A Sister's Corporation, a Missed Filing, and a Higher Tax Bill

The situation

The number on the reassessment notice was roughly ninety thousand dollars in additional federal and provincial tax, spread across two taxation years, plus interest that had been accumulating since the original filings went in. That was the figure Seo-yeon brought to our office, and it was the first thing we put on the table before anything else, because it framed everything that followed: this was not a paperwork irregularity that could be waved away, it was real money that a small corporation had to find.

Seo-yeon worked as an HVAC technician and, several years earlier, had incorporated a small company to hold and manage a handful of rental units around Stoney Creek. The corporation did more than collect rent. It also performed maintenance and light property management work for a related company, one that held a larger portfolio of rental properties and was owned by Seo-yeon's sister Ha-eun, a registered nurse, together with her spouse Sanja. The arrangement made practical sense: Seo-yeon's corporation had the trade skills, Ha-eun and Sanja's corporation had the buildings, and one paid the other a management and maintenance fee every year.

For the first year of the arrangement, the two corporations had signed a short agreement dividing up a portion of the small business limit between them, which let Seo-yeon's corporation tax its share of the income at the lower small business rate instead of the higher general corporate rate. After that first year, the paperwork stopped. Nobody signed anything for the next two years, even though the payments kept flowing exactly as before.

When the Canada Revenue Agency audited the paying corporation for an unrelated reason, the auditor noticed the payments to Seo-yeon's corporation and asked a simple question: where was the assignment for these two years? There wasn't one. Because Seo-yeon and Ha-eun were related, and each held an interest in the other's corporation, the income Seo-yeon's corporation earned from the related company was specified corporate income, and specified corporate income only qualifies for the lower rate to the extent the paying corporation formally assigns part of its own business limit. Without a signed assignment for those two years, the higher rate applied to the whole amount, and the reassessment followed.

The gap between the two corporate tax rates is not a small one, and it compounds quickly when applied to two full years of fees rather than a single quarter. Seo-yeon's corporation had been treating the arrangement as settled since the first year, filing its returns the same way each time, so the size of the reassessment came as a genuine shock. There was no suggestion from the CRA that the underlying business relationship was invented or that the services had not actually been performed. The dispute began and ended on a single question of documentation, but the dollar figure attached to that question was large enough to change how seriously it needed to be taken.

Where it went wrong

This was not Seo-yeon's first conversation with our office about this exact issue. When she incorporated her company and set up the maintenance arrangement with Ha-eun and Sanja's corporation, she had come in for advice, and the advice was specific: because the two corporations were related through her and her sister's ownership interests, any income from one to the other needed a fresh, signed business limit assignment every single year, not a one-time document that could be treated as evergreen. We had explained why the rule existed, walked her through the form, and told her plainly that skipping a year would put the income at the higher rate for that year.

Seo-yeon understood the advice at the time. What she did not do was build a routine around it. The first year's agreement got signed because it was part of setting up the corporation and everyone was paying close attention to the paperwork. After that, the corporations kept operating the same way, the payments kept being made and recorded, and the annual filing habit never took root. Ha-eun and Sanja assumed Seo-yeon's side was handling it, since it was her corporation receiving the payments and her advisors who had raised the issue originally. Seo-yeon assumed that because nothing had changed about the business relationship, the original agreement still covered it.

That gap sat quietly for two years before the audit surfaced it. By the time it did, both corporations had filed two full sets of returns treating the income as eligible for the small business rate, without the documentation that made it eligible. The relationship between the two corporations had not changed and there was no dispute about the amounts paid or the work performed. The problem was entirely procedural: a missing signature, repeated twice, on a form that took perhaps twenty minutes to complete each year.

What made the conversation with Seo-yeon difficult was that this was avoidable in the most literal sense. We had told her what to do. She had agreed it made sense. And then daily business had simply crowded it out, until a routine tax audit of the other corporation turned a filing lapse into a six-figure exposure.

There was also a structural reason the lapse went unnoticed for as long as it did. Because the payments and the underlying work never changed, nothing in either corporation's day-to-day bookkeeping flagged a problem. The accountants preparing each corporation's returns each year worked from prior-year files and carried the small business rate forward as a matter of habit, without either of them independently checking whether the assignment paperwork existed for the current year. A single missing document, in other words, was quietly reproduced across two separate sets of filings before anyone caught it.

What we did

1. Reviewed both corporations' records together to confirm the underlying facts were not actually in dispute. We pulled invoices, bank records and the original incorporation documents for both companies and confirmed that the services described matched the payments made, and that the only missing piece was the annual assignment paperwork. Establishing this early meant the dispute could be framed narrowly, as a documentation failure rather than a challenge to the legitimacy of the business arrangement itself.
2. Approached Ha-eun and Sanja's corporation to negotiate a retroactive assignment for the two years in question. Because the corporations were related and the underlying relationship was cooperative, this was possible in a way it would not have been between arm's length parties, but it still required Ha-eun and Sanja's corporation to agree to give up part of its own business limit for those years, which had its own tax consequences for them that had to be worked through.
3. Assessed which year could realistically be fixed and which could not. Retroactive assignments are not automatically accepted, and the further back in time a corrective filing reaches, the harder it becomes to persuade the CRA to accept it. We concluded that the more recent of the two years had a reasonable chance of correction, while the earlier year was a weaker case given how much time had passed.
4. Filed a formal request to allow the late assignment for the stronger of the two years, with supporting evidence showing the business relationship, the consistent pattern of payments, and the genuine intention of both corporations to divide the limit as they had in year one. We were candid in the submission about the administrative lapse rather than trying to explain it away.
5. Negotiated with the CRA reviewer on the weaker year once it became clear a full reversal was unlikely. Rather than let both years go to a contested objection with an uncertain outcome and mounting interest, we proposed a partial settlement: accept the higher rate for the older year, in exchange for a firm resolution on the more recent one and a stop to further interest accrual once payment was made.
6. Put a standing compliance routine in place for both corporations going forward, tying the assignment filing to their fixed year-end date so it could never again be treated as optional or forgotten, with a calendar reminder sent to both Seo-yeon and Ha-eun independently rather than to just one side of the arrangement. This was as much about preventing a repeat as it was about resolving the current dispute.
7. Reviewed both corporations' accountants' engagement letters to close the gap that had let the lapse repeat itself unnoticed for two full years without either preparer catching it. We recommended that whoever prepared each corporation's return confirm, in writing, each year, that the current year's assignment document actually existed before carrying the small business rate forward, rather than assuming continuity from the prior year's file the way both accountants had been doing.

The outcome

The result was a genuine compromise, not a clean win. The CRA accepted the late business limit assignment for the more recent of the two years, which restored the small business rate to that year's income and reduced the reassessment for that portion substantially. For the older year, the agency held its position, and Seo-yeon's corporation paid the higher rate on that income along with the interest that had accrued on it. Combined, the settlement brought the roughly ninety thousand dollar exposure down to a figure in the low tens of thousands, still a real cost but a fraction of the original number.

Neither corporation walked away feeling entirely vindicated. Ha-eun and Sanja's corporation gave up part of its business limit for the year that was corrected, which meant less of its own income qualified for the lower rate that year, a trade-off they accepted once they understood the alternative was a longer and more expensive dispute for everyone involved. Seo-yeon accepted that the earlier year's cost was, in plain terms, the price of a document that had not been signed.

What changed most was not the tax bill but the habit. Both corporations now treat the annual assignment filing as a fixed item tied to their year-end, reviewed by our office each time rather than left to memory. Seo-yeon has said, since the dispute closed, that the lesson landed harder the second time because it came with a number attached to it. The arrangement between the two corporations continues much as it always did; only the paperwork around it changed.

Seo-yeon's corporation also carried a further, indirect cost in the interest that had accrued on the older year while the dispute was being negotiated, which is a reminder that the meter on a reassessment keeps running during any objection or negotiation, not just before it. Ha-eun and Sanja, for their part, said afterward that they wished the arrangement had included a shared calendar reminder from the start, something neither side had thought to set up when the corporations were newly formed and the relationship still felt informal.

What you can learn from this