How Mixing Personal and Business Accounts Cost One Canadian Business Owner $23,000 in GST — And How We Fixed It

She called me after CRA sent a notice. The assessment was for $23,000 in unpaid GST/HST, and she had no idea it was coming.

She was not a careless business owner. She was a busy one — running two small businesses simultaneously, trying to keep up with clients, and doing what a lot of Canadian entrepreneurs do: paying for things on whatever card was in her hand at the time and sorting it out later.

The problem was that later never came. And when CRA came looking, there was no clear record of what she had collected, what she could claim back, and what she actually owed. So CRA made their own assessment. And it was not a kind one.

This is the story of what happened, what we did about it, and what you need to know so you do not end up in the same position.

The Setup — Two Businesses, Seven Accounts, No Clean Records

The client — I will call her Maya — operated two businesses out of her home in a major Canadian city. One was an events company that had been running for several years. The other was newer, in the hospitality space, and still growing.

Between the two businesses she had four dedicated business accounts — two chequing accounts and two Visa cards. On top of that she had a personal chequing account and two personal credit cards, both of which regularly had business expenses on them because she wanted to earn travel rewards points.

When we started the cleanup, the records covered roughly two years. Here is what we were looking at:

•      Seven accounts across two businesses and personal banking

•      No reconciliations had been done since the accounts were opened

•      Business expenses scattered across three personal accounts

•      Intercompany transfers between the businesses that had never been recorded

•      A GST/HST account that had not been properly maintained

•      No source documents matched to transactions

The business accounts alone had over 800 transactions across the two years. The personal accounts added hundreds more that needed to be reviewed individually to separate business from personal.

Where It All Went Wrong — The Personal Account Problem

Here is the thing about running business expenses through personal accounts: it is not just a bookkeeping inconvenience. It is a real financial risk.

Every time Maya paid for a business expense on her personal Visa, that transaction had to be found, identified as business-related, and posted to the correct company's books. If it was not found — which happens constantly when nobody is looking — it never became an Input Tax Credit (ITC).

What Is an Input Tax Credit (ITC)?

When you are registered for GST/HST in Canada, you pay tax on business expenses just like anyone else. But you get to claim that tax back. The amount you claim back is called an Input Tax Credit. Every business expense that goes unrecorded is an ITC you cannot claim. And every unclaimed ITC is money you paid to CRA that you did not have to.

Over two years, Maya had thousands of dollars in business expenses on personal accounts that had never been identified, never been coded to her businesses, and never been claimed as ITCs. When CRA assessed her, they were looking at her GST/HST collected and her remittances — and the remittances were short because nobody had been tracking what she could claim back.

The $23,000 assessment was not just about GST she had collected and not remitted. It was also about ITCs she had never claimed because the records did not exist to support them.

The Cleanup — What We Actually Did

The engagement covered January 2024 through February 2026. Here is the methodology we used:

Step 1: Reconcile the Business Accounts First

We started with the four dedicated business accounts because those were the baseline. Every transaction was categorized, every month was reconciled, and the books were brought fully up to date in Xero. This gave us a clean foundation before we touched anything else.

Step 2: Review Every Personal Account Transaction

Then we went through each personal account line by line — three accounts, two years, hundreds of transactions. For each one we asked: is this business or personal? If business, which company? If we could not tell from the description alone, we flagged it and asked Maya to confirm.

Everything personal — restaurant meals, groceries, Mexico travel, nail salons, pet supplies — was excluded and documented. Everything business was coded, posted as an owner's contribution, and matched to the correct company.

Step 3: Reconcile the Intercompany Accounts

Money had moved between the two businesses dozens of times without being recorded. We identified every transfer, matched each one to the corresponding entry in the other company, and got the intercompany accounts to zero. A balanced intercompany account is not optional — it is something every CPA will check.

Step 4: Organize the Evidence

Every business expense found in a personal account was organized by company, year, and source account, with a full working schedule prepared for the accountant. The goal was a file that any CPA could pick up and immediately understand — with no unexplained gaps and nothing left for them to hunt down.

What the Accountant Still Had to Do

Our job was to get the books accurate and organized. Some decisions were above our pay grade as bookkeepers, and we said so clearly in our handoff letter:

•      The $23,000 assessment and its settlement needed to be posted to the correct period — a determination that required the CPA's judgment on what portion was tax, what was penalties, and what tax year it related to.

•      The home office rent and utilities needed a business-use-of-home calculation to determine the deductible percentage.

•      The GST/HST account needed to be reviewed and adjusted for accuracy going forward.

This is the proper boundary between a bookkeeper and an accountant. The bookkeeper makes the file accurate and complete. The accountant makes the tax decisions. When both sides do their job, the outcome is a file that does not get picked apart.

The Outcome

At the end of the engagement Maya had two fully reconciled sets of books, an organized file package ready for her accountant, and a working system in Xero and Hubdoc so the same problem would not happen again.

She also had a clear picture of what the $23,000 assessment actually represented and what she needed to discuss with her accountant — which is a very different position from where she started.

What You Can Do Right Now to Avoid This

If any part of Maya's story sounds familiar, here are the most important things you can do today:

•      Stop putting business expenses on personal credit cards. The points are not worth it. The extra bookkeeping cost alone will exceed them, and that is before you factor in the ITCs you are not claiming.

•      If you are registered for GST/HST — or should be — track what you collect and what you can claim every single month. Do not wait until year-end.

•      If you have not reconciled your accounts in more than three months, get current before the backlog becomes unmanageable.

•      Make sure your bookkeeper and your accountant are not the same person trying to do two different jobs. The boundary matters.

The $30,000 Threshold

If your business earns more than $30,000 in taxable revenue in any single calendar quarter, or in four consecutive calendar quarters, you are required to register for GST/HST and begin collecting it immediately. There is no grace period. If you cross the line unregistered, you are personally liable for all GST/HST that should have been collected — whether or not you collected it from your customers.

A Final Thought

The $23,000 assessment was painful. But it was also fixable. What is harder to fix is the pattern that created it — a pattern of putting off the bookkeeping, assuming it will sort itself out, and hoping CRA does not look too closely.

They always look eventually. The question is whether your records are ready when they do.

If your books are behind — or you are worried about what a CRA review might find — reach out at sbbs2009.com. That is exactly what we do.

About the Author: Charlett Millen is the founder of Strategic Business Building Solutions (SBBS), a virtual bookkeeping practice serving Canadian small businesses and non-profits. She specializes in cleanup, reconstruction, and audit preparation — the work most people dread. sbbs2009.com