Private Pensions and Child Maintenance: How Pension Contributions Can Reduce CMS Calculations

If you pay child maintenance, it can be difficult to balance today’s responsibilities with planning for retirement. Even so, pension saving remains important. For many people, the State Pension alone will not be enough, and building up a workplace or private pension can make a real difference later in life.

The good news is that pension contributions can affect the way the Child Maintenance Service (CMS) calculates child maintenance. In many cases, qualifying pension contributions reduce the income figure used in the calculation, which can lower the amount payable.

This article explains how private pensions and workplace pensions are treated by CMS, what evidence you may need to provide, and when CMS may argue that contributions are excessive.

How pension contributions affect child maintenance

CMS usually works out child maintenance using the paying parent’s gross income from HMRC.

However, pension contributions can reduce the income figure used in that calculation.

A simple example:

If you earn £20,000 per year, CMS may initially assess maintenance using that full amount.

If you make £2,000 per year in qualifying pension contributions, the assessable income may reduce to £18,000, which can lower the child maintenance calculation.

This is an important point for parents who want to save for retirement without paying more child maintenance than the rules require.

Regulation 40 and pension deductions

The legal basis for this is found in Regulation 40 of the Child Support Maintenance Calculation Regulations 2012, which deals with pension contributions that are eligible for tax relief at source.

In practical terms, this means that where qualifying private pension contributions have not already been reflected in the HMRC income figure used by CMS, a deduction can be made when the correct evidence is provided.

Workplace pension or private pension: which is easier for CMS purposes?

From a child maintenance point of view, a workplace pension is often easier to manage.

That is because workplace pension deductions are sometimes already reflected in the taxable pay figure reported to HMRC. Where that has already happened, CMS may automatically use the lower income figure without needing any extra adjustment.

However, not all workplace pensions are handled the same way. In some cases, pension contributions are deducted after tax and National Insurance. Where that happens, CMS may still need to make a separate adjustment.

With a private pension, CMS will often see the full income figure first and only make the pension deduction once evidence has been provided.

So while both types of pension can help reduce the income figure used by CMS, a workplace pension is often more straightforward administratively.

What evidence does CMS need?

If you pay into a private pension directly, rather than through payroll, you should normally be ready to provide proof of your contributions.

The best evidence is usually:

• your annual pension statement for the relevant tax year
• confirmation of any tax relief added to the pension
• where relevant, your HMRC tax calculation if you are claiming higher-rate relief

CMS guidance isthat the evidence should match the tax year being used in the child maintenance calculation.  So if your CMS calculation is based on the 25/26 tax year income, only the 25/26 pension contributions reduce the payment.  Not the money you are paying into a pension this year.

As a practical rule, keep all pension statements safely and make sure the figures you send to CMS clearly cover the correct tax year.

You cannot send the pension details before the annual review is complete.  The computer cant see it.  You send afterwards, and they recalculate.

Timing matters: annual reviews and tax years

CMS reviews cases each year using the latest complete tax year available from HMRC.

That means timing matters.

If you want private pension contributions to be taken into account, it is usually best to make sure your evidence clearly relates to the tax year CMS is using for the annual review.

Sending the right evidence for the wrong year can delay things and cause confusion.

Can CMS say pension contributions are excessive?

Yes, sometimes.

Although pension contributions can reduce the income figure used in the standard CMS calculation, CMS can still look more closely at them if there is an argument that the payments are unusually high and are being made to reduce child maintenance rather than genuinely provide for retirement.

Public CMS guidance says there is no fixed deduction cap in the main calculation, but excessive contributions can still become relevant in a variation or diversion of income argument.

The 12% starting point and age-related guidance

CMS guidance has historically used 12% of gross income as a starting point for deciding whether pension contributions appear reasonable.

Above that level, decision-makers may compare contributions with older Financial Services Authority guidance based on the age at which pension saving began.

The guide ranges often referred to are:

• Age 30: 12% to 18%
• Age 35: 16% to 22%
• Age 40: 18% to 25%
• Age 45: 25% to 30%
• Age 50: 30% to 45%
• Age 55: 45% to 70%

These percentages are best understood as guidance, not a hard legal limit.

That matters, because pension rules and individual circumstances vary widely. Someone may have started a pension years ago but contributed too little, taken breaks, or had poor investment growth. So it is not always fair to treat an old start date as a reason to restrict current pension saving, and this could be used to argue a tribunal decision if CMS dont allow the full amount.

Tax rules and CMS rules are not the same

This is a key point that many people miss.

For tax purposes, the standard annual pension allowance is currently £60,000 per year for most people.

But CMS does not automatically accept that any contribution within the tax allowance must also be reasonable for child maintenance purposes.  They are able to do this because a previous case ruled against a paying parent and determined that a maximum level could be set.

So a contribution may be perfectly valid for pension tax relief, while still being challenged by CMS if it looks excessive in the context of maintenance.

Practical tips if you are paying into a pension

If you are paying child maintenance and want your pension contributions to be taken into account properly, these points can help:

Regular contributions are usually easier to explain than one-off lump sums made at the end of the tax year.

Keep your annual pension statements and any HMRC calculations.

Make sure the evidence you send matches the tax year CMS is using.

If you are a higher-rate taxpayer, keep proof of any additional tax relief claimed through HMRC.

If CMS argues that your contributions are excessive, ask for a clear written explanation and consider challenging the decision if the reasoning does not reflect your actual retirement needs.

Important disclaimer

This blog is about child maintenance rules and CMS practice. It is not financial advice or investment advice.

Before making any pension decision, you should do your own research and consider getting independent financial advice.

Frequently Asked Questions

Do pension contributions reduce child maintenance?

They can. CMS guidance says qualifying pension contributions can reduce the gross income figure used in the maintenance calculation.

Does a private pension count for CMS?

Yes. Private pension contributions can be taken into account, but CMS may ask for evidence such as an annual pension statement.

Is a workplace pension better than a private pension for child maintenance purposes?

Not always, but it is often easier administratively because workplace deductions may already be reflected in the income figure supplied to HMRC.

Can CMS refuse to accept pension contributions?

CMS can look closely at contributions if they appear excessive and may consider them as part of a variation or diversion of income argument.

What proof should I send to CMS?

Usually your annual pension statement for the relevant tax year, and where relevant, HMRC documents showing additional tax relief.

Further Information

Child Maintenance - Book available from Amazon.co.uk

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Child Maintenance Regulations Concerning Pension Contributions

This video guide may help:

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