When to Bring In an Accountant When Buying a Business in Ontario

A common mistake in a first-time business purchase is treating the accountant as someone you'll call once there are final numbers to file — closer to closing, or even after. By then, several of the decisions an accountant is best placed to influence have often already been made.

The honest answer to "when do I need an accountant" is: earlier than you think, and alongside your lawyer rather than after them. Here's what that looks like at each stage.

Before You Make an Offer

Before you've committed to a price, an accountant can help you make sense of the financial statements you've been shown — whether the numbers reflect the actual, ongoing health of the business or are shaped by one-time events, related-party arrangements, or accounting choices that flatter the picture. This is also the stage to start thinking, even informally, about whether you're more likely to pursue an asset purchase or a share purchase, since that choice affects almost everything that follows.

During Due Diligence

Once you're under a letter of intent, your accountant's role expands into detailed financial due diligence: verifying the financial statements against underlying records, reviewing tax filings and compliance history, and flagging anything — an undisclosed liability, an inconsistent revenue pattern, an unresolved tax matter — that should feed into your lawyer's representations, warranties, and indemnities, or into the price itself.

Structuring the Deal: Asset vs Share, and the Tax Consequences

This is where an accountant's input is often decisive. An asset purchase and a share purchase carry materially different tax consequences for both sides:

• In a share purchase, an individual seller may be able to shelter capital gains on qualifying small business corporation shares using the Lifetime Capital Gains Exemption — a benefit that does not apply directly to a corporation's own sale of its assets. Whether a particular seller's shares actually qualify depends on tests that are fact-specific and require dedicated tax advice.
• In an asset purchase, GST/HST generally applies to most business assets, though the parties can sometimes jointly elect under the Excise Tax Act to have no GST/HST apply on a qualifying sale of a business or part of a business. A share sale, by contrast, is generally treated as exempt from GST/HST altogether.
• Where an asset sale includes real property, Ontario land transfer tax applies to the value attributed to that real property, separate from the GST/HST treatment of everything else.

Your accountant works through which structure — or which price allocation within a structure — actually makes financial sense for your specific circumstances, while your lawyer builds that structure into the purchase agreement.

At Closing

By closing, your accountant should have reviewed the final purchase price allocation among the assets being acquired (in an asset purchase), confirmed the tax elections being made, and sanity-checked the working-capital adjustment mechanism against the seller's closing financial statement.

After Closing

The accountant relationship typically continues after closing — filing any required elections, integrating the acquired business into your existing books if applicable, and advising on how funds are eventually extracted or reinvested, which carries its own separate tax consequences from the purchase itself.

Quick Reference: What Your Accountant Covers at Each Stage

Frequently asked questions