How Child Support Is Calculated in New York

If you’re separating or divorcing in New York, you’ll quickly hear about the Child Support Standards Act (CSSA)—the law that guides how basic child support is calculated. While every family is unique, New York uses a consistent formula so parents can plan realistically and courts can apply the law fairly. Below is a plain-English walkthrough of what goes into a support order, what’s in the calculation (and what’s not), and how courts handle special situations.

The Big Picture: New York’s Formula

New York starts by looking at both parents’ combined parental income and the number of children who need support. The law then applies a fixed percentage to that combined income to determine the basic child support obligation:

• 1 child: 17%
• 2 children: 25%
• 3 children: 29%
• 4 children: 31%
• 5+ children: at least 35%

These percentages come straight from the CSSA, which New York courts and agencies use every day. 

Step 1: Determine Each Parent’s “CSSA Income”

“Income” for child support isn’t just your take-home pay. The court starts with your gross income (as reported to the IRS) and then makes adjustments—typically subtracting items like FICA/Social Security/Medicare, NYC or Yonkers local tax, and certain support paid for other children. Statutes and court materials lay out this definition in detail. 

Why it matters: Getting income right is the foundation of a fair order. Courts may also impute income (i.e., assume you could earn more) if they find underreporting or intentional unemployment.

Step 2: Apply the Income Cap

New York applies the CSSA percentages to combined income up to a statutory cap, which is updated every two years. For March 1, 2024 through February 28, 2026, the cap is $183,000. Above that number, a judge may apply the percentages to some or all income over the cap based on statutory factors (see “Deviations & Discretion,” below). 

Step 3: Calculate the Basic Child Support & Split It Pro Rata

Once the court has:

1. each parent’s CSSA income, and
2. the combined income (subject to the cap),

it multiplies the combined income by the percentage for your number of children to get the basic child support obligation. That total is then divided pro rata (proportionally) between the parents based on their share of the combined income. 

What Basic Child Support Covers (and What It Doesn’t)

Basic child support is meant to cover food, clothing, and shelter—the day-to-day essentials. Certain additional expenses are usually handled on top of basic support as “add-ons,” typically split pro rata between the parents:

• Child care needed for a parent to work or attend school/training
• Health insurance premiums for the child and unreimbursed medical/health expenses
• Other court-approved expenses (e.g., educational or extraordinary costs)

These add-ons and the pro-rata approach are spelled out in New York’s Domestic Relations Law. 

A Quick (Simplified) Example

• Parent A CSSA income after FICA deductions: $80,000
• Parent B CSSA income after FICA deductions: $40,000
• Combined income: $120,000
• One child → 17% of $120,000 = $20,400 basic annual support
• Parent A earns 2/3 of the combined income; Parent B earns 1/3.
  • Parent A’s pro-rata share ≈ $13,600/year
  • Parent B’s pro-rata share ≈ $6,800/year

If Parent B is the custodial parent, Parent A would generally pay $13,600/year (about $1,133/month) as basic support, plus their pro-rata share of add-on expenses like childcare or unreimbursed medical (if ordered).

Note: This is an illustration only. Actual orders depend on verified income, caps, adjustments, and any deviations the court finds appropriate.

Low-Income Protections: The Self-Support Reserve

Courts must ensure a support order doesn’t push a payor below New York’s Self-Support Reserve (SSR) (a benchmark tied to the federal poverty level). As of March 1, 2025, the SSR is $21,128. If the calculation would drop the payor below the SSR, the court must adjust—often resulting in a reduced or nominal order. 

How Long Does Child Support Last in NY?

In New York, the duty to support generally continues until the child turns 21, unless the child is emancipated earlier (e.g., marriage, military service, or other court-recognized circumstances). 

Deviations & Judicial Discretion (When the Guideline Isn’t Fair)

The CSSA formula creates a presumptively correct number, but courts can deviate if applying the guideline would be unjust or inappropriate. Judges consider factors like:

• The child’s needs and standard of living
• Tax impacts
• The noncustodial parent’s ability to pay
• Extraordinary expenses (educational, special needs, etc.)
• The parents’ resources and any unequal distribution of assets

These discretion points come from DRL §240(1-b) and related guidance used by New York courts. 

Common Questions

Do bonuses/commissions count? Usually yes—if they’re a regular part of income, they’re typically included or averaged. (Courts can also consider historic earning patterns.) 

Who pays for health insurance for the child? The court will order coverage to be maintained if available at a reasonable cost, and split the premium pro rata between the parents (by adding or crediting the appropriate share to the obligation). Unreimbursed medical expenses are also pro rata. 

What about child care so I can work or go to school? Reasonable work- or education-related child care is a mandatory add-on split pro rata. 

Is there a tool I can use to estimate? Yes—NY courts publish worksheets and there are reputable calculators that follow the CSSA framework. Keep in mind these tools don’t replace legal advice. 

Official References & Current Numbers

• CSSA Percentages & Annual Chart (updated March 2025). 
• Income Cap ($183,000 through Feb. 2026). 
• Self-Support Reserve ($21,128 starting March 1, 2025). 
• Statutory Bases & Court Guidance (DRL §240; FCA §413; NY Courts FAQs). 

Bottom Line

New York child support is formula-driven—but there’s still room for strategy in how income is presented, how add-ons are handled, and whether a deviation is warranted. Getting experienced, local guidance can make a real difference in the outcome.

Talk to a Local Long Island Child Support Attorney

At The Law Offices of Ian S. Mednick, P.C., we help parents across Suffolk and Nassau County understand their rights, calculate accurate support, and advocate for fair, sustainable orders—whether you’re seeking support or responding to a request.

Call (631) 787-8322 or schedule a confidential consultation today. We’ll walk you through your numbers, your options, and the best next steps for your family.