The figure used by the Child Maintenance Service is not the amount that arrives in your bank account. It is usually based on gross weekly income : before income tax and National Insurance : even though your rent, food, travel, parking, utilities and the cost of caring for your children are paid from net income.
That difference matters.
For fathers dealing with child support matters, family court proceedings or difficult household budgets, understanding the contrast between gross income and disposable income is vital. This guide explains the current CMS rules, the limited deductions available, and why many fathers believe the system needs a fairer approach to ability to pay.
General information only: This article is not legal advice. CMS decisions depend on individual facts, evidence and the law in force at the time. Check the official guidance or obtain advice about your circumstances.
Gross income is not take-home pay
Your gross income is your earnings before deductions such as:
- Income tax
- National Insurance
- Rent or mortgage payments
- Council tax
- Food and household bills
- Travel to work
- Parking
- Debt repayments
- Clothing and school-related costs
- Travel and accommodation for contact with your children
Your net income is what remains after tax, National Insurance and other payroll deductions. That is the money available to keep a roof over your head, travel to work and maintain a meaningful relationship with your children.
The CMS generally starts with the paying parent’s gross weekly income, rather than asking a full household-budget question: What can this father realistically afford after meeting ordinary living costs?
That is the central concern behind the gross-versus-net debate.
CMS usually relies on HMRC historic income
The CMS normally obtains a yearly income figure from HM Revenue and Customs. It then:
- Identifies the paying parent’s gross income.
- Allows for relevant pension contributions and certain other adjustments.
- Converts the annual figure into a weekly amount.
- Applies the statutory maintenance rate.
- Takes account of other children in the paying parent’s household.
- Applies any qualifying shared-care reduction.
This means a recent fall in income may not immediately appear in the CMS calculation if the figure is based on older HMRC data. If your current income is materially different, evidence may be important when asking CMS to review or update the assessment.
Read the official GOV.UK guide to how child maintenance is worked out, including the related step-by-step publication.
The current CMS rates: nil, flat, reduced, basic and basic plus
Under the current statutory framework, the CMS applies one of several rates based on gross weekly income.
| Gross weekly income | CMS rate | General position |
|---|---|---|
| Below £7 | Nil rate | No maintenance under the calculation |
| £7 to £100, or certain benefits | Flat rate | £7 per week |
| £100.01 to £199.99 | Reduced rate | A formula based on income |
| £200 to £800 | Basic rate | 12% for one child, 16% for two, 19% for three or more |
| More than £800 to £3,000 | Basic plus rate | Basic rate on the first £800, then 9%, 12% or 15% on the excess |
The percentages are applied according to the number of qualifying children:
- One child: 12% of the relevant income up to £800; 9% on the relevant slice between £800 and £3,000.
- Two children: 16% up to £800; 12% on the excess.
- Three or more children: 19% up to £800; 15% on the excess.
Only the first £3,000 per week is counted by the CMS calculation. Where income is higher, the receiving parent may be able to apply to the court for additional maintenance.
If income is unknown or information is not provided, CMS may use a default rate, currently stated by GOV.UK as:
- £38 per week for one child
- £51 per week for two children
- £64 per week for three or more children
These calculations are not a direct percentage of take-home pay. They are statutory figures built primarily around gross income.
A simple example of the real-life pressure
Suppose a father has gross weekly income of £600 and one qualifying child.
At the basic rate, 12% produces a starting figure of £72 per week, before considering other children, pension contributions, shared care or an accepted variation.
But the father does not receive £600 in his bank account.
His actual net pay may be reduced by tax, National Insurance and pension contributions. From what remains, he may have to pay:
- Rent or mortgage
- Council tax and utilities
- Fuel or public transport
- Parking at work
- Food
- Clothing
- Insurance
- Contact-related travel
- Food, activities and bedroom costs when his child stays overnight
The CMS calculation does not ordinarily deduct every ordinary living cost. That is why a payment that appears affordable when viewed against gross income can leave a father with very little practical disposable income.
Benefits are assessed differently
It is important to make a factual distinction when comparing child maintenance with benefits.
Personal Independence Payment (PIP) is not means-tested. It is generally assessed by looking at how a long-term physical or mental health condition affects daily living and mobility. A person may receive PIP while working or having savings, subject to the eligibility rules.
Income Support is means-tested and is designed to support people with limited income in particular circumstances. Most new claims have been replaced by Universal Credit, but the comparison remains useful: means-tested support looks at financial circumstances and eligibility thresholds, rather than simply applying a percentage to gross earnings.
These systems are not identical. However, they demonstrate the wider policy question: should financial obligations take account of assessed living needs and the person’s ability to maintain a stable home?
A child is a child. The child’s needs matter in both households.
Why the policy debate must include both homes
The current CMS formula recognises some factors, including pension contributions, other children and overnight care. But it does not operate as a complete assessment of the cost of parenting across two homes.
A fairer policy model could consider:
- Average age-related costs for children
- The number of children involved
- The actual care-time pattern
- The costs of maintaining suitable accommodation in both homes
- Travel and contact expenses
- The paying parent’s essential housing and work costs
- Both parents’ financial resources
- The father’s realistic ability to pay without becoming unable to live safely and responsibly
This is the principle behind parity parenting UK advocacy: children benefit when both parents can remain stable, present and properly equipped to care for them.
Maintenance should support children. It should not unintentionally make it impossible for a parent to house them, feed them or travel to see them.
Shared care reductions recognise overnight contact
Shared care is based on the number of nights a child stays overnight with the paying parent.
For the reduced and basic rates, the statutory reductions are:
- 52 to 103 nights: reduction of 1/7
- 104 to 155 nights: reduction of 2/7
- 156 to 174 nights: reduction of 3/7
- 175 nights or more: reduction of one-half, plus an extra £7 per child per week
For example, a £72 weekly calculation with 104 to 155 overnight stays could be reduced by 2/7, producing approximately £51.43 before any other relevant adjustments.
Shared care is not simply a question of whether a father has parental responsibility. Evidence of actual overnight care, an agreement or a court order may be important.
For a non-benefit paying parent on the flat rate, overnight stays do not normally reduce the payment. Different rules can apply where the flat rate is because the parent receives benefits.
Contact costs can support a variation application
A paying parent may apply for a variation so that qualifying contact costs are taken into account as a reduction to the income used in the calculation.
Examples may include necessary:
- Fuel or public transport costs
- Travel between the two homes
- Car hire where appropriate
- Accommodation where a same-day return is not reasonably practicable
- Certain minor travel-related costs
The contact costs generally need to be at least £10 per week on average. A paying parent cannot apply for this type of variation if they receive benefits or have gross income below £7 per week.
Keep evidence such as:
- Receipts
- Travel bookings
- Mileage records
- Accommodation invoices
- A contact calendar
- The agreed or ordered arrangements
Apply through the CMS and contact them on 0800 171 2345. The official resource is Variations explained: a guide for paying parents.
Director loans and business structures are not safe loopholes
Some fathers ask whether income can be reduced through a director’s loan, company structure, dividends or retained profits.
The clear answer is this: do not conceal or divert income.
Director loans, artificial business arrangements and diverted income are not guaranteed ways to avoid CMS liability. The CMS can consider additional income, assets and possible diversion of income. It may also use information from sources such as Companies House.
The law includes powers relating to variation applications and enforcement. Non-compliance can lead to arrears and enforcement action, including deductions from earnings or accounts and other serious consequences.
Be transparent. Keep proper accounts. Obtain regulated tax and legal advice where business income is involved. A lawful variation application is very different from attempting to hide money.
What fathers should do now
If your CMS calculation does not reflect your current reality:
- Check whether the income figure is historic or current.
- Review pension contributions and other children taken into account.
- Record every overnight stay accurately.
- Calculate qualifying contact costs.
- Gather receipts and supporting documents.
- Ask CMS about a variation if the rules allow it.
- Seek advice before restructuring income or making business decisions.
- Keep child maintenance separate from arguments about contact or alleged breaches of a child arrangements order.
A father we support described the emotional impact in simple terms: “I wanted to support my child, but I also needed enough left to remain a reliable parent.” That is not an unreasonable position. It is the foundation of responsible parenting.
Stand with fathers seeking a fairer system
Fathers deserve clear information, equal respect and practical child custody advice. If you are navigating CMS calculations alongside family proceedings, explore the resources at Fathers Rights UK, including our guide to representing yourself in a UK family court and our guide to UK family court hearings.
Join us in championing a system that supports children in both homes. Share your experiences safely and without posting private information about children or protected parties.
Fathers United. Rights Respected.
Every Dad Matters.
Official sources
- GOV.UK: How child maintenance is worked out
- GOV.UK: How we work out child maintenance ; step-by-step guide
- GOV.UK: Variations explained : a guide for paying parents
- The Child Support Maintenance Calculation Regulations 2012
- The Child Support Act 1991
- GOV.UK: Personal Independence Payment eligibility
- Fathers Rights