How to Modify Child Support in Massachusetts
Reviewed by DocDraft Legal Team · Massachusetts · Last updated September 21, 2026
In Massachusetts, a child support modification is a court or the state child support agency changing the amount of an existing child support order after circumstances change, and unlike states that require a separate material change, Massachusetts lets you modify by showing an inconsistency between your current order and the amount the Child Support Guidelines would produce today (MGL c.208 s.28). Support is set by statewide guidelines issued by the Chief Justice of the Trial Court and tied to each parent's income, so a raise, a job loss, or a new health coverage need can make the current amount inconsistent with the guidelines. You can seek a change two ways. You can file a Complaint for Modification (Form CJD 104) with the Probate and Family Court in the county where your judgment issued, or, if the Department of Revenue Child Support Services (DOR/CSE) handles your case, you can ask it to review your order. A change takes effect only back to the date the other parent receives notice of your complaint, not to when your circumstances changed, and support that already came due cannot be wiped out (MGL c.119A s.13). If DOR provides full services, you can also request a review about every three years. Keep paying your current order until it is changed. Attorney review of your filing is available through DocDraft.
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Where are you with changing your child support order?
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How do I modify child support in Massachusetts?
File a Complaint for Modification (Form CJD 104) with the Probate and Family Court in the county where your judgment issued, or ask the Department of Revenue to review your order if it handles your case. You qualify by showing an inconsistency between your current order and the Child Support Guidelines amount (MGL c.208 s.28).
How much does my order have to differ to modify child support in Massachusetts?
Massachusetts does not require a separate percentage change or a material change in circumstances. You qualify if there is an inconsistency between the amount of your existing order and the amount that would result from applying the current Child Support Guidelines today (MGL c.208 s.28). A changed health coverage need can also qualify.
How far back can a child support change go in Massachusetts?
A modification can date back only to the date the other parent receives notice of your Complaint for Modification, not to when your circumstances changed (MGL c.119A s.13). Support that already came due becomes a judgment and cannot be reduced retroactively, so filing promptly protects you. Keep paying until the order changes.
Which court handles child support modifications in Massachusetts?
The Probate and Family Court in the county where your existing judgment issued handles modifications. If the Department of Revenue Child Support Services manages your case, you can also ask it to review your order and, if warranted, take the change to court. Both apply the statewide Child Support Guidelines.
Massachusetts child support modification at a glance
In Massachusetts, a child support modification is a court or agency changing an existing support order, and the state uses an inconsistency-with-guidelines standard: you can modify by showing an inconsistency between your current order and the amount the Child Support Guidelines would produce today, without proving a separate material change in circumstances (MGL c.208 s.28). Support follows statewide guidelines issued by the Chief Justice of the Trial Court and tied to each parent's income. You file a Complaint for Modification (Form CJD 104) with the Probate and Family Court where your judgment issued, or ask the Department of Revenue Child Support Services to review your order. A change applies back only to the date the other parent receives notice of your complaint, so support that already came due cannot be reduced (MGL c.119A s.13).
Lowering a Massachusetts order after a layoff
Suppose you have a Massachusetts order set three years ago, and because Massachusetts uses an inconsistency-with-guidelines standard, you do not need a separate material change: you only show that your current order is inconsistent with what the Child Support Guidelines produce today (MGL c.208 s.28). Your income dropped after a layoff, so you complete a Complaint for Modification (Form CJD 104) with a current financial statement and file it with the Probate and Family Court where your judgment issued. You have the other parent served, because a change dates back only to the date notice is received (MGL c.119A s.13). You keep paying the current amount until the court rules. At the hearing the court recalculates support under the guidelines and enters a lower order effective from the notice date. Attorney review of your filing is available through DocDraft.
Relevant Laws
MGL c.208 s.28 (modification of child support)
Provides that orders for support of minor children shall be modified if there is an inconsistency between the amount of the existing order and the amount that would result from application of the child support guidelines, or if there is a need to provide for the child's health care coverage.
MGL c.119A s.13 (retroactive modification limit)
Provides that each payment of support is a judgment by operation of law on the date it is due and is not subject to retroactive modification except from the date notice of a pending complaint for modification is given to the other party, so accrued support cannot be reduced.
Massachusetts Child Support Guidelines, Section III (modification)
The Trial Court guidelines explain when a child support order may be modified, including the inconsistency-with-guidelines standard and the treatment of health care coverage, and are the framework the court applies when recalculating support.
Mass.gov: file to change your child support (one person)
The Probate and Family Court self-help page explains how to change a child support order when only one parent wants the change, which form to use (Complaint for Modification, Form CJD 104), and where to file.
Regional Variances
Massachusetts child support modification rules at a glance
Qualifying threshold
Massachusetts uses an inconsistency-with-guidelines standard: you qualify if there is an inconsistency between your existing order and the amount the current Child Support Guidelines would produce, with no separate material change required (MGL c.208 s.28). A changed health coverage need can also qualify.
Where to file
The Probate and Family Court in the county where your judgment issued. If the Department of Revenue Child Support Services provides full services on your case, you can also ask it to review your order and, if warranted, take the change to court.
Modification form
The Complaint for Modification (Form CJD 104) when only one parent wants the change, filed with a current financial statement. When both parents agree, a Joint Petition to Change a Judgment (Form CJD 124) can be used. Forms are free on mass.gov.
Retroactivity
A modification can date back only to the date the other parent receives notice of your complaint (MGL c.119A s.13). Each installment becomes a judgment when due, so support that already came due cannot be reduced retroactively.
Periodic review
If the Department of Revenue provides full services on your case, you can generally request a review about every three years without showing a change, and sooner when your order becomes inconsistent with the guidelines.
Suggested Compliance Checklist
Estimate the current guideline amount
Before you file days after startingGather current pay and income proof for both parents and estimate what the Massachusetts Child Support Guidelines would produce now, then compare it to your existing order to confirm an inconsistency (MGL c.208 s.28). Attorney review of your filing is available through DocDraft.
Complete the Complaint for Modification (CJD 104)
As soon as your order is inconsistent with the guidelines days after startingFill out Form CJD 104, explain how circumstances have changed and why the current order is inconsistent with the guidelines, and prepare a current financial statement. Use the free Probate and Family Court forms and instructions on mass.gov.
File with the Probate and Family Court
Promptly (a change dates back only to notice) days after startingFile your Complaint for Modification with the Probate and Family Court in the county where your judgment issued and pay the fee, or request a fee waiver with an Affidavit of Indigency. Filing promptly protects the earliest effective date (MGL c.119A s.13).
Serve the other parent
Right after filing days after startingHave the other parent served with the complaint and summons, then file proof of service. A modification can date back only to the date the other parent receives notice, so completing service quickly matters (MGL c.119A s.13).
Request a DOR review if it handles your case
Anytime DOR provides full services days after startingIf the Department of Revenue Child Support Services provides full services on your case, ask it to review your order. DOR examines both parents' income and decides whether to ask the court for a change, at no cost to you.
Attend the hearing and get the new order
On your hearing date days after startingGo to the hearing with your income proof and guideline calculation, let the court decide whether to modify, and get the signed order effective back to the notice date. Keep paying the current order until it is changed.
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Estimate the current guideline amount | Gather current pay and income proof for both parents and estimate what the Massachusetts Child Support Guidelines would produce now, then compare it to your existing order to confirm an inconsistency (MGL c.208 s.28). Attorney review of your filing is available through DocDraft. | - | Before you file |
| Complete the Complaint for Modification (CJD 104) | Fill out Form CJD 104, explain how circumstances have changed and why the current order is inconsistent with the guidelines, and prepare a current financial statement. Use the free Probate and Family Court forms and instructions on mass.gov. | - | As soon as your order is inconsistent with the guidelines |
| File with the Probate and Family Court | File your Complaint for Modification with the Probate and Family Court in the county where your judgment issued and pay the fee, or request a fee waiver with an Affidavit of Indigency. Filing promptly protects the earliest effective date (MGL c.119A s.13). | - | Promptly (a change dates back only to notice) |
| Serve the other parent | Have the other parent served with the complaint and summons, then file proof of service. A modification can date back only to the date the other parent receives notice, so completing service quickly matters (MGL c.119A s.13). | - | Right after filing |
| Request a DOR review if it handles your case | If the Department of Revenue Child Support Services provides full services on your case, ask it to review your order. DOR examines both parents' income and decides whether to ask the court for a change, at no cost to you. | - | Anytime DOR provides full services |
| Attend the hearing and get the new order | Go to the hearing with your income proof and guideline calculation, let the court decide whether to modify, and get the signed order effective back to the notice date. Keep paying the current order until it is changed. | - | On your hearing date |
Frequently Asked Questions
A genuine income drop can make your order inconsistent with the guidelines, which is grounds to modify in Massachusetts (MGL c.208 s.28). You must file a Complaint for Modification; support keeps accruing at the old rate until the court acts (MGL c.119A s.13). Do not simply stop paying.
No. Either parent can file a Complaint for Modification (Form CJD 104) alone, and the other parent is served and can respond. If both parents agree on a new amount, they can instead file a Joint Petition to Change a Judgment (Form CJD 124) for the court to approve.
After you file the Complaint for Modification, the Probate and Family Court schedules the case, which can take several weeks to a few months depending on the county. An agreed change or a Department of Revenue review can move faster. Because a change dates back only to the notice date, file promptly (MGL c.119A s.13).
If DOR Child Support Services provides full services on your case, you can ask it to review your order. DOR examines both parents' income and decides whether to ask the court for a change. DOR cannot change the order itself; a judge enters any new order, but the review costs you nothing.
You can file whenever your order becomes inconsistent with the current guidelines (MGL c.208 s.28). If the Department of Revenue provides full services, you can generally request a review about every three years even without a change, under federal rules. There is no limit on filing when an inconsistency genuinely exists.
Each installment becomes a judgment by operation of law when it is due and cannot be reduced retroactively (MGL c.119A s.13). A modification changes support only from the date the other parent receives notice of your complaint forward. Keep paying your current order to avoid building arrears while the case is pending.
You file the Complaint for Modification (Form CJD 104) with the Probate and Family Court when only one parent wants the change, and attach a current financial statement. When both parents agree, you can file a Joint Petition to Change a Judgment (Form CJD 124). Both forms are free on mass.gov.
Filing a Complaint for Modification in the Probate and Family Court carries the standard filing fee, but you can ask the court to waive it with an Affidavit of Indigency if you cannot afford it. Asking the Department of Revenue to review your order does not charge you a fee.
Other Massachusetts guides
Asset Protection Planning in Massachusetts (2026)
Dealing With Debt Collectors in Massachusetts (2026)
Expunging a Criminal Record in Massachusetts (2026)
Filing a Workplace Harassment Complaint in Massachusetts
Filing Chapter 7 Bankruptcy in Massachusetts (2026)
Firing an Employee in Massachusetts (2026)
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