How to split the kids’ expenses

Start with what you already agreed

Many parents already have a parenting plan or a court order that says something about extra costs for the kids. Some plans name a split. Some say only that extras are shared. Some say nothing at all. Read yours first, because whatever it says is the starting point for everything below.

A plain guide, not legal advice: your parenting plan or court order decides what each of you pays.

If your plan leaves room, the rest of this guide covers the ways parents usually fill it in.

Three common ways to split

Many arrangements are one of these, or a mix of them.

An even split 50/50

Each of you pays half of every shared expense. It is the easiest to explain and to check, and it often fits parents with similar incomes and similar time with the kids.

A split in proportion to income for example, 60/40

Each of you pays a share that matches your part of your combined income. The two of you agree on the figures and the percentage, then use that percentage for every expense until you agree to change it.

Different splits by category

Some parents split medical costs one way and activities another, or have one parent cover school supplies in full while childcare is shared. It takes more setting up, and it can match how your family really runs.

Try a split

Enter an expense and a split to see each parent’s share. Cents are rounded so the two shares always add up to the total.

Choosing one together

A split works when both of you would describe it the same way. A few habits help you get there.

• Talk about it apart from any one bill. Deciding the rule while a specific receipt is waiting turns the rule into a debate about that receipt.
• Pick one default. Even if some categories end up different, a default split covers everything you did not think of.
• Say it back in one sentence. “We split shared costs 60/40, and the parent who pays logs it within a week.” If you both agree with the sentence, you have a rule.
• Choose when to look at it again. Once a year, or when a big change happens, like a new school or a new job. Knowing there is a review date makes the current split easier to accept.

Write down what counts

The split only answers how much. You also need to agree on which costs it applies to. Childcare and uncovered medical bills are commonly shared; a new phone or a birthday gift for a classmate may not be. Write the list down where both of you can see it, and keep it short enough to read in a minute.

The guide on what counts as a shared expense has the usual categories and a checklist you can go through together.

When something new comes up

Sooner or later there is a cost neither of you planned for: a school trip, a tutor, a second season of a sport. When it happens:

• Ask before you spend, when there is time. One short message with the item, the cost, and the split you are proposing.
• Decide this one, not all future ones. “Yes to this trip at 50/50” is easier to agree on than a new rule for every trip.
• Record the answer with the expense. When the agreement sits next to the receipt, nobody has to remember what was said.

If the same kind of cost keeps coming up, that is the time to add it to your written list.