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Family Law

What is Modification?

Updated January 24, 2026

A court-approved change to an existing family law order, such as custody, parenting time, child support or alimony, usually based on a substantial change in circumstances since the order was entered.

Family Law

Understanding Modification

Family court orders about children and support can usually be changed after the divorce or custody case ends. The parent or spouse seeking the change typically files a petition or motion and must show a significant change in circumstances, such as a job loss, a large income change, a relocation or a change in the child's needs. Custody modifications also require showing that the change serves the child's best interests. Many states limit how far back a support modification can reach, often no earlier than the filing date. Property division in a divorce judgment is generally final and cannot be modified, and alimony that the parties agreed would be non-modifiable may not be changeable.

Examples

  • 1A reduction in child support after the paying parent is laid off
  • 2A change from alternating weekends to a shared schedule as a child gets older
  • 3An increase in support after the child develops new medical needs

Why This Matters in Legal Cases

Clients often believe an informal agreement with the other parent or ex-spouse changes their obligations. It usually does not: the court order controls until a court modifies it. A paying parent who waits to file after losing a job may keep owing the full amount for months, and those arrears generally cannot be erased later.

Frequently Asked Questions

What counts as a substantial change in circumstances?

It varies by state and by the type of order. Common examples include a significant change in either party's income, job loss, a parent's relocation, a change in the child's needs, or a change in the parenting schedule that has been followed in practice. Some states set numeric thresholds for support changes.

Can I change my child support by agreement with the other parent?

Parents can agree, but the change should be approved by the court to be enforceable. Until the order is modified, the original amount usually stays in effect and unpaid amounts can accumulate as arrears.

Can a property division be modified later?

Generally, no. Property division is usually final once the judgment is entered, except in limited situations such as fraud or a hidden asset. Support and custody orders, by contrast, are typically modifiable.

Sources

Related Terms

Child Support

Ongoing payments made by a non-custodial parent to help cover the costs of raising their child, typically continuing until the child reaches adulthood.

Alimony

Court-ordered financial support paid by one spouse to the other during or after divorce, also known as spousal support or maintenance.

Child Custody

The legal arrangement determining where children will live and who will make important decisions about their upbringing after parents separate or divorce.

Parental Relocation

A move by a parent, with a child, that is far enough to affect an existing custody or parenting time arrangement, which in most states requires the other parent's written consent or court permission.

Divorce

The legal dissolution of a marriage by a court or other competent body, ending the marital relationship and dividing assets, debts, and responsibilities.

Last updated: January 24, 2026
Reviewed by: Quilia Legal Content Team

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