One Room, Two Practices, and a Reassessment That Denied Both

The situation

The reassessment letter that reached Adaeze did not ask a single question first. It denied the home office claim outright, across three tax years at once, for both her practice and Trevor's, and set out a balance owing that ran into six figures once interest was added. There had been no earlier request for clarification, no letter asking how the space was used or how the split between them had been calculated. The file simply moved straight to denial, the kind of opening move that tends to work because most taxpayers respond to it by panicking rather than by asking what the actual basis for it was.

Adaeze ran a chiropractic practice out of a small clinic a short drive from their house, but she did a meaningful share of billing, scheduling, and continuing education work from a converted bedroom at home, particularly in the evenings after the clinic closed. Trevor, a veterinarian with his own small practice, used the same room during the day on the two days a week he did not see patients directly, handling lab result reviews, supplier orders, and administrative work that did not require him to be at the clinic itself. Both had claimed a portion of the home office expenses tied to that one room, on the reasonable basis that they used it at different times for different, legitimate parts of their respective practices.

The house itself was not in either of their names. It belonged to a family trust that Trevor's brother Emeka had served as trustee of since their parents transferred the property into it years earlier for estate-planning reasons, with Adaeze and Trevor living there under an informal arrangement with the trust rather than owning it outright. Neither of them had thought that detail mattered to a home office claim until the reassessment made ownership itself part of the question, since a deduction tied to a space generally depends on the person claiming it actually bearing the cost of that space, not simply living in it.

The auditor assigned to the file took the position early and said so plainly: two self-employed professionals could not both claim expenses tied to the same physical space, and the file would be treated as if one of the two claims was simply invalid unless the couple could prove otherwise to a standard the reviewer described, more than once, as one the agency had ample time and resources to keep testing. It was not a threat exactly, but it was not subtle either. The comment came up again when Adaeze asked how long the review might take, and again when she proposed an initial meeting to walk through their schedules.

Adaeze and Trevor were confident their arrangement was legitimate. What they did not have, going in, was anything beyond their own word that the room had genuinely been used by each of them, at different times, for real work tied to their respective practices rather than as a convenient joint claim on the same square footage.

The complication

The difficulty was not that the couple's story was implausible. It was that a shared room, used at overlapping but not identical times by two different self-employed people, does not fit neatly into the kind of straightforward square-footage calculation the home office rules are usually applied with. A single professional claiming a dedicated room can generally point to the room's share of the home's total space and their percentage of work-related use within it. Two professionals sharing that same room need to show something more: that their respective uses of the space were genuinely separate, not overlapping claims on the same hours, and that the total percentage claimed between them did not effectively double-count the room.

Reviewing the couple's original claim, the underlying math had actually been done reasonably, apportioning the room's costs between the two practices based on rough estimates of hours used each week. The problem was that rough estimate was exactly what it sounded like: an honest but retrospective guess, not something either of them had contemporaneously tracked. Adaeze's evening hours and Trevor's two office days a week were real patterns, but neither had kept a log, a calendar entry, or anything else that would let an outside reviewer verify the split rather than simply take their word for it.

The reviewer's position leaned hard on that gap. Without contemporaneous evidence, the audit treated the entire claim with suspicion, reasoning that two professionals conveniently splitting one room in proportions that happened to work out favourably for both of them was, at minimum, a claim that needed real substantiation before the agency would accept any of it. The comments about the agency's resources and time were meant, we came to understand over the following weeks, to discourage a costly and drawn-out fight over what might otherwise have been resolved with better documentation from the outset.

The couple's income put real money behind the dispute. Between the two practices and three years of denied claims, the total exposure sat in the range of a few hundred thousand dollars, high enough that simply conceding the reassessment to avoid a longer fight was not a comfortable option, but also high enough that an extended, resource-intensive dispute against an agency that had made clear it was prepared to take its time was not something the couple wanted to commit to lightly either.

The trust ownership added a second thread to untangle alongside the room split. The reviewer's file raised, almost in passing, whether Adaeze and Trevor were even the right people to be claiming costs tied to a house neither of them held title to, since the trust technically owned the property and covered its major carrying costs. That question was answerable, but it meant the file could not rest solely on scheduling evidence; it also needed to show, separately, that the specific costs being claimed, utilities and a portion of the trust's carrying costs the couple reimbursed monthly, were genuinely paid by Adaeze and Trevor themselves rather than absorbed by the trust on their behalf.

What we did

We started by rebuilding, as best the record allowed, the evidence the couple had not thought to keep in real time. Trevor's clinic scheduling system showed which two days a week he was consistently absent from the practice, a pattern that lined up with his claimed home office days across all three years in question, and we pulled that data directly from the practice's own records rather than relying on his recollection of a schedule from years earlier. Adaeze's clinic had similar scheduling records showing her patient hours ended consistently in the mid-afternoon, supporting the pattern of evening administrative work at home that her claim depended on, rather than leaving that pattern as something only she could vouch for.

We supplemented that scheduling evidence with financial records that were harder to dispute: continuing education receipts timestamped to evening hours, supplier order confirmations for Trevor's practice sent from the home address during his claimed office days, and email timestamps for both of them that corroborated when each was actually working from the room rather than at their respective clinics. None of this had been assembled at the time it was created; pulling it together after the fact from three years of email accounts and supplier portals took real effort on both their parts, but it converted an unverifiable estimate into a documented pattern with independent support behind every part of it.

Rather than defending the couple's original percentage split as precisely correct, we proposed a revised, more conservative split based directly on the corroborated scheduling data, which produced a somewhat lower combined claim than the original but one that the reviewer's review could actually verify against real, independently sourced records rather than take on faith. We walked through the calculation line by line in a written submission, showing exactly how each hour claimed traced back to a specific record, rather than leaving the reviewer to reconstruct the logic on their own from a spreadsheet with no supporting narrative attached. We also addressed the double-counting concern directly and explicitly, showing month by month that the two claimed usage windows did not meaningfully overlap and that the combined percentage across both practices stayed within a defensible total share of the room's overall use.

Throughout, we kept the file moving on a set schedule of our own rather than letting it drift on the agency's own timeline, following up in writing at regular intervals and declining to let vague comments about how long a review could take substitute for an actual, substantive response to the evidence we had submitted. When the reviewer's team raised further questions about specific weeks or transactions, we answered them promptly and with specific supporting documents, denying the review the extended, attrition-based pace that had been signalled, not so subtly, at the very start of the file.

The outcome

The agency accepted the revised, corroborated split, and the bulk of the original claim was restored across all three years, though at the somewhat more conservative percentages the scheduling evidence actually supported rather than the couple's original rough estimate. The final adjustment reduced Adaeze and Trevor's combined tax owing substantially from the reassessment's initial position, though it did not restore the full amount either of them had originally claimed, and interest continued to accrue on the smaller balance that remained through the months the review itself had taken to resolve.

A portion of the claim, tied to a handful of months early in the period where the couple's own records were thinnest and the corroborating evidence simply did not exist to be found, could not be fully substantiated and was conceded rather than fought. That conceded portion accounted for a modest fraction of the total dispute, a fair trade given how much stronger the couple's position became once the rest of the claim rested on verifiable records rather than memory and rough estimation.

The comments about the agency's time and resources, which had rattled Adaeze badly at the outset and coloured how she approached every subsequent call, turned out to matter less once the file had real documentation sitting behind it. A reviewer with unlimited time still has to respond to evidence that actually answers the question being asked, and cannot simply extend a review indefinitely once the taxpayer's side has closed the factual gaps the review was built on. The lesson the couple took from the file, more than the final dollar figure, was how differently the review had gone once their claim stopped depending on the agency simply believing two professionals' account of how they used one shared room, and started depending on records that did not need to be believed at all because they could be checked.

What you can learn from this