Anonymised, illustrative composite. A tenant challenged a common area maintenance charge as unsupported. The dispute turned on whether the landlord still had the paperwork — and by law, it had to.
At a glance
A small commercial plaza in Nova Scotia, leased to several tenants under gross leases with a common area maintenance (CAM) recovery clause, issued its annual CAM reconciliation. One tenant, occupying 8% of the plaza’s leasable area, disputed a $3,280 line item as unsupported.
The disputed charge was the tenant’s pro-rata share of a parking lot resurfacing project completed three years earlier. The tenant’s position was straightforward: produce the invoice this charge is based on, or remove it from the reconciliation. The landlord’s bookkeeping had changed accounting systems twice since the resurfacing job, and nobody could immediately confirm the paperwork still existed.
The resurfacing project had cost $41,000 in total. At the tenant’s 8% pro-rata share of leasable area, $41,000 × 8% is exactly $3,280 — the figure the tenant was disputing. If the invoice could not be produced, the landlord had no basis to defend the charge; if it could, the arithmetic matched precisely.
The reason the invoice was still findable at all was not luck. The Income Tax Act requires every person carrying on a business to keep records and books of account at the person's place of business or residence in Canada, and retain them — under section 230(4)(b) — until six years from the end of the last taxation year to which they relate. Three years after the resurfacing job, the landlord was still well inside that statutory retention window, whatever its internal accounting system had changed in the meantime.
That statutory floor is what made the invoice retrievable rather than merely hoped-for: the landlord was not relying on good habits, it was operating under a legal minimum that required the record to still exist. Once retrieved, the invoice and the pro-rata math resolved the dispute without argument.
The landlord produced the original $41,000 invoice, the pro-rata calculation checked out to the dollar, and the tenant withdrew its dispute. The plaza's management company subsequently indexed CAM-supporting invoices by year and by capital project, specifically so a similar request would not depend on remembering which accounting system a given year's records lived in.
For the adjacent discipline of getting lease terms themselves into a reviewable form, see how lease abstraction with AI works and what records CRA expects from a contractor.
Had the landlord's accounting system change actually cost the resurfacing invoice — not merely made it briefly hard to find — the $3,280 charge would have had no supporting document at all, and the dispute would have succeeded by default: no invoice, no basis to defend the line item, full removal from that tenant's reconciliation and, likely, every other tenant's reconciliation carrying a share of the same $41,000 project. A tenant at twice this one's pro-rata share (16% instead of 8%) would have been disputing $6,560 on the identical missing invoice.
The real defence here was retention discipline visible only when tested — check whether your own capital-project invoices are findable by year and project today, not whether your accounting system has changed since the work was done. A record technically inside its six-year window that takes days to locate is functionally as weak as a record that no longer exists, if a dispute has a shorter fuse than your filing system.
The invoice technically sat inside the Income Tax Act's six-year window the entire time, but it still took the bookkeeper six business days to actually locate it across two changed accounting systems — long enough that the tenant's own patience had nearly run out before the document surfaced. A record inside its statutory retention period is not the same thing as a record that is quickly findable, and a dispute rarely waits for the slower of the two. The plaza's new indexing system, organized by year and by capital project rather than by whichever accounting platform happened to be in use when the work was done, is built specifically to close that six-day gap the next time a tenant disputes a CAM line item tied to older capital work.
The same $41,000 resurfacing invoice underwrote every tenant's CAM share of that project, not just this one's — which means the six-day retrieval delay and the six-year retention floor behind it were not really about one $3,280 dispute. Had the invoice genuinely been lost, every tenant's share of that same line item would have been equally undefendable, all traceable to the identical missing document. Organizing capital-project records by project rather than by tenant dispute is what turns a single retrieval into protection for every reconciliation the invoice ever supports, not just the one that happened to get challenged first.
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