Massachusetts Child Support and Parenting Time: 2025 Guidelines

How much time your child spends with each parent directly affects the child support calculation in Massachusetts. The 2025 Child Support Guidelines — effective December 1, 2025 — use a unified worksheet that factors in parenting time splits, both parents' incomes, childcare costs, and healthcare expenses to produce a presumptive support amount.

Understanding this connection between schedule and dollars matters whether you're negotiating a parenting plan, filing for support, or considering a modification.

How the 2025 Guidelines Work

Massachusetts uses a single worksheet (Form CJD-304) for all custody arrangements. Both parents' gross incomes are entered, along with childcare costs, health insurance premiums, and the parenting time allocation. The formula produces a presumptive weekly support order.

The three main parenting time scenarios:

Standard Primary Custody (Approximately 2/3 and 1/3)

This is the baseline calculation. The child lives primarily with one parent (roughly 66% of the time) and spends about 33% with the other parent. The non-residential parent pays child support to the residential parent based on the income differential and the number of children.

Shared Physical Custody (Approximately 50/50)

When parents share parenting time approximately equally, the worksheet adjusts automatically. Both parents are assumed to bear direct residential costs (housing, food, utilities) during their respective time. The support calculation accounts for this by reducing the obligation compared to a standard sole-custody arrangement, while still ensuring the lower-earning parent has sufficient resources to maintain the child's standard of living.

Substantially More or Less Than One-Third

If the non-residential parent's time is substantially less than one-third, the court may order an upward adjustment — the residential parent bears nearly all daily costs. If the non-residential parent's time is substantially more than one-third but less than half, the court may apply a downward adjustment to reflect their increased direct spending.

Key Numbers in the 2025 Guidelines

Income cap: The guidelines calculate support on combined available gross income up to $450,000 per year. For income above that threshold, the court has discretion, but any percentage applied to the excess must be lower than the rate applied at the $450,000 level.

Childcare cost cap: Reasonable, actual out-of-pocket childcare costs (for work or education) are shared proportionally between parents. The guidelines cap this at $430 per week per child — reflecting Massachusetts' high childcare costs, particularly for infants and toddlers. Summer camps and structured school-vacation programs count as childcare if they enable a parent to work.

Low-income protections: Parents earning less than $301 per week pay a maximum of $15 weekly. Those earning $302 to $391 per week pay a maximum of $33 weekly. These floors prevent support orders from pushing low-income parents below subsistence.

Hardship presumption: If a child support order requires the payor to pay 40% or more of their total available gross income, there's a rebuttable presumption of substantial hardship. The court may deviate downward.

Healthcare and Uninsured Medical Costs

The court orders one or both parents to maintain health insurance for the child, provided it's available at a "reasonable cost" — defined as coverage that doesn't exceed 5% of the providing parent's gross income. If the child is enrolled in MassHealth, that coverage continues unless private insurance becomes available at a reasonable cost.

Uninsured medical, dental, and vision expenses — copays, deductibles, orthodontics, therapy — are typically split between parents in proportion to their incomes.

The Cavanagh Factor: Child Support and Alimony Together

If your case involves both child support and alimony (spousal support), the 2025 guidelines require what practitioners call the "Cavanagh bake-off," based on the Supreme Judicial Court's Cavanagh v. Cavanagh decision. The court must calculate two scenarios — alimony first, then child support, and vice versa — and compare the after-tax outcomes to determine which structure is most equitable for the family unit.

This is particularly relevant for parents negotiating a 1A uncontested divorce, where the separation agreement must address both support obligations.

Tax Implications of the Parenting Schedule

Child support payments are tax-neutral: non-deductible for the payor, non-taxable for the recipient. But the parenting schedule affects who claims the child as a dependent:

• Federal: The parent with whom the child lives for more than half the year claims the dependent exemption. If the custodial parent agrees to release the claim, they sign IRS Form 8332.
• Massachusetts state: The dependent exemption is capped at $1,000 per qualifying dependent. The state also offers a Child and Family Tax Credit of $440 per eligible child.
• Head of Household status: The custodial parent may file as Head of Household regardless of whether they release the dependency exemption — a significant tax advantage.

When to Seek a Modification

Child support can be modified when there's a material and substantial change in circumstances. Common triggers include:

• A significant change in either parent's income (job loss, promotion, new employment)
• A change in the parenting time allocation
• The child aging out of daycare (reducing childcare costs)
• New health insurance availability or cost changes
• A child turning 18 or graduating from high school (triggering termination or adjustment)

Modifications are filed through a Complaint for Modification (CJD-104) at the Probate and Family Court.

Connecting Schedule and Support

Your parenting plan and your child support obligation are intertwined. A schedule change affects the calculation, and the financial implications of different arrangements should inform your negotiation. The Massachusetts Child Custody & Parenting Plan Guide includes the child support worksheet walkthrough alongside parenting schedule templates, so you can see how different arrangements affect both time and money.

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