TREADSTONE LAW · ONTARIO · DIGITAL LEGAL SERVICES · EST. MMXXI ·TSL
№ 354 Case Study — Tax

The Trustee, the Small Corporation, and a Missing Ledger

A family trust's small corporation faced instalment interest recalculated on a prior year's numbers, and the one document that could settle the question belonged to someone no longer involved.

Tax8 min readNewmarket, OntarioCorporate instalment interest
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ClientAbena, a trustee of a small family trust that owns a Newmarket corporation
The issueCorporate instalment interest was recalculated using a prior year's tax base after that prior year itself was reassessed
ServiceTraced the recalculation back to its source and located the original records that resolved the dispute
ResolutionThe instalment interest charge was reversed in full once the correct prior-year figures were confirmed

The situation

Abena's first call to our office started with an apology for not understanding the letter well enough to explain it properly over the phone. That was fair - the notice was dense even by CRA standards, and Abena, who worked as a dishwasher at a Newmarket restaurant and had taken on the role of trustee for a small family trust almost by default when an older relative could no longer manage it, had never handled anything like it before.

The trust held shares in a small corporation that ran a modest catering supply business, set up years earlier to keep a family asset structured in a way that would pass down cleanly. Abena and Yvette, a dental assistant and the trust's co-trustee, split the administrative work between them - Yvette handled the paperwork that came in the mail, and Abena handled calls and anything that needed a signature in person. Neither had a background in corporate tax, and the corporation's returns had always been filed by an outside bookkeeper the family trusted to get the numbers right.

The letter that prompted the call to us was not about a new problem. It was about instalment interest - the charge the CRA applies when a corporation's periodic tax instalments through the year turn out to be too low compared to what the final return shows was owed. The catch was that this particular instalment interest had been recalculated after the CRA reassessed the corporation's prior year return, adjusting the base figure the instalment requirement was measured against. The new instalment interest bill flowed from a change made to a different year's numbers, one Abena and Yvette had not been closely involved in at the time. In plain terms, a corporation is expected to pay tax in periodic instalments through the year based on an estimate of what it will owe, and if a prior year's reported income later changes, the instalment obligation calculated from that year can change with it, sometimes long after the fact and without anyone involved in the current year having done anything differently.

The amount itself was modest by the standards of a larger dispute, sitting under $15,000, but for a trust funding two members' modest household budgets, and for trustees who took their responsibility seriously despite having no professional background in it, the number felt disproportionate to what either of them understood the trust to have done wrong. Abena had read the letter three times before calling, trying to work out whether it described a new mistake, a penalty for something already fixed, or simply bad luck with timing, and could not settle on an answer before deciding it was safer to ask someone who could actually read it properly.

The complication

To check whether the recalculated instalment interest was even correct, someone needed to verify the prior year's reassessed figures against the corporation's original books for that year - the ledger, the receivables, the exact numbers the outside bookkeeper had used to prepare the original return before the CRA adjusted it. That bookkeeper, Winston, had retired the year before the letter arrived and was no longer working with the family or, as it turned out, with anyone. He had wound down his practice quietly, and neither Abena nor Yvette had kept a working relationship with him beyond the occasional holiday message.

Winston, however, was the only person who held the original working papers for that prior year - the schedules showing how the corporation's reported income had been calculated before the CRA's reassessment changed it. Without those papers, there was no way to confirm whether the CRA's reassessment of the prior year, and the instalment interest recalculation that flowed from it, had used the right starting figures. The corporation's own copies from that period were incomplete; a hard drive failure a couple of years earlier had taken a chunk of digital records with it, and what remained on paper was partial.

This put the trust in an unusual position. The dispute itself was not complicated in legal terms - instalment interest is charged on the shortfall between what the corporation actually paid and the lowest of the calculation options the rules permit, one of which is built on the prior year's tax base, and if that base was wrong, the interest calculated from it could be wrong too. But confirming whether it was wrong depended entirely on a document controlled by someone with no stake in the outcome and no ongoing obligation to help. Winston was retired, not a party to the dispute, and under no formal duty to respond to requests from trustees he had not worked with in over a year.

Locating him, and persuading him to dig out records from a closed practice for a matter that no longer paid him anything, became the real obstacle standing between the trust and a resolution - a bigger practical challenge, in some ways, than the substance of the tax question itself. Yvette had tried once, on her own, to reach Winston through an old email address, but the message bounced, and without a working number or a current address there was little more either trustee could do on their own before the CRA's response deadline arrived.

What we did

  1. Requested the CRA's full recalculation worksheet showing exactly how the prior year's reassessment had changed the instalment base, rather than accepting the new instalment interest figure as given, because the CRA had calculated this particular instalment interest using the prior-year option, and any error in that base would carry straight through to the final number - a request for the worksheet cost nothing while a wrong assumption about it could have cost the trust the full amount.
  2. Compared the CRA's reassessed prior-year figures against every surviving corporate record, including the partial paper files and what could be recovered from the damaged digital records, and found gaps large enough that neither side of the comparison could be confirmed without the missing working papers, which made clear early on that the file could not be resolved from the corporation's own documents alone.
  3. Located Winston through the professional body he had been registered with, tracking down a forwarding contact after the corporation's own records turned up nothing current and the email address Yvette had tried was no longer active, since he was the only source for the original schedules that could settle the question either way. Retired professionals often remain listed with a licensing or membership body years after winding down a practice, which made that registry the logical next place to check once the corporation's own contacts had run out.
  4. Explained the situation to Winston directly and asked for his cooperation, framing the request narrowly around the one prior year in dispute rather than his entire archive, which made it a reasonable and limited ask of someone with no ongoing stake in the corporation or obligation to assist. Keeping the request specific and easy to fulfil mattered, since a broad ask for an entire retired practice's records would have been far easier for Winston to decline.
  5. Reviewed the recovered working papers against the CRA's reassessment once Winston located and provided them, and found that the CRA's reassessment of the prior year had used an incorrect opening balance, one that did not match the figures Winston's own contemporaneous schedules showed had been reported. That single discrepancy was the root of everything that followed, since the instalment interest recalculation had simply carried the wrong opening figure forward without anyone re-checking it against the original books.
  6. Prepared a submission to the CRA laying out the discrepancy with Winston's original working papers attached as supporting documentation, requesting correction of both the underlying prior-year reassessment and the instalment interest that had been calculated from it. Addressing both figures in one submission mattered, since fixing the prior year's balance without also flagging the dependent interest charge could have left the second error standing even after the first was corrected.
  7. Followed up to confirm the correction flowed through properly, checking that the revised instalment interest calculation used the corrected base figure rather than assuming the CRA's system would apply the fix automatically across both the original reassessment and the dependent interest charge, since a correction to one figure does not always propagate cleanly to every downstream calculation without someone confirming it.

The outcome

The CRA confirmed that the prior year's reassessment had indeed used an incorrect opening balance, and corrected it based on the working papers Winston provided. Once the prior year's figures were fixed, the instalment interest calculated from that base no longer had a foundation to stand on, and the CRA reversed the instalment interest charge in full. The trust owed nothing further on the matter.

The result depended entirely on documentation that, for a period, neither Abena nor Yvette knew still existed anywhere. Had Winston not kept his old working papers, or had he been unreachable or unwilling to help, the trust would likely have faced a much harder choice: pay an amount that may well have been wrong, or spend more on professional fees trying to prove it than the disputed sum itself, given how small the underlying amount was.

For Abena, the experience changed how the trust handles its records now. The corporation has since moved to a system where working papers and supporting schedules are kept by the trust itself, not solely by whoever happens to be preparing the return in a given year, so that no future correction depends on tracking down someone who has long since moved on from the file. Winston, for his part, was glad in the end to help once he understood what was at stake, and the family sent him a card thanking him for digging a dusty box of files out of storage for a corporation he had not thought about in over a year. Abena still keeps the letter that started the whole matter, if only as a reminder of how close the trust came to paying an amount it never actually owed.

What you can learn from this

  • Instalment interest is charged on the shortfall against the lowest of several permitted calculation options, including one built on the prior year's tax base; if that prior-year figure was wrong, correcting it can fix the interest that flowed from it, but showing what the current year's tax actually turned out to be can answer the same question.
  • Trustees managing a family trust's corporate holdings should not assume the corporation's own files are complete - ask whoever prepared past returns to keep or share their working papers.
  • A dispute's real obstacle is sometimes practical, not legal - locating and persuading a former advisor with no ongoing stake to help can matter more than the underlying tax question.
  • Keep working papers and supporting schedules with the entity itself, not only with whichever bookkeeper or accountant happens to be engaged that year, so records survive a change in advisors.
  • Even a modest dispute, under $15,000, is worth pursuing properly when the underlying calculation may be wrong; the size of the amount does not determine whether it is owed.
This case study is entirely fictional. It does not describe any real client, file, or matter handled by Treadstone Law, and it is not a real file with details changed. All names, people, properties, businesses, dollar amounts, dates, and events are invented, and any resemblance to a real person, business, or situation is coincidental. Fictional scenarios like this one illustrate the kinds of legal issues people in Ontario commonly face and how a lawyer can help. They are general information, not legal advice — no two matters unfold the same way, and nothing here predicts the outcome of any real case. Reading a case study does not create a lawyer-client relationship. If you are facing something similar, speak with a lawyer about your specific circumstances.

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