New Mexico Child Support — Calculator, Laws & Guide (2026)

Understanding New Mexico child support laws helps both custodial and non-custodial parents know their rights and obligations. This comprehensive New Mexico child support guide covers how payments are calculated, what income counts, when support can be modified, and how orders are enforced. Whether you are going through a divorce, seeking a modification, or dealing with non-payment, this guide explains New Mexico’s child support system in plain language.

Verified against New Mexico statutes and federal OCSE guidelines as of April 2026.

New Mexico Child Support Overview

New Mexico uses the income shares model for calculating child support. This model is based on the principle that children should receive the same proportion of parental income they would have received if the family were intact. Both parents’ incomes are combined, and the support obligation is divided proportionally.

New Mexico uses the income shares model. Both parents’ gross incomes are combined and looked up in the Basic Child Support Schedule (updated effective January 1, 2024 under SB223) to determine the basic child support obligation based on the number of children. Each parent then pays their proportional share based on their percentage of the combined income. The schedule covers combined incomes up to 30000 per month. A 1200 per month self-support reserve applies to low-income paying parents whose incomes are just above the poverty line. The minimum order is 60 per month plus 15 for each additional child. Worksheet A is used for basic visitation (noncustodial parent has child less than 35% of overnights), and Worksheet B is used for shared responsibility (35% or more overnights).

How New Mexico Calculates Child Support

The New Mexico child support calculation considers multiple factors:

1. Determine each parent’s gross income — wages, salary, commissions, bonuses, self-employment income, investment income, and other sources.
2. Calculate combined parental income — add both parents’ adjusted gross incomes together.
3. Apply the guideline schedule — New Mexico’s guidelines provide a base support amount based on combined income and number of children.
4. Prorate between parents — each parent’s share is proportional to their percentage of the combined income.
5. Add healthcare and childcare costs — these are added to the base amount and divided proportionally.
6. Apply adjustments — parenting time credits, other child obligations, and special circumstances may adjust the final amount.

Online calculator: Use our child support estimator below to calculate your estimated obligation.

What Counts as Income in New Mexico

Gross income — includes all income of a parent except TANF, food stamps, and Supplemental Security Income (SSI). If income is steady, current income is used. If income varies significantly month to month, the court uses an average of the last twelve months or last year’s income tax return. Allowed deductions from gross income include federal and state taxes, FICA, union dues, cost of health/dental insurance for the child, and support obligations for other children actually being paid.

Imputed income: YES. If a court finds that a parent has willfully failed to obtain or maintain appropriate employment or is willfully underemployed, the court may impute income equal to that parent’s earning and employment potential. Exceptions: income may NOT be imputed to a parent incarcerated for 180 days or longer (incarceration is not considered voluntary unemployment), and income need not be imputed to the primary custodial parent actively caring for a child of the parties who is under the age of six or is disabled. Under the 2024 updated rules, labor market data must be considered when imputing income — for example, the New Mexico average for low-wage jobs is 34.1 hours per week, so imputing at 40 hours would be inappropriate in those instances.

Deviation factors: The court may deviate upward or downward from the guideline amount if applying the guidelines would be unjust or inappropriate. Specific factors include: (1) substantial hardship in the obligor, obligee, or subject children; (2) whenever a parent is required to pay more than 40% of gross income for a single child support obligation, there is a rebuttable presumption of substantial hardship; (3) the child’s own income; (4) extraordinary medical expenses or special needs of the child; (5) extraordinary educational expenses; (6) the standard of living the child would have enjoyed had the family remained intact. Any deviation must be supported by written findings stating the guideline amount and the justification for the variance.

Healthcare & Childcare in New Mexico Child Support

Health insurance: Both parents are required to contribute to the children’s health and dental insurance premiums, which are included as a line item in the child support worksheet. The cost is divided proportionally based on each parent’s share of combined income. Parents must also split uncovered necessary healthcare expenses (copays, deductibles, uninsured medical costs) in proportion to their incomes. Under the 2024 updated rules, the previous practice of ordering 5 per month in cash medical support when the child has public health coverage (such as Medicaid) has been officially discontinued.

Childcare costs: Work-related childcare costs are included in the child support worksheet as an add-on to the basic support obligation. Each parent’s childcare costs are entered in their respective column. If childcare costs vary (for example, between the school year and summer), the total yearly cost is divided by twelve to determine a monthly average. The combined childcare cost is then allocated between the parents proportionally based on their share of combined income.

When Does New Mexico Child Support End?

In New Mexico, child support generally ends when the child reaches 18. If the child is still enrolled in and attending high school at age 18, support continues until the child graduates from high school or turns 19, whichever occurs first. Support may also end earlier if the child is emancipated (available to minors age 16 and older), marries, enters active military duty, or is otherwise legally emancipated. Support may extend beyond 18 for a disabled child who cannot support themselves.. However, support may continue or end earlier based on:

• The child graduates from high school (if still a minor)
• The child becomes emancipated (marriage, military service, self-supporting)
• The child has special needs requiring ongoing support
• College support: NO. New Mexico courts cannot order a parent to pay for post-secondary education expenses. However, parents may voluntarily agree in writing to contribute to college costs, and such agreements are contractually enforceable by the court. During minority, extraordinary educational expenses (such as private school) may be included in the child support calculation.

Modifying New Mexico Child Support

When to modify: A modification requires a material and substantial change in circumstances. The primary threshold is a change of more than 20% in the calculated child support obligation (either upward or downward) AND more than one year must have passed since the previous child support order was entered. Other qualifying changes include job loss, significant income increase, change in custody or timesharing arrangements, change in the child’s needs, or a change in the number of dependents.

How to modify: Either parent can request a modification through the Child Support Services Division (CSSD) of the New Mexico Health Care Authority, which will conduct a review and adjustment. Alternatively, a parent can file a motion to modify child support directly with the district court that issued the original order. The CSSD review is available for IV-D cases (cases where the state agency is involved in enforcement). For non-IV-D cases, the parent must petition the court directly. Contact CSSD at 1-800-283-4465 or apply online at https://yes.nm.gov

Either parent can request a modification. Changes are typically not retroactive to before the date of filing the modification request.

New Mexico Child Support Enforcement

New Mexico has multiple tools to enforce child support orders when a parent fails to pay:

• Immediate income/wage withholding (mandatory for all orders unless both parties and the court agree otherwise); federal and state income tax refund intercepts; driver’s license suspension; professional license suspension; game and fish (hunting/fishing) license suspension; United States passport denial (for arrears exceeding 2500); liens against real and personal property; financial account/bank account seizure; garnishment of assets; civil contempt proceedings; bench warrants; credit bureau reporting. If administrative remedies fail
• CSSD may refer the case to court for additional enforcement action.

Contact Child Support Services Division (CSSD), formerly known as the Child Support Enforcement Division (CSED), within the New Mexico Health Care Authority (HCA) at https://www.hca.nm.gov/lookingforassistance/child_support/ for enforcement assistance.

Additional New Mexico rules: (1) Self-support reserve: A 1200 per month self-support reserve was added effective January 1, 2024, protecting low-income obligors whose incomes are just above the poverty line from support obligations that would push them below subsistence. (2) 40% hardship cap: When guideline support exceeds 40% of the paying parent’s gross income for a single obligation, a rebuttable presumption of substantial hardship applies. (3) Incarceration rule: A parent incarcerated for 180 days or more cannot have income imputed to them; incarceration is explicitly not treated as voluntary unemployment. (4) Two worksheet system: Worksheet A applies when the noncustodial parent has fewer than 35% of overnights; Worksheet B applies for shared responsibility at 35% or more overnights, which adjusts the calculation to reflect both parents’ direct expenditures on the child. (5) Labor market data: The 2024 guidelines require consideration of labor market data when imputing income, recognizing that many low-wage jobs in New Mexico average 34.1 hours per week rather than 40. (6) Online case portal: Parents can manage their child support cases online at https://yes.nm.gov

Official Sources & Resources

• Child Support Services Division (CSSD), formerly known as the Child Support Enforcement Division (CSED), within the New Mexico Health Care Authority (HCA): https://www.hca.nm.gov/lookingforassistance/child_support/
• Federal OCSE: acf.hhs.gov/css
• Cornell LII — Child Support: law.cornell.edu
• New Mexico Guidelines Statute: NMSA 1978, Section 40-4-11.1 (Child Support Guidelines and Basic Child Support Schedule); NMSA 1978, Section 40-4-11.2 (Grounds for Deviation from Child Support Guidelines); NMSA 1978, Section 40-4-11 (Determination of Award of Child Support; Notice to Withhold Income); New Mexico Administrative Code 8.50.108 (Establishment and Modification of Support Orders)

Last verified April 2026. Contact us if you notice outdated information.

Estimate Your Child Support

Use our free child support estimator to calculate estimated monthly payments. Enter both parents’ incomes, number of children, and custody arrangement to see a personalized breakdown based on your state’s formula.

Related Guides

• New Mexico Divorce Process Guide
• New Mexico Child Custody Guide
• New Mexico Alimony Guide
• All Child Support Guides