Modifying New Mexico Spousal Support and the 20-Year Rule
In New Mexico, rehabilitative, transitional and indefinite spousal support can be modified whenever circumstances render a change proper unless made nonmodifiable, and the court retains jurisdiction over periodic support after a marriage of 20 years or more.
Modifying support
The court may modify and change spousal support awarded as rehabilitative, transitional or indefinite support whenever the circumstances render the change proper; it may instead designate rehabilitative or transitional support as nonmodifiable as to amount or duration (NMSA 40-4-7(B)(2)). A lump sum in definite installments is not modifiable in this way.
The 20-year rule
The court shall retain jurisdiction over proceedings involving periodic spousal support when the parties have been married 20 years or more before the dissolution, unless the order or decree specifically provides that no spousal support shall be awarded (subsection F).
Indefinite support
Support for an indefinite duration has no end date, but it can be modified when circumstances change and ends on the receiving spouse’s death unless the order provides otherwise.
Transitional support
The period must be clearly stated in the final order, so the end date is known from the start.
Evidence to gather
The decree, proof of the change in circumstances with dates and any agreement about modification.
Questions for the negotiation
Decide whether the agreement should make support nonmodifiable or set an end date.
Next steps
See the types and factors and test a ceiling in the New Mexico alimony calculator.
Frequently asked questions
Can New Mexico spousal support be modified?
Yes, rehabilitative, transitional and indefinite support, whenever circumstances render a change proper, unless it was designated nonmodifiable.
Can New Mexico make spousal support nonmodifiable?
Yes, for rehabilitative and transitional support, as to amount or duration.
What is the New Mexico 20-year rule?
The court retains jurisdiction over periodic support after a marriage of 20 years or more, unless the decree says no support is awarded.
Can a New Mexico lump sum be changed?
Not by modification; it is a definite sum in one or more installments.
How long does transitional support last in New Mexico?
For the limited period stated in the final order.
Official sources
- NMSA 40-4-7: proceedings, spousal support and division of property
- Bustos v. Bustos, 1983-NMSC-074: alimony within the court’s discretion
A local family law attorney can review your situation — many offer a free consultation.
This is general information, not legal advice. It is based on the cited New Mexico statutes, rules and court opinions, and every case turns on its own facts. Confirm how the law applies to your situation with a licensed New Mexico attorney.