Bonuses, stock options, and capital gains almost always count as income for child support, though courts fold each type into the guideline formula differently depending on whether the money is recurring, vested, realized, or a one-time windfall. Federal regulations require every state to consider all earnings and income when setting support, so the calculation reaches well past base salary.1eCFR. 45 CFR 302.56 – Guidelines for Setting Child Support Orders The number the state formula produces carries a rebuttable presumption of correctness, meaning a judge applies it unless written findings show the result would be unjust.2Office of the Law Revision Counsel. 42 USC 667 – State Guidelines for Child Support Awards For parents on either side of an order, understanding how variable pay enters that formula can be the difference between a fair result and one that misses tens of thousands of dollars.
What Counts as Income
State guidelines cast an unusually wide net. The federal definition of income subject to child support withholding includes wages, salaries, commissions, bonuses, workers’ compensation, disability payments, pension and retirement income, and interest.3Administration for Children and Families. A Guide to an Employer’s Role in the Child Support Program Most states also count unearned income: rental receipts, trust distributions, dividends, and investment returns. During discovery, courts review tax returns, pay stubs, brokerage statements, and employer records to reconstruct what each parent actually brings in.
Because the guideline number is presumed correct, the burden falls on the parent arguing against it, not on the parent relying on it. A parent earning substantial money through options or bonuses cannot simply argue those sources are too complicated to include. The court will find a way to count them.
Bonuses and Commissions
Cash bonuses and sales commissions are the most common variable income in support disputes. Because these payments fluctuate, courts use two main approaches.
Income Averaging
A judge reviews two or three years of bonus and commission history and calculates a monthly average, which gets added to base salary for the guideline formula. Averaging works when patterns are stable. A salesperson who consistently earns between $40,000 and $60,000 in annual commissions gives the court a reliable range. The weakness: averaging overstates income in a down year and understates it in a boom, which often sends the disadvantaged parent back to court.
Percentage-Based Add-On Orders
Instead of baking an estimate into the monthly payment, the court sets base support using regular salary alone and orders the paying parent to turn over a set percentage of every bonus or commission check as additional support. When the bonus is large, the child benefits proportionally; when it is small or nonexistent, neither parent needs to file anything. The percentage usually mirrors the state’s guideline formula applied to the bonus income alone.
Add-ons tend to work better for truly unpredictable pay. A tech executive whose annual bonus swings from zero to six figures, or a real estate agent riding the market, is a poor candidate for a static average. If you’re the receiving parent and the other side’s pay is genuinely volatile, an add-on order usually protects the child more effectively than a fixed number that will be outdated within a year.
Stock Options and Equity Compensation
Equity pay creates the trickiest questions because value is not cash in hand until specific conditions are met. Restricted stock units and stock options are the two most common forms, and courts handle them differently.
Restricted Stock Units
An RSU is a promise from an employer to deliver actual shares once a vesting schedule is satisfied. Before vesting, the parent owns nothing and cannot sell. Once the RSU vests, the parent receives the stock outright, and the fair market value on that date is taxed as ordinary income, just like wages.
Most courts treat vested RSUs as income in the year they vest, whether the parent sells the shares or not. The parent now owns unrestricted stock worth a known dollar amount, and the tax code treats it as compensation. If a parent receives $80,000 in vested RSUs in a year, that amount typically gets added to gross income for support. Arguing the shares are not really income because they have not been sold is a losing position, since the parent could liquidate them any time.
Stock Options
Stock options give a parent the right to buy company shares at a fixed strike price. Profit comes from the spread between that strike price and the market price at exercise. Unlike RSUs, options require an affirmative step: the parent must choose to exercise.
Courts generally wait to include option income until the parent exercises and realizes the gain. But if a parent sits on deeply in-the-money options specifically to keep reported income low, a court can impute income based on what those options are worth on the open market. Judges see this tactic regularly, and financial discovery almost always reveals the holdings.
The Double-Dipping Problem
When a divorce involves both property division and ongoing support, stock options and RSUs can create a double-counting issue. If the court already divided unvested options as a marital asset during the divorce, counting that same value again as income when the options later vest would be unfair. Courts in many states recognize this as impermissible double dipping and exclude from the support calculation any equity compensation already divided as property.
The distinction matters most for options or RSUs granted during the marriage but vesting after. Equity granted entirely after separation typically faces no double-dipping issue and counts fully as income. Keeping meticulous records of grant dates, vesting schedules, and what the property settlement addressed pays off. Without that documentation, a parent can end up paying support on income that was already split.
Capital Gains and Investment Income
Realized capital gains, the profit from selling stocks, real estate, or other assets, are generally treated as income in the year the sale occurs. If a parent sells an investment property for a $200,000 profit, that gain typically gets added to income for that year. The critical question is whether the gain recurs. A parent who regularly trades stocks or flips houses generates capital gains that look like business income, and courts treat them that way. A one-time sale of a vacation home is harder to categorize; some courts exclude it entirely, others spread the impact across multiple years to avoid a spike that distorts the monthly obligation.
Unrealized gains generally do not count. A stock portfolio up $50,000 on paper puts no money in the parent’s pocket until shares are sold.
Dividends and interest are more straightforward. They are recurring cash flows, and courts include them in gross income the same way they include wages. A parent earning $15,000 per year in dividends sees that amount folded into the formula.
For self-employed parents or those with business investments, expense deductions get close scrutiny. A parent running income through a business may deduct depreciation, vehicle costs, or home office expenses that reduce taxable income without reflecting real limits on available cash. Courts routinely add back accelerated depreciation, personal expenses run through a business, and discretionary retirement contributions when calculating income available for support. Cases involving business owners often turn expensive because both sides need professional help separating legitimate business expenses from lifestyle spending coded as deductions.
Windfalls: Inheritances, Lottery, and Settlements
A large lump sum creates a problem for a formula built around monthly income. Courts typically distinguish between the lump sum itself and what it produces over time.
Inheritances illustrate the principle. Many jurisdictions treat inherited principal as an asset rather than income. Receiving a $500,000 inheritance does not automatically mean the parent’s income jumped by half a million. But the investment returns count. If the parent invests the inheritance and earns $25,000 per year in interest or dividends, that $25,000 becomes part of the calculation. Some courts go further: even if the parent parks the cash in a non-interest-bearing account, a judge may impute a reasonable rate of return and treat the hypothetical earnings as income anyway.
Lottery winnings tend to be treated more aggressively because the proceeds are pure gain with no offsetting labor or prior investment. Annuity payments typically count as income each year they arrive. Lump-sum payouts may be amortized over the child’s remaining minority or treated as an income-producing asset whose returns feed the formula.
Lawsuit settlements depend on what the payment compensates. Money for lost wages is almost always income because it replaces earnings the parent would have received. Settlements for pain and suffering or property damage are more often treated as non-income assets. A $300,000 personal injury settlement that includes $100,000 for lost wages will likely see at least that wage-replacement portion pulled into the calculation.
When applying a windfall to the standard formula produces a support amount that far exceeds the child’s reasonable needs, courts have authority to deviate downward with written findings that strict application would be unjust.2Office of the Law Revision Counsel. 42 USC 667 – State Guidelines for Child Support Awards Do not assume this deviation is easy to get. Courts default to the formula, and the parent arguing for a lower number carries the full burden.
How Taxes Affect the Net Number
Gross income is the starting point, but most states calculate support on net disposable income after mandatory withholding. This matters for variable pay because bonuses and equity often face heavier tax treatment than regular wages.
Bonuses and commissions are classified as supplemental wages under federal tax rules and are subject to a flat 22% federal income tax withholding rate. That rate jumps to 37% on supplemental wages exceeding $1 million in a calendar year.4Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide The 22% is only the federal income tax piece. The parent also owes Social Security tax at 6.2% on earnings up to the 2026 wage base of $184,500, plus Medicare tax at 1.45% with no cap.5Social Security Administration. Contribution and Benefit Base State income taxes stack on top.
In practice: a parent earning $150,000 in base salary who receives a $50,000 bonus will see roughly $11,000 withheld in federal income tax on that bonus, about $2,140 in Social Security tax (only on the portion below the wage base, since salary consumed most of the $184,500 threshold), $725 in Medicare tax, plus state taxes. The $50,000 bonus might yield $32,000 to $37,000 net, and the support formula applies to that net figure rather than the full amount.
High earners who pass the Social Security wage base early in the year see a different effect: later bonus checks escape the 6.2% Social Security tax entirely, slightly increasing net income available for support. This is one reason recalculating support mid-year from a single pay stub can mislead, and why courts prefer full-year figures.
When a Parent Hides Income
Courts can also assign income based on what a parent could earn with reasonable effort. This is imputation, and it is the primary tool against a parent who deliberately suppresses income to reduce support.
Federal regulations require that when a state authorizes imputation, the calculation account for the parent’s specific circumstances: assets, employment history, job skills, education, health, criminal record, and the local job market.1eCFR. 45 CFR 302.56 – Guidelines for Setting Child Support Orders A parent who walks away from a $200,000 job without a compelling reason will likely have income imputed at or near that prior salary. A parent laid off who can show genuine job search efforts generally sees a lower imputed figure based on comparable local positions.
Imputation applies to variable income too. A parent who historically received $30,000 to $50,000 in annual bonuses and conveniently stops receiving them after a support petition, perhaps by asking the employer to restructure compensation, can expect a judge to see through it. The same logic extends to stock options: sitting on exercisable options worth $100,000 while claiming low income tends to collapse once discovery reveals the holdings.
Modifying Support When Income Changes
A one-time bonus or windfall does not automatically change an existing order. To adjust the amount, the parent seeking the increase must file a petition for modification and demonstrate a substantial change in circumstances. Timing is critical: child support payments already come due cannot be retroactively modified. Each payment becomes a judgment by operation of law on its due date.6eCFR. 45 CFR 303.106 – Procedures to Prohibit Retroactive Modification of Child Support Arrearages
The one exception is that a court can modify support back to the date the modification petition was filed and the other parent received notice.6eCFR. 45 CFR 303.106 – Procedures to Prohibit Retroactive Modification of Child Support Arrearages This creates real urgency. If you learn the other parent received a major bonus in January and wait until June to file, you have lost five months of potentially increased support that no court can recover. File promptly, even before you have complete documentation.
Federal law also requires states to review and adjust orders at least every three years when either parent requests it.7Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement If the paying parent’s compensation has shifted significantly, moving from salary-only to equity-heavy, for example, the three-year review lets you recalculate without a specific triggering event.
Percentage-based add-on orders sidestep much of this. Because the order captures variable income as it arrives, the receiving parent does not have to file every time a large bonus hits.
Garnishment Limits on Bonus Checks
Federal law caps how much of a parent’s disposable earnings can be garnished for child support, and the caps apply to bonus and commission checks the same way they apply to regular wages. The ceiling depends on whether the paying parent supports other dependents and whether the garnishment covers overdue support:
- 50% of disposable earnings if the parent supports another spouse or child and owes only current support
- 55% if the parent supports other dependents and owes back support more than 12 weeks overdue
- 60% if the parent does not support other dependents and owes current support only
- 65% with no other dependents and back support more than 12 weeks overdue
These thresholds come from the Consumer Credit Protection Act and override any state law that sets a lower limit.8Office of the Law Revision Counsel. 15 USC 1673 – Restriction on Garnishment For a parent receiving a $30,000 bonus with roughly $20,000 in disposable earnings after taxes, maximum garnishment could reach $13,000 in a single pay period. These limits most often come into play when a parent owes arrears and a large bonus triggers aggressive employer withholding.
When to Hire a Forensic Accountant
A salaried employee with a straightforward W-2 does not need professional financial analysis. But when compensation involves multiple equity grants, business ownership, active trading, or layered bonus structures, a forensic accountant can be worth every dollar. These professionals dig into tax returns, brokerage statements, corporate filings, and employer records to reconstruct a true income picture the other parent may be working to obscure.
Fees typically run $150 to $750 per hour depending on complexity and location. For a case involving a tech executive with staggered RSU vesting, deferred compensation, and option exercises spread across tax years, the analysis might cost several thousand dollars. That investment often pays for itself when it uncovers income the other parent failed to disclose. Courts can sometimes order the higher-earning parent to cover those costs as part of the proceedings, particularly when the income disparity between the parents is significant.