GST/HST Filing Checklist for Businesses | Custom CPA
GST/HST Filing Checklist for Businesses
📌 Quick Summary
Every GST/HST-registered Canadian business must file accurate returns with the CRA on time — or face penalties and interest. This comprehensive guide walks you through every step: registration requirements, filing deadlines, documents to gather, Input Tax Credits (ITCs) you can claim, and the most common costly mistakes to avoid. Whether you file monthly, quarterly, or annually, this checklist keeps you organized, compliant, and audit-ready in 2024–2025.
1. GST/HST Registration Requirements
The Goods and Services Tax (GST) and Harmonized Sales Tax (HST) are federal consumption taxes administered by the Canada Revenue Agency (CRA). Understanding when you must register is the first step in staying compliant. Registration is mandatory once your business crosses the $30,000 revenue threshold.
Corporations and partnerships engaged in commercial activities within Canada.
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If you are a small supplier (under $30,000 in taxable revenue), you are not required to register — but you may choose to do so voluntarily to claim ITCs on business expenses. Learn more about our Core Accounting & Tax Services.
For Saskatchewan-based businesses, understanding both federal GST and provincial PST obligations is critical. Our team at Custom CPA specializes in helping businesses across Saskatchewan stay registered and compliant — see our post on Corporate Bookkeeping Experts in Saskatchewan for more context.
🚀 Not Sure If You Need to Register for GST/HST?
Our tax professionals can assess your situation and handle CRA registration for you — fast and hassle-free.
The CRA assigns your filing frequency — monthly, quarterly, or annually — based on your annual taxable supplies. Missing a deadline triggers automatic penalties, so knowing your due dates is non-negotiable.
Filing Frequency
Annual Taxable Supplies
Return Due Date
Payment Due Date
Annual (Individuals/Sole Proprietors)
≤ $1,500,000
June 15 of the following year
April 30 of the following year
Annual (Corporations)
≤ $1,500,000
3 months after fiscal year-end
3 months after fiscal year-end
Quarterly
$1,500,001 – $6,000,000
1 month after quarter-end
1 month after quarter-end
Monthly
> $6,000,000
1 month after month-end
1 month after month-end
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Key Note for Annual Filers: Even though the filing deadline is June 15, any balance owing must be paid by April 30. Filing late and paying late are separate penalties — don't confuse the two.
Quarterly Deadlines at a Glance
GST/HST Quarterly Filing Deadlines (Calendar Year Filers)
Q1 (Jan–Mar)
April 30
Apr 30
Q2 (Apr–Jun)
July 31
Jul 31
Q3 (Jul–Sep)
Oct 31
Oct 31
Q4 (Oct–Dec)
Jan 31
Jan 31
3. Documents & Records Checklist Before You File
Accurate record-keeping is the backbone of a clean GST/HST return. The CRA requires you to keep supporting documents for at least six years. Use this pre-filing checklist to confirm you have everything organized. Our Monthly Bookkeeping Review Checklist can help you stay on top of this year-round.
GST/HST account number — your Business Number (BN) ending in RT0001.
Total sales and revenue — gross revenue from all taxable and zero-rated supplies for the period.
GST/HST collected — the total tax you charged customers, backed by sales invoices.
Purchase invoices and receipts — all business expenses showing GST/HST paid (for ITC claims).
Supplier names & BNs — for any single purchase over $30, you need the supplier's name; over $150, their BN.
Credit note and adjustment records — any adjustments to previously issued invoices.
Import/export records — if you import commercial goods, you may have paid GST at the border.
Prior period returns — compare current vs. prior period for consistency and anomaly detection.
Bank statements — reconcile deposits to declared sales; CRA auditors often start here.
CRA My Business Account access — confirm your online account is active and updated.
For e-commerce businesses, document requirements become more complex when dealing with cross-border transactions. Read our dedicated guide on Tax Consulting for Regina E-Commerce Businesses to understand how digital sales affect your GST/HST obligations.
📂 Is Your Bookkeeping GST-Ready?
Messy books lead to missed ITCs and CRA notices. Let Custom CPA organize your records and file accurately.
4. Input Tax Credits (ITCs) — What You Can & Cannot Claim
An Input Tax Credit (ITC) is a recovery of the GST/HST you paid on business purchases. ITCs reduce the net tax you owe the CRA. Maximizing your ITC claims legally is one of the most impactful ways to lower your tax bill.
Eligible ITC Expenses
Expense Category
ITC Eligibility
Restriction
Office supplies & equipment
✅ 100% eligible
Must be for commercial activity
Business rent & utilities
✅ 100% eligible
Proportional if home office
Professional fees (accounting, legal)
✅ 100% eligible
None
Meals & entertainment
⚠️ 50% eligible
Only 50% of GST/HST claimable
Passenger vehicles (class 10.1)
⚠️ Partial
Capital cost limit applies
Personal-use items
❌ Not eligible
No commercial use
Exempt supplies expenses
❌ Not eligible
E.g., residential rent, health services
Employee wages & salaries
❌ Not eligible
No GST/HST charged on wages
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Pro Tip: Keep all receipts showing the supplier's name, GST/HST registration number, date, and the GST/HST amount charged. Digital copies are acceptable to the CRA. Review our Financial Data Preparation Checklist for a complete record-keeping framework.
Documenting ITC Requirements by Purchase Size
Purchase Amount (Before Tax)
Minimum Info Required on Receipt/Invoice
Under $30
Supplier name, date, total paid, GST/HST amount (or statement that it's included)
Canada's sales tax structure varies significantly by province. Knowing the correct rate to charge your customers — and to account for in your returns — is critical for accurate filing.
Province / Territory
Tax Type
Federal GST
Provincial Rate
Total Rate
Ontario
HST
5%
8%
13%
New Brunswick
HST
5%
10%
15%
Nova Scotia
HST
5%
10%
15%
Newfoundland & Labrador
HST
5%
10%
15%
Prince Edward Island
HST
5%
10%
15%
British Columbia
GST + PST
5%
7% PST
12%
Saskatchewan
GST + PST
5%
6% PST
11%
Manitoba
GST + RST
5%
7% RST
12%
Quebec
GST + QST
5%
9.975% QST
14.975%
Alberta / Territories
GST only
5%
0%
5%
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In Saskatchewan, BC, Manitoba, and Quebec, the provincial sales tax is administered separately from GST. You must file two separate returns — one with the CRA (GST) and one with the provincial authority (PST/QST/RST).
6. Step-by-Step GST/HST Filing Process
Whether you file online through My Business Account or use accounting software, the mechanics are the same. Follow these steps every reporting period to ensure a clean, accurate submission.
Reconcile your books — ensure all sales and purchase entries for the period are recorded and categorized in your accounting system (QuickBooks, Xero, etc.).
Calculate total taxable supplies — include all taxable and zero-rated sales (exclude exempt sales).
Total GST/HST collected (Line 103 on the return) — the tax you charged customers.
Calculate total ITCs (Line 106) — sum up all eligible GST/HST paid on business purchases.
Compute net tax (Line 109) — GST/HST collected minus ITCs. A positive amount = you owe; negative = CRA refunds you.
Enter adjustments — bad debts, instalment credits, or any CRA-approved adjustments.
File electronically — use CRA My Business Account (NETFILE), your accounting software's e-file feature, or a CPA on your behalf.
Pay any balance owing — via online banking, CRA My Payment, or pre-authorized debit.
Save confirmation number — retain the CRA submission confirmation number and a copy of the filed return for your records.
Review for next period — immediately begin tracking sales and expenses for the next reporting period.
Unsure whether to handle this yourself or hire a professional? Our article DIY Bookkeeping vs. Professional Services breaks down the real costs and risks of each approach — especially for complex GST/HST situations.
🧾 Let Us Handle Your GST/HST Filing
Stop worrying about CRA deadlines. Our CPAs file accurately, on time, every time — and maximize your ITC refunds.
Even well-intentioned business owners make errors that trigger CRA reassessments and costly penalties. Here are the most frequent — and most avoidable — GST/HST mistakes:
Top Reasons for CRA GST/HST Reassessments (% of audit findings)
Missing/invalid ITC docs
82%
~82%
Incorrect tax rate used
61%
~61%
Sales under-reported
54%
~54%
Personal expenses claimed
47%
~47%
Late or missed filings
39%
~39%
Mistake Checklist — Avoid These at All Costs
Claiming ITCs without proper documentation — the CRA will disallow claims without valid receipts or invoices.
Mixing personal and business expenses — ITCs are only for business-use purchases; personal expenses are never eligible.
Not reporting zero-rated supplies as sales — zero-rated sales (exports, basic groceries) must be included in total sales even though no tax is charged.
Applying the wrong provincial rate — especially when selling to customers in different provinces (the "place of supply" rules apply).
Filing after the deadline without a nil return — even if you had $0 in sales, you must file a nil return to avoid a late-filing penalty.
Forgetting to claim 100% of meals at 50% — only 50% of the GST/HST paid on meals and entertainment can be claimed as an ITC.
8. CRA Penalties & Interest — What's at Stake
Ignorance of CRA rules is not a defence. Penalties compound quickly. Here's a clear breakdown of what the CRA charges for non-compliance:
Offence
Penalty / Consequence
Late filing (with balance owing)
1% of balance owing + 25% of that 1% per full month late (max 12 months)
Retroactive registration + back taxes + interest from the date registration was required
Gross negligence or willful evasion
Up to 50% of unpaid tax + possible criminal prosecution
False ITC claims
100% penalty on the false claim amount
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If you've missed filings or made errors, the CRA's Voluntary Disclosures Program (VDP) allows you to come forward, correct errors, and potentially avoid prosecution and some penalties. Contact a qualified tax professional immediately. Our Specialized Services include CRA representation and voluntary disclosure assistance.
Proactive financial planning is always better than damage control. Our Business Planning & Financial Modeling services can help you build systems that prevent compliance issues before they arise.
9. Frequently Asked Questions (FAQs)
These are the most common questions Canadians search on Google about GST/HST filing:
When is the GST/HST filing deadline for small businesses in Canada?
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For annual filers who are individuals or sole proprietors, the return must be filed by June 15, but any balance owing is due by April 30. Corporations must file within three months of their fiscal year-end. Quarterly filers are due one month after each quarter-end; monthly filers are due one month after each month-end. Missing the payment deadline triggers daily compounding interest regardless of when you file.
What is the GST/HST registration threshold in Canada?
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The mandatory registration threshold is $30,000 in taxable supplies over four consecutive calendar quarters (or in a single quarter). Once you exceed this amount — even by $1 — you must register within 30 days and begin collecting GST/HST. Note that some businesses (e.g., taxis, ride-sharing) must register immediately regardless of revenue.
Can I claim Input Tax Credits (ITCs) on all business purchases?
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Most business purchases used to earn taxable income are ITC-eligible, but there are key restrictions: meals and entertainment are limited to 50%, personal-use items are ineligible, and expenses related to exempt supplies (e.g., residential rents, most healthcare) cannot generate ITCs. You also need proper documentation — supplier name, GST/HST number (for purchases over $150), and the GST/HST amount clearly stated.
What happens if I miss the GST/HST filing deadline?
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Late filing with a balance owing incurs an automatic penalty of 1% of the balance plus 25% of that 1% for each full month late (up to 12 months). Interest compounds daily on any unpaid balance at the CRA's prescribed rate. Repeated late filing within three years results in steeper penalties (10% + 2%/month up to 20 months). The best action is to file immediately even if you can't pay — the late-filing penalty is separate from late-payment interest.
Do I charge both GST and HST, or just one?
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It depends on your province and your customer's province (place of supply rules). In HST-participating provinces (Ontario, New Brunswick, Nova Scotia, Newfoundland & Labrador, PEI), you charge a single combined HST rate. In other provinces (AB, SK, BC, MB, QC), you charge the 5% federal GST only — the provincial tax (PST/RST/QST) is a separate obligation. When selling across provinces, the rate charged depends on where the customer receives the goods or services.
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Disclaimer: The above contents are provided for general guidance only, based on information believed to be accurate and complete, but we cannot guarantee its accuracy or completeness. It does not provide legal advice, nor can it or should it be relied upon. Please contact/consult a qualified tax professional specific to your case.
