Regulation 50 Explained: Who Pays When Care is Shared?

When both parents share significant day-to-day care of a child, the Child Maintenance Service (CMS) faces an immediate problem: who is the non-resident parent who pays, and who is the person with care who receives? The answer is found in Regulation 50 of The Child Support Maintenance Calculation Regulations 2012 (SI 2012/2677). This article explains what Regulation 50 says, how it interacts with the overnight stay rules in Regulation 46, and the full checklist of what does and does not count as a qualifying night.

The Legal Framework

The Child Support Maintenance Calculation Regulations 2012 (SI 2012/2677) sit beneath the Child Support Act 1991 and set out the detailed rules for how the CMS calculates and applies maintenance. Part 4 of the regulations covers the maintenance calculation rules themselves. Within Part 4:

• Regulation 46 - defines what counts as an overnight stay and how nights are counted
• Regulation 47 - sets a default assumption of 1 night per week where no pattern is yet established
• Regulation 48 - deals with qualifying maintenance arrangements for relevant other children
• Regulation 50 - determines who is treated as the non-resident parent in shared care cases

What Regulation 50 Actually Says

Regulation 50 is headed "Parent treated as a non-resident parent in shared care cases." It applies where both parents provide a home for the child and share day-to-day care between two separate households. The core rule is straightforward:

When it is not immediately obvious who provides the greater share of care, Regulation 50(3) sets out a presumption:

This makes Child Benefit receipt the default tiebreaker. If you claim Child Benefit, the CMS will presume you are the primary carer. The other parent will be treated as the non-resident parent unless they can provide evidence to the contrary.

Regulation 50(4) adds a further rule for parents who have opted out of Child Benefit under section 13A(1) of the Social Security Administration Act 1992 (the high-income Child Benefit charge opt-out): they are treated as if they were still receiving Child Benefit for the purposes of this presumption. Opting out does not remove the presumption.

The Child Benefit Tiebreaker in Practice

In genuinely shared care situations, the parent who claims Child Benefit almost always ends up as the person with care who receives maintenance. This has practical consequences:

• Whoever currently claims Child Benefit for the child will likely be treated as the primary carer by the CMS
• The other parent will be treated as the non-resident parent and will owe maintenance
• If you have opted out of Child Benefit to avoid the high income charge, the CMS still treats you as if you receive it
• The presumption can be rebutted by evidence - but the burden falls on the person challenging it
• Evidence must show who actually provides the greater share of day-to-day care across the full year

How the CMS Decides if You Are a Non-Resident Parent

Before Regulation 50 applies at all, the CMS must first establish whether someone is a non-resident parent. This is defined in Section 3 of the Child Support Act 1991. A parent is a non-resident parent if:

• They are not living in the same household as the child; and
• The child has their home with a person who is a person with care

A "person with care" is someone with whom the child has their home, who usually provides day-to-day care for that child (whether exclusively or with another person). Both parents can be persons with care simultaneously - which is exactly when Regulation 50 kicks in to decide who pays.

The CMS Non-Resident Parent Checklist

In practice, when the CMS receives an application and residency is disputed, it works through the following questions in order. These are derived from Section 3 CSA 1991, Regulation 50, and published CMS decision-making guidance.

Step 1 - Are the parents living apart?

• Living in the same household? Neither parent is a non-resident parent. The CMS framework does not apply and no maintenance calculation can be made
• Living apart in separate households? Move to Step 2

Note: "household" is not the same as "address." Two people can share an address but run separate households (for example a house divided into flats). The CMS looks at whether they share domestic arrangements - meals, finances, living space - not just the postal address.

Step 2 - Does the child have a home with each parent?

• Child lives only with one parent - that parent is the person with care; the other is the non-resident parent. The calculation proceeds under the standard rules
• Child has a home with both parents - this is a shared care situation. Move to Step 3 (Regulation 50 applies)

"Has their home" means the child ordinarily lives there - it is where they are based, keep their belongings, and return to. A child can have a home with two parents simultaneously.

Step 3 - Who provides day-to-day care to a greater extent?

This is the core Regulation 50 question. The CMS considers a range of evidence about who actually does more of the caring. Day-to-day care includes:

• Getting the child up, fed, and ready for school or nursery
• School drop-off and collection
• Attending medical and dental appointments
• Overseeing homework and school communication
• Providing meals and bedtime routines
• Managing the child's social life, activities, and friendships
• Overnight care (the child sleeping at that address)
• Being the emergency contact and main point of contact for school and health services

Step 4 - Apply the Child Benefit presumption (Regulation 50(3))

Where the day-to-day care balance is not clear from evidence, the CMS applies the Regulation 50(3) presumption:

• Parent claiming Child Benefit - presumed to provide greater day-to-day care. Treated as the person with care. Receives maintenance
• Parent not claiming Child Benefit - presumed to provide lesser day-to-day care. Treated as the non-resident parent. Pays maintenance
• Parent who opted out of Child Benefit (high income charge) - still treated as receiving it under Regulation 50(4). The opt-out does not remove the presumption

Step 5 - Can the presumption be rebutted?

Either parent can challenge the Child Benefit presumption, but the burden of proof falls on them to provide evidence. Evidence the CMS will consider includes:

• A court order specifying who the child lives with (a "lives with" child arrangements order)
• School records showing which parent is the primary contact and at which address the child is registered
• GP and medical records showing the registered address
• A detailed diary or log of actual overnight stays and caring responsibilities over a 12-month period
• Witness statements from teachers, health visitors, or other professionals
• Evidence of who pays for clothing, food, school trips, and activities
• Bank records showing who buys child-related goods and services

What if neither parent can be identified as providing more care?

Where care is genuinely equal and neither parent holds Child Benefit, or the presumption is successfully rebutted and no clear answer emerges, the CMS will look at all available evidence holistically. In practice, this is rare - the Child Benefit presumption resolves most cases. Where it remains genuinely unclear, the CMS may request additional evidence or, ultimately, refer the matter for formal determination.

Regulation 46: What Counts as an Overnight Stay

Once the CMS has established who is the non-resident parent, Regulation 46 governs whether - and by how much - the maintenance payment is reduced based on overnight stays. A reduction only applies if the non-resident parent has the child overnight for at least 52 nights per year.

Regulation 46(5) provides the legal definition:

Both conditions must be met simultaneously - the child must physically be at the non-resident parent's address, and the non-resident parent must be providing care. There is no credit for daytime care, however long or involved.

The Overnight Stay Checklist

Based on Regulation 46, Regulation 47, and published CMS guidance, the following sets out what does and does not qualify as a counting night.

Nights that DO count

• The child physically sleeps overnight at the non-resident parent's home and the non-resident parent is providing care
• Regular weekly overnight contact (for example, every other weekend from Friday to Sunday night)
• School holiday nights where the child stays over at the non-resident parent's address
• Nights covered by a court order for contact - the CMS treats a court order as the strongest possible evidence
• Nights where the child is a boarder at a boarding school or an in-patient in hospital - the parent who would normally have had the child that night is treated as having care for it (Reg 46(5)(c))
• Nights agreed in a written or verbal contact agreement between the parties

Nights that do NOT count

• Daytime-only contact, regardless of duration - even a full day from 7am to 11pm does not count
• Picking up and dropping off without the child sleeping over
• Nights the child spends at the non-resident parent's parents, siblings, or other relatives arranged by the non-resident parent
• Nights at a friend's house arranged by the non-resident parent
• Nights where the child stays at a different address from the non-resident parent (for example a partner's home where the non-resident parent is not present)
• Time spent at holiday clubs, activity camps, or similar arrangements not at the non-resident parent's address
• Nights when the non-resident parent is absent (for example working away) even if the child is at their property with another adult

Regulation 47: The Default Assumption

Regulation 47 applies where both parents agree in principle that care will be shared, but there is not yet enough evidence to determine the actual number of nights - for example because the arrangement is new, disputed, or not yet settled. In that situation, the CMS may assume 1 night per week (52 nights per year) until a supersession application is made with sufficient evidence.

This default matters because 52 nights is the minimum threshold to trigger the first tier of reduction (1/7 deducted from the payment). If the actual arrangement is higher, it is worth gathering evidence and applying for supersession as quickly as possible.

How Nights Reduce Your Payment

Once the number of qualifying nights is established, Schedule 1, paragraph 7 of the Child Support Act 1991 sets the reduction fractions applied to the maintenance calculation:

• 0 to 51 nights - no reduction
• 52 to 103 nights - 1/7 deducted from the standard amount
• 104 to 155 nights - 2/7 deducted from the standard amount
• 156 to 174 nights - 3/7 deducted, then a further £7 per week subtracted
• 175 or more nights - 1/2 deducted, then a further £7 per week subtracted

At 156 nights or more, if the reduction would take the payment below £7 per week, the minimum payable is £7 per week (unless the nil rate applies). The £7 per week figure at the higher bands reflects an expectation that the receiving parent's housing and essential costs shift when the child is spending so much time with the non-resident parent.

How the CMS Determines the Number of Nights

Under Regulation 46(4), the CMS must consider evidence in the following order of preference:

• A court order setting out the contact arrangement - this is the strongest evidence and the CMS will generally follow it
• A written agreement between both parents setting out the expected schedule
• An established pattern of shared care already in place over the past 12 months
• Where none of the above exist but both parents agree care will be shared, the Regulation 47 default of 52 nights may be applied

The CMS assessment is forward-looking - it is based on the expected number of nights over the 12 months from the effective date of the calculation, not a retrospective count. However, a past pattern is used as evidence of what is expected going forward.

Practical Points to Know

• Child Benefit is the default tiebreaker for who pays and who receives - whoever holds it is presumed to be the primary carer
• Opting out of Child Benefit to avoid the high income charge does not remove the Regulation 50 presumption
• Overnight stays must be at the non-resident parent's address - stays elsewhere arranged by them do not count
• Daytime contact, however extensive, never counts toward the night reduction
• A court order is the strongest evidence you can provide to the CMS for shared care nights
• If no pattern is established, the CMS defaults to 52 nights per year under Regulation 47
• 52 nights is the minimum threshold to get any reduction at all - below that, you pay the full amount regardless of daytime contact
• Supersession is the mechanism to update the night count if circumstances change

View Regulation 50 on legislation.gov.uk  |  View Regulation 46 on legislation.gov.uk