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What to Do If a Buyer Discovers Undisclosed Tax Debt During M&A Due Diligence in Ontario

13 Jun 2026 5 min read No comments Business & Commercial Law Ontario
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Discovering unremitted HST or payroll deductions during M&A due diligence is a massive red flag. The Canada Revenue Agency (CRA) has immense power to seize assets or hold buyers liable. Buyers should pause the deal, renegotiate the purchase price, or use a substantial escrow holdback to ensure the seller clears the debt before closing.

Acquiring a new business should be an exciting avenue for growth, but hidden financial skeletons can quickly turn a dream deal into a nightmare. During the Mergers and Acquisitions (M&A) process, the due diligence phase is where buyers meticulously examine the target company’s books. Unfortunately, it is not uncommon to discover that the seller has fallen behind on their obligations to the Canada Revenue Agency (CRA).

Whether you are buying a construction firm in London, an IT company in Toronto, or a logistics business in Mississauga, finding undisclosed tax debt-specifically uncollected Harmonized Sales Tax (HST) or unremitted payroll source deductions-requires immediate action. 📍 The CRA does not operate like a regular creditor; they hold “super priority” liens. This means they can seize the assets you just bought. This guide outlines the steps an Ontario buyer must take to protect their investment.

Step-by-Step Process for Handling Unremitted HST and Payroll Debt in Ontario

When you uncover a massive tax liability that the seller “forgot” to mention, you do not necessarily have to walk away from the deal. However, you must heavily insulate yourself from the CRA’s reach. Here is how corporate law firms generally handle this scenario.

Step 1: Perform Thorough Financial Due Diligence

The discovery phase is critical. A buyer’s accountant and legal team must review all recent tax filings, Notices of Assessment, and internal ledgers. You must ensure the seller provides a letter of authorization allowing your representatives to speak directly with the CRA to verify the exact balance of the corporate tax accounts.

In Ontario, unremitted payroll deductions (CPP, EI, and income tax) and unremitted HST are deemed to be held in trust for the Crown. The CRA can bypass standard bankruptcy proceedings and place a lien on the business assets. If you buy the assets without clearing this up, the CRA might take the equipment you just paid for.

Step 2: Quantify the Tax Liability and Pause the Deal

Once the debt is uncovered, hit the brakes on the transaction. You need to calculate the exact principal amount owed, plus any accrued interest and potential CRA penalties. Sellers often try to downplay the severity, claiming they will “pay it off with the proceeds of the sale.”

Type of Tax DebtRisk to Buyer in a Share SaleRisk to Buyer in an Asset Sale
Corporate Income TaxHigh (Buyer assumes the corporation and its debts).Low (Stays with the seller’s corporation).
Unremitted HSTHigh (Deemed trust claim).High (CRA can enforce a lien on the assets sold).
Payroll DeductionsHigh (Deemed trust claim).High (Super priority lien against assets).

Step 3: Renegotiate the Deal Structure and Escrow Holdbacks

If you still want to proceed, you must amend your purchase agreement. The most common solution is an escrow holdback. Under this arrangement, a portion of the purchase price is not given to the seller. Instead, the buyer’s lawyer holds the funds in trust. These funds are explicitly used to pay off the CRA immediately upon closing.

Alternatively, you might reduce the purchase price dollar-for-dollar based on the debt, though this is riskier in an asset sale due to CRA lien mechanics. Switching the structure from a Share Purchase to an Asset Purchase is also common, but as noted above, deemed trusts for HST and payroll still pose a serious risk to physical assets.

Step 4: Obtain Tax Clearance Certificates

To finalize your protection, your corporate lawyer should demand that the seller apply for a Section 116 Clearance Certificate (if dealing with non-resident sellers) or general CRA clearance letters. Furthermore, the seller must provide sworn statutory declarations on the closing date confirming that all HST and employee source deductions have been paid in full. If the seller lies on these documents, you have solid grounds for a fraud lawsuit in the Superior Court of Justice.

How Much Does it Cost to Fix in Ontario?

Addressing tax complications during an M&A transaction requires highly specialized professionals, which will increase your transaction costs. 💵 Typical expenses in CAD include:

  • Forensic Accounting Fees: Hiring a CPA to dig through messy ledgers to uncover the true tax debt usually costs between $3,000 and $10,000 CAD.
  • Legal Deal Restructuring: Having a law firm draft complex escrow agreements and indemnity clauses will add $2,500 to $7,500 CAD to your legal bill.
  • CRA Penalties: If the seller’s debt includes gross negligence penalties, the overall liability could be 50% higher than the original unremitted amount.

How Long Does the Process Take?

Discovering a tax issue will inevitably delay your closing date. Getting an accurate statement of account from the CRA can take 2 to 4 weeks depending on their current backlog. Negotiating an escrow holdback and drafting the new legal protections generally adds another 1 to 3 weeks to the due diligence timeline. Do not rush this process; closing a deal with outstanding CRA deemed trusts is incredibly dangerous.

Frequently Asked Questions (FAQ)

Can the CRA seize assets I bought from the seller?

Yes. Unremitted HST and payroll source deductions create a “deemed trust” in favour of the Crown. The CRA has a super priority lien, meaning they can legally seize the business equipment or inventory you purchased to satisfy the seller’s debt.

Is a share sale safe if the seller promises to pay the debt?

No. In a share sale, you are buying the entire legal entity, including all its past liabilities. A simple promise from the seller is not enough. You must use an escrow holdback to ensure the CRA is paid directly from the purchase funds.

Can the seller’s directors be held personally liable?

Yes. Under the Excise Tax Act and the Income Tax Act, corporate directors in Ontario can be held personally liable for unremitted HST and payroll deductions. This is why sellers are usually highly motivated to resolve the debt during the sale.

What is an escrow holdback in an M&A deal?

An escrow holdback is a legal arrangement where a portion of the purchase money is kept in a lawyer’s trust account rather than given to the seller. The money is only released once specific conditions are met, such as proving the CRA tax debt has been paid.

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