To fill out a child support worksheet correctly, start with the current form your state publishes, report each parent’s gross income with paperwork to back it up, enter child-related expenses and the custody schedule as they actually are, and let the state’s formula produce the support amount. Federal law requires every state to publish guidelines and a worksheet that applies those guidelines to a family’s finances, and the number the worksheet generates is treated as presumptively correct.1Office of the Law Revision Counsel. 42 USC 667 – State Guidelines for Child Support Awards Mistakes on the worksheet can produce an order that’s too high, too low, or open to challenge later, so accuracy on each line matters more than speed.
Start With the Right Worksheet
Before entering a single number, confirm you have the correct form. Each state publishes its own worksheet tied to the calculation model it follows, and using the wrong one guarantees a do-over. About 41 states use the income shares model, which bases the support amount on both parents’ combined income. Roughly six states use the percentage of income model, which looks only at the noncustodial parent’s earnings and applies a set percentage.2Administration for Children and Families. How Is the Amount of My Child Support Order Set? A few states use a hybrid approach that builds in a self-support reserve before running the formula.
Family structure changes which worksheet applies. If you have children with more than one partner, some states provide a separate worksheet or a credit calculation for pre-existing support obligations. States with shared-custody formulas often use a different worksheet once the noncustodial parent’s overnights cross a threshold. Download the current version from your state court’s family law forms page along with the instructions. Many states also offer free online calculators that mirror the official formula, which is useful for checking your math before filing. Using last year’s form with last year’s schedule tables can produce a materially different result, so verify the version date.
Reporting Income
Income is the single biggest driver of the support calculation, and courts define it broadly. Income generally includes wages, salaries, bonuses, commissions, self-employment earnings, rental income, dividends, interest, retirement benefits, and government benefits like unemployment or disability payments. If money reaches you on a regular or recurring basis, it almost certainly counts.
Courts expect documentation behind every number you enter. Plan to attach your most recent tax returns (typically two years) and current pay stubs at minimum. If you receive income that doesn’t appear on those documents, such as rental payments or cash-based freelance work, bring bank statements or other records. Judges are skeptical of round numbers with nothing to support them, and the other parent’s attorney will look for gaps.
Pay attention to whether the worksheet asks for monthly or annual income. Entering an annual figure where a monthly one belongs throws the entire calculation off by a factor of twelve. States also vary on which deductions come off gross income before the formula runs. Some allow deductions for taxes and mandatory retirement contributions; others don’t. Applying deductions your state doesn’t recognize will get your worksheet kicked back.
Self-Employment and Irregular Income
Self-employed parents and those with commission-based or seasonal income face extra scrutiny. The worksheet asks for monthly gross income, but actual earnings may swing hard from month to month. Courts handle this by averaging income over a longer period, often two or three years of tax returns, to smooth out peaks and valleys and arrive at a representative monthly figure.
One trap catches self-employed parents often: the business deductions the IRS allows on a tax return are not necessarily the same deductions a family court will accept. Courts look at “ordinary and necessary” business expenses, but they tend to add back deductions that reduce taxable income on paper without actually reducing the cash available to support a child. Depreciation is a common example. If you claimed large business deductions, expect the other parent or the court to question whether those expenses genuinely reduced your ability to pay support.
Imputed Income
If a parent is voluntarily unemployed or deliberately working below their earning capacity, the court can assign them an income figure based on what they could be earning. Courts look at education, work history, professional licenses, physical ability, and local job market conditions when setting imputed income. The parent claiming underemployment typically needs to present evidence, such as job postings, the other parent’s resume, or records of recent voluntary separation from employment.
Courts in many states will not impute income to a parent who stays home to care for a very young child (often under age two) or a child with significant special needs. If that applies to you, be prepared to explain why staying home serves the child’s best interests.
Entering Child-Related Expenses
Most worksheets have separate lines for specific child-related costs beyond the base support amount the formula generates. These expenses get added to the base obligation and divided between the parents, usually in proportion to income. Unsupported numbers get struck, and once the order is entered, adding forgotten expenses requires a formal modification. Enter zero rather than leaving a line blank when a category doesn’t apply to you. A blank line looks like you forgot to answer; a zero shows the court you considered the category.
Healthcare
The worksheet will ask which parent provides health insurance for the child, what the premium costs, and whether either parent pays out-of-pocket medical, dental, or vision expenses. Many states require the parent with access to affordable employer-sponsored coverage to carry the child, and the cost of the child’s share of the premium factors into the calculation. Unreimbursed expenses like copays, deductibles, and treatment not covered by insurance are typically split between parents in proportion to their incomes. Some states require the custodial parent to cover a small initial threshold of unreimbursed costs each year before the other parent’s share kicks in. Bring insurance policy summaries and recent medical bills to document these figures.
Childcare
Work-related childcare is one of the largest add-on expenses. Daycare, before- and after-school programs, and summer care all count if the expense is necessary because a parent is working or attending school. Enter the actual cost you’re paying, and attach the provider’s contract or recent invoices.
Education and Extracurriculars
Private school tuition generally counts only if the child was already enrolled before the parents separated or if both parents agree to it. Beyond tuition, worksheets often have a line for school supplies, tutoring, and extracurricular activities. Some states cap what qualifies as a reasonable extracurricular expense, so check your state’s guidelines before adding every camp and lesson. Receipts and enrollment records support these entries.
Extraordinary Expenses
A child with a chronic medical condition, a disability requiring specialized equipment, or therapeutic needs that go beyond routine healthcare may generate costs the standard formula wasn’t designed to cover. Courts can add these to the base obligation if you provide medical records, treatment plans, and invoices showing the amounts. Some states also allow adjustments for significant travel expenses when parents live far apart and visitation involves airfare or long drives.
Entering the Custody Schedule
How much time the child spends with each parent directly affects the calculation in most states. A parent who has the child more nights incurs more direct costs for housing, food, and daily needs, so the formula adjusts.
States that use an overnight-based adjustment typically set a threshold, often around 30 to 40 percent of annual overnights, that triggers a shift from the standard formula to a shared-custody formula. Once the noncustodial parent crosses that line, their support obligation decreases to reflect the costs they’re already covering during parenting time. The exact threshold and the size of the adjustment vary by state, so enter the schedule accurately. A parenting plan or court order specifying overnights is the best documentation. If the schedule is informal, write it out in detail: vague entries like “every other weekend” can produce different overnight counts depending on how holidays and summers are handled.
High-Income and Low-Income Situations
Many state guidelines cap out at a certain combined income level. Above that cap, the court has discretion to determine what the child reasonably needs rather than mechanically applying the formula. At the bottom end, most guidelines include a self-support reserve, an income floor below which the paying parent’s obligation is reduced or eliminated so they can meet their own basic needs. If your income falls near either extreme, the standard worksheet lines may not tell the whole story, and you may need to attach a written explanation requesting a deviation. Courts can deviate from the guideline amount when the standard formula produces an unfair result, but deviations require a written finding explaining why the guidelines don’t fit, so document the reasoning thoroughly.1Office of the Law Revision Counsel. 42 USC 667 – State Guidelines for Child Support Awards
How the Formula Divides the Obligation
Once income and expenses are entered, the worksheet does the arithmetic. Under the income shares model, the calculation combines both parents’ gross incomes, looks up the corresponding base support obligation in the state’s schedule table, and divides that obligation proportionally. If one parent earns 65 percent of the combined income, they’re responsible for roughly 65 percent of the support amount.2Administration for Children and Families. How Is the Amount of My Child Support Order Set? Add-on expenses like healthcare premiums and childcare costs use the same income ratio. The parent who pays an expense directly gets a credit; the other parent’s share becomes part of the support obligation.
Under the percentage of income model, the math is simpler. The noncustodial parent’s income is multiplied by a percentage set by the state, which increases with the number of children. The custodial parent’s income doesn’t enter the formula, though it may be considered if a deviation is requested.
After the formula produces a number, apply any parenting time adjustment, then subtract credits for expenses the paying parent covers directly, like the child’s health insurance premium. Double-check every entry before moving to the final line. A transposed digit or a forgotten deduction will carry through the entire calculation.
A Note on Taxes
Child support payments are not deductible by the parent who pays them, and they are not taxable income to the parent who receives them.3Internal Revenue Service. Alimony, Child Support, Court Awards, Damages 1 People confuse this with the pre-2019 rules for alimony. On the worksheet, use gross income figures as your state directs. Do not reduce your income by the support you expect to pay, and do not inflate the other parent’s income by the support they expect to receive. The worksheet handles the allocation; your job is to report raw numbers.
Filing and Retroactive Support
Once the worksheet is complete, file it with the court along with your supporting documents. Some jurisdictions require electronic filing; others still accept paper. Filing fees can range from nothing to several hundred dollars depending on the jurisdiction and whether you qualify for a waiver.
Attach the documentation: tax returns, pay stubs, insurance policy details, childcare contracts, and receipts for extraordinary expenses. Missing documents are the most common reason courts continue a hearing to a later date, which means more time without a finalized order.
In most states, child support can be ordered retroactive to the date you filed your petition, not the date the judge signs the order. That gap can be months. If you’re seeking support, filing promptly matters because every week of delay is a week of support you may not recover. If you’ll be paying, understand that an obligation may be accruing from the filing date forward, even before the hearing.
Signing Under Penalty of Perjury
Child support worksheets are signed under penalty of perjury. Intentionally underreporting income, hiding assets, or inflating expenses can lead to sanctions well beyond simply recalculating the support amount. If the other parent suspects dishonesty, they can use the discovery process to compel disclosure of bank records, tax returns, business records, and investment accounts. A judge who finds that a parent concealed income or assets can impose attorney’s fee awards to the other side, contempt findings, and an adjusted support order reflecting the true income. In extreme cases, a perjury charge is possible. Omitting a side job, rental income, or bonus pay is the single fastest way to lose credibility, because if the other parent discovers undisclosed income, the court will question everything else on the worksheet.