New Mexico Child Support Calculator
Uses NM Income Shares model — NMSA 40-4-11.1 combined gross income
Table of Contents
How New Mexico Calculates Child Support
New Mexico uses the Income Shares model under NMSA Section 40-4-11.1. The calculation considers both parents' gross income, subtracts allowable deductions to arrive at adjusted gross income, combines the adjusted incomes, and looks up the basic child support obligation from the guidelines schedule. Each parent's share is proportional to their contribution to the combined income.
New Mexico's guidelines are maintained by the Supreme Court and create a rebuttable presumption that the calculated amount is appropriate. The NM Human Services Department, Child Support Enforcement Division (CSED), administers the state's child support program and provides resources for establishing, modifying, and enforcing child support orders.
Income Under NMSA 40-4-11.1
New Mexico defines gross income broadly including wages, salaries, commissions, bonuses, self-employment income, rental income, interest, dividends, pensions, Social Security, unemployment, workers' compensation, alimony, trust income, and military pay. Allowable deductions include federal and state taxes, FICA, mandatory retirement, union dues, alimony paid, and prior child support obligations.
NM courts can impute income to parents who are voluntarily unemployed or underemployed. The court considers education, work experience, skills, and the local job market. Courts will not impute income to parents caring for children under age 6 in certain circumstances.
Shared Responsibility in New Mexico
New Mexico addresses shared responsibility (joint custody) when each parent has the children at least 35% of the time (approximately 128 days per year). In these cases, the guidelines provide an adjustment that accounts for the duplicated costs of maintaining two homes. Each parent's obligation is calculated separately, multiplied by an adjustment factor, and the obligations are offset. The parent with the higher adjusted obligation pays the difference.
Special Considerations
New Mexico has specific provisions for Native American tribal jurisdiction, as the state has 23 federally recognized tribes and pueblos. Child support cases involving tribal members may involve tribal court jurisdiction. NM also addresses military families, seasonal workers (particularly in agriculture and tourism), and self-employed individuals in the oil and gas industry. The state's unique demographic and economic characteristics influence how courts apply the guidelines in practice.
Modification and Enforcement
NM allows modification when applying current guidelines would change the support amount by 20% or more. Common grounds include income changes, custody changes, and changes in children's needs. Enforcement tools include income withholding, tax interception, license suspension, contempt, liens, bank levies, credit reporting, and passport denial. Child support in NM continues until the child turns 18, or 19 if still in high school.
NM combines both parents adjusted gross incomes and uses the guidelines schedule to determine the basic obligation
New Mexico Child Support Schedule
Below is a representative sample of the New Mexico child support schedule showing basic monthly obligations:
| Combined Monthly Income | 1 Child | 2 Children | 3 Children | 4 Children | 5 Children |
|---|---|---|---|---|---|
| $1,500 | $270 | $406 | $465 | $503 | $537 |
| $2,500 | $396 | $596 | $682 | $738 | $787 |
| $3,500 | $492 | $739 | $837 | $911 | $976 |
| $5,000 | $618 | $928 | $1,049 | $1,143 | $1,225 |
| $7,500 | $808 | $1,204 | $1,349 | $1,480 | $1,592 |
| $10,000 | $979 | $1,452 | $1,625 | $1,785 | $1,922 |
| $15,000 | $1,270 | $1,873 | $2,102 | $2,314 | $2,496 |
| $20,000 | $1,511 | $2,200 | $2,479 | $2,734 | $2,953 |
New Mexico Worksheet A vs. Worksheet B
New Mexico uses two different worksheets depending on the custody arrangement, similar to many Income Shares states but with New Mexico-specific thresholds and calculations.
Worksheet A — Sole or Primary Custody
Worksheet A is used when one parent has primary physical custody. The non-custodial parent's share of the basic child support obligation, plus their proportional share of additional expenses (health insurance, childcare, extraordinary medical/educational expenses), becomes the monthly support payment. This is the simpler and more commonly used worksheet.
Worksheet B — Shared Responsibility
Worksheet B applies when each parent has the child for a significant portion of the year. New Mexico uses shared responsibility calculations when the non-custodial parent has the child for at least 35% of overnights (approximately 128 nights per year). The Worksheet B calculation multiplies the basic obligation by 1.5 to account for duplicated household costs, then offsets each parent's proportional share.
Key Differences
| Factor | Worksheet A | Worksheet B |
|---|---|---|
| Custody type | Primary/sole | Shared (35%+ overnights) |
| Multiplier | None | 1.5x base obligation |
| Calculation | NCP pays proportional share | Offset between parents |
| Typical result | Higher payment | Reduced net payment |
Income Considered in New Mexico
New Mexico takes a broad view of income for child support purposes under NMSA 1978, Section 40-4-11.1.
Income Included
- Employment income: Wages, salaries, tips, commissions, bonuses, overtime
- Self-employment: Net business income after legitimate expenses
- Investments: Dividends, interest, capital gains, rental income
- Government benefits: Social Security, unemployment, workers' compensation, veterans' benefits
- Retirement: Pension payments, annuities, retirement distributions
- Other: Alimony received, trust income, prizes, in-kind compensation
Imputed Income
New Mexico courts can impute income to a parent who is voluntarily unemployed or underemployed. The court considers the parent's education, work history, health, age, criminal record, and the local job market. Income is imputed at the amount the parent could reasonably earn given their qualifications. This prevents parents from deliberately reducing income to lower support obligations.
When NM Courts Deviate from Guidelines
New Mexico courts may deviate from the calculated guideline amount when strict application would be unjust or inappropriate. Written findings are required explaining why deviation serves the child's best interests.
- Extraordinary medical expenses for children with special health needs
- Special educational expenses including private school or therapy
- Long-distance travel costs for parenting time between distant locations
- Combined income exceeding the schedule maximum
- Significant disparity in living standards between households
- Child's independent income or assets
- Tax consequences affecting either parent disproportionately
How to Modify Child Support in New Mexico
New Mexico allows modification when there has been a material and substantial change in circumstances. Common grounds include:
- Significant change in either parent's income (typically 20% or more)
- Change in custody or parenting time arrangements
- A child reaching emancipation age
- Change in health insurance costs or childcare expenses
- Relocation of either parent
File a motion to modify with the court that issued the original order. Provide updated financial disclosures and documentation of changed circumstances. Modifications are effective from the date of filing the motion.
Enforcement of NM Child Support
New Mexico enforces child support through the Human Services Department, Child Support Enforcement Division (CSED). Enforcement tools include:
- Income withholding — automatic for all orders
- Tax refund interception — federal and state
- License suspension — driver's, professional, recreational
- Contempt of court — fines and possible imprisonment
- Property liens — real estate and personal property
- Credit reporting — delinquencies reported to credit bureaus
- Passport denial — for arrearages over $2,500
NM child support continues until the child reaches age 18, or age 19 if still attending high school. Support may continue for disabled adult children unable to support themselves.