GST and QST are not just boxes to fill in a government portal. For a small business, they touch invoicing, purchases, cash flow, filing periods and sometimes even how prices are shown to clients.
Mixing taxable, zero-rated and exempt sales
A frequent mistake is applying sales tax to everything, or not applying it when it should be charged. The difference affects both remittances and input tax credits.
Before configuring products or services in QuickBooks, validate the tax treatment of each revenue category. A wrong setup repeats on every invoice.
Missing input tax credits
Many entrepreneurs remit taxes collected but fail to recover all eligible taxes paid on business purchases. That means unnecessary cost and less accurate margins.
Keep full supplier invoices, not just payment receipts. Supplier names, tax numbers and line details matter if a file is reviewed.
Treating collected taxes as available cash
Taxes collected are not yours. They pass through your bank account, but they will eventually be remitted.
A simple monthly review of the tax balance helps avoid cash flow pressure at filing time.