An unreported gain from a crystallisation years earlier, found in diligence for a different sale

The situation

Six years before the sale under diligence, the vendor had crystallised a portion of the lifetime capital gains exemption through an internal, related-party transfer of shares — a common pre-emptive step, done while the exemption was clearly available and before any sale was imminent, to lock in the exempt amount and step up the adjusted cost base of the shares held afterward. The crystallisation itself was a legitimate, common structure. Its tax treatment depended on the exemption being properly claimed on the return for that year.

The accountant who prepared that year’s return changed firms partway through the engagement, and the return was filed nineteen months after the filing-due date — a fact that sat quietly in the file for six years, unremarked because no reassessment had ever been issued and the vendor had never been audited.

The problem

s.110.6(6) denies the exemption on a specific capital gain where two conditions are both met. First, conduct: “the individual knowingly or under circumstances amounting to gross negligence” either fails to file the return within one year of the filing-due date, or fails to report the gain at all. Second, “the Minister establishes the facts justifying the denial of such an amount under this section.” A late-filed return, on its own, is not automatically caught — the one-year grace period in subparagraph (a)(i) means a return filed even eleven months late is outside the provision’s reach on that ground alone. Nineteen months is not.

The current buyer’s tax counsel, reviewing six years of the vendor’s personal and corporate filing history as a matter of routine diligence, flagged the crystallisation year’s late filing and asked whether the exemption claimed on that year’s return had ever been challenged. It had not — because the CRA had never looked. Diligence had found what an audit had not.

The numbers

The crystallisation gain was $525,000, fully sheltered by the exemption on the return as filed. Once the late-filing fact was raised and the vendor’s advisors assessed the exposure, they concluded the position could not be defended on the merits — there was no dispute about whether the return was late, only about whether the lateness was knowing or grossly negligent, and the change of accountant mid-engagement did not supply an innocent explanation for a nineteen-month delay. The current sale, unrelated in substance, priced in $525,000 of contingent liability plus interest running from the original filing-due date.

The rule that decided it

Read the unit carefully: s.110.6(6) denies the deduction “in respect of a capital gain of an individual for a particular taxation year…for the particular taxation year or any subsequent year” — it is keyed to that gain, in the year it arose, not to every future disposition the individual ever makes. The provision does not poison the exemption on an unrelated later sale; it removes the exemption specifically from the gain that was not properly reported, whenever anyone tries to claim it. That is exactly what happened here: the current sale’s own gain was never in question. The crystallisation gain, six years old, was the one exposed.

Nor does s.110.6(6) reverse the crystallisation transaction itself. The related-party transfer happened, the adjusted cost base of the shares held afterward was stepped up by the amount of the exemption claimed, and none of that unwinds. What is denied is the deduction that was supposed to make the gain on that transfer tax-free — leaving a real tax liability sitting behind a transaction everyone had treated as closed.

The outcome

The vendor’s advisors filed a voluntary disclosure on the crystallisation year, accepting the exposure rather than waiting for a CRA-initiated reassessment, on the view that a disclosure made before any CRA contact carried better relief-from-penalty prospects than one made after. The current sale closed with the $525,000 contingent liability, plus estimated interest, held back in escrow pending resolution of the disclosure rather than indemnified on an open-ended basis.

What it would have cost otherwise

Closing without addressing the exposure would have left the buyer’s counsel unable to close the file on the vendor’s personal tax representations, since the disclosure obligation and its consequences were now known facts rather than a theoretical risk. An escrow the parties can quantify is a workable closing condition; an open-ended personal-tax indemnity on a fact already discovered in diligence generally is not.

The tell

The tell was the filing date itself, sitting in a return six years old that nobody had reason to open until a different sale’s diligence process asked for the vendor’s full filing history rather than just the years immediately relevant to the transaction at hand.

Takeaways

• • s.110.6(6) requires knowing or grossly negligent non-reporting or late filing beyond the one-year grace period, plus the Minister establishing the facts — it is a conduct test, not a strict-liability one.
• • The denial attaches to the specific gain that was mishandled, in the year it arose — it does not automatically bar the exemption on an unrelated later disposition.
• • A denial under s.110.6(6) does not reverse the underlying transaction or its adjusted-cost-base consequences; it removes the shelter, leaving the transaction’s tax cost exposed.
• • Diligence on a current sale routinely reads years of unrelated filing history — an old crystallisation with a late-filed return is exactly the kind of fact that surfaces there rather than in an audit.

Sources

• • Income Tax Act s.110.6(6) — denial of the exemption for a capital gain not reported, or reported after a knowing or grossly negligent late filing beyond the one-year grace period.
• • Treadstone Law — common ways to lose the capital gains exemption — general background on how the exemption is lost. It does not address the specific late-filing conduct test in s.110.6(6); the statutory text above is the operative rule.