Allocating ACB after a spin-off

A spin-off can leave your account showing shares in two companies where yesterday there was one. The new shares may arrive with no book value , a market value, or a broker-supplied allocation. None of those displays alone establishes the Canadian tax treatment. Before changing adjusted cost base, identify the transaction and the rules that apply to you.

This workflow explains how to document a supported allocation and check its arithmetic. It does not assume every spin-off is tax-deferred. myCostBase does not automate complex spin-offs; the product limits guide explains the manual-review boundary.

Obtain the Canadian tax materials

Start with the issuer’s investor-relations announcement, arrangement documents, and Canadian shareholder tax discussion. Record the effective date, old and new share identifiers, distribution ratio, and any cash component. A U.S. tax-basis notice may be relevant evidence, but it is not automatically the Canadian answer.

Identify whether the event is a domestic reorganization, a foreign share distribution, a return of capital, or another type of transaction. The applicable provisions can differ. Domestic arrangements can involve rules such as section 86 and corporate-level provisions such as section 55; neither is a universal instruction to split an individual’s ACB by a published percentage.

If the materials offer a worked allocation, check its assumptions. It may apply only to certain holders, elections, or valuation dates. Keep the full document and the page explaining the method, rather than a percentage copied from a discussion forum.

Foreign spin-offs have a specific election framework

For certain eligible foreign spin-offs, section 86.1 provides an election that can exclude an otherwise taxable foreign share distribution from income and allocate the existing cost between the original and distributed shares. Eligibility and making the election are separate requirements.

Check CRA’s eligible-spin-off information and the issuer’s Canadian guidance. A transaction appearing on an eligibility list does not mean that every shareholder’s election has been filed. Conversely, the absence of a transaction from a published list is a reason to investigate with the issuer, not to invent a tax result.

Without an applicable deferral, the distribution can have a different income and acquisition-cost treatment. Get advice about the filing requirements, deadline, and your circumstances before treating the distribution as a simple cost transfer. The bookkeeping should follow the established treatment, not determine it.

Worked example of a confirmed allocation

Assume a qualified reviewer has confirmed that an allocation is appropriate and that the supported method assigns 80% of existing cost to Parent and 20% to SpinCo. You own 100 Parent shares with total ACB of $5,000 and receive 25 SpinCo shares. There are no other holdings, fees, fractional shares, or cash payments in this example.

The allocation is:

The total cost remains $5,000. Parent’s cost decreases by $1,000, and SpinCo receives that same amount. The 25 new shares do not create another $5,000 of cost. Equally, the spin-off distribution ratio of one new share for four old shares does not, by itself, establish a 20% tax-cost allocation.

If you later sell 10 SpinCo shares for $500 with a $5 commission, the allocated cost is $400 and the capital gain is $95. The remaining SpinCo holding has $600 ACB. Check that sale against the worked examples in the ACB calculation guide after establishing the supported opening cost.

Record manual adjustments with a shared reference

First preserve the pre-event ledger: share count, total ACB, and any pending distributions. Then record the supported reduction in Parent’s ACB and the acquisition of SpinCo with the corresponding cost. Use the effective date and transaction types supported by your ledger, and attach the same event reference to both entries.

The application does not decide which election or allocation is appropriate. If the available entry fields cannot express the event faithfully, ask for support or keep a reviewed external schedule rather than forcing it into an ordinary cash purchase. A manual entry should explain a real tax event, not merely make the displayed total look plausible.

After entry, compare both share quantities with the broker’s statement and reconcile the combined cost with the approved schedule. If you already owned SpinCo shares, add the new acquisition to that security’s existing taxable pool. The new block does not remain a separately selectable lot for a later sale.

Handle cash and fractions separately

A spin-off may generate a fractional entitlement that is sold for cash. Record the quantity disposed of, proceeds, expenses, and the cost allocated to that fraction. Do not discard the cash because it is small, and do not allocate all of SpinCo’s cost to the remaining whole shares without reviewing the fraction.

Other cash components can represent different tax events. A payment described as cash consideration, a dividend, or return of capital should be matched to the issuer’s explanation. Preserve the broker’s line items instead of combining everything into a single adjustment.

Foreign-currency amounts also need documented Canadian-dollar treatment. Keep the rate source and date used for each relevant valuation or transaction. An allocation between securities and a currency conversion are separate steps, even when they appear in the same worksheet.

Common mistakes and evidence to retain

Avoid copying a U.S. allocation into a Canadian ledger without checking applicability. Avoid interpreting a zero-cost broker entry as proof that the new shares have no ACB. Avoid entering the spin-off twice when a later CSV import repeats a manual adjustment you already made.

Your evidence package should include issuer materials, eligibility and election support where relevant, valuation inputs, the allocation worksheet, and before-and-after ledger snapshots. Note who reviewed any uncertain treatment and which assumptions the example or calculation uses.

For a later sale, the allocation should be traceable without reconstructing the entire corporate event. Link the new security’s opening entry back to the original holding and preserve any amendments. The ACB recordkeeping checklist provides a broader filing structure for keeping those calculations and source documents together.