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Tax exempt describes an amount or a transaction that tax does not apply to at all, which is different from a deduction or credit that merely reduces tax. Common examples are supplies that are exempt or zero-rated for GST/HST, investment income earned inside a TFSA, and specific receipts Parliament has excluded from income. Registered charities and non-profits can be exempt from income tax while still carrying filing duties. Exemption is never automatic; the rule must fit your facts.

Federal tax is the share of income tax that goes to the federal government, charged on taxable income in graduated brackets that are the same everywhere in Canada. Your total bill is that federal amount plus your province or territory's own tax, less the credits you claim. Payroll deductions shown on a T4 cover both layers. Quebec residents receive a refundable abatement of their federal tax because Quebec opted out of certain federal-provincial programs and funds them itself; separately, Quebec also collects its provincial tax through its own return.

The business number is the single identifier the CRA uses for your business, with a separate programme account opened under it for each obligation: GST/HST, payroll deductions, corporate income tax, import and export. Register through Business Registration Online, by phone or by mail, or receive one automatically when you incorporate federally. You need it before you can remit payroll or file GST/HST. Provincial registration is separate in some provinces, notably Quebec, where Revenu Québec administers its own accounts.

Canada has no personal exemption in the American sense. The equivalent is the basic personal amount, a non-refundable credit every resident can claim, which cancels federal tax on a first slice of income, and each province has its own version at a different level. The federal amount is indexed annually and is reduced for taxpayers in the top bracket. It is applied automatically when you file, so there is nothing to elect or apply for.