One Shop, Two Businesses, One Set of Records Under Review

The situation

The number on the table when Sari first called was about seventy-five thousand dollars in disputed income, with the potential for the total exposure to climb past a hundred thousand once penalties and interest were counted, depending on how a records dispute at her old shop played out. She was calling from several provinces away, having moved out west the year before for a new position, and she needed the whole matter handled without setting foot back in Ontario if that was at all possible.

For years, Sari had run a small HVAC servicing operation out of a rented commercial unit in Caledon, splitting the space and some overhead with Anjali, who ran a separate but related HVAC business from the same premises. The arrangement had been informal — shared storage, a shared front counter, sometimes shared subcontractors for larger jobs — and it had worked well enough until Sari and Anjali's business partnership dissolved partway through the year in question, around the same time their personal relationship also ended.

The split was not friendly, and neither Sari nor Anjali had done much to formally separate their records before Sari relocated. Invoices, supplier accounts, and job files for both businesses had been kept in overlapping filing systems for years, and untangling exactly whose income belonged to which business, for the specific stretch of months before the split, was already going to be difficult even without an audit forcing the question.

Then the audit notice arrived, addressed to Sari's business, proposing to review records at the Caledon premises directly. Anjali still operated out of that same unit with her new partner, Prakash, and the notice as drafted did not distinguish between the two businesses' storage areas or filing systems — it proposed access to the premises generally, which meant an auditor walking in could plausibly review anything on site, including records that had nothing to do with Sari's business at all.

The legal question

The central legal question was how far an auditor's right to access a business premises actually extends when that premises is shared between two legally separate businesses. Tax authorities generally have broad powers to inspect the books, records, and premises of a business under review, and a taxpayer cannot simply bar the door. But that power attaches to the business being audited — it does not automatically extend to a co-tenant's unrelated operation just because the two share a physical space.

Here, the difficulty was that the shared arrangement made the line between the two businesses genuinely blurry on paper, even though it was clear in practice. Filing cabinets held both businesses' invoices interleaved by date rather than by entity. The front counter and phone line had, for a period, served both operations. An auditor walking into that unit without a carefully scoped access agreement could reasonably claim that almost anything in reach was fair game, simply because it was hard to tell at a glance which business a given folder belonged to.

Anjali, understandably, did not want her post-split business exposed to scrutiny triggered by her former partner's audit, and she had no independent reason to cooperate with an access arrangement that risked pulling her own current records into someone else's file. Prakash, running the business alongside her, felt the same. That left the practical problem of negotiating access to a shared space in a way that satisfied the auditor's legitimate need to review Sari's records without giving them a claim to review Anjali and Prakash's.

Compounding the difficulty was distance. Sari could not be on site to walk the auditor through the space, point out which cabinet belonged to which business, or negotiate boundaries in person as questions came up. Every clarification, every boundary line, had to be established in advance, in writing, and communicated to whoever would actually be present when the audit visit happened — a much less forgiving way to manage a dispute that, handled in person, might have resolved itself with a walk-through and a conversation. Every decision that would normally happen on the spot instead had to be anticipated, drafted, and sent ahead of time, with no easy way to adjust once the auditor was actually standing in the shop.

What we did

1. Mapped which records belonged to which business, working from Sari's memory and whatever documentation she still had. Before any access negotiation could happen, we needed our own clear picture of the boundary between the two businesses' records, even an imperfect one, so we were not negotiating blind against an auditor who had never seen the space and had no reason on their own to draw the line carefully. That map became the reference point for every boundary we proposed afterward.
2. Contacted Anjali's own representative to coordinate rather than leaving two audiences guessing. Given the personal history between Sari and Anjali, we treated this as a practical logistics problem rather than a continuation of their dispute, proposing a joint approach to access that protected both businesses without requiring either side to trust the other personally, since a fractured, uncoordinated response from two separate parties would have handed the auditor an easy reason to treat the whole space as fair game.
3. Proposed a written access protocol before any site visit was scheduled. Rather than letting an auditor arrive and improvise, we sent a proposed scope in advance — specific filing cabinets, specific years, specific categories of documents — designed to give the auditor everything legitimately relevant to Sari's business while walling off Anjali's current operation, so the boundary existed on paper before anyone was standing in the room having to invent one on the spot.
4. Arranged for someone independent to be present during the site visit in Sari's place. Since Sari could not attend from out of province, we retained a local representative to walk the premises with the auditor, apply the agreed boundaries in real time, and flag anything that fell outside the protocol before it was reviewed rather than after, which meant Sari's interests were represented on site even though she never could be.
5. Pushed back in writing when the initial visit ran past the agreed scope. The auditor's first visit did touch on some records closer to the boundary line than the protocol allowed; we raised this immediately and in writing rather than letting an informal overreach become the accepted practice for future visits, which kept every subsequent visit anchored to the original written terms instead of a gradually expanding informal understanding.
6. Reconstructed Sari's own income and expense picture independently, to control the substantive numbers. Because some records genuinely were commingled, we built Sari's financial picture from bank deposits, supplier invoices we could clearly attribute to her business, and client contracts, rather than relying entirely on the shared filing system to speak for itself, giving us a defensible figure to argue from instead of accepting whatever the auditor's own reconstruction assumed.
7. Negotiated the final assessed amount once access and records questions had settled. With the scope dispute resolved and Sari's own numbers independently supported, we argued down the portion of the auditor's proposed adjustment that rested on assumptions rather than clearly attributable records, which brought the final figure closer to what the actual evidence supported rather than what the commingled files implied.

The outcome

This was not a case with a clean win to report, and Sari knew that going in given how tangled the records genuinely were. The audit concluded with additional tax assessed on a portion of income the auditor determined had not been properly reported during the months before the business split, a result driven largely by the commingled records that made a fully clean reconstruction impossible after the fact. The final figure landed closer to the lower end of the amount originally at risk, but it was still a real cost, not a vindication, and Sari paid it along with a modest amount of interest that had accrued while the access and records questions were being worked out.

What the access protocol did accomplish was keeping Anjali and Prakash's current business entirely out of the file. No records from their post-split operation were reviewed, cited, or drawn into Sari's assessment, which mattered both practically and personally given how the split had gone. The boundary held, even under the pressure of an informal overreach during the first site visit, because that overreach had been flagged and corrected immediately rather than allowed to become the pattern for the rest of the audit.

Sari's main reflection afterward was about the years of shared, informal recordkeeping rather than the audit itself — the assessment, she said, was the bill for years of convenience that never got cleaned up before it mattered. Managing the file entirely at a distance added friction at every step, from scheduling to the site visit itself, but it did not prevent the outcome from being contained to what the underlying facts actually supported, rather than expanding to swallow a business that was never under review in the first place and had no reason to be caught up in someone else's file.

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