Finding the ACB of inherited shares

When inherited shares arrive in a brokerage account, the displayed book value may not explain how their tax cost was established. The deceased person’s original purchase price, the value at death, and the value on the eventual transfer date can all be different. For inherited shares in Canada, identify the tax treatment and supporting estate records before entering an opening ACB.

This guide concerns securities held as capital property and received into a taxable account. Registered-plan beneficiary payments, non-resident estates, and complex trusts require separate analysis. The aim is to assemble a reliable starting record, not to infer an estate’s tax choices from an account screen.

Start with the estate’s treatment

The general rule is a deemed disposition of capital property at fair market value immediately before death. A corresponding acquisition-cost rule applies to property acquired as a consequence of death. However, qualifying transfers to a spouse, common-law partner, or qualifying spousal trust can receive rollover treatment. That can preserve the earlier cost rather than reset it to market value.

Ask the executor or estate representative which treatment applied to the specific shares. Request the valuation date, number of shares, Canadian-dollar tax cost, and any relevant election or rollover information. An account statement showing the shares were received is useful evidence of delivery, but it may not answer those tax questions.

Do not assume that every beneficiary starts with either zero cost or the deceased’s historical cost. Both shortcuts can produce a materially wrong gain on the beneficiary’s later sale. Equally, do not assume that “inherited” always means an uncomplicated reset at the transfer-day market value.

Distinguish death from estate distribution

An estate can hold securities for months before distributing them. During that period it may receive distributions, reinvest cash, sell part of a position, or acquire more shares. Those events can affect what is eventually delivered and the cost information that should accompany it.

Where property is distributed through a trust or estate, section 107 and the applicable estate treatment may matter. Request a distribution statement identifying the tax cost carried to you. If the estate sold the original investment and purchased another one, the new purchase history matters; the original date-of-death value is not a universal answer for the replacement property.

Separate three dates in your worksheet: the date of death, the date the estate acquired or adjusted the position, and the date you received it. Explain which date supports the valuation and which supports the account movement. That distinction makes later questions much easier to resolve.

Worked example with a documented starting cost

Assume an estate confirms that 200 shares pass to an adult child with supported tax cost of $10,000. The deceased originally paid $6,000, and the ordinary date-of-death treatment established $10,000 as the relevant cost. Assume the estate had no intervening transactions or cost adjustments and confirms the same amount on distribution.

The beneficiary records 200 shares with total ACB of $10,000, or $50 per share. If the shares are worth $11,000 when delivered, that display value does not automatically replace the estate-confirmed cost.

Later, the beneficiary sells 80 shares for $4,800 and pays a $10 commission. Allocated ACB is 80 × $50 = $4,000, giving a capital gain of $790. The remaining 120 shares have total ACB of $6,000.

If the beneficiary had incorrectly used the deceased’s $6,000 original cost, the same sale would deduct only $2,400 and show a $2,390 gain. The $1,600 difference comes from an incorrect starting record, not a complicated sale formula. The ACB calculation guide helps check the later arithmetic once the acquisition cost is established.

Pool inherited shares with existing holdings

Suppose the beneficiary already owned 100 identical shares with total ACB of $4,000. Adding the inherited 200 shares at the confirmed $10,000 cost produces a pool of 300 shares and $14,000 total ACB. The average is $46.6666667 per share.

A subsequent sale uses that pooled cost, rather than selecting only the inherited shares or only the earlier purchases. Account labels and inheritance notes should remain in the evidence file, but they do not create separate tax lots for identical property under the same taxable ownership.

Use the multi-brokerage pooling guide if the inherited position lands at a different institution. Check that the security really is identical: similar company names, different share classes, and successor securities should not be combined merely because their tickers resemble each other.

Common mistakes with estate transfers

A transfer-date price can be mistaken for tax cost because it is the first number visible in the recipient’s account. Ask what that number represents before relying on it. An institution may be displaying market value, transferred book value, or a manually supplied opening amount.

Another mistake is assuming a spousal rollover occurred without asking about the estate’s election. A qualifying estate may choose different treatment for particular property. Keep the representative’s confirmation rather than reverse-engineering a choice from what seems tax-efficient after the event.

Also look for missing distributions. If the estate held an ETF across year-end, return-of-capital or reinvested-distribution information may arrive after the initial transfer statement. Ask whether the delivered tax cost is final and whether an amended statement is expected. Keep later corrections linked to the original acquisition record. If estate records are incomplete, follow the workflow for reconstructing lost purchase records .

Build an inheritance evidence package

Keep the estate distribution statement, share quantities, tax-cost confirmation, valuation method, currency conversion support, and relevant correspondence. A short cover note should identify the estate, recipient, security, and the person who supplied the cost figure. Store private estate documents securely; they need not be embedded in a public or shared worksheet.

For foreign-currency securities, request the Canadian-dollar cost or enough information to verify its conversion. Do not convert a supported historical CAD value again at the delivery-date rate. Preserve both the source valuation and the resulting ledger amount.

If the estate cannot supply a clear cost, pause the final calculation and seek professional help with the estate records. Once confirmed, retain the evidence with the holding throughout ownership and the subsequent reporting period. Inheritance is an acquisition event worth documenting carefully once, so every future sale can start from the same supported record.