How far ahead should I plan a business sale for tax?

Owners routinely call an accountant once a buyer is at the table. By then most of the tax planning that matters is already fixed. Canadian tax rules for business sales are built around historical tests — what the company owned, who held the shares, and for how long. You cannot retroactively change history, so the value of planning drops sharply as closing approaches.

Three years out: the full toolkit is open

With a three-year runway you can purify the corporation gradually, spreading any tax cost over several years instead of taking it in one hit. You can complete an estate freeze and bring family members or a family trust in as shareholders, which may multiply access to the lifetime capital gains exemption where the conditions are met. You can clean up the share register, settle shareholder loans, and resolve any historical filing problems. You can also start improving the things a buyer will diligence, which is a value exercise as much as a tax one.

Two years out: the look-back clock

Twenty-four months is the recurring number in the qualified small business corporation rules — both the broader asset test and the holding-period test measure the period immediately before the sale. Starting at the two-year mark means any change you make can, if maintained, satisfy those windows. Starting later means at least some of the window is already spent under the old facts.

Twelve months or less: structure, not transformation

• Negotiating a share sale rather than an asset sale, where the buyer will accept it.
• Allocating the purchase price across asset classes in an asset deal, within what is defensible.
• Spreading proceeds using a vendor take-back or an earn-out, which can affect the timing of tax.
• Choosing the closing date, which determines the tax year the gain falls into.
• Making available elections, such as the joint election that can relieve GST/HST on a sale of a business as a going concern.

Planning is not only about the exemption

Lead time also lets you fix problems that reduce price rather than increase tax: unsigned contracts, unclear ownership of intellectual property, undocumented related-party arrangements, unfiled returns, and employee classification issues. Buyers price uncertainty into their offers or hold money back for it. Time spent early usually shows up as both a lower tax bill and a cleaner deal.