Introduction

The sale of an incorporated business — a medical practice, a dental office, a technology company, a construction firm — often produces the largest single sum of money the owner will ever receive. After years of building wealth through the corporation and deferring personal tax, the question of what to do with the proceeds is one that deserves as much planning as the sale itself.

The Immediate Tax Picture

Depending on how the sale was structured, the proceeds arrive in different forms:

Share sale — personal capital gain: The seller receives the purchase price personally. After applying the Lifetime Capital Gains Exemption (if available), the remaining gain is included in income at the capital gains inclusion rate. The tax is due in the year of disposition. For a significant sale, this is the year of the highest personal income tax liability the seller will ever face.

Asset sale — corporate proceeds followed by distribution: The corporation receives the purchase price. Corporate taxes are paid on the gains. The remaining proceeds are distributed — partially tax-free via the capital dividend account, partially as eligible or non-eligible dividends.

Mixed proceeds: Some sales involve a mix of upfront proceeds, earnout payments over time, and vendor take-back arrangements. Each component is taxed separately in the year it is received (or, for certain earnout structures, in the year it becomes determinable).

Step 1: Do Not Rush to Invest

The week after closing a significant business sale is not the moment to make permanent capital allocation decisions. The immediate priority is to confirm the tax liability, ensure liquidity to pay it, and avoid irreversible investment decisions made under the novelty of sudden liquidity.

The tax owing on a large capital gain is due April 30 of the year following the sale year (or June 15 if self-employed, but the tax is still due April 30). For a sale that closes in September, the tax is owed approximately seven months later. Liquidity must be preserved for that payment.

Step 2: Maximise Tax-Free Distributions From the Corporation

Before the corporation is wound up (if it is being wound up — it may not be, if residual assets remain), ensure all available capital dividend account amounts have been distributed. This is the final opportunity to use the CDA balance to move money from the corporation to the shareholder tax-free.

The RDTOH balance should also be drawn down through appropriate dividend payments that trigger the maximum refund.

Step 3: Understand the New Personal Tax Landscape

Before the sale, the business owner's income may have been primarily managed through corporate compensation at controlled rates. After the sale, the income picture changes:

RRSP and RRIF: The accumulated RRSP is now beginning its drawdown phase. The timing of conversions and withdrawals affects marginal rates for the next twenty-plus years.

CPP and OAS: These begin at specified ages; deferring both maximises lifetime benefits but requires other income sources in the interim.

Investment income: A large non-registered investment portfolio generates interest, dividends, and capital gains that are fully personal income.

Corporate holdco: If a holdco remains active, it continues to generate passive income and requires ongoing T2 filing and tax management.

The management of these multiple income sources in retirement is a different planning challenge from operating a business — and one that benefits from the same deliberate approach.

Step 4: Build a Formal Retirement Income Plan

For most business sale proceeds that exceed $2–3 million, working with both a CPA (for tax) and a financial advisor (for investment and income planning) to build a formal retirement income plan is worthwhile. The plan should model:

Annual after-tax income needs in retirement

Optimal RRSP/RRIF drawdown schedule by year

Integration of CPP and OAS with other income sources

Tax on corporate holdco income and optimal dividend strategy from holdco

Estate planning implications of the accumulated wealth

Step 5: OAS Clawback Planning

High-investment-income retirees are often surprised by the Old Age Security clawback. For 2026, OAS benefits begin to be clawed back at net income of approximately $90,997, with full clawback at approximately $148,179. A retired business owner drawing large RRIF payments, corporate dividends from a holdco, and capital gains can easily exceed these thresholds — resulting in full OAS clawback and an effective marginal rate above 60% at certain income levels.

Managing net income through the retirement years — by timing RRIF withdrawals, using capital dividends where available, and splitting income with a spouse — can preserve OAS benefits worth $8,000–$10,000 annually.

When to Speak With a CPA

Ideally, this planning conversation begins in the year before the sale — not the year after. Post-sale, the immediate priorities are tax payment liquidity, CDA distributions, and the transition to a retirement income model.

Rotaru CPA works with business owners through the sale and into post-sale tax and income planning. Book a consultation to begin the transition planning conversation.