How Courts Impute Income Under Section 19 of the Guidelines
Child support in Canada runs off guideline income — normally line 15000 of the payor's tax return. But when the tax return understates true earning capacity, s.19(1) of the Federal Child Support Guidelines lets the court impute income. The listed grounds include intentional under-employment or unemployment (s.19(1)(a)), exemption from paying tax, diversion of income, unreasonable deductions from income (s.19(1)(g)), income from dividends or capital gains taxed at lower rates, and failure to provide disclosure — where courts routinely draw adverse inferences and pick a number. Section 18 separately allows attributing a controlled corporation's pre-tax income to its shareholder-parent.
The Reasonableness Standard
Most provinces' appellate courts apply a reasonableness test to under-employment: a parent must earn what they are capable of earning given age, education, skills, health, and the local job market, and no bad-faith intent to evade support needs to be proven. A parent who resigns a $110,000 position for a $45,000 lifestyle business, without health or caregiving justification, can expect the missing $65,000 to be imputed in whole or in part. Legitimate exceptions built into s.19(1)(a) protect under-employment required by the needs of a child of the marriage or by reasonable educational or health needs.
Worked Example
A parent of two children claims $45,000 after leaving a trade where they earned $105,000 for three straight years. The court finds the change voluntary and imputes 80% of the $60,000 gap, fixing guideline income at $93,000. The approximate two-child table amount rises from about $680/month to about $1,390/month — an increase of roughly $710/month ($8,500/year), and the imputed figure also drives s.7 proportionate shares and any spousal support calculation.
When to Consult a Family Lawyer
Imputation cases are evidence-heavy: wage surveys, vocational assessments, corporate records, and disclosure motions decide them. Get advice if the other parent's declared income dropped suspiciously around separation, if income flows through a corporation, or if you are the under-earning parent and need to document health, retraining, or caregiving reasons before a court fixes a number you cannot earn.
Explore more free tools on our Family Law Calculators hub, walk through our interactive Family Law Wizards to understand your situation step by step, or contact LexScale.ai to build calculators like this for your own law firm website.
How This Calculator Works
Enter the income the parent claims, the income the evidence says they could earn — prior tax returns, occupational wage data, hours available versus hours worked — and the portion of that gap a court is likely to attribute to them. The tool produces the support-relevant income after imputation and estimates how much the table child support changes as a result, monthly and annually. Imputation is discretionary, so the slider matters: full imputation of the gap is common where underemployment is clearly deliberate, while partial imputation is common where retraining, health, or childcare obligations explain some of the shortfall.
Evidence That Wins Imputation Arguments
- Three or more years of prior tax returns showing historical earning capacity.
- Occupational wage data for the parent's trade or profession in their region.
- Job postings the parent is qualified for, and evidence of a lackluster job search.
- The timing of the income drop — a resignation filed weeks after a support application speaks for itself.
- Corporate and business records where income flows through a company the parent controls — retained earnings, personal expenses run through the business, and income splitting with a new partner are all classic imputation grounds.
- Lifestyle evidence: spending inconsistent with declared income invites the court to find undisclosed capacity.
The parent resisting imputation needs the mirror image: documented medical limitations, proof of a diligent job search, evidence that the career change was reasonable and made in good faith, and a credible explanation of business losses. Courts do not require a parent to hold the highest-paying job conceivable — they require reasonable efforts to earn what the parent is capable of, judged against age, health, education, and the job market. Intentional does not mean malicious: a parent who chooses a lower-paying passion career still faces imputation if children depend on the lost income.