A one-time stock sale nearly set the wrong support number

The situation

The question Mihaela kept coming back to was not what a support order would say on paper, but whether she could still make rent in eight months if the number changed again. She and Sukhwinder had separated after twelve years together, and their fifteen-year-old, Amrit, split time between two households in Grimsby, though his school and most of his routines stayed anchored to Mihaela's apartment. Mihaela worked as a delivery courier, paid by the run rather than by the hour, and her own income moved with the season and with gas prices. Sukhwinder worked as a veterinary technician at a local clinic, a job with a steadier paycheque, but a total income that, on paper, had spiked sharply the year before separation.

That spike was the problem. Sukhwinder had sold shares that had been sitting in an investment account for years, cashing out a gain to help cover moving costs and a vehicle repair. On a tax return, that gain shows up as income for the year it was realized, even though it was a one-time event that would not repeat. If a support amount got calculated using that year's total income line without adjustment, it would look like Sukhwinder earned far more than the job actually paid, and far more than either of them could expect going forward.

Mihaela did not want a support order that looked generous on paper for one year and then dropped sharply the next, leaving her to explain to Amrit why things had gotten tighter again. With combined household income under $45,000 and little in savings on either side, there was no cushion to absorb a bad guess. She needed a figure she could actually plan a budget around, not one that matched a single unusual tax year and nothing else.

That was what brought her to our office - not a dispute about whether support should be paid, but a fear that the number itself would be built on a foundation that would not hold once the following year's tax return came in and looked completely different. She had already seen, from friends who had been through separations of their own, how much damage a support order set on the wrong number could do to a household with no margin for error.

Where it went wrong

Support in Ontario starts from a specific figure, usually the total income line from the paying parent's most recent tax return, adjusted for a short list of items the guidelines allow. In most years that line is a reasonable stand-in for what a parent can actually pay, because most income repeats: a paycheque, a wage, a mostly steady set of hours. Sukhwinder's tax return told a different story for one year only. Because the shares had been held for a long time and had gained significant value before the sale, the reported income for that year included both the veterinary technician's regular pay and the entire realized gain, folded into a single lump sum.

Used without adjustment, that total income figure would have produced a support amount well above what Sukhwinder's ongoing pay could sustain. The guidelines do allow for adjustments where a parent's income is unusually high or low compared to prior years, but making that case takes more than pointing at a tax return and asserting it was a fluke. It requires showing the pattern: what income looked like in the years before the sale, what it returned to afterward, and why the sale itself was a closed, non-repeating transaction rather than an ongoing source of investment income.

That is where the file had actually gone sideways before it reached us. Sukhwinder had tried to explain the situation directly, sending Mihaela a short note and a copy of the trade confirmation from the brokerage. But nobody had gone back through several years of returns to actually demonstrate the pattern. Without that groundwork, the claim that the gain was unusual looked like an assertion rather than a fact, and Mihaela was understandably reluctant to simply take Sukhwinder's word that the number was a one-off.

Both sides, in fact, had a legitimate position and no shared set of facts to test it against. The dispute was not really about willingness to pay. It was about which number was the honest one to build an order on, and neither side had the accounting to prove their version to the other.

There was also a timing problem sitting underneath the accounting one. Support amounts, once set, are not easily unwound. If Mihaela accepted a number built on the spiked year, reversing it later would mean going back to renegotiate or return to the process a second time, an outcome neither parent wanted to repeat. If she rejected the spike entirely and it turned out Sukhwinder really could sustain a higher figure going forward, Amrit would be the one who went without in the meantime. Getting the number right the first time mattered more than usual, precisely because both households had so little room to absorb a correction later.

What we did

1. Requested six years of tax returns and notices of assessment from both parents, because a single year could not show whether the spike was truly unusual - only a longer pattern could establish what Sukhwinder's income had looked like before the sale and what it returned to afterward, giving us a factual baseline instead of a guess about what was ordinary and what was not.
2. Isolated the realized gain from ongoing employment income line by line, using the brokerage's trade confirmation and the capital gains schedule attached to that year's tax return, so the one-time amount could be identified precisely rather than estimated. A rough split between wages and gain would have been just as easy to dispute as the original, unadjusted total, so the goal was a figure sourced closely enough that nobody could later argue we had understated or inflated it to suit our client.
3. Built a three-year average of Sukhwinder's employment income excluding the gain, which gave both sides a defensible ongoing figure that reflected what the veterinary clinic job actually paid rather than what one unusual transaction had temporarily added to a single year's return. Three years was not arbitrary - it mirrors the window the guidelines themselves look to when a parent's income needs to be assessed as a pattern rather than a single snapshot.
4. Cross-checked the average against pay stubs and the clinic's confirmation of hours, because a tax-return average alone can still be skewed by a partial year, unpaid leave, or a temporary change in shifts that would not necessarily show up on the return itself. We wanted a number built from two independent sources, not one, so it would hold up if Sukhwinder's side questioned the methodology later.
5. Prepared a short written explanation of the methodology for Mihaela, in plain language, walking through why the average excluded the gain, how the three years were chosen, and how the resulting number compared to the years on either side of the spike, so she could evaluate the proposal on its merits and ask questions before it went anywhere near a negotiation.
6. Opened negotiations with Sukhwinder's side using the rebuilt figures as the starting point, which shifted the conversation away from a dispute over motives - whether the spike was being hidden or exaggerated - and toward a narrower discussion of which specific adjustments to the averaging were reasonable, since both sides could now see and check the same underlying numbers for themselves.
7. Proposed a blended support figure with a scheduled review after eighteen months, addressing Mihaela's real fear directly - that a number set today might already be wrong by the time Amrit needed new school supplies or activity fees the following year, and that finding out would mean starting the whole argument over again from nothing. Building the review date into the proposal up front, rather than waiting for a dispute to force one later, gave both parents a reason to accept a figure neither had originally asked for.
8. Documented the agreement in writing, with the averaging method, the top-up amount, and the review date all spelled out in enough detail that either parent could reapply the same method themselves later, so that if either parent's income shifted again, the next conversation would start from an agreed process rather than another argument from scratch. That written record was what let the eighteen-month review happen without needing a lawyer involved a second time.

The outcome

The parents settled on a support figure based on the three-year averaged income rather than the single inflated year, with Sukhwinder agreeing to a modest top-up for the specific year the gain was realized, paid over several months rather than all at once. Neither side got exactly what they had first proposed. Mihaela had initially wanted the full guideline amount calculated from the spiked year; Sukhwinder had initially wanted the gain excluded entirely with no acknowledgment at all. The compromise split that difference in a way that reflected what the accounting actually showed, rather than what either parent had first assumed was fair.

The scheduled review mattered as much as the number itself. Rather than leaving Mihaela to wonder whether the figure would hold, or leaving Sukhwinder guessing whether another year's return would trigger a fresh dispute, both parents built in a fixed point to revisit the calculation using the same method, with updated returns. That took the guesswork out of the next conversation and gave Mihaela the budgeting certainty she had come in asking for, even if that certainty was a moving figure on a schedule rather than a locked one for good.

It was not a clean resolution in the sense that everyone walked away fully satisfied. Sukhwinder still felt the top-up conceded more than the gain's one-time nature warranted, and Mihaela still felt the average understated what a full guideline year would have paid on paper. But both parents could see the same numbers, understand how the figure had been reached, and plan a household budget around it - which, for two households with no financial cushion between them, was worth more in practice than either side winning the argument outright.

Amrit's routine did not change through any of it, which had been part of the point. The agreement let both parents keep paying for the same activities and school costs without a gap opening up while the numbers were being sorted out.

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