GST/HST registration: when your business must register

GST/HST confuses more small business owners than any other tax, usually because nobody explains the one number that matters: $30,000. Get that threshold and a couple of rules right and the rest falls into place. Here's the plain-English version.

The $30,000 threshold

You must register for GST/HST once your taxable revenue passes $30,000. Specifically, that's over any four consecutive calendar quarters, or in a single calendar quarter. Below that, you're a “small supplier” and registration is optional.

Should you register before you have to?

Often, yes — because of input tax credits (below). If you're spending money on equipment, software, inventory or professional fees to get started, voluntary registration lets you recover the GST/HST on those costs. It's also worth it if your customers are registered businesses, since they simply claim back the tax you charge them.

The trade-off: once registered, you must charge tax, file returns and stay compliant even in slow periods. For a genuinely tiny side business with few expenses, staying a small supplier keeps life simpler.

Input tax credits: recovering what you pay

This is the mechanic that makes GST/HST net out fairly. You collect tax from customers, you pay tax on business purchases, and you remit only the difference. Those recoverable amounts are input tax credits (ITCs). If your ITCs exceed the tax you collected — common in a startup or investment year — you get a refund. Clean bookkeeping is what makes ITCs easy to claim, which is why we bundle it into our bookkeeping service.

Which tax applies where you operate

The regime depends on your province: HST (a single combined rate) in Ontario and Atlantic Canada; GST plus a separate PST in BC and Saskatchewan; GST plus RST in Manitoba; and GST only in Alberta and the territories. A remote CPA files the right one for wherever your business operates. Which of those rates actually applies to a given sale is decided by the place-of-supply rules, not by where your office is — and sales to customers outside Canada follow the separate export and non-resident rules.

Filing frequency

How often you file depends mostly on revenue — smaller businesses typically file annually, mid-size quarterly, and large filers monthly. You can elect to file more often (useful if you're regularly in a refund position). We set you up on the schedule that fits and handle it through our online GST/HST filing service.

The bottom line

Register when you cross $30,000 — sooner if you have real expenses to recover — claim your input tax credits, and file on the right schedule for your province. Done properly, GST/HST is just bookkeeping hygiene. Done late, it's penalties and back-filing. If you're unsure where you stand, a quick consultation sorts it out.

This article is general information for Canadian business owners and is current as of July 2026. It is not tax, legal or accounting advice, and it does not create a client relationship. Tax rules change and your situation is unique — please speak with a CPA before acting on anything here.

Registering in a province we do not sit in changes nothing about how we file for you. We handle GST/HST registration for owners across Canada, including as an Vancouver small business accountant, working with us from Toronto, our Ottawa page, Calgary business owners, CPA for Edmonton owners and Winnipeg.

Once registered you are on a filing cycle. See what that cycle looks like and when returns are due.