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 line 15000 on a Canadian return or the wages on a US W-2, and the discussion is over quickly. For a business owner, contractor, realtor, tradesperson or anyone whose income moves around, that number is where the disagreement begins.

If you are the one with the business, you may feel you are being accused of hiding money when you are simply running a business. If you are on the other side, you may feel sure the real income is higher than the paperwork shows, with no way to prove it. Both are common. The rules below are how courts and mediators get to a number both people can live with.

Start with the tax return, then adjust

In Canada, section 16 of the Federal Child Support Guidelines starts with "total income" on the tax return, and sections 17 to 20 and Schedule III then allow adjustments. The same income figure is normally used for spousal support under the SSAG. In the US, state guidelines generally start with gross income from all sources and have their own rules for self-employment, often allowing ordinary and necessary business expenses but not personal costs. The most common adjustments are below.

Add back personal expenses run through the business

The vehicle that is mostly personal. The family phone plan. Meals, travel and home office costs beyond what is reasonable. Salary paid to a new partner or relative for work that was not really done. Section 19(1)(g) of the Canadian Guidelines allows income to be imputed where expenses are deducted unreasonably, and it says the fact that the Income Tax Act allows a deduction does not settle whether it is reasonable for support.

Corporate income you control

If a parent is a shareholder, director or officer of a corporation, section 18 lets the court include all or part of the corporation's pre-tax income, or an amount reflecting the value of the parent's services, where their personal income does not fairly reflect the money available to them. Retained earnings that are genuinely needed in the business, for equipment, working capital or debt, can be left out, but the parent who controls the company has to show why.

Non-taxable and low-tax income

Under Schedule III, capital gains are counted at their actual amount rather than the taxable half, and dividends are counted at the actual amount received rather than the grossed-up taxable figure. Where income is tax-free or taxed at a low rate, section 19 allows it to be grossed up so it is comparable to employment income.

Fluctuating income: averaging

Section 17 of the Canadian Guidelines allows a court to look at the last three years where the current year is not the fairest measure, for example because of a one-time bonus or a bad year. Many US states also average variable income. Which years count is often the real argument. A commissioned salesperson with one exceptional year will want a three-year average. A business owner whose income is rising steadily will find the other side wants the latest year. Courts look for the fairest predictor of what is coming, not the most convenient figure for either side.

Imputed income

Imputing means the court assigns income to someone that is higher than what they report. Section 19 of the Canadian Guidelines lists situations where this can happen, and courts also draw inferences from how a person lives. Common grounds:

• Intentional underemployment or unemployment. Quitting, refusing available work, or moving to a lower-paid field without a good reason. There are exceptions for a child's needs or a parent's reasonable health or education needs. 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 they are required to provide, the court can pick a number, and it tends not to pick a low one.
• Lifestyle inconsistent with declared income. A new truck, frequent travel and a large mortgage on a declared income of $40,000 invites the conclusion that real income is higher.
• Diverting income to a new partner, family member or corporation.
• Unreasonable deductions, the add-back described above.
• Property not reasonably used to generate income, such as large sums left idle.

In the US, state guidelines generally allow income to be imputed for voluntary unemployment or underemployment and for unreported income. Some states impute a set figure, such as full-time minimum wage, where a parent has no verified income.

Imputation cuts both ways. A spouse receiving support who chooses not to work when they reasonably could may have income imputed for spousal support, which reduces 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, and a lifestyle or bank deposit analysis will usually find it.

What to disclose

Expect to provide, and to request:

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

The financial disclosure checklist lists everything in one place.

Spousal support has an extra layer

In Canada, the SSAG use essentially the same income figure as child support. But where a business is being valued for property division and its income is also used for support, watch for double counting, explained in dividing a business at separation. Where income is genuinely volatile, some agreements set support as a percentage of actual income each year, within a floor and a ceiling, instead of a fixed amount.

If you are the self-employed parent

The best protection is transparency. Clean books, a reasonable 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 ups and downs and one playing games, and they treat the two very differently. Paying your accountant to prepare a short income-for-support summary is usually money well spent.

If your ex is the self-employed one

You do not have to prove exactly what they earn. You need enough to show the declared figure doesn't add up. Keep copies of anything you already have: past returns, statements, loan or mortgage applications (which often state a higher income), and notes about lifestyle and spending. Ask for disclosure in writing with a deadline. If it doesn't come, that refusal is itself evidence. Where the business is significant, an income report from a chartered business valuator or forensic accountant may be worth the cost; ask a lawyer whether your case justifies one. If you suspect money is being moved, read hidden assets: the warning signs.

What to do this week

1. Gather three years of returns for yourself, and any business statements you can access.
2. List personal expenses currently paid through the business, honestly, with rough annual amounts.
3. Calculate a three-year average alongside the most recent year so you know both numbers.
4. Send or request disclosure in writing, with a reasonable deadline, such as 30 days.
5. Run both figures through a support calculator to see the difference it makes before you argue about it.

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. How we write and check our guides.