ETF Return of Capital and Adjusted Cost Base

Return of capital (ROC) is one of the more easily missed adjustments in Canadian ETF recordkeeping. It generally is not taxed as income when distributed. Instead, it reduces the adjusted cost base of the investment, which can increase a later capital gain or reduce a later capital loss.

The basic calculation is simple when the unit balance never changes. The difficult cases involve T3 Box 42, monthly distributions, DRIPs, partial sales and issuer tax data published after year-end.

Written and researched by myCostBase. Last reviewed: September 2, 2026. This article was checked against current CRA and ETF-issuer sources listed below. The educational guidance and calculations are usable without the product.

What return of capital is

Return of capital generally represents a distribution in excess of the fund’s earnings. For Canadian tax purposes, it reduces the ACB of the units rather than being included immediately as interest, dividends or a capital-gain distribution.

ROC is common in some covered-call ETFs, balanced or income-oriented funds, REIT funds, closed-end funds and trusts. A fund’s cash distribution should not be assumed to be all income or all ROC. Its tax character may include several components and is often finalized after year-end.

ROC is tax-deferred, not tax-free. A lower ACB generally produces a larger capital gain—or a smaller capital loss—when the units are sold. If ROC would reduce ACB below zero, the excess is treated as a capital gain in that year.

A simple ROC example

You buy 1,000 units of a Canadian ETF at $20.00 per unit. Total ACB is $20,000.

During the year, the ETF pays distributions. After year-end, the fund’s tax information shows that $0.10 per unit of the amount distributed to these units was ROC.

ROC adjustment: 1,000 × $0.10 = $100.00
New total ACB: $20,000 − $100 = $19,900
New ACB per unit: $19,900 ÷ 1,000 = $19.90

If the same adjustment were missed for 10 years while the unit balance stayed unchanged, the recorded ACB would be $1,000 too high. A later capital gain would then be understated by $1,000.

What T3 Box 42 represents

T3 Box 42 is labelled “Amount resulting in cost base adjustment.” It should not be treated as a synonym for ROC in every case.

CRA’s guidance for mutual fund trusts says:

a positive Box 42 amount generally reduces ACB;
a negative Box 42 amount generally increases ACB;
if a reduction would make ACB negative, the excess becomes a capital gain and ACB is reset to zero.

Your T3 slip may show only aggregate amounts. The accompanying T3 details or supplemental statement may be needed to identify the amount belonging to a particular ETF. Keep that detail with the ACB ledger.

Cash distributions, DRIPs and non-cash distributions

These are separate events and should be recorded separately.

Cash distribution: Cash is paid to the investor. Its tax character may include dividends, interest, capital gains, ROC or other income.
DRIP purchase: Cash that would otherwise have been paid is used to buy additional units. The purchase generally adds the reinvested amount to ACB and increases the unit balance.
ROC component: The ROC portion separately reduces ACB, even if the overall cash distribution was reinvested through a DRIP.
Reinvested or non-cash distribution: The fund allocates a taxable amount and reinvests or retains it, often consolidating the units afterward. The taxable reinvested amount generally increases ACB so it is not taxed again as a capital gain later.

A DRIP does not necessarily reinvest only the “non-ROC portion.” The purchase and the ROC reduction are two ledger entries with different effects.

Which distribution amounts affect ACB?

Item	Typical ACB treatment
Positive T3 Box 42 cost-base adjustment	Reduces ACB
Negative T3 Box 42 cost-base adjustment	Increases ACB
Reinvested or non-cash taxable distribution	Increases ACB
DRIP purchase	Increases ACB and unit count
Eligible or non-eligible dividend paid in cash	No direct ACB change
Interest or other income paid in cash	No direct ACB change
Capital-gain distribution paid in cash	No direct ACB change; reported as income
ROC after ACB has reached zero	Excess is a capital gain; ACB remains zero

This table describes the usual ACB entry. The same distribution can create taxable income, a DRIP purchase and a cost-base adjustment that must be recorded separately.

Use the T3 amount or issuer per-unit factors—do not mix them

Two valid information paths are commonly available:

Information available	How to use it
A detailed T3 statement identifies the aggregate Box 42 amount for the specific fund holding	Apply that positive or negative aggregate amount directly to the correct ACB pool. Do not divide it by one year-end or record-date balance merely to multiply it back again.
You are reconstructing the adjustment from issuer per-unit tax factors	For each relevant distribution, multiply the factor by the units entitled on that distribution’s record date, then add the results.
Both are available	Reconcile them. Investigate a difference caused by transfers, changing balances, multiple accounts or incomplete detail rather than forcing the figures to match.

An annual aggregate per-unit factor is safe only when it is intended to be applied that way and the same units were entitled to every included distribution. It can be wrong when units were purchased, sold or added through DRIP during the year.

Record date, payment date and tax-character date

These dates answer different questions:

Record date: Determines which investors and how many units are entitled to the distribution.
Payment date: The date cash or reinvested units are delivered.
Tax-character publication date: Often after year-end, when the issuer publishes how the distribution is allocated among income, capital gains, ROC and other components.

Preserve the issuer’s record and payment dates even if the final ACB adjustment is entered later. If units changed during the year, do not apply an annual amount to the year-end balance. Reconstruct the adjustment using the units entitled to each distribution, and keep the final tax-character source with the ledger.

Worked example: DRIP, partial sale and changing unit balances

Assume the issuer’s final tax information assigns ROC to two distributions:

Starting position: 500 units with total ACB of $10,000.
January record date: ROC factor is $0.05 per unit. Adjustment is 500 × $0.05 = $25.00. ACB becomes $9,975.00.
February DRIP: $102.00 buys 5 units at $20.40. The position becomes 505 units and total ACB becomes $10,077.00.
June sale: 200 units are sold before the second ROC record date. Exact ACB removed is $10,077 × 200 ÷ 505 = $3,990.89. The remaining 305 units have ACB of $6,086.11.
September record date: ROC factor is $0.08 per unit. Only the remaining 305 units are entitled. Adjustment is 305 × $0.08 = $24.40.
Ending position: 305 units with total ACB of $6,061.71, or about $19.8745 per unit.

The total ROC adjustment for this holding is $25.00 + $24.40 = $49.40. The detailed T3 statement and issuer calculation should reconcile to that amount.

The key point is that the September factor does not apply to the 200 units already sold. Applying an annual factor to the year-end balance—or to the original 500 units—would produce the wrong adjustment.

What happens when ACB reaches zero

If cumulative positive cost-base adjustments reduce ACB to zero, any further reduction creates a capital gain in that year. CRA currently directs individuals to report the amount on Schedule 3 line 13200 and enter zero on line 13199 because no actual sale occurred. The ACB is reset to zero.

This can occur with a long-held fund that has distributed substantial ROC. Continue maintaining the ledger after ACB reaches zero; future purchases add to ACB, while later reductions must again be tested against the zero floor.

Why broker book value can differ

A missing ROC reduction can make broker book cost higher than the investor’s adjusted ACB. That is only one possible explanation.

Some brokerages apply annual ROC and reinvested-distribution adjustments after receiving final tax factors. Wealthsimple says it posts those adjustments retroactively, generally in May. Questrade says its BK book-cost field includes return of capital and reinvested dividends.

When a broker figure and an independent ledger differ:

check whether the final annual adjustment has been posted;
compare the T3 detail with the issuer tax-character information;
verify transferred holdings and units at each record date;
check reinvested distributions, DRIPs and partial sales;
document the remaining difference instead of assuming either figure is automatically correct.

For the broader comparison, see Broker Book Value vs Adjusted Cost Base. For a sale-level check, use the T5008 ACB reconciliation checker.

Finding issuer tax-character information

ETF issuers typically publish annual distribution tax information after year-end. Look for a fund’s distribution history, annual tax breakdown, tax factors or non-cash distribution notice.

Useful primary-source starting points include:

Use issuer data for the fund-level tax factors. Use the broker’s detailed T3 statement for the investor-specific amounts reported, and reconcile the two when needed.

What if an adjustment was missed?

For a position still held, reconstruct the ledger chronologically from the earliest missing year. Include purchases, DRIPs, reinvested distributions, ROC, sales, transfers and other adjustments before calculating the current ACB.

If a missed adjustment affected a disposition already reported on a tax return, recalculate the return before deciding what must be changed. CRA generally accepts requests to change returns for the ten previous calendar years, subject to its rules and limitations. A material historical correction is worth reviewing with a qualified tax professional.

Do not automatically file a change solely because an old ROC amount was found. First determine whether it changed a filed gain, loss or deemed gain and whether the complete corrected calculation is supportable.

For the complete pre-filing workflow, see the Canadian Adjusted Cost Base Checklist. For DRIP purchases, see DRIP and Adjusted Cost Base.

Sources and calculation notes

Calculations above retain full precision until the displayed dollar amount. ETF issuers and brokerages can revise documentation, so verify the current fund and account records for the tax year being reviewed. Corrections can be reported through the myCostBase contact page.

The application recalculates ACB when you record ROC, DRIP and reinvested-distribution adjustments; it does not replace the issuer tax information or the investor’s supporting documents. Create a free account →

General information only — not tax, legal, or financial advice. Consult a qualified professional for advice specific to your situation.

ETF Return of Capital and Adjusted Cost Base in Canada