Introduction

The sale of a Canadian corporation is often the most significant financial event in a business owner's professional life. It is also one of the most complex from a tax standpoint — involving rules that have been accruing consequences (good and bad) throughout the corporation's existence.

For incorporated professionals and business owners who anticipate selling their corporation at some point, understanding the tax framework well in advance is not optional. The most valuable tax provisions available on a sale — particularly the lifetime capital gains exemption — have qualifying conditions that need to be met in the years before the sale, not just at the moment of closing.

The Two Ways to Sell a Business

A business can be sold in two structurally different ways: as a share sale or an asset sale.

In a share sale, the buyer purchases the shares of the corporation. The seller receives proceeds for their shares, and the underlying assets and liabilities of the business transfer with the corporation. The tax consequences on a share sale are generally determined at the shareholder level — the gain on the shares is the primary tax event.

In an asset sale, the corporation sells individual assets — equipment, client contracts, goodwill, inventory — to the buyer. The corporation receives the proceeds, which are then taxed at the corporate level. The shareholder then faces a second level of tax when distributing those proceeds personally.

A share sale is generally preferred by sellers for tax reasons. An asset sale is often preferred by buyers, who want to avoid assuming unknown liabilities. The negotiation between these two positions is a common feature of small business transactions.

The Lifetime Capital Gains Exemption (LCGE)

The lifetime capital gains exemption (LCGE) is one of the most significant tax incentives in the Canadian tax system. In 2026, the LCGE allows an individual to shelter a substantial amount of capital gains on the sale of qualifying small business corporation shares from income tax. The exemption limit is adjusted for inflation and should be verified with a CPA for the applicable year.

To be clear: the LCGE applies to the individual shareholder, not the corporation. It is the shareholder who claims the exemption against their capital gain on the sale of qualifying shares.

Qualifying Small Business Corporation (QSBC) Rules

Not every private corporation's shares qualify for the LCGE. The shares must be shares of a qualifying small business corporation (QSBC) at the time of sale, which requires meeting several conditions:

The active asset test: At the time of sale, 90% or more of the fair market value of the corporation's assets must be attributable to assets used principally in an active business carried on primarily in Canada.

The 24-month holding period test: The shares must have been owned by the individual (or a related person) throughout the 24 months immediately before the sale.

The 50% active asset test over the prior 24 months: Throughout the 24 months before the sale, more than 50% of the fair market value of the corporation's assets must have been used principally in an active business.

The 90% active asset test is the most commonly problematic. A corporation with significant passive assets — cash, investments, or a holdco structure with investment portfolios — may fail this test at the time of sale. This is why the composition of corporate assets in the years leading up to a sale matters so much.

Surplus Stripping and the Purification Problem

A corporation that has accumulated significant retained earnings in passive assets may need to be "purified" before a sale — meaning the passive assets need to be removed from the corporation to meet the QSBC active asset test.

Purification strategies may include paying dividends to shareholders, repaying shareholder loans, or using corporate funds to pay down business liabilities. Each of these has its own tax implications and timing requirements.

Purification is a planning exercise that should begin at least 24 months before the anticipated sale to satisfy the look-back test. Attempting to purify a corporation immediately before a sale may not achieve the desired result, and the CRA scrutinises last-minute restructuring.

Multiple Shareholders and the Multiplication of the LCGE

Where a corporation has multiple shareholders — family members, for example, or business partners — each eligible individual may be able to claim their own LCGE against their proportionate capital gain on the sale. This multiplication of the exemption is a legitimate and significant planning opportunity.

However, the rules around who qualifies as an eligible individual, and whether share structures designed to multiply the exemption will be accepted, are complex. The 2018 amendments to the tax on split income (TOSI) rules affect when capital gains from the sale of shares can be realised by family members at favourable rates. These rules require careful planning — ideally well in advance of any transaction.

The Role of the Capital Dividend Account

On a share sale, a portion of a capital gain may flow through the corporation's capital dividend account (CDA) if the corporation has a positive CDA balance. Capital dividends paid from the CDA are received tax-free by individual shareholders. Understanding the corporation's CDA balance — and how a sale transaction affects it — is part of pre-sale planning.

What the CRA Expects From a Sale Transaction

The CRA examines business sale transactions for compliance with the QSBC rules, for aggressive purification strategies, and for any arrangements designed to inappropriately multiply the LCGE or convert what would be ordinary income into capital gains. The GAAR (General Anti-Avoidance Rule) can apply to arrangements that are technically compliant but lack business purpose beyond tax reduction.

This is not a reason to avoid legitimate planning — it is a reason to ensure that the planning is well-documented, commercially grounded, and executed with professional advice.

When to Speak With a CPA

Pre-sale planning for a corporation should begin at least two to three years before an anticipated transaction. A CPA familiar with business sale transactions can review the corporation's asset composition, assess QSBC eligibility, model the tax consequences under different sale structures, and coordinate with the transaction lawyer on structuring.

Rotaru CPA works with incorporated professionals and business owners who are building toward an eventual sale. Book a consultation to understand where your corporation stands and what preparation looks like.