HST Registration Effective Date Calculator
You have crossed thirty thousand dollars. The question is no longer whether to register, it is which day you stopped being a small supplier and which invoice should have carried thirteen percent. Get the exact date.
effective date
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Which Rule Applied, and When
| Test | Threshold | Your Figure | Result |
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The Dates That Follow
| Item | Basis | Date |
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Invoices Already Billed Without Tax
| Item | Basis | Amount |
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Points That Decide This
What to Do Next
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Disclaimer: A person ceases to be a small supplier under the Excise Tax Act on either of two tests. Where the total value of taxable supplies made by the person and its associates exceeds $30,000 in a single calendar quarter, the person ceases to be a small supplier immediately before the supply that pushed the total over, that supply itself is taxable, and registration is effective from that day with no grace period. Where the total exceeds $30,000 over four consecutive calendar quarters but was not exceeded in any single quarter, the person ceases to be a small supplier at the end of the month following the quarter in which the total was exceeded, and there is a period of grace during which supplies remain untaxed. Taxable supplies of associated persons are included in the threshold. Once registered, tax is collectible from the effective date, and where consideration was charged without tax after that date the amount received is generally treated as tax included, so the tax is extracted at 13/113 in Ontario rather than added at 13%. Assigned filing frequency is annual where taxable supplies do not exceed $1,500,000, quarterly between $1,500,000 and $6,000,000, and monthly above $6,000,000, and a registrant may elect a more frequent period. An annual filer that is a corporation must file within three months of its fiscal year end. Monthly and quarterly filers must file within one month of the end of the reporting period. Registration may be requested with an earlier effective date in certain circumstances. This page is general information, not tax advice.
There Are Two Rules and They Give Different Dates
Almost everything written about the thirty thousand dollar threshold stops at “you have to register”. The rule that actually matters is which of the two tests you tripped, because one gives you a month of breathing room and the other gives you none.
| Rule | Trigger | Effective Date | Grace |
|---|---|---|---|
| Single calendar quarter | Over $30,000 in one quarter | The day of the supply that crossed | None |
| Four consecutive quarters | Over $30,000 across four quarters | End of the month after that quarter | One month |
Under the single-quarter rule the invoice that crossed the line is itself taxable. Not the next one. That invoice. If it went out without HST, the tax is still owed on it and it comes out of what you were paid rather than being added on top.
The Invoice That Crossed Is the Whole Question
Under the single-quarter rule you cease to be a small supplier immediately before the supply that took the total past thirty thousand. That is a specific invoice on a specific day, and everything from that moment forward is taxable.
This is why the answer cannot be given as a month. A business that billed twelve thousand dollars on the fourth, ten thousand on the ninth and fourteen thousand on the fourteenth has an effective date of the fourteenth, and the fourteen thousand dollar invoice should have carried thirteen percent.
The Four-Quarter Rule Is Gentler
Where the threshold is crossed gradually across four consecutive quarters without any single quarter exceeding thirty thousand, the outcome is different. You cease to be a small supplier at the end of the month following the quarter in which the total was exceeded.
That month is genuine breathing room. Supplies made during it remain untaxed, and the obligation to charge begins after it. Most consultancies and trades cross this way rather than in a single quarter, which is why so many owners assume the grace period always exists.
Associates count, and this catches people with two corporations. The threshold looks at taxable supplies made by you and by anyone associated with you. Two corporations under common control each billing twenty thousand dollars are over the threshold together even though neither is over on its own.
Tax Is Treated as Embedded in What You Already Billed
This is the part that costs real money. Once registered, tax is collectible from the effective date. Where you billed without tax after that date, the amount you received is generally treated as tax included, so the tax is extracted at thirteen over one hundred and thirteen rather than added at thirteen percent.
| Billed Without HST | Tax Extracted at 13/113 | You Keep |
|---|---|---|
| $30,000 | $3,451 | $26,549 |
| $60,000 | $6,903 | $53,097 |
| $120,000 | $13,805 | $106,195 |
You can ask commercial clients to accept a corrected invoice, and registered customers usually will because they recover it as an input tax credit. Consumers and exempt customers will not, and that difference sits with you.
The input tax credits are the consolation, and they are worth having. From the effective date you can claim the HST on your own purchases, and there is relief for tax paid on inventory and certain property held at the moment of registration. On a business with real costs that recovers a meaningful part of the exposure.
What the Filing Frequency Will Be
| Annual Taxable Supplies | Assigned Frequency | Return Due |
|---|---|---|
| Up to $1,500,000 | Annual | Three months after the fiscal year end |
| $1,500,000 to $6,000,000 | Quarterly | One month after each quarter end |
| Over $6,000,000 | Monthly | One month after each month end |
An annual filer with a December year end who registers in May files one return covering the period from the effective date to 31 December, due the following 31 March. You can elect a more frequent period, and a business in a refund position often should, because quarterly filing gets the input tax credits back four times as fast.
Should You Have Registered Voluntarily Earlier?
Frequently, yes. A small supplier can register voluntarily at any time, and doing so before the threshold has one clear advantage: input tax credits on everything from day one.
- A business with significant start-up costs is leaving the HST on those costs on the table
- A business selling to registered businesses loses nothing by charging tax, since the customer recovers it
- A business selling to consumers genuinely does face a thirteen percent price question
- A business expecting to cross avoids this entire calculation by registering before it does
What This Calculator Does Not Cover
- Zero-rated and exempt supplies, which are treated differently in the threshold test
- Public service bodies, which have a different threshold
- Non-residents and the simplified registration regime for digital services
- Provinces outside Ontario, where the rate differs
- The precise input tax credit relief on property held at registration
- Penalty and interest on returns filed late once registered
Register with the correct effective date rather than today’s date. Our GST/HST registration service covers the date, the registration, the corrected invoices and the first return.
Frequently Asked Questions
Common questions on crossing the $30,000 threshold.
Related Calculators and Guides
More GST/HST tools for growing corporations.
Register with the Right Date, Not Today’s Date
Send us the revenue by month and the invoice that crossed the line. We will pin the effective date, register the corporation, work out the tax on what has already been billed and file the first return.