HST Assessments on House Flipping: A Growing Cause of Insolvency

A pattern I am seeing more and more often looks like this:

Someone buys a house.
They renovate it.
They sell it for a profit.

They believe the sale is tax-free because they lived there.

They do not charge HST.

Then, years later, the Canada Revenue Agency (CRA) reassesses.

The result can be devastating: income tax on the profit, HST on the sale (that wasn’t included above the sales price), interest, possible penalties — and in many cases, a consumer proposal or bankruptcy.

The core problem is simple:

“I lived there” is not the legal test that decides everything.

The common misunderstanding

Many people assume that if they:

• moved into the property
• changed their address
• lived there for some period of time

then the property must be their principal residence, and the profit must be tax-free.

That is not how the law works.

A property can be lived in and still:

• not qualify for the principal residence exemption, and
• still be subject to HST

There are really two separate tax problems

When CRA reviews these cases, they are asking two completely different questions:

1. Income Tax

Was this a capital gain, or was it really business income from flipping?

2. HST (GST/HST)

Was the seller a “builder” under the Excise Tax Act, making the sale taxable?

Most people only think about the first question — and often get it wrong.

They rarely consider the second — which is where the largest liabilities often arise.

The income tax issue: principal residence does not protect business income

The principal residence exemption only applies to capital gains.

It does not apply to business income.

If CRA determines that:

• the property was bought with the intention to renovate and sell, or
• the transaction was an “adventure in the nature of trade”

then the profit can be treated as fully taxable business income.

Once that happens:

• the principal residence exemption is gone, and
• the entire profit becomes taxable

CRA has been very clear: even one property can qualify as a flip.

And critically:

Living in the property does not override a profit-making intention.

Since 2023, this has become even stricter.

Under the flipped property rule (Income Tax Act, s. 12(12)):

• if a property is sold within 365 days,
• the profit is generally deemed to be business income, and
• the principal residence exemption is not available (subject to limited exceptions)

Living there briefly is not enough

This is where people get caught.

They think:

“I lived there — so I’m safe.”

But the real question is:

Why did you buy the property in the first place?

If the primary purpose was to:

• renovate, and
• sell for a profit

then short-term occupancy does not change the character of the transaction.

In plain terms:

Moving in for a while does not convert a flip into a principal residence.

The HST problem: where the real damage happens

Even if someone understands the income tax risk, they often completely miss the HST issue.

Most people know:

• selling a used home is usually HST-exempt

That is true — but only if the seller is not a “builder.”

The “builder” rules are much broader than people think

Under section 123(1) of the Excise Tax Act, a “builder” can include:

• someone who substantially renovates a home, or
• someone who buys property for resale as part of a profit-making venture

This does not require a construction company or multiple projects.

One project can be enough.

Substantial renovations can trigger HST

A “substantial renovation” generally means that most of the interior of the home has been removed or replaced.

When that happens, the home is effectively treated as new for HST purposes.

And once that happens:

• the sale may become taxable, and
• HST applies under section 165 of the Excise Tax Act

The worst part: the tax comes out of your pocket

Here is where it becomes financially devastating.

Most sellers:

• list and sell the property assuming no HST applies
• do not charge HST to the buyer

But if CRA reassesses later:

• the sale price is treated as HST-included
• the seller must pay the HST out of their own pocket

There is no way to go back to the buyer years later and collect it.

This is why these assessments are often six figures or more.

Moving in does not necessarily fix the HST problem

Some people think:

“Even if I was a builder, I moved in — so I’m fine.”

Not necessarily.

Under section 191 of the Excise Tax Act, a self-supply rule can apply.

In simple terms:

• if a builder renovates or builds a home
• and then moves into it

the law can treat that as if the builder:

• sold the property to themselves at fair market value, and
• must pay HST on that value

There is a narrow personal-use exception — but it requires that:

• the home was genuinely intended as a primary residence, and
• not part of a resale strategy

Temporary occupancy or resale intent can defeat that exception.

CRA enforcement is increasing

CRA has been actively auditing:

• house flippers
• short-term owners
• repeated principal residence claims
• renovation-heavy transactions

The Globe and Mail has reported on this issue multiple times, including:

• cases where taxpayers claimed principal residence treatment but were reassessed as flippers
• CRA targeting frequent home sales
• unexpected GST/HST liabilities arising from real estate transactions

These are not rare situations anymore.

Why this leads to insolvency

From an insolvency perspective, these cases are particularly severe.

Typically, the debtor ends up with:

• large tax liabilities (often $100,000–$300,000+)
• years of accumulated interest
• possible penalties
• no remaining asset (the property has already been sold)

There is no easy way to fix it.

Which is why many of these cases end in:

• a consumer proposal, or
• bankruptcy

Should you fight the assessment — or settle it?

When CRA reassesses, the instinct is often:

“This must be wrong — I need to fight it.”

Sometimes that is absolutely the right approach.

A tax lawyer can:

• identify errors in CRA’s analysis
• assess whether the facts support your position
• challenge the assessment through objection or Tax Court

But there is a second question that is just as important:

Does it make financial sense to fight?

The reality: fighting can be expensive

Tax disputes can cost significant money.

Some debtors spend:

• tens of thousands of dollars (or more)
• on lawyers, accountants, and litigation

Only to lose years later.

By that point:

• interest has grown
• resources are depleted
• and the same insolvency outcome remains

For insolvent debtors, this is a critical decision

If someone is insolvent, resources are limited.

Under the Bankruptcy and Insolvency Act, an insolvent person is someone who cannot meet their obligations as they come due or does not have sufficient assets to pay their debts in full.

In that situation, every dollar matters.

Money spent fighting a weak case may be money that could have been used to fund a consumer proposal

This is about strategy — not avoiding legal advice

This is not a warning against getting legal help.

In many cases, you absolutely should consult a tax lawyer.

But the decision should be strategic:

• What are the odds of success?
• What will it cost to fight?
• What happens if you lose?
• Would those funds be better used to settle the debt?

For insolvent debtors, that balance is critical.

Insolvency options are not for everyone

It is also important to be clear:

Insolvency solutions are not always appropriate.

If someone has:

• significant home equity, or
• other assets well in excess of the debt

then they may be able to resolve the issue without using insolvency proceedings.

But for someone who is truly insolvent, a proposal or bankruptcy may be the most practical path forward.

The right first step

The key is to act early — before money is spent and options narrow.

A proper review should determine:

• whether there is a realistic tax defence
• what it will cost to pursue it
• whether the person is actually insolvent
• and what settlement options are available

For many insolvent debtors, preserving resources to make a deal is more valuable than spending them fighting a losing battle.

Final takeaway

These cases are increasingly common — and increasingly misunderstood.

The biggest mistake I see is this:

People assume that because they lived in the property, they are protected.

They are not.

A property can be:

• lived in,
• sold, and
• still trigger business income tax and HST

When CRA reassesses years later, the result is often overwhelming.

And at that point, the question is no longer just about tax.

It becomes a question of how to deal with the debt.

If you have questions, or need help, feel free to call my office and schedule a free consultation.