New Mexico calculates child support using the income shares model under NMSA § 40-4-11.1, which combines both parents gross monthly incomes and allocates the child support obligation proportionally based on each parents percentage of that combined income. The states Basic Child Support Schedule, updated effective January 1, 2024 through SB223, covers combined parental incomes up to $30,000 per month and includes a $1,200 monthly self-support reserve to protect low-income paying parents from falling below poverty level. For one child with parents earning a combined $5,000 monthly, the base child support obligation is approximately $830, while two children at the same income level generate an obligation of roughly $1,233 per month before adjustments for healthcare and childcare costs.
Key Facts About New Mexico Child Support
| Factor | Details |
|---|---|
| Calculation Model | Income Shares Model |
| Governing Statute | NMSA § 40-4-11.1 |
| Maximum Combined Income Covered | $30,000/month |
| Self-Support Reserve | $1,200/month (effective Jan 1, 2024) |
| Worksheet A Threshold | Less than 35% parenting time |
| Worksheet B Threshold | 35% or more parenting time |
| Support Duration | Until age 18 (or 19 if still in high school) |
| Modification Standard | Material and substantial change in circumstances |
| Divorce Filing Fee | $137 statewide (as of March 2026) |
| Residency Requirement | 6 months domicile in New Mexico |
How New Mexico Calculates Child Support Using the Income Shares Model
New Mexico courts determine child support by first combining both parents adjusted gross monthly incomes, then locating the corresponding basic child support obligation on the states schedule, and finally dividing that obligation proportionally based on each parents share of the combined income. Under NMSA § 40-4-11.1, gross income includes wages, salaries, bonuses, commissions, self-employment earnings, rental income, investment returns, Social Security benefits, unemployment compensation, workers compensation, and alimony received from other relationships. The income shares model reflects the principle that children should receive the same proportion of parental income they would have received if the parents lived together.
The calculation process follows five specific steps. First, each parent determines their gross monthly income from all sources. Second, allowable deductions are subtracted, including federal and state taxes, FICA contributions, mandatory retirement contributions, union dues, and any child support paid for children from other relationships. Third, the parents adjusted gross incomes are combined. Fourth, the basic child support obligation is found on the schedule corresponding to that combined income and number of children. Fifth, each parents share is calculated by multiplying the basic obligation by their percentage of the combined income.
Understanding New Mexicos Two Child Support Worksheets
New Mexico employs two distinct worksheets for calculating child support depending on how parenting time is divided between the parents. Worksheet A applies when the noncustodial parent has the child for less than 35% of overnight time annually, which equates to fewer than 128 overnights per year. Worksheet B applies to shared responsibility arrangements where each parent has at least 35% of overnights, recognizing that both parents incur significant direct expenses for the child when custody is more equally divided.
The difference between these worksheets significantly impacts the final child support amount. Under Worksheet B for shared responsibility cases, the basic child support obligation from the schedule is multiplied by 1.5 before being divided proportionally between the parents. This 50% increase accounts for the reality that shared custody creates duplicate expenses, as each household must maintain bedrooms, clothing, food, and supplies for the children. The paying parent then receives credit for time spent with the child, which can substantially reduce the net child support transfer between households.
The 2024 Updated Basic Child Support Schedule
New Mexicos Basic Child Support Schedule was modernized effective January 1, 2024 under Senate Bill 223, representing the first major update to the guidelines in over a decade. The revised schedule covers combined parental incomes up to $30,000 per month, an increase from the previous $20,000 cap, and incorporates updated economic data reflecting current costs of raising children. These changes affect all new child support orders and modifications filed after January 1, 2024, though existing orders remain unchanged unless a party petitions for modification.
The following table shows sample basic child support obligations from the 2024 schedule based on combined parental income:
| Combined Monthly Income | 1 Child | 2 Children | 3 Children |
|---|---|---|---|
| $2,000 | $365 | $496 | $565 |
| $3,000 | $524 | $712 | $812 |
| $4,000 | $673 | $916 | $1,046 |
| $5,000 | $830 | $1,233 | $1,271 |
| $6,000 | $905 | $1,233 | $1,409 |
| $8,000 | $1,058 | $1,442 | $1,646 |
| $10,000 | $1,207 | $1,645 | $1,879 |
| $15,000 | $1,566 | $2,136 | $2,441 |
| $20,000 | $1,862 | $2,541 | $2,905 |
The $1,200 Self-Support Reserve for Low-Income Parents
One of the most significant changes in the 2024 guidelines is the introduction of a $1,200 monthly self-support reserve that protects low-income paying parents from having their income reduced below subsistence level. This reserve ensures that the obligor parent retains at least $1,200 per month after the child support obligation is deducted, which is slightly above 100% of the federal poverty guideline for a single person. The self-support reserve applies only to Worksheet A calculations and does not apply to shared responsibility arrangements under Worksheet B.
The practical effect of this reserve is reduced child support obligations for parents earning near the poverty line. Previously, a parent earning $1,800 per month might have been ordered to pay $400 or more in child support, potentially leaving them unable to cover basic living expenses. Under the new guidelines, that same parent would have their obligation capped to ensure they retain at least $1,200 after payment. This change reflects modern understanding that impoverishing the paying parent ultimately harms children by creating instability and increasing the likelihood of payment defaults.
Additional Expenses Beyond Basic Child Support
New Mexico law requires both parents to contribute proportionally to certain child-related expenses beyond the basic child support obligation. Under NMSA § 40-4-11.1, these additional expenses include the cost of providing medical and dental insurance for the child and work-related childcare expenses. Each parents share of these costs is calculated using the same income percentages used for the basic obligation, ensuring proportional contribution based on ability to pay.
Healthcare costs encompass monthly insurance premiums attributable to the children, as well as reasonable uninsured medical, dental, and vision expenses. Childcare expenses include daycare, after-school programs, and summer camps necessary for a parent to work or attend school. For example, if the custodial parent earns 40% of the combined income and the noncustodial parent earns 60%, and monthly childcare costs $800, the noncustodial parent would be responsible for $480 of that expense in addition to their basic child support obligation.
When Courts May Impute Income to Unemployed or Underemployed Parents
New Mexico courts have authority under NMSA § 40-4-11.1(D) to impute income to a parent who is voluntarily unemployed or underemployed, meaning the court assigns an earning capacity rather than using actual income when calculating child support. Before imputing income, the court must find that the parent willfully failed to obtain or maintain appropriate employment or deliberately took a lower-paying position to reduce support obligations. Courts consider the parents work history, education, vocational training, available jobs in the local market, and physical and mental capacity to work.
Several important exceptions limit when income may be imputed. Income cannot be imputed to a parent who is incarcerated for 180 days or longer, as incarceration is not considered voluntary unemployment under New Mexico law. Courts also recognize valid reasons for reduced employment, including caring full-time for a child under age six or a child with disabilities. Additionally, New Mexico appellate courts have held that a parent is not underemployed simply because they could earn more money in a different state where the child does not reside. When imputing income, courts may use minimum wage as the baseline if the parent has no recent employment history but has the capacity to work.
How Long Child Support Lasts in New Mexico
Child support in New Mexico continues until the child reaches age 18, or until age 19 if the child is still enrolled in and attending high school, as specified in NMSA § 40-4-7(b)(3)(b). Support may also terminate earlier if the child becomes emancipated through marriage, military service, or court order. For children with physical or mental disabilities that prevent self-sufficiency, support may continue indefinitely, requiring ongoing payments throughout the childs lifetime.
New Mexico does not have a statutory provision for child support to continue through college for adult children. Unlike some states that allow courts to order parents to contribute to post-secondary education expenses, New Mexico courts lack authority to extend support past the age of majority solely for college attendance. Parents who wish to share college costs must negotiate that arrangement privately, though any such agreement would be enforceable as a contract rather than a child support order.
Modifying Child Support Orders in New Mexico
Either parent may petition to modify an existing child support order by demonstrating a material and substantial change in circumstances under NMSA § 40-4-11.5. Qualifying changes include significant increases or decreases in either parents income, job loss, changed medical expenses, altered custody arrangements, or additional children from other relationships. The New Mexico Child Support Services Division may also conduct periodic reviews of orders and initiate modification proceedings when appropriate.
The modification process requires filing a motion with the court that issued the original order, along with current financial documentation from both parents. Courts recalculate support using the same worksheet methodology applied to new cases, applying any updates to the Basic Child Support Schedule that have occurred since the original order. Importantly, modifications take effect from the date of filing, not retroactively, so parents experiencing changed circumstances should file promptly rather than allowing arrearages to accumulate under the old order.
Child Support Enforcement Tools in New Mexico
The New Mexico Child Support Services Division, formerly known as the Child Support Enforcement Division, employs numerous mechanisms to collect unpaid child support. Wage garnishment is the most common enforcement tool, with employers required by law to withhold court-ordered amounts directly from the paying parents paycheck. The maximum garnishment can reach 50-65% of disposable income depending on circumstances and the amount of arrearages owed.
Beyond wage garnishment, the division has authority to intercept federal and state tax refunds, place liens on real property and personal assets, suspend drivers licenses and professional licenses, deny passport applications for those owing more than $2,500, report delinquencies to credit bureaus affecting the parents credit score, and in serious cases, pursue contempt of court charges that can result in fines or incarceration. These enforcement mechanisms ensure that child support obligations are treated with the same seriousness as other legal debts, with significant consequences for willful non-payment.
Filing for Child Support in New Mexico
To establish a child support order in New Mexico, at least one party must have been domiciled in the state for a minimum of six months immediately preceding the filing date, as required by NMSA § 40-4-5. The divorce filing fee is $137 statewide across all 13 judicial districts as of March 2026, with additional costs for service of process ranging from $25 to $50 unless the other party waives service. Fee waivers are available for those with household income below 200% of the federal poverty level by filing Forms 4-222 and 4-223.
Child support can be established as part of a divorce proceeding or through a separate paternity and support action if the parents were never married. In either case, both parties must complete and exchange financial disclosure forms documenting all income sources, and the court will apply the guidelines worksheets to calculate the presumptive support amount. Either party may present evidence for deviation from the guidelines if special circumstances make the calculated amount unjust or inappropriate.
Frequently Asked Questions About New Mexico Child Support
How much is child support in New Mexico for one child?
Child support for one child in New Mexico depends on both parents combined gross monthly income under the income shares model. At $5,000 combined monthly income, the basic obligation for one child is approximately $830 per month before adjustments for healthcare and childcare. At $10,000 combined income, the obligation rises to approximately $1,207 monthly. The paying parents actual share depends on their percentage of the combined income.
Can child support be reduced if I lose my job in New Mexico?
Yes, job loss constitutes a material and substantial change in circumstances that may justify a child support modification under NMSA § 40-4-11.5. You must file a motion to modify promptly, as changes only take effect from the filing date, not retroactively. Courts may impute minimum wage income if the unemployment appears voluntary, but involuntary job loss typically results in recalculated support based on actual current income or unemployment benefits received.
What percentage of income is child support in New Mexico?
New Mexico does not use a simple percentage formula but rather the income shares model that considers both parents incomes and the number of children. The basic obligation represents approximately 16-20% of combined parental income for one child, increasing with additional children. Each parents individual share is proportional to their contribution to the combined income, so a parent earning 60% of combined income pays 60% of the basic obligation.
Does New Mexico child support include college expenses?
No, New Mexico courts cannot order child support to continue through college for adult children. Support terminates at age 18, or age 19 if the child is still in high school. Parents who wish to contribute to college costs must negotiate that arrangement privately through a separate agreement. Any such agreement would be enforceable as a contract but not as a child support order subject to enforcement through the Child Support Services Division.
How does shared custody affect child support in New Mexico?
When each parent has the child for at least 35% of overnights annually (approximately 128 nights), New Mexico uses Worksheet B for shared responsibility arrangements instead of Worksheet A. Under Worksheet B, the basic child support obligation is multiplied by 1.5 to account for duplicate household expenses, then divided proportionally between parents. The paying parent receives credit for their parenting time, often significantly reducing the net transfer amount.
Can a new spouses income affect my child support in New Mexico?
No, under New Mexico law, a subsequent spouses income cannot be counted as an increase in the remarried parents income for child support calculation purposes. Only the biological or legal parents incomes are considered when applying the guidelines. However, a new spouses income might indirectly affect support if it allows the parent to reduce work hours voluntarily, which could trigger imputation of income at previous earning levels.
What happens if my ex refuses to pay child support in New Mexico?
The New Mexico Child Support Services Division has extensive enforcement powers for unpaid support, including wage garnishment up to 65% of disposable income, tax refund interception, property liens, license suspensions, passport denial, and credit reporting. For willful refusal to pay, courts may hold the parent in contempt, resulting in fines or jail time. Parents receiving public assistance automatically receive enforcement services, while others can apply for services through CSSD.
How often can child support be modified in New Mexico?
New Mexico law does not impose a specific waiting period between modification requests, but each petition must demonstrate a material and substantial change in circumstances. The Child Support Services Division typically reviews orders every three years if either party requests review, or sooner if significant changes occur. Courts may dismiss modification requests that lack evidence of genuine changed circumstances, so frivolous or repeated filings are discouraged.
Is child support taxable income in New Mexico?
No, child support payments are not taxable income to the receiving parent and are not tax-deductible for the paying parent under both federal and New Mexico tax law. This treatment differs from spousal support, which may be taxable depending on when the divorce was finalized. The tax-neutral status of child support means the full payment amount goes toward the childs needs without reduction for taxes.
What is the self-support reserve in New Mexico child support?
The self-support reserve is a $1,200 monthly threshold introduced in the January 2024 guideline updates that protects low-income paying parents from falling below poverty level. When calculating child support under Worksheet A, the reserve ensures the obligor retains at least $1,200 per month after payment. This provision primarily benefits parents earning between $1,200 and approximately $2,500 monthly by capping their obligations to maintain minimum subsistence.