TL;DR
GST and HST you collect from clients is held in trust for CRA. It was never your money. Here is how net tax, input tax credits, and filing frequency work so you are never short at remittance time.
GST and HST are the most misunderstood taxes in small business. Owners treat them as revenue. They spend them. Then a remittance is due and the account is short. This is not a cash flow problem. It is a trust account problem.
Every dollar of GST and HST you collect from a customer is held in trust for CRA. It was never your money. You are a collection agent for the government. When remittance is due, you hand it over.
How Net Tax Actually Works
The amount you remit is not the total GST/HST you collected. It is net tax: the tax you collected on sales minus the input tax credits (ITCs) you are entitled to claim on business purchases.
If you collected $8,000 in HST from clients and paid $1,200 in HST on business expenses that qualify for ITCs, your net tax owing is $6,800. You send CRA $6,800, not $8,000.
ITCs are only claimable on legitimate business expenses. Personal expenses, meals at 50% restriction, and certain exempt categories do not generate full ITC recovery. The details of what qualifies depend on your industry and business structure. Your accountant handles the specifics. The core concept is that you net off what you paid to get to what you owe.
How Filing Frequency Is Determined
CRA assigns your filing frequency based on your annual taxable supplies, which means your total revenue subject to GST/HST.
- Annual filing: Under $1.5 million in annual taxable supplies. One return per year, due three months after your fiscal year end.
- Quarterly filing: Between $1.5 million and $6 million. Four returns per year, due one month after each quarter ends.
- Monthly filing: Over $6 million in annual taxable supplies. Twelve returns per year, due one month after each month ends.
New registrants are generally assigned annual filing by default. You can elect to file more frequently if you prefer. Some businesses elect quarterly or monthly voluntarily because they consistently get refunds (high ITCs relative to collected tax) and want access to those refunds faster.
The Common Mistake and What It Costs
Annual filers face the biggest risk. If you collect HST throughout the year and file once, you might be holding 12 months of accumulated HST when the return is due. If you have spent that money, you are looking at a lump-sum payment to CRA plus potential interest and penalties.
CRA charges interest on late remittances at the prescribed rate, which adjusts quarterly. Persistent late filing adds penalty percentages on top. A business that misses its annual filing by a few months on a $30,000 net tax balance starts seeing that balance grow meaningfully within a single quarter.
More practically: a business that routinely runs close to zero in its account will find a $30,000 annual remittance catastrophic. The same business paying $7,500 quarterly or $2,500 monthly never faces that wall.
An Illustrative Example
A consulting firm with $400,000 in annual revenue is an annual filer. They invoice at 13% HST in Ontario, collecting roughly $52,000 in HST over the year. Their eligible ITCs on business expenses run about $8,000 annually. Net tax owing: approximately $44,000 due in March.
If the owner has been treating HST as operating cash throughout the year, March becomes a crisis. If the owner has been setting aside the net HST in a separate account each month, March is a scheduled transfer.
The firm voluntarily elects quarterly filing. Now the obligation arrives four times a year at roughly $11,000 each. Each quarter, they move the accumulated HST reserve and file. No surprises. No interest.
What to Do About It
- Open a separate account and label it GST/HST. Every time a client payment arrives, move the tax portion immediately. If a client pays you $11,300 including 13% HST, transfer $1,300 to the GST account on the same day.
- Do not wait until filing time to calculate your ITCs. Track business purchases with HST paid throughout the period so you know your approximate net tax at any given moment.
- Log into your CRA My Business Account and confirm your filing frequency and your next due date. Many business owners are unsure of both. This takes five minutes and eliminates guessing.
- If you are an annual filer and your net tax is significant, consider electing quarterly. The smaller, more frequent payments are easier to manage. You can make the election through CRA My Business Account or by calling CRA.
- File on time even if you cannot pay the full balance. Filing late adds penalties on top of interest. Filing on time and paying late only accrues interest. Always file on the due date regardless of your cash position.
A Note on HST-Exempt and Zero-Rated Supplies
Not every sale attracts HST. Some goods and services are zero-rated (taxable at 0%, so no HST charged but ITCs still claimable) and others are exempt (no HST charged and no ITCs on related inputs). Basic groceries and most exports are zero-rated. Certain healthcare, financial services, and residential rent are exempt. If your business operates in these areas, your net tax calculation and ITC entitlement work differently. Get the classification right before assuming your filing is straightforward.
The Bottom Line
GST and HST collected from clients is not revenue. It is a liability sitting in your account waiting for CRA. Treat it that way from day one and you will never scramble for a remittance. Set up the separate account, move the tax portion on collection, and file on time. If you want help building a remittance system that fits your business, book a free call at peterxiacpa.com/book.
Next step: run your numbers through the free CFO scorecard.
Frequently Asked Questions
- How does CRA determine whether I file GST/HST monthly, quarterly, or annually?
- CRA assigns filing frequency based on your annual taxable supplies. Under $1.5 million qualifies for annual filing. Between $1.5 million and $6 million is quarterly. Over $6 million is monthly. You can also elect to file more frequently than required.
- What are input tax credits and how do they reduce what I owe?
- Input tax credits (ITCs) let you recover the GST/HST you paid on eligible business expenses. Your net tax owing is the GST/HST you collected minus your ITCs. If you collected $8,000 in HST and paid $1,200 in HST on qualifying business purchases, you remit $6,800.
- What happens if I miss a GST/HST filing deadline?
- Filing late triggers a penalty in addition to interest on any unpaid balance. CRA charges interest at the prescribed rate from the due date. Always file on time even if you cannot pay the full amount, because filing late compounds the cost beyond just the interest on the balance.
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