Massachusetts calculates child support using the income shares model under the 2025 Child Support Guidelines, effective December 1, 2025. Both parents' gross incomes are combined, and a base support amount is drawn from Table A of the official Guidelines Worksheet. The combined income cap is $450,000 per year, the minimum weekly order is $12 for low-income payors, and child support can extend to age 23 for children enrolled in undergraduate education under M.G.L. c. 208, § 28.
Key Facts: Massachusetts Child Support at a Glance
| Category | Details |
|---|---|
| Governing Law | M.G.L. c. 208, § 28 |
| Calculation Model | Income Shares (both parents' incomes combined) |
| Current Guidelines | 2025 Child Support Guidelines (effective December 1, 2025) |
| Combined Income Cap | $450,000/year (increased from $400,000 in 2021 Guidelines) |
| Minimum Weekly Order | $12/week (payors earning under $301/week gross) |
| Filing Fee | $215 complaint + $15 summons surcharge = $230 total |
| Residency Requirement | 1-year domicile or cause occurred in Massachusetts |
| Nisi Waiting Period | 120 days (1A joint) or 90 days after judgment (1B contested) |
| Support Duration | Until age 18; extendable to 21 (dependent) or 23 (undergraduate student) |
| Childcare Cost Cap | $430/child/week (26% increase from 2021 Guidelines) |
How the Massachusetts Child Support Calculator Works
The Massachusetts child support calculator uses the income shares model to determine each parent's obligation based on their proportional share of combined gross income. Under M.G.L. c. 208, § 28, courts must apply the Child Support Guidelines promulgated by the Chief Justice of the Trial Court, and there is a rebuttable presumption that the Guidelines amount is the correct child support order.
The calculation follows a five-step process. First, each parent's gross weekly income is determined. Second, those incomes are combined. Third, the base support amount is looked up in Table A of the Guidelines Worksheet based on the combined income and number of children. Fourth, the base amount is split between parents in proportion to their respective income shares. Fifth, adjustments are applied for health insurance, childcare costs, and parenting time.
For example, if Parent A earns $1,200 per week gross and Parent B earns $800 per week gross, the combined income is $2,000 per week. Parent A contributes 60% and Parent B contributes 40% of combined income. The Table A amount for $2,000/week combined income with one child is approximately $381 per week under the 2025 Guidelines. If Parent B is the custodial parent, Parent A would owe approximately $229 per week ($381 x 60%) before adjustments for insurance and childcare.
Step 1: Determine Each Parent's Gross Income
Massachusetts defines gross income broadly as income from whatever source, regardless of whether that income is reported to the IRS or state Department of Revenue. The 2025 Guidelines explicitly include digital assets, cryptocurrency, and nontraditional compensation as countable income sources. Gross income encompasses salaries, wages, overtime, bonuses, commissions, self-employment earnings, pensions, annuities, Social Security benefits, trust income, rental income, and investment returns.
Specific income sources excluded from the calculation include Transitional Aid to Families with Dependent Children (TAFDC), Supplemental Nutrition Assistance Program (SNAP) benefits, Supplemental Security Income (SSI), and other need-based public assistance programs. These exclusions exist because including need-based benefits would create a circular dependency where support obligations increase as a parent's financial need increases.
Each parent may deduct the following from gross income before calculating their support obligation: the cost of health insurance premiums actually paid for the child, the cost of dental and vision insurance premiums paid for children covered by the order, and other court-ordered support obligations being paid for children from other relationships. These deductions reduce the parent's available income figure used in the Guidelines Worksheet calculation.
Step 2: Combine Incomes and Consult Table A
The 2025 Child Support Guidelines apply to combined parental gross incomes up to $450,000 per year, which equals approximately $8,654 per week. This represents a $50,000 increase from the 2021 Guidelines cap of $400,000. For combined incomes exceeding $450,000, courts have discretion to set support amounts above the Table A maximum, considering the child's needs and the family's standard of living.
Table A of the Guidelines Worksheet provides weekly base support amounts organized by combined weekly income and number of children. The table uses multipliers to adjust the one-child amount for additional children: 1.20 for two children, 1.27 for three children, 1.32 for four children, and 1.35 for five or more children. These multipliers reflect the economic principle that each additional child costs incrementally less than the first child due to shared household expenses.
The 2025 Guidelines also restructured the income thresholds in the first two tranches of Table A. The first tranche threshold increased from $210 to $301 per week, and the second tranche threshold increased from $249 to $391 per week. These increases benefit low-income payors by reducing support obligations at the lowest income levels while still ensuring children receive adequate support.
Step 3: Allocate the Support Obligation
The base support amount from Table A is divided between parents in proportion to their respective shares of combined gross income. The non-custodial parent's proportional share becomes their weekly child support obligation. Massachusetts courts allocate the full proportional share to the non-custodial parent because the custodial parent is presumed to spend their share directly on the child through daily household expenses.
In shared custody arrangements where each parent has the child for at least one-third of the year (approximately 122 overnights), the child support calculator adjusts the obligation. The 2025 Guidelines use a cross-credit formula: each parent's support obligation is calculated as if the other parent had full custody, and the difference between the two amounts becomes the payment from the higher-earning parent to the lower-earning parent. This adjustment reflects the reality that both parents incur direct child-rearing costs during their respective parenting time.
For split custody arrangements where each parent has primary physical custody of at least one child, Massachusetts courts calculate separate support obligations for each parent and offset them against each other. The parent with the higher obligation pays the difference to the other parent as a single net payment.
Step 4: Adjust for Health Insurance and Childcare
Health insurance costs for the child are allocated between parents in proportion to their income shares under the 2025 Guidelines. If the non-custodial parent carries the child on their employer-sponsored health plan at a cost of $200 per month, and that parent earns 60% of combined income, the custodial parent must reimburse 40% of that premium ($80/month). Massachusetts courts require that the child be covered under the most cost-effective plan available to either parent, as mandated by M.G.L. c. 208, § 28.
Childcare costs in the Massachusetts child support calculator are capped at $430 per child per week under the 2025 Guidelines, a 26% increase from the 2021 cap reflecting Massachusetts childcare cost inflation since 2021. Only out-of-pocket childcare costs actually paid by a parent count toward this adjustment; subsidies, employer contributions, and payments by third parties such as grandparents are excluded. Reasonable childcare costs include expenses necessary for the custodial parent to work, attend school, or participate in job training programs.
Unreimbursed medical expenses for the child exceeding $250 per year per child are split between parents in proportion to their income shares. These include copays, deductibles, prescriptions, orthodontia, therapy, and other medically necessary expenses not covered by insurance.
Step 5: Review and Deviation Factors
Massachusetts courts may deviate from the Guidelines amount when applying the presumptive support figure would be unjust or inappropriate. The 2025 Guidelines list specific factors courts consider when evaluating a deviation request, including the child's special needs or aptitudes, the standard of living the child would have enjoyed if the family remained intact, and extraordinary travel costs for parenting time. Courts must document their reasons for any deviation in writing.
The 2025 Guidelines introduced updated language regarding attribution of income. When a parent is unemployed or underemployed, Massachusetts courts may attribute income based on that parent's earning capacity, work history, education, and job market conditions. The Guidelines now specify that income attribution should account for the parent's reasonable efforts to find employment and any barriers to employment such as disability, incarceration, or caretaking responsibilities for a young child.
Other deviation factors include: the non-custodial parent's obligation to support children from other relationships, extraordinary medical expenses for either parent, the non-custodial parent's cost of exercising parenting time, and prior agreements between the parties. Massachusetts courts retain broad discretion under M.G.L. c. 208, § 28 to adjust support amounts as equity requires.
What Changed in the 2025 Massachusetts Child Support Guidelines
The 2025 Child Support Guidelines took effect on December 1, 2025, replacing the 2021 Guidelines after a quadrennial review by the Child Support Guidelines Task Force. The most significant change is the combined income cap increase from $400,000 to $450,000 per year, expanding the range of incomes covered by the presumptive Guidelines calculations.
| Change | 2021 Guidelines | 2025 Guidelines |
|---|---|---|
| Combined Income Cap | $400,000/year | $450,000/year |
| First Tranche Threshold | $210/week | $301/week |
| Second Tranche Threshold | $249/week | $391/week |
| Minimum Weekly Order | $12/week | $12/week |
| Childcare Cost Cap | ~$341/child/week | $430/child/week |
| Digital Asset Income | Not addressed | Explicitly included |
| Two-Child Multiplier | 1.20 | 1.20 |
| Three-Child Multiplier | 1.27 | 1.27 |
The 2025 Guidelines also expanded the income definition to expressly include cryptocurrency, digital assets, and non-fungible tokens (NFTs) as countable gross income. While courts previously had discretion to include these sources, the explicit inclusion eliminates ambiguity and reflects the growing prevalence of digital asset ownership in Massachusetts households.
How Long Massachusetts Child Support Lasts
Massachusetts child support obligations continue until the child turns 18 under the standard provisions of M.G.L. c. 208, § 28. However, Massachusetts extends support beyond age 18 in two specific circumstances, making it one of the few states where parents can owe child support into their child's early twenties.
The first extension covers children aged 18 to 20 who are domiciled in a parent's home and principally dependent on that parent for maintenance. The second extension covers children aged 21 to 22 who meet the same domicile and dependency requirements and are enrolled in an educational program, excluding post-graduate education beyond an undergraduate degree. A child who reaches age 23 is considered emancipated as a matter of law, absent extraordinary circumstances.
Child support does not automatically terminate in Massachusetts when a child reaches any age threshold. The paying parent must file a Complaint for Modification with the Probate and Family Court to request termination, and the court must approve the modification. Unilaterally stopping payments without a court order can result in contempt of court proceedings, wage garnishment, and license suspension.
Filing for Child Support in Massachusetts
To file a child support action in Massachusetts, you must meet the residency requirements under M.G.L. c. 208, § 5. The filing parent must have been domiciled in Massachusetts for at least one year before filing, or the cause of the divorce must have occurred within the Commonwealth. The filing fee for a Complaint for Divorce (which includes child support) is $215 plus a $15 summons surcharge, totaling $230 as of March 2026. Verify current fees with your local Probate and Family Court clerk.
Massachusetts offers two divorce tracks that affect child support timelines. A 1A Joint Petition for Divorce, where both spouses agree on all terms including child support, can be heard on the same day it is filed. The judgment becomes final 120 days after the hearing (30 days to Judgment Nisi plus 90 days to Judgment Absolute). A 1B Contested Divorce, filed by one spouse, requires a 6-month waiting period before trial plus a 90-day nisi period after judgment.
Parents who cannot afford the filing fee may submit an Affidavit of Indigency to request a fee waiver. The Massachusetts Department of Revenue Child Support Enforcement Division (DOR/CSE) can also assist with establishing, enforcing, and modifying child support orders at no cost to the custodial parent.
Using the Online Child Support Calculator for Massachusetts
The Massachusetts Trial Court publishes the official Child Support Guidelines Worksheet as a fillable PDF form (Form PFC-001) available at courtforms.jud.state.ma.us. This worksheet mirrors the exact calculation courts use when setting child support orders. The divorce.law child support calculator for Massachusetts provides an interactive version that walks you through each input field and explains what each number means.
To use the child support calculator for Massachusetts accurately, gather these documents before starting: both parents' three most recent pay stubs (for gross weekly income), the cost of health insurance premiums for the child, the cost of childcare per week, any court-ordered support payments for other children, and the approximate number of annual overnights each parent has with the child. The calculator requires weekly income figures; divide annual salary by 52, monthly salary by 4.33, or biweekly salary by 2 to convert.
The Massachusetts child support calculator produces a presumptive weekly support amount that courts treat as the correct order in approximately 90% of cases. Judges deviate from the Guidelines amount only when specific factors make the presumptive figure unjust. If you believe your circumstances warrant a deviation, document the specific factors listed in Section II of the 2025 Guidelines and present them to the court with supporting evidence.
Frequently Asked Questions
How is child support calculated in Massachusetts in 2026?
Massachusetts calculates child support using the income shares model under the 2025 Child Support Guidelines, effective December 1, 2025. Both parents' gross weekly incomes are combined and referenced against Table A to determine a base support amount. The non-custodial parent pays their proportional share of the base amount, adjusted for health insurance and childcare costs. The combined income cap is $450,000 per year under M.G.L. c. 208, § 28.
What income counts for the Massachusetts child support calculator?
Gross income for Massachusetts child support includes all income from any source: wages, salaries, overtime, bonuses, commissions, self-employment earnings, pensions, Social Security, rental income, trust income, investment returns, and digital assets including cryptocurrency. Need-based public assistance (TAFDC, SNAP, SSI) is excluded. Parents may deduct health insurance premiums paid for the child, dental/vision insurance for the child, and other court-ordered child support obligations.
What is the minimum child support payment in Massachusetts?
The minimum weekly child support order in Massachusetts is $12 per week for payors earning under $301 per week gross under the 2025 Guidelines. This threshold increased from $210 per week in the 2021 Guidelines. For payors with gross income between $301 and $391 per week, the second tranche of Table A applies with graduated amounts. Courts may order $0 in support only when the payor's income falls below the poverty level and ordering any payment would deprive the payor of basic necessities.
How long does child support last in Massachusetts?
Massachusetts child support continues until the child turns 18 under M.G.L. c. 208, § 28. Support extends to age 21 if the child is domiciled with a parent and principally dependent on that parent. Support can extend to age 23 if the child meets the same dependency requirements and is enrolled in an undergraduate educational program. A child reaching age 23 is emancipated as a matter of law. Child support does not terminate automatically; the paying parent must file a Complaint for Modification.
Can Massachusetts child support be modified after the order is set?
Yes. Either parent can file a Complaint for Modification with the Probate and Family Court at any time before the child is emancipated. Massachusetts requires a material change in circumstances to modify support, such as a job loss, significant income increase or decrease, change in custody arrangement, or change in the child's needs. The court applies the current Guidelines (2025 as of December 2025) to the modification, which may itself produce a different amount than the original order.
How does shared custody affect the Massachusetts child support calculation?
When each parent has the child for at least one-third of the year (approximately 122 overnights), Massachusetts uses a cross-credit formula. Each parent's support obligation is calculated as if the other parent had full custody, and the parent with the higher obligation pays the difference. For example, if Parent A would owe $300/week and Parent B would owe $150/week, Parent A pays $150/week net. The 2025 Guidelines maintain this approach for shared custody arrangements.
What happens if a parent is unemployed or underemployed in Massachusetts?
Massachusetts courts may attribute income to a parent who is voluntarily unemployed or underemployed under the 2025 Guidelines. The court examines the parent's education, work history, earning capacity, job market conditions, and efforts to find employment. Attribution is not automatic; courts consider barriers to employment including disability, incarceration, and primary caretaking of a young child. If income is attributed, the child support calculator uses the attributed amount rather than actual earnings.
How much does it cost to file for child support in Massachusetts?
The filing fee for a Complaint for Divorce in Massachusetts Probate and Family Court is $215 plus a $15 summons surcharge, totaling $230. E-filing for 1A joint petitions carries an additional $22 processing fee. Parents who cannot afford the fee may file an Affidavit of Indigency for a fee waiver. The Massachusetts Department of Revenue Child Support Enforcement Division (DOR/CSE) can establish or enforce child support orders at no cost to the custodial parent. As of March 2026. Verify with your local clerk.
Does the Massachusetts child support calculator account for childcare costs?
Yes. The Massachusetts child support calculator includes childcare costs capped at $430 per child per week under the 2025 Guidelines, a 26% increase from the 2021 cap. Only out-of-pocket expenses actually paid by a parent count; employer subsidies, government assistance, and third-party payments (such as from grandparents) are excluded. Qualifying childcare expenses must be necessary for the parent to work, attend school, or participate in job training. Both parents share childcare costs in proportion to their income shares.
What is the difference between the 2021 and 2025 Massachusetts Child Support Guidelines?
The 2025 Guidelines increased the combined income cap from $400,000 to $450,000 per year, raised the first-tranche income threshold from $210 to $301 per week, increased the childcare cost cap from approximately $341 to $430 per child per week, and explicitly added digital assets and cryptocurrency to the gross income definition. The child multipliers (1.20 for two children, 1.27 for three, 1.32 for four, 1.35 for five) remain unchanged. The 2025 Guidelines took effect December 1, 2025.