Glossary
GST/HST Compliance and Filings
GST/HST compliance means registering when you are required to, charging the right rate, claiming input tax credits properly, and filing and remitting on your assigned schedule. The rules themselves are not the hard part. What causes real damage is how sales tax gets recorded in the books, because a business can file correctly for years while its financial statements quietly misstate revenue. At Treewalk we handle the filings, and we find the recording errors during diligence.
The obligations in brief
- Registration. Required once you exceed the small supplier threshold, and available voluntarily below it. Registering voluntarily is often worth it, because it lets you recover input tax credits on startup costs.
- Charging correctly. The rate follows the place of supply, so where your customer is located matters, not where you are. Businesses selling across provinces are charging several different rates.
- Input tax credits. You recover the GST/HST you paid on business purchases, which is why documentation matters. An ITC without a supporting invoice is not supportable on review.
- Filing frequency. Annual, quarterly or monthly, assigned based on revenue. It changes as you grow, and the change is easy to miss.
- Remitting. Filing and paying are separate obligations. Filing on time and paying late still attracts interest.
Zero-rated and exempt supplies behave differently from each other in a way that catches people out. Zero-rated supplies are taxable at zero percent and you can still claim ITCs. Exempt supplies are outside the system and you cannot. Getting that classification wrong affects every return you file.
Where it actually goes wrong in the books
This is the part that matters and the part nobody writes about.
Sales tax recorded as an expense
We reviewed a business that was running sales tax collected from customers straight through the profit and loss as an expense line. That is only defensible if revenue was also recorded gross with the tax included, so the two offset. It was not. Tax you collect is not yours and it is not an expense: it is a liability on the balance sheet until you remit it. What made it visible was an inconsistency between two sides of the business. Retail invoices showed tax calculated separately, while wholesale invoices were a single line with no tax shown at all. Sampling both revealed the treatment did not hold together. The business had been filing on that basis for some time, which raises a further question about whether the returns and the statements ever agreed. The consequence is not academic. Recording it that way overstates both revenue and expenses. Reported revenue is not what the business actually earned, and any multiple applied to earnings built on it is being applied to the wrong number.
GST inside accounts receivable
Receivables are collected with tax on them, so the cash arriving is larger than the revenue recognised. On a proof of cash this is routinely the single largest reconciling item between deposits and reported revenue. It is entirely normal, but if nobody identifies it as the cause, it looks like an unexplained variance.
Unremitted amounts are debt, not working capital
GST/HST collected and not yet remitted is money held on behalf of the government. In a transaction it is treated as a debt-like item that the seller settles at close, not as ordinary working capital. Sellers frequently assume the opposite.
Why it matters in a transaction
Sales tax exposure is a classic unrecorded liability. It accumulates quietly, it carries interest and penalties, and in a share purchase the buyer inherits it.
| Finding | Consequence |
|---|---|
| Unremitted GST/HST | Debt-like item, settled by the seller at close |
| Sales tax booked through the P&L | Revenue and expenses restated, earnings change |
| ITCs claimed without documentation | Potential reassessment exposure |
| Wrong rate charged across provinces | Historic exposure plus a process fix |
| Not registered when required | Retroactive liability on past sales |
Multi-jurisdiction registration is also one of the structural triggers that pushes a business from needing a bookkeeper to needing a controller, because nobody is reliably watching it otherwise.
How we handle it
On ongoing engagements we prepare and file the returns, reconcile the GST/HST control accounts as part of the month-end close, and make sure what is on the balance sheet matches what has actually been remitted.
On diligence we test it as an integrity check rather than a compliance review: does the filing history match the ledger, does the collected tax reconcile to what was remitted, and is the recording treatment consistent across every revenue stream in the business.
Frequently asked questions
When do we have to register for GST/HST?
Once you exceed the small supplier threshold, and you may register voluntarily before that. Voluntary registration usually makes sense for a business with meaningful startup or equipment costs, because it lets you recover the tax paid on them.
Which rate do we charge for out-of-province customers?
It follows the place of supply, which generally means your customer’s location rather than yours. A business selling nationally is charging several different rates, and the rules differ for goods, services and digital products.
What happens if we file late?
Penalties and interest, calculated formulaically. Filing and paying are separate obligations, so filing on time without paying still accrues interest. Because it is automatic rather than discretionary, this is avoidable exposure.
Is unremitted GST a working capital item or debt?
Debt-like, in almost every transaction. It is money collected on behalf of the government rather than an operating payable, so it should be settled by the seller at close rather than sitting in the working capital calculation.
Do we need to keep every receipt for input tax credits?
Yes, in substance. ITCs need supporting documentation showing the tax paid and the supplier’s registration number. This is where receipt-capture tooling earns its cost, because reconstructing documentation later is far more expensive than capturing it as you go.
Where to next
If your sales tax has never been reconciled between what you collected, what you recorded and what you remitted, that gap is worth closing before someone else finds it. Our private company team handles filings and the reconciliations behind them. If a transaction is on the horizon, buy-side due diligence covers how unremitted amounts get treated. To talk it through, email Avnit Sekhon at avnit.sekhon@treewalk.com.
