Coparent Math
$650.28a month, paid by the other parentDetails

Independent · free · no sign-up · rules checked 2 Nov 2026

Child support, with the working shown.

Your state's guideline amount, every step of its formula, and the law behind each step.

In Virginia, with child, the parent the children live with earns a month and the other parent earns , both before tax. Child care costs a month, paid by .

146 days

Virginia uses its shared custody formula when each parent has the children more than 90 days a year.

More details: health insurance, spousal support

The children's health insurance costs a month, paid by .

Spousal support between the parents is a month, paid by .

Every step of the formula: the arithmetic and the law behind each step

How Virginia gets to $650.28

Virginia's formula (income shares), written out with your numbers. Each step names the part of the law it comes from.

  1. Add the two incomesCode of Virginia § 20-108.2

    $4,000 + $6,000 = $10,000 a month. The other parent's share is $6,000 ÷ $10,000 = 60%.

    60%
  2. Look up the schedule§ 20-108.2 B, schedule of support

    The schedule's amount for $10,000 of combined income and 1 child.

    $1,251.00
  3. Work out the sole-custody figure§ 20-108.2 G, sole and shared custody

    ($1,251.00 + child care $500) × 60% = $1,050.60.

    $1,050.60
  4. Check for shared custody§ 20-108.2 G, sole and shared custody

    146 days with the other parent is more than 90, and so is the rest of the year with the parent the children live with, so shared custody applies. Shared need = $1,251.00 × 1.4 = $1,751.40. The other parent's custody share is 146 ÷ 365 = 40%.

    $1,751.40
  5. Work out the shared-custody figure§ 20-108.2 G, sole and shared custody

    The other parent: $1,751.40 × 60% income share × 60% of the year with the parent the children live with = $630.50, plus 60% of the costs the parent the children live with pays, $300.00, so $930.50. The parent the children live with: $1,751.40 × 40% income share × 40% of the year with the other parent = $280.22. Difference: $930.50 − $280.22 = $650.28, paid by the other parent.

    $650.28
  6. Take the lower of the two§ 20-108.2 G, sole and shared custody

    When the other parent pays, the lower of the sole and shared figures applies when a party shows it.

    Sole custody $1,050.60Shared custody $650.28, applies
    $650.28 a month

Notes

  • Half of any self-employment tax paid is also deducted from income (not modeled).
  • Reasonable and necessary unreimbursed medical and dental costs are shared in proportion to gross income as they are incurred, outside the monthly amount (§ 20-108.2 D, not modeled).
  • Deductions for other children are not modeled: support paid for other children under an order or written agreement, and the schedule amount for a parent's own children living with that parent (§ 20-108.2 C).
  • Disability benefits paid to the children from a parent's entitlement count as that parent's income and are credited against support (§ 20-108.2 C); not modeled.
  • Low income is not modeled beyond the minimum: when the paying parent's gross income is at or below 150% of the federal poverty level, a court may set less than the statutory minimum, and the minimum does not apply to some parents (for example those imprisoned for life or totally and permanently disabled) (§ 20-108.2 B). Shared custody support is not presumed correct when either parent's income is that low (G 3 (d)).
  • Days are counted as whole days; the half-day rule for an overnight of less than 24 hours (§ 20-108.2 G 3 (c)) is not modeled.
  • Split custody, different schedules for different children, and mixes of sole, split and shared custody (§ 20-108.2 G 2, 4 to 6) are not modeled.

Rules: Virginia guideline in force from 1 Jul 2025, checked 2 Nov 2026. Schedule imported from the statute page on 31 Oct 2026.

By the numbers

Independent, free, no sign-up. Counted from the rule files when this page was built.

3
states covered: Virginia, Texas and New York
16
guideline steps modeled, each with its statute section
21
official sources cited: statutes, state charts, federal tables
2 Nov 2026
when the rules were last checked against their sources

3 states, 3 formulas

Each state writes its guideline differently. Each figure below is the engine's result for that state's example family.

  • Virginia

    Income shares

    $650.28 a month, paid by the other parent

    For 1 child; the parent the children live with earns $4,000 a month and the other parent $6,000, before tax; 146 days a year with the other parent; child care of $500 a month, paid by the parent the children live with.

    Both incomes are added, a schedule sets what the children need, and each parent covers their share. Shared custody starts after 90 days a year with each parent.

    Virginia calculator
  • Texas

    Percentage of net resources

    $1,239.21 a month, paid by the other parent

    For 2 children; the other parent earns $6,000 a month before tax.

    A set percentage of the paying parent's income after tax: 25% for two children.

    Texas calculator
  • New York

    Combined income, up to a cap

    $3,012.50 a month, paid by the other parent

    For 2 children; the parent the children live with earns $8,000 a month and the other parent $12,000, before tax; child care of $1,000 a month, paid by the parent the children live with.

    A percentage of both incomes up to $193,000 a year, split by income share. Above the cap, the court decides.

    New York calculator

Why the numbers hold up

How child support is calculated here, in full.

  • Every step names its law

    Each step of the trace cites the part of the statute it comes from: Virginia's custody step cites § 20-108.2 G, sole and shared custody.

  • The arithmetic is written out

    The engine writes the worked steps as it computes, 16 steps across 3 states, so every amount can be checked by hand. The Texas tax figures match 340 of 342 rows of the Attorney General's charts to the cent.

  • Figures are dated

    Caps, reserves and minimums change on their own calendar, so each is a dated value (12 in the rule files). New York's combined parental income cap is $193,000 a year from 1 Mar 2026 to 29 Feb 2028.

  • What is not modeled is said

    Each calculator page lists the parts of the guideline the engine does not compute, and every figure not yet confirmed from a primary source is marked where it is used.

A family, in one sentence

In New York, with 2 children, the parent the children live with earns $8,000 a month and the other parent earns $12,000, both before tax. Child care costs $1,000 a month, paid by the parent the children live with.

The guideline: $3,012.50 a month, paid by the other parent.

See the 8 steps that get there

Questions

How accurate is the estimate?

It follows each state's guideline formula as written, step by step, and shows every step with the statute section it comes from. The Texas tax figures are tested against the Attorney General's charts: 340 of 342 rows match to the cent. A court can still order a different amount than the guideline.

What does the calculator take into account?

The number of children, and monthly income before tax: both parents' in Virginia and New York, the paying parent's only in Texas. Days with each parent in Virginia. Child care in Virginia and New York. Health insurance in Virginia, Texas and New York. Spousal support in Virginia. Union dues in Texas. Each calculator page lists what its formula does not model.

Is anything I type stored or sent?

No. The calculator runs in your browser and recalculates there, and the numbers never leave it. The site sets no cookies and loads nothing from other sites. Visits are counted with self-hosted statistics that store no IP address; using the calculator counts as one event with the state, never the numbers.

Which rules and dates does it use?

The rules in force on 2 Nov 2026, from each state's rule file. Figures that change on their own calendar are dated: New York's combined parental income cap is $193,000 a year from 1 Mar 2026 to 29 Feb 2028, and the calculator uses the value in force on the date.

What if part of my case is not covered?

Each calculator page lists the parts of its guideline the engine does not compute, and figures not yet confirmed from a primary source are marked wherever they are used (0 today). A court applies the parts that are not modeled; the estimate does not.

Does it favor either parent?

No. It speaks of the parent the children live with and the other parent, draws both in the same color, and says who pays from the formula's own result. In Virginia's shared custody formula that can be either parent.