Anonymised, illustrative composite. Two provisions that are each simple on their own, and an interaction that is invisible from either.
At a glance
A vendor sold the shares of a specialty distribution business for $2,600,000: $1,500,000 in cash at closing and a $1,100,000 vendor take-back note repayable in four equal annual instalments. The shares were qualified small business corporation shares, and the vendor’s accountant structured the return to claim a capital gains reserve on the deferred portion under s.40(1)(a)(iii) — standard practice where proceeds are collected over several years — alongside the lifetime capital gains exemption on the recognised gain in the year of sale.
Both mechanisms are individually unremarkable. A reserve defers recognition of a gain to match when the cash is actually received; the exemption shelters a capital gain on qualifying shares. The accountant’s model ran them side by side across four years, assuming each year’s exemption claim would simply track that year’s recognised gain.
The model missed a rule that only bites once a reserve amount actually comes into income in a later year. s.110.6(31) provides that where an amount is included in income “because of subparagraph 40(1)(a)(ii) in respect of a disposition of property in a preceding taxation year” that was, at the time of disposition, a qualified small business corporation share, “the total of all amounts deductible by the individual for the particular year under this section is reduced by the amount, if any, determined by the formula” comparing what was actually deductible against what would have been deductible had no reserve ever been claimed.
In Year 3, the second note instalment came into income under s.40(1)(a)(ii). The exemption available for that year was smaller than the recognised gain, and the accountant’s original four-year model — which had not run the s.110.6(31) comparison at all — was wrong for that year by the difference.
The recognised gain in Year 3 was $275,000, the pro-rata share of the deferred $1,100,000 attributable to that instalment. The vendor’s remaining exemption room, on the accountant’s original model, was assumed sufficient to shelter the entire amount. The s.110.6(31) comparison reduced the deductible amount for Year 3 by $61,000 relative to that model — not because the vendor’s cumulative gains limit had run out, but because the formula measures whether the reserve strategy produced access to more total exemption across the four years than immediate recognition of the whole $1,100,000 in the year of sale would have allowed, and in this case it had.
s.110.6(31) exists to stop a reserve from being used as a second lever on top of the exemption — not to prevent the two mechanisms coexisting, but to prevent the timing choice inherent in a reserve from expanding the total exemption available beyond what recognising the whole gain in the year of sale would have produced. The provision is titled, in the marginal note, simply “Reserve limit,” and it operates by comparing two totals: what was actually deducted across the years in question, against what would have been deductible had the individual “not for any preceding taxation year claimed a reserve under subparagraph 40(1)(a)(iii)” and had instead recognised the gain on the ordinary schedule.
Read the unit. The rule is not asking whether the vendor is entitled to the exemption on the Year 3 gain in isolation — on its own that gain plainly qualifies. It is asking whether the combination of the reserve and the exemption, across every year touched by the same disposition, produced more sheltered gain than immediate recognition would have. The comparison runs across the whole sequence of years, which is why it is invisible from any single year’s return read on its own, and why a model built year by year, without projecting the comparison forward, will miss it.
The $61,000 difference between the model and the actual Year 3 deduction became fully taxable income for that year, at a point when the vendor had already spent the closing proceeds against the original after-tax projection. The remaining note instalments were re-modelled with the s.110.6(31) comparison built in, which reduced but did not eliminate the exemption available on the final two years’ recognised amounts.
Had the reserve not been used at all — the whole $1,100,000 recognised and the exemption claimed once, in the year of sale — the total tax outcome across the four years would have been close to what s.110.6(31) ultimately forced: the rule is designed to make the reserve tax-neutral relative to immediate recognition, not to punish it. The real cost here was the surprise, not the tax itself: a Year 3 tax bill the vendor had not budgeted for, on cash already spent.
The tell was in the modelling method: a spreadsheet that projected each year’s reserve inclusion and each year’s exemption claim independently, without ever comparing the running total against the no-reserve alternative the statute itself uses as the benchmark.
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