Self-employed or variable income: how support is calculated and when income gets imputed

The child support tables and the spousal support formulas both start with one number: income. For an employee it is on line 15000 of a Canadian return or a W-2 in the US, and the argument is over in a minute. For a business owner, a contractor, a realtor, a tradesperson or anyone whose income moves around, that number is where the argument begins. This guide explains how the number gets built and what you can do about it.

Start with the tax return, then adjust

In Canada, section 16 of the Federal Child Support Guidelines starts with total income on the return. Sections 17 to 19 and Schedule III then require adjustments. Most US states apply the same logic under their own guidelines: gross income from all sources, with specific rules for self-employment. The recurring adjustments are:

Add back personal expenses run through the business

The vehicle that is 80 percent personal. The phone plan for the family. Meals, travel, home office costs beyond what is reasonable, and salary paid to a new partner for work that was not really done. Courts routinely add these back to income for support purposes. Section 19(1)(g) of the Canadian Guidelines allows this where expenses are not reasonably necessary to earn the income.

Corporate retained earnings

If the payor controls a corporation, section 18 lets the court include the corporation's pre-tax income in the payor's income where the corporate structure is being used to shelter earnings. The payor can show that retained earnings are genuinely needed for the business, for example to buy equipment or maintain working capital. The onus is on them to explain it.

Non-taxable and low-tax income

Capital gains are included at their actual amount, not the taxable portion. Dividends are grossed up back to their actual value. Tax-free income, such as some Indigenous employment income or certain disability benefits, is grossed up to what an employee would need to earn pre-tax to receive the same amount.

Fluctuating income: averaging

Section 17 of the Canadian Guidelines allows a court to use the average of the last three years where the current year is not a fair reflection. Many US states do the same. Be ready to argue which years count. A commissioned salesperson who had one blowout year will want a three-year average. A payor whose income has been rising steadily will find the recipient asks for the most recent year. Courts look for the fairest predictor of the coming year, not the most convenient.

Imputed income

Imputing means the court assigns an income to a parent that is higher than what they actually earn. Section 19 of the Canadian Guidelines lists the grounds. Common ones:

• Intentional underemployment or unemployment. Quitting a job, refusing available work, or moving to a lower-paid field without a good reason. Courts ask what the person could reasonably earn given their education, experience, health and the local job market.
• Failure to disclose. If a parent will not produce financial information, the court can simply pick a number, and it tends not to pick a low one.
• Lifestyle inconsistent with declared income. If the payor drives a new truck, travels frequently and pays a large mortgage on a declared income of $40,000, the court can infer real income is higher.
• Diverting income to a new spouse, a family member or a corporation.
• Unreasonable deductions. The add-back described above.

In the US, almost every state's guidelines allow imputation for voluntary unemployment or underemployment and for unreported income. Some states impute a minimum, such as full-time minimum wage, to a parent with no verified income.

Imputation cuts both ways. A recipient spouse who chooses not to work when they reasonably could may have income imputed for the purpose of spousal support, reducing what they receive.

Gig, seasonal and contract work

Rideshare, delivery, seasonal trades and short contracts are treated like any other self-employment: gross receipts minus legitimate business expenses, averaged where needed. Platform tax summaries and bank deposits are the evidence. Cash income is still income; a lifestyle analysis will find it.

What to disclose

Expect to provide, and to request:

• Three years of personal tax returns and notices of assessment
• Three years of corporate or partnership financial statements and tax returns
• Year-to-date income and expense summaries
• Statements for every business bank account
• Details of any salary, dividends, management fees or benefits paid to family members
• Current contracts, commission statements or platform earnings summaries

Spousal support has an extra layer

For spousal support in Canada, the SSAG formulas use the same income determination as child support. But where a payor's business income is also the basis for a property payout, watch for the double-dipping issue explained in dividing a business at separation. And where a payor's income is genuinely volatile, agreements sometimes set support as a percentage of income within a floor and ceiling rather than a fixed amount.

If you are the self-employed parent

The best defence is transparency. Clean books, a market-rate salary paid to yourself, personal expenses kept personal, and full voluntary disclosure. Judges and mediators can tell the difference between a business owner with real variability and one playing games, and they treat the two very differently.

This guide is legal information, not legal advice, and it is written for a general audience across Canada and the United States. Family law is provincial and state-based and changes over time. Before you rely on anything here for your own situation, confirm it with a qualified family lawyer in your province or state. FairWell can connect you with one through the professional directory.