Rebuilding Five Years of Crypto Records After a CRA Letter

The situation

Chantal retired from paramedic work a few years ago after a long career, and like a lot of retirees looking for something to do with both her time and her savings, she started trading cryptocurrency. What began as a small position on one exchange grew into a habit spread across four different platforms over roughly five years — she moved funds between them chasing better trading fees, tried a couple of platforms that later shut down entirely, and at one point held coins directly in a personal wallet for almost a year rather than on any exchange at all. Her spouse Arman, an IT support lead, helped her set up wallets and understood the mechanics of the technology, but neither of them thought of the trading as a business or tracked it as one. Chantal kept no spreadsheet, no running log of cost basis, and no record of which trades were swaps between coins rather than cash-outs.

The letter arrived on a Tuesday: a request for information from the Canada Revenue Agency, opening a review of her tax filings for the previous several years, specifically her cryptocurrency activity. The CRA has been receiving transaction data directly from Canadian exchanges for several years now, and the letter made clear the agency already had records showing substantial trading volume on Chantal's accounts — volume that did not appear anywhere on the tax returns she had filed. She had assumed, as many people do, that because she had not converted her crypto back to Canadian dollars and pulled it into her bank account, there was nothing yet to report. That assumption was the root of the problem.

What the review found

Under the Income Tax Act, disposing of cryptocurrency is a taxable event, and "disposing" is a broader concept than most people expect. It includes selling crypto for Canadian dollars, but it also includes trading one cryptocurrency for another, using crypto to pay for goods or services, and in some circumstances gifting it. Chantal had done all of the first two repeatedly — swapping one coin for another as she rebalanced her holdings — and each swap was, in the CRA's eyes, a separate disposition requiring her to calculate a gain or loss at that moment, even though no cash ever touched her bank account.

Two further questions sat underneath the reporting gap, and they mattered enormously to how much tax she would ultimately owe. The first was whether her trading counted as investment activity, where only half of any gain is taxable as a capital gain, or as business activity, where the full gain is taxable as income. The CRA looks at frequency of trading, the trader's intention, the time spent on it and whether the person has specialized knowledge, among other factors, and a retiree trading actively across four exchanges for five years does not sit comfortably on the investment side of that line. The CRA's initial position treated the bulk of her activity as business income.

The second question was cost basis — what she had originally paid for each coin she later disposed of, which determines the size of any gain. Without records, the CRA is not obligated to give a taxpayer the benefit of the doubt. Left unaddressed, the review was heading toward a reassessment that would treat a large share of Chantal's gross trading proceeds as taxable income with minimal offsetting cost basis, plus interest accruing from each original filing deadline and a penalty for failing to report income. The amount the CRA proposed to add to her taxable income across the review period put her total exposure, including tax, interest and penalties, in the neighbourhood of $140,000.

What we did

1. Pulled full transaction histories from all four exchanges. Two of the platforms Chantal had used were still operating and produced complete downloadable transaction logs once she requested them. The other two had shut down or been acquired years earlier, which meant tracking down archived data through account recovery requests and, in one case, relying on partial records Chantal had saved by chance in old email confirmations.
2. Reconstructed the wallet-held period using blockchain data. For the roughly ten months Chantal held coins in a personal wallet rather than on an exchange, we worked with a bookkeeper experienced in crypto reconciliation to trace the wallet's public transaction history and match it against the exchange records on either side, establishing what went in, what came out, and when.
3. Calculated cost basis using a consistent, defensible method. Canadian tax rules require using an adjusted cost base approach, averaging the cost of identical property rather than tracking specific coins individually. We applied that method consistently across the full five-year period rather than letting the CRA's working assumptions stand by default, which meaningfully reduced the taxable gain on several of the larger swaps.
4. Argued the trading was investment activity, not a business, for the earlier years. We reviewed Chantal's actual trading pattern year by year and found her activity had been sporadic and exploratory for the first two years before becoming more frequent later on. We submitted evidence — trade counts, holding periods, and the absence of any specialized trading strategy or leverage — supporting capital treatment for the earlier, lower-volume years and conceding business treatment only for the later period where the pattern genuinely supported it.
5. Filed amended returns for the affected years rather than simply responding to the CRA's figures. Once the reconstructed records and cost basis calculations were complete, we prepared and filed corrected returns reflecting the actual trading history, giving the CRA a complete and defensible alternative to its own reconstruction rather than leaving Chantal only able to dispute the agency's numbers.
6. Requested penalty relief through the CRA's voluntary disclosures process for the portion of the history that qualified. Because Chantal had not previously been contacted about the earliest years under review, part of her disclosure met the conditions for relief from the failure-to-report penalty and a portion of the interest, and we submitted that request alongside the amended returns.

The outcome

The reconstructed records and the corrected cost basis calculations made a real difference. The CRA's original proposed adjustment, built on gross proceeds with little offsetting basis, would have added roughly $140,000 in tax, interest and penalties to Chantal's account. Once her actual cost basis was established and the earlier low-volume years were accepted as capital gains rather than business income, the CRA's revised assessment brought her total liability down to approximately $68,000 in additional tax and interest. The voluntary disclosure request succeeded for the earliest year under review, eliminating the penalty on that portion, though penalties remained on the later years where the CRA maintained, and the evidence largely supported, that Chantal had been trading as a business by then.

That final figure was a genuine improvement — roughly half of what the CRA first proposed — but it was still a real bill, and Chantal still owed it. Rebuilding the records did not make the underlying tax disappear; cryptocurrency dispositions she had made over five years were real events that created real gains, and no amount of documentation changes that. What the reconstruction did was ensure she was taxed on what actually happened rather than on the CRA's worst-case reading of incomplete third-party data, and it converted a chunk of her liability from business income taxed in full to capital gains taxed at half the rate. Chantal arranged a payment plan directly with the CRA to cover the remaining amount over time, and she and Arman began keeping a running transaction log for any trading going forward, so that no future year would ever again require reconstructing five years of history after the fact.

What you can learn from this