A write-off is the removal of an asset's value or the deduction of an expense against income, reducing taxable profit, commonly used for bad debts, obsolete inventory or business costs.
"Write-off" is used loosely to mean two related things: deducting a business expense against income to reduce tax, and removing the value of an asset that no longer has worth, such as an uncollectible receivable or obsolete inventory. In both cases, profit and taxable income fall.
The popular idea that a write-off makes something "free" is a myth: a deductible expense reduces tax only by your marginal rate, so a $1,000 write-off saves perhaps $120 to $270 in tax, not $1,000. The expense must also be genuine and reasonable, spending money purely to "get the write-off" always leaves you poorer.
You hold $5,000 of inventory that has become unsellable. You write it off, removing it from assets and recording a $5,000 expense, which reduces your taxable income by $5,000 and your tax by your marginal rate on that amount.
Primary source
- Income Tax Act, s. 18(1)(a) General limitation
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Property tax is an annual municipal levy on real estate, charged by the city or town where the property sits rather than by the CRA. The bill is the assessed value of the property multiplied by the tax rate the municipality sets each year, and it funds local services such as roads, waste collection, policing and the education portion the province adds. Assessed value is set by a provincial assessment authority, so it is not the price you paid.
The basic personal amount is a non-refundable credit that shelters a base level of income from federal tax, so income below it carries no federal tax. The amount is indexed every year, and the enhanced portion is phased out across the second-highest federal bracket, so taxpayers in the top bracket receive only the base amount. Each province and territory sets its own version. On Form TD1 you claim it so your employer withholds less; claim it with one employer only, or too little tax is withheld.
Taxable income is what is left after you total the income the tax rules include and subtract the deductions you are allowed. Employment and self-employment earnings, most pensions, EI and CPP benefits, interest, dividends, rental profit, the taxable portion of capital gains, RRSP and RRIF withdrawals and most taxable benefits from work all go into the total. Tax is then calculated on that figure and reduced by non-refundable credits such as the basic personal amount.
In Canada the federal return for individuals is the T1, filed with the CRA, and it calculates your provincial or territorial tax in the same package, so there is no separate provincial return except in Quebec, where a second return goes to Revenu Quebec. Corporations file the T2 instead. To check a filed return or a refund, sign in to CRA My Account and read the notice of assessment, which shows what was accepted and any change the CRA made.
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Reviewed and fact-checked by Udit Gupta
Ex Big 4 — Ernst & Young, Deloitte · International & cross-border tax specialist · CPA Canada (In-Depth Tax Program) · Chartered accountant, ICAI & MIA
Udit Gupta has over 15 years of experience helping corporations and business owners with corporate structuring, corporate tax filing, bookkeeping, payroll, GST/HST, cross-border tax and CRA representation. Big 4 trained at Ernst & Young and Deloitte, and qualified as a chartered accountant in India and again in Malaysia, he founded his accounting practice in 2014 to serve entrepreneurs, startups and non-resident business owners across Canada. View full member bio.
The Institute of Chartered Accountants of India — member 521458 · Malaysian Institute of Accountants — member CA 44667 · Ex Big 4: Ernst & Young, Deloitte · CPA Canada (In-Depth Tax Program), completed 19 Dec 2023 · In-Depth GST/HST Part I, 12 Jul 2022 · Part II, 5 Jul 2023
Editorial policy. Every page is researched against primary sources — the Income Tax Act, CRA publications and CPA Canada guidance — and every rate or threshold is stated with the tax year it applies to.
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