial picture.
Under the new child maintenance law 2025, enforcement powers have strengthened significantly. The DWP can now use liability orders without lengthy court proceedings, and parents who refuse to pay face faster action, including property sales, passport revocation, and driving licence suspension. While these enforcement powers exist, they are reserved for last-resorts, and only tend to be applied when the paying parent can pay but refuses to do so.
Child Maintenance Company Director: Limited Company Case Study
One of the most common child maintenance loopholes historically involved company directors paying themselves minimal salaries whilst extracting significant income through dividends. This is where child maintenance and limited company arrangements become complicated.
Example: Robert owns a successful IT consultancy. He pays himself £8,700 annually through PAYE but draws £60,000 in dividends. The CMS initially calculates maintenance based only on his declared salary; resulting in minimal payments despite his substantial income.
How the System Addresses This
Since 2018, receiving parents can request a variation for “unearned income,” which includes dividends. Company directors must complete self-assessment tax returns, and HMRC shares this information with the CMS when variations are requested.
The Financial Investigations Unit (FIU) can investigate suspected under-declaration or deliberate diversion of income, examining company accounts, bank statements, and other evidence.
However, challenges remain. Some paying parents divert income to other shareholders (often new partners or family members), retain profits within their companies, or structure their finances to minimise declared income. The new enforcement measures aim to close these child maintenance loopholes more effectively.
Child Maintenance and Inheritance: Capital vs. Income
We’re often asked if inheritance counts as income for child maintenance. The answer is, not directly, but there’s an important distinction.
Inheritance itself doesn’t form part of gross income calculations. Under current CMS guidance, if a parent’s capital (excluding primary residence) exceeds £31,250, a notional 8% annual income may be applied to the excess for variation purposes.
Example: Sarah’s ex-partner inherits £150,000 from his father’s estate, which doesn’t automatically increase child maintenance. However, Sarah can apply for a variation based on his assets. The CMS may attribute a notional income of 8% annually (£12,000 on the amount exceeding £31,250) to the inheritance, which could significantly increase maintenance payments.
Other assets that count include:
- Cash savings.
- Property (excluding the primary residence).
- Land.
- Gold.
- Certain investments.
Any interest or dividends generated from inherited assets are also considered income.
Important: The receiving parent must actively request this variation. It won’t happen automatically. Time is critical, as spending or gifting the inheritance can complicate matters further. The CMS may even investigate whether those assets were deliberately dissipated to avoid maintenance obligations.
Can Child Maintenance Be Backdated in the UK?
This is a question which often causes confusion, and the answer depends entirely on when you first took formal action.
Child maintenance payments cannot be backdated to before the CMS application date, although arrears after the application are recoverable. Once you apply, maintenance becomes payable from that point forward. Any arrears accumulated after the claim started can be pursued, but the service won’t recover payments for periods before you submitted your application.
Critical Timing Point: If you separated in January but didn’t contact the CMS until July, you cannot claim for the six month gap. This makes early action essential.
How Far Can Child Maintenance Be Backdated?
There’s no fixed limit on how far child maintenance can be backdated once a claim exists. If a paying parent misses payments after a CMS arrangement begins, those arrears remain recoverable indefinitely.
Under the 2025 reforms, the CMS now pursues arrears more aggressively, aiming to recover outstanding amounts within two years and expecting paying parents to contribute up to 40% of net income toward clearing debts.
If changes in circumstances weren’t reported promptly, payments may be backdated to when the change occurred. For example, if a paying parent’s income increased significantly in March but they didn’t report it until September, the revised calculation could apply from March, creating substantial arrears.
For parents with previous CSA (Child Support Agency) cases, historic arrears can still be enforced, though the government has written off some older, unrecoverable debts where collection just isn’t cost-effective.
Beyond the Standard Calculation: Complex Earnings and Variations
High net worth families often have financial arrangements that don’t fit within standard calculations. The child maintenance loopholes that once allowed wealthier parents to minimise payments are closing, but understanding the variation system remains crucial.
When Can You Request a Variation?
Either parent can request a variation if the standard calculation doesn’t reflect true financial circumstances. Common grounds include:
- Assets Exceeding £31,250: As touched upon earlier, the CMS applies an 8% notional income to capital assets. This targets parents who are “capital rich, income poor” meaning they’re living comfortably from their assets whilst declaring minimal taxable income.
- Unearned Income: Rental income, dividends, and investment returns aren’t automatically included in calculations. Receiving parents must specifically request their inclusion.
- Diversion of Income: If a paying parent deliberately routes income elsewhere (paying excessive salaries to new partners, retaining profits in companies, or making excessive pension contributions solely to reduce maintenance), the CMS can investigate.
- Special Expenses: Paying parents can request reductions for legitimate costs like boarding school fees, travel to see children, or expenses for disabled children.
The Offshore Element
For families with international assets, all overseas income and assets must be converted to sterling and included in calculations. When requesting a variation based on foreign income or assets, failure to properly disclose and convert these holdings can result in reassessment or enforcement action.
Practical Steps to Protect Your Position
For receiving parents:
- Act quickly when circumstances change.
- Gather evidence before requesting a variation (Companies House filings, lifestyle proof, bank statements). When doing this, never attempt to access someone else’s private information, as it could result in you breaching privacy laws.
- Request variations promptly (28 days for backdating to reassessment date).
For paying parents:
- Report changes accurately and promptly.
- Comply fully with self-assessment obligations.
- Keep detailed records of all payments.
Note: The CMS can fine people up to £1,000 for failure to report changes. Imprisonment and other severe penalties are also available, although these are reserved for people who deliberately avoid paying their fair share.
The Current Landscape: Stronger Enforcement With Fewer Child Maintenance Loopholes
The new child maintenance law 2025 represents the most significant reform in over a decade. The emphasis has shifted decisively toward enforcement, with measures designed to eliminate any child maintenance loopholes that previously allowed parents to avoid fair contributions.
For families with significant wealth, these changes mean greater scrutiny of complex financial arrangements. The days of simply paying minimal salaries through limited companies or keeping wealth in non-income-generating assets are effectively over. However, receiving parents will need to understand the system and pursue appropriate variations.
The reforms also prioritise protection for victims of domestic abuse, ensuring that economic control cannot continue post-separation through child maintenance manipulation.
FAQs About Child Maintenance
What reduces child maintenance payments?
Several factors can legitimately reduce child maintenance payments:
Shared Care Arrangements: If children stay overnight with the paying parent for over 51 nights per year, reductions apply on a sliding scale (around 14% for 52–103 nights, 50% for 175+ nights).
Pension Contributions: Certain qualifying pension payments reduce gross income before CMS calculations.
Special Expenses: These include travel costs for child contact exceeding £10 per week, boarding school fees, mortgage payments on the former family home, or expenses supporting disabled children.
Important: All reductions must be requested through a formal CMS variation; they are not applied automatically.
How do I legally stop paying child maintenance?
Child maintenance obligations end when your child turns 16 (or 20 if they remain in approved full-time, non-advanced education: A-levels, vocational qualifications, etc. University doesn’t count).
You must notify the CMS when your child leaves said education. Payments stop on the last day of February, May, August, or November following notification. Always obtain written confirmation from the CMS that your obligation has ended to avoid ongoing liability or arrears.
Can CSA take 40% of my wages?
Yes. When collecting arrears via a Deduction from Earnings Order, the CMS can take up to 40% of your net income. This cap applies only to arrears collection, not to standard ongoing child maintenance payments. If this causes genuine hardship, you should contact the CMS immediately to discuss flexible arrangements under their Debt Fairness Charter.
Can you challenge child maintenance?
Yes, you can request a mandatory reconsideration within 30 days of the CMS decision letter. If still dissatisfied, you can appeal to the Social Security and Child Support Tribunal within one month. Common grounds for challenge include: incorrect calculations, wrong income figures, or requesting variations for unearned income, capital assets exceeding £31,250, or income diversion.
Does the CMS take outgoings into account?
No, the CMS does not consider general living expenses such as rent, utilities, debts, or day-to-day costs.
The only outgoings considered are special expenses exceeding £10 weekly: travel for child contact, boarding school fees, mortgage payments on the former home where the child lives, and expenses supporting disabled children.
Can you offset child maintenance?
No. You cannot offset child maintenance against voluntary payments or support you provide (school trips, clothing, activities, etc.). However, you can request special expenses through a variation (contact costs, boarding school fees, mortgage payments on the former home, disability-related expenses) to reduce the gross income used for calculations. Private agreements can include non-monetary support, but these cannot be enforced through the CMS.
Put Your Family First With Lowry Legal
Understanding how child maintenance calculations work — and what genuinely counts as income — empowers both parents to ensure fair outcomes for their children. Whether you’re navigating child maintenance and inheritance questions, complex company director arrangements, or wondering if child maintenance can be backdated in the UK, professional legal guidance can protect your position.
The closing of historical child maintenance loopholes highlights that all parents should contribute fairly according to their actual means. For families with substantial assets, multiple properties, overseas holdings, or business interests, specialist advice becomes essential to navigate these increasingly complex rules.
The fundamental principle remains unchanged: both parents have a responsibility to support their children financially. The recent reforms simply ensure this responsibility cannot be easily avoided.
Do you have questions or concerns about child maintenance, or believe your changed financial circumstances may affect payments?
If so, contact Lowry Legal today. Our specialist team can provide tailored guidance to help protect your interests and ensure fair support for your children.
This article provides general information about child maintenance laws in England and Wales as of January 2026. It should not replace specific legal advice tailored to your circumstances. Child maintenance rules are complex, particularly for families with multiple income sources.
