Child support in Massachusetts works through an income-shares formula: the court looks at both parents’ gross income, subtracts certain costs, factors in health insurance and childcare, and produces a presumptive weekly amount under the 2025 Child Support Guidelines, which took effect December 1, 2025. The order is entered by the Probate and Family Court, payments almost always run through the Department of Revenue by wage withholding, and the obligation typically continues past a child’s 18th birthday. The same framework applies whether the parents are married, divorcing, unmarried, or never lived together.1Mass.gov. 2025 Child Support Guidelines: Introductory Material
How the Amount Is Calculated
The calculation starts with each parent’s gross income from every source, not just wages. That includes salaries, overtime, tips, bonuses, commissions, self-employment earnings, Social Security retirement and disability, veterans’ benefits not based on financial need, workers’ compensation, unemployment, pensions, rental income, trust distributions, capital gains that function as regular income, and lottery winnings. Whether the money is reported to the IRS doesn’t matter. Public assistance benefits like TAFDC, SNAP, and Supplemental Security Income are left out.2Mass.gov. 2023 Child Support Guidelines Section I: Income Definition
From gross income, the worksheet subtracts health insurance premiums, dental and vision coverage for the children, and existing court-ordered support for children from other relationships. A parent supporting other children in their household without a court order can deduct a hypothetical amount for those children. What remains is called available income, and each parent’s share of the combined total sets their proportionate responsibility.3Mass.gov. Child Support Guidelines 2025
Work-related childcare is shared between parents in proportion to income, capped at $430 per week per child. Health insurance premiums for the children factor in on top of that, with each parent credited for the reasonable cost they actually pay.3Mass.gov. Child Support Guidelines 2025
Parenting time changes the math. The guidelines treat one-third of parenting time as a key threshold: when a parent has substantially less than one-third, or substantially more than one-third but less than half, the court can adjust the amount up or down from the standard calculation.4Mass.gov. 2025 Child Support Guidelines Section IV: Deviation
Self-Employment and Imputed Income
If a parent is self-employed, income is defined as gross receipts minus the ordinary and necessary expenses required to produce that income. The guidelines specifically warn that this figure will often differ from what shows up on a tax return. Depreciation is a common example: it is not an out-of-pocket expense, so a judge may treat those dollars as available for support even though the IRS allows the deduction. Expense reimbursements, personal use of business property, and personal expenses paid through a business can also be counted as income when they meaningfully reduce the parent’s living costs.3Mass.gov. Child Support Guidelines 2025
A parent also cannot escape support by refusing to work or by taking a lower-paying job without a real reason. When the court finds a parent could earn more through reasonable effort, the judge can attribute income based on earning capacity rather than actual earnings. The analysis weighs education, job skills, training, health, criminal record, work history, job-search efforts, and whether jobs at the imputed level are actually available locally, along with the age, number, and needs of the children. Incarceration is one situation the court cannot treat as voluntary unemployment; income is not imputed to a parent simply because they are in prison.5Mass.gov. 2025 Child Support Guidelines Section I: Income Definition
When a Judge Can Deviate From the Guidelines
The number the worksheet produces carries a rebuttable presumption: the court assumes it is correct unless a party shows a good reason to move off it. Grounds the guidelines list include a child’s ongoing extraordinary physical, mental, or developmental needs; unusually high costs for health insurance, travel for parenting time, or childcare; a child with more than two legal parents; a payor whose guideline obligation would take 40% or more of available income, which is presumed to create substantial hardship; a guideline amount that would leave a parent unable to support themselves; and a gross disparity in living standards between the two households.4Mass.gov. 2025 Child Support Guidelines Section IV: Deviation
Parents can also agree to a different amount, but the court has to review the agreement and find it fair and reasonable before entering it as an order.
Getting an Order in Place
How you start depends on whether the parents are married. Married parents file a Complaint for Divorce under M.G.L. c. 208, and support is handled inside that case. Unmarried parents file a Complaint for Support-Custody-Parentage under M.G.L. c. 209C, which lets the court establish parentage and order support in the same action. If parentage has not already been established through a voluntary acknowledgment, the court decides that as part of the case.6General Court of Massachusetts. Massachusetts Code Chapter 209C Section 1
Filing fees vary. A complaint for support of a child under G.L. c. 209, § 32F has no fee. A separate support complaint is $115. A complaint for modification is $50. Cases filed by DOR’s IV-D program carry no fee.7Mass.gov. Probate and Family Court Filing Fees After filing, the court issues a summons that must be legally served on the other parent, and a hearing to set a temporary order usually follows within several weeks.
Every parent in a support case has to file a Rule 401 Financial Statement. Parents earning under $75,000 a year use the short form; those at or above $75,000 use the long form. Both require a weekly breakdown of housing, utilities, food, transportation, and other expenses.8Mass.gov. Supplemental Probate and Family Court Rule 401 – Financial Statement Bring documentation to back up the numbers: recent pay stubs, last year’s federal tax return, proof of health insurance premiums, and childcare receipts. Self-employed parents should bring profit-and-loss statements and business tax returns, because the court will scrutinize those expenses independently. The statement has to be filed within 45 days of service of the summons and delivered to the other parent.9Massachusetts Court System. Supplemental Probate Court Rule 401 Financial Statements
How Payments Are Made
Most orders route payments through the Department of Revenue. The default mechanism is a wage assignment: the paying parent’s employer withholds the support amount from each paycheck, sends it to DOR, and DOR forwards it to the receiving parent.10Mass.gov. Learn About Receiving Child Support DOR keeps a record of every payment, which is what matters if there is ever a dispute about who paid what. Handing cash or writing checks directly to the other parent leaves no official trail, and DOR will treat those payments as nonpayment.11Mass.gov. How to Pay Child Support
Either parent can enroll in DOR’s IV-D services, which cover establishing parentage, getting a new order, modifying an existing one, and enforcement.12Mass.gov. Learn the Benefits of Child Support Services and Enroll
What Happens If a Parent Doesn’t Pay
Enforcement tools escalate fast. The Registry of Motor Vehicles can suspend or revoke a delinquent parent’s learner’s permit, driver’s license, right to operate, and vehicle registration indefinitely.13Mass.gov. Child Support The receiving parent can file a Complaint for Contempt in Probate and Family Court, and a contempt finding can result in jail time. At the federal level, arrears above $2,500 can lead to passport denial or revocation. DOR can also intercept tax refunds, report arrears to credit bureaus, and place liens on real estate and financial accounts. These tools apply whether the case runs through DOR or was filed by a parent directly.
Changing an Order Later
Either parent can file a Complaint for Modification in the Probate and Family Court. The fee is $50, or nothing if DOR files it.7Mass.gov. Probate and Family Court Filing Fees The requesting parent has to show a material and substantial change in circumstances since the last order. Common examples: a significant job loss or raise, a change in where the child lives, or a major shift in health insurance costs.
There is a second path. If the current order is inconsistent with the guidelines by a meaningful margin, the court can modify it on that basis alone, even without other life changes.3Mass.gov. Child Support Guidelines 2025 If your existing order was set under an older version of the guidelines, a fresh calculation may be enough. Bring an updated Rule 401 Financial Statement and evidence of the changed circumstances to the hearing.
Health Insurance and Uninsured Medical Costs
Every Massachusetts child support order has to address health coverage. The court can direct either parent to obtain and maintain a policy through an employer plan, a private policy, or public coverage like MassHealth. When both parents have access, the judge picks the plan with the best combination of benefits and cost.
On top of the premium, the custodial parent covers the first $250 per year in routine uninsured medical and dental expenses for all children on the order combined. Once costs exceed $250, the court can order the paying parent to cover all or part of the balance.14Massachusetts Legal Help. Child Support Includes Health Care Keep the receipts. Without them, there is no reliable way to prove what you spent or to ask for reimbursement.
When Child Support Ends
The obligation frequently runs past a child’s 18th birthday. Under M.G.L. c. 208, § 28, the court may order support until age 21 when the child still lives with a parent and is principally dependent on that parent for maintenance. That commonly covers children finishing high school or working while living at home.15General Court of Massachusetts. Massachusetts Code Chapter 208 Section 28
Support can extend to age 23 if the child is enrolled in an educational program and meets the same residency and dependency requirements. The statute excludes educational costs beyond an undergraduate degree, so graduate school is not covered.15General Court of Massachusetts. Massachusetts Code Chapter 208 Section 28 Parallel provisions in M.G.L. c. 209C allow support to age 21 for the children of unmarried parents under similar conditions.6General Court of Massachusetts. Massachusetts Code Chapter 209C Section 1
One thing to know: support does not automatically stop when a child reaches the relevant age. The paying parent generally has to file a motion to terminate the order, and the court verifies the child’s status before ending the obligation. Don’t assume payments stop on a birthday without a court order confirming it.