Adjusted Cost Base & Capital Improvements: How Good Records Cut Your Tax When You Sell a Rental or Cottage
The same renovation counted as a "capital improvement" raises your cost base and cuts your capital gains tax; counted as a "repair," it’s just a deduction that year. Over 20 years, whether you kept the receipts decides how much tax you pay at sale.
Why should I understand ACB and capital improvements before selling a rental or cottage?
Because it directly decides how much tax you pay. Your Adjusted Cost Base (ACB) = purchase price + acquisition costs (legal fees, land transfer tax, commissions) + the cost of capital improvements over the years. Capital gain = proceeds − ACB − selling costs, so every documented capital improvement raises your ACB, shrinks the gain, and lowers the tax. The key is telling apart a capital improvement (lasting or betterment benefit — a whole new roof, an addition, a new furnace) from a current expense (restores to original condition — a patch, a repaint): the first goes into ACB, the second is deducted that year. Source: CRA (2026).
Sources: CRA (canada.ca: Definitions for capital gains / Current or capital expenses / T4037, 2026)
I’m Arthur Zhao. Many clients hear the term ACB for the first time when they sell a rental or cottage — then kick themselves for not keeping the old renovation receipts, because those receipts could have saved them tens of thousands in tax. Here’s what ACB is, which spending counts as a “capital improvement” that goes into your cost base, which is just a deductible repair, and one trap people miss: if you claimed CCA depreciation, it gets “recaptured” when you sell. Note: dollar examples here are illustrative, not CRA figures — for a specific situation, see an accountant.
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What ACB actually includes
Capital improvement vs current expense: the core line
💡 The distinction matters both ways: a current expense is deducted in full against rental income this year (T776); a capital expense is not immediately deductible — it either gets added to your ACB (lowering the capital gain at sale) or is depreciated over time via Capital Cost Allowance (CCA). So tracking capital improvements is exactly what protects you at sale: a higher ACB = a smaller gain = less tax. Source: CRA (2026).
Inclusion rate confirmed at 50% for 2026
⚠️The most common — and expensive — mistake: not keeping receipts. Without proof of capital improvements, CRA can disallow the ACB addition and tax a larger gain. Over a 20-year hold, lost renovation receipts directly inflate the taxable gain. Keep them for the ownership period + 6 years after the sale.
Principal residence vs rental/cottage, and the CCA recapture trap
A property that qualifies for the Principal Residence Exemption (PRE) generally has its gain fully exempt, so tracking improvements matters far less (though since 2016 you must still report the sale on Schedule 3 + T2091). A rental or cottage (a second/recreational property) is taxable — exactly where diligent ACB tracking saves real tax. The trap: if you claimed CCA depreciation on a rental, selling above the building’s undepreciated capital cost (UCC) triggers recapture — the previously-deducted CCA is added back to income in the sale year, taxed as ordinary income (not at the 50% capital-gains rate). That’s why many rental owners choose not to claim CCA. Source: CRA (T4037, 2026).
Frequently Asked Questions
What exactly can I add to my property’s ACB?
Your purchase price, plus acquisition costs (legal fees, land transfer tax, commissions), plus the cost of capital improvements and additions over the years — a new roof, an addition, a new furnace/HVAC, a finished basement, new concrete steps replacing rotting wood. You can’t add current expenses like routine repairs or repainting. Source: CRA (2026).
A new roof — repair or improvement?
It depends. Replacing the entire roof (a lasting, betterment benefit) is a capital improvement → added to ACB or claimed via CCA; patching or re-shingling a leaking section to restore the roof to its original condition is a current expense → deducted this year. Sources: CRA / TurboTax Canada (2024).
Is the capital gains inclusion rate still 50% in 2026?
Yes. The 2024 proposal to raise it to two-thirds was deferred, then cancelled on March 21, 2025, and never became law. Half of your gain is taxable and added to your income. Source: Government of Canada / CRA (2025).
Do I need this if I’m selling my main home?
Usually not for tax owing — the Principal Residence Exemption generally shelters the gain. But you must still report the sale on Schedule 3 and Form T2091 (required since 2016). For a rental or cottage the gain is taxable, so tracking every capital improvement genuinely lowers your tax. Source: CRA (T2091IND).
I claimed depreciation (CCA) on my rental — does that affect the sale?
Yes. If you sell for more than the building’s undepreciated capital cost, the CCA you deducted is recaptured and added back to your income in the sale year — taxed as ordinary income, not at the 50% capital-gains rate. This is why many rental owners choose not to claim CCA. Source: CRA (T4037).
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · GUILD Elite
VP & Branch Manager, Bay Street Group Inc.
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