HST in Ontario: A Complete Guide to Registration, Filing, and Input Tax Credits

Quick Answer: In Ontario, the Harmonized Sales Tax (HST) is 13%. Businesses must generally register once their taxable revenue exceeds $30,000 over four consecutive calendar quarters, which is the small supplier threshold. Registered businesses charge HST on taxable sales, claim input tax credits (ITCs) for HST paid on business expenses, and file returns monthly, quarterly, or annually depending on revenue. Some smaller businesses can simplify reporting with the Quick Method.

HST is one of the most misunderstood obligations for small businesses in Ontario. Owners are often unsure when they need to register, how often to file, what they can claim back, and what happens if they get it wrong. This guide works through each question.

What Is HST?

HST combines the federal Goods and Services Tax (GST) and the provincial sales tax into a single tax. In Ontario, the HST rate is 13%. The CRA administers it for both the federal government and the province.

HST applies to most goods and services sold in Ontario. Some supplies are zero-rated (taxable at 0%, such as basic groceries and many exports), and some are exempt (not taxable, such as most residential rent and many health and financial services). The difference matters. Zero-rated suppliers can still claim input tax credits. Exempt suppliers generally cannot.

When Do You Have to Register for HST?

You must generally register once you are no longer a small supplier. You stop being a small supplier when your worldwide taxable supplies, including those of associated businesses, exceed $30,000 in a single calendar quarter or over four consecutive calendar quarters.

• If you exceed $30,000 in a single quarter, you must start charging HST on the sale that caused you to exceed it.
• If you exceed $30,000 over four consecutive quarters, you must register, and begin charging HST, by the end of the month following the quarter in which you exceeded it.

Some businesses must register from day one regardless of revenue, such as taxi and commercial ride-sharing drivers.

Should You Register Voluntarily?

Businesses below $30,000 can register voluntarily. Reasons to consider it include:

• Claiming input tax credits on start-up costs and ongoing expenses
• Looking established to business clients, who may expect an HST number
• Avoiding a scramble if you expect to cross the threshold soon

The main downside is administration. Once registered, you must charge HST and file returns even in slow periods. If your clients are consumers rather than businesses, charging 13% more may also affect your pricing.

How Often Do You File HST Returns?

Your assigned reporting period generally depends on annual taxable revenue:

• Annual filing is typically assigned to businesses with $1.5 million or less
• Quarterly filing applies to businesses above $1.5 million up to $6 million
• Monthly filing applies to businesses above $6 million

Smaller businesses can elect to file more often, which can help if they regularly receive refunds or prefer smaller, more frequent payments.

Due dates: Monthly and quarterly returns and payments are generally due one month after the end of the reporting period. Annual returns are generally due three months after fiscal year-end. There is a special rule for individuals with business income and a December 31 year-end: the return is due June 15, but payment is due April 30.

Annual filers may also be required to make quarterly instalments if their net tax exceeds a threshold.

Input Tax Credits: Getting Your HST Back

Input tax credits let registered businesses recover the HST they pay on purchases used in commercial activities. You calculate net tax as HST collected minus eligible ITCs. If ITCs exceed HST collected, you are owed a refund.

Commonly eligible expenses include office supplies, equipment, software, professional fees, rent (commercial), advertising, and vehicle expenses (subject to rules).

Key rules to know:

• Documentation matters. Claims must be supported by invoices or receipts showing the required information, which generally includes the supplier’s GST/HST registration number for larger purchases.
• Personal use must be excluded. Only the business-use portion of mixed-use expenses is eligible.
• Meals and entertainment ITCs are generally limited to 50%, mirroring the income tax rules.
• Time limits apply. For most businesses, ITCs must be claimed within four years of the period in which they could first have been claimed.

The Quick Method: Simpler HST for Smaller Businesses

Eligible businesses with annual taxable supplies (including HST) of $400,000 or less may elect the Quick Method. Instead of tracking HST on every expense, you remit a fixed percentage of your HST-included sales. The rate depends on whether you mainly provide services or resell goods. ITCs are still claimed separately on capital purchases.

For service businesses with low expenses, the Quick Method can mean less paperwork and sometimes lower net tax. For businesses with significant taxable expenses, the regular method may produce a better result. It is worth running the numbers both ways before electing.

Some businesses are not eligible for the Quick Method, including certain professional service providers such as accountants, lawyers, and financial institutions.

Common HST Mistakes

Spending HST collections. HST collected is held in trust for the government. Set it aside in a separate account.

Charging the wrong rate. Out-of-province sales may carry different rates depending on where the customer is located.

Missing ITCs. Many small businesses under-claim because receipts are lost or expenses are miscategorized.

Claiming ITCs on exempt supplies. Businesses making exempt supplies generally cannot claim ITCs on related expenses.

Filing late or not at all. Even with no activity, a registered business must file a nil return for each period.

How Solstice Partners Helps With HST

Solstice Partners handles HST registration, bookkeeping, and filing for small businesses across Toronto and the GTA. We make sure you are charging the right rate, claiming every eligible input tax credit, and filing on time, whether monthly, quarterly, or annually. We can also help you evaluate whether the Quick Method makes sense for your business.

Frequently Asked Questions

What is the HST rate in Ontario?
13%.

Do I have to register for HST if I make less than $30,000?
Generally no, but you can register voluntarily, which may let you claim input tax credits.

How long do I have to claim input tax credits?
For most businesses, four years from the period in which the ITC could first be claimed.

What is the Quick Method of accounting for HST?
A simplified method for eligible businesses with annual taxable supplies of $400,000 or less. You remit a set percentage of your HST-included sales instead of tracking HST on every expense.

Do I need to file an HST return if I had no sales?
Yes. Registered businesses must file a return for every reporting period, including nil returns.

What happens if I file HST late?
The CRA can charge penalties and interest on late returns and unpaid balances.

Need help with HST registration or filing? Contact Solstice Partners today.