ETF Return of Capital and ACB: How T3 Distributions Affect Your Cost Base
Return of capital is not taxed when received. Instead, it reduces your ETF adjusted cost base, which means ignoring it pushes your reported gain too low when you eventually sell.
What return of capital is
Return of capital (ROC) is a distribution that gives you back part of your original investment rather than paying current-year income. It is common in Canadian ETFs that distribute more cash than they earned as income in the period.
Why it matters for ACB
If your ETF ACB starts at $10,000 and you receive $500 of ROC over several years, your real ACB becomes $9,500. That lower ACB increases your capital gain when you sell. Ignoring ROC makes your gain too small and can trigger a reassessment.
Where to find your ROC amounts
ROC details are often found in ETF provider tax factor sheets, CDS Innovations data, or supplemental T3 materials. Your broker statement may show the cash distribution but not clearly separate return of capital from other components. Box 42 on a T3 is a capital gains amount, not ROC.
Current limitation in ActiveACB
ActiveACB does not yet automatically apply ETF ROC adjustments. That limitation is already disclosed in the methodology page. The current workaround is to reduce the ACB manually using the Raw Trades XLSX re-import workflow. This is on the product roadmap.
If the ETF also had reinvestment or repurchase activity near a loss sale, review the superficial loss rule guide separately, because reinvestments can affect the replacement-share analysis.
Frequently asked questions
If ROC reduces my ACB, can my ACB go below zero?
No. Once ACB reaches zero, any additional ROC is generally a capital gain in that year rather than a negative ACB balance carried forward.
Does ROC affect reinvested capital gains distributions too?
No. Reinvested capital gains distributions usually increase ACB, while ROC decreases it. They are different adjustments and should not be merged together.
My ETF pays monthly distributions. Do I need to adjust my ACB every month?
You only adjust for the portion of each distribution that is actually ROC. The cash frequency does not matter as much as the annual tax breakdown published by the fund.
Where do I enter the manual ACB correction in ActiveACB?
Download the Raw Trades XLSX from your calculation history, adjust the relevant rows to reflect the reduced ACB, and upload the corrected file as a new calculation.