Business Tax

Bad Debt Tax Deduction Canada: Writing Off Unpaid Invoices

By · Managing Partner and Founder November 13, 2026 No Comments
This article is for informational purposes only and does not constitute tax or financial advice. Consult a qualified accounting professional before making any tax or financial decisions.

Quick Answer

Yes — a Canadian business can deduct an unpaid customer invoice as a bad debt, but only when three conditions are met. The amount must have been included in income in the current or a prior year, the debt must have become uncollectible during the tax year, and the business must be able to show it took reasonable steps to collect. Simply being overdue is not enough: CRA expects evidence such as collection letters, phone logs, a demand notice, or confirmation the customer has ceased operations. The deduction is claimed under Income Tax Act s. 20(1)(p); GST/HST already remitted on the invoice can often be recovered separately under Excise Tax Act s. 231 within two years. Cash-method filers who never reported the invoice as income cannot claim the deduction because there is no income to offset.

Why November Is the Right Time to Review Your Receivables

Most Ontario business owners can name the one or two customers who have been "about to pay" since summer. By November, those invoices have aged past hope — and past the point where another reminder email is likely to change anything. The good news is that a year-end accounts-receivable review gives you time to turn a cashflow disappointment into a legitimate tax deduction, provided CRA’s rules are met.

A bad-debt write-off does not get the cash back. It does, however, let you stop paying income tax on revenue you never actually received. For many small businesses carrying one or two large uncollectible invoices, that recovery can be meaningful. If you would like a professional review of your ledger before December, our small business accounting services team runs this exercise every year.

s. 20(1)(p)Income Tax Act bad-debt rule
2 yrsHST/GST recovery window
Line 8590T2125 bad debts
~5,8002025 Canadian business insolvencies
ClearWealth Accounting Advisors
Business Insolvencies Filed in Canada, 2023–2025
Rising insolvencies make bad-debt exposure a real year-end planning concern for Canadian SMEs.
2-year change
approx. +44%
2025 (approx.)
approx. 5,800 filings
Source: Office of the Superintendent of Bankruptcy Canada — Insolvency Statistics. ClearWealth Accounting Advisors · clearwealth.tax · For informational purposes only.

Quick Start: Pick Your Path

Your write-off path depends on how your business is structured and how it reports income. Sole proprietors on the accrual method and incorporated businesses can generally claim a bad-debt deduction once CRA’s tests are met. Sole proprietors on the cash method typically cannot, because the unpaid invoice was never reported as income. HST/GST registrants have a separate recovery path under the Excise Tax Act.
Sole proprietor — accrual
Claim on Form T2125, line 8590.
Sole proprietor — cash
No deduction; the income was never reported.
Incorporated small business
Claim through the corporate books and reconcile on T2 Schedule 1.
HST/GST registrant
Recover the tax portion under Excise Tax Act s. 231, within two years.

Our tax planning group can map your specific situation before you make any entries.

ClearWealth Accounting Advisors
How the Bad-Debt Deduction Differs by Business Structure
Where to report the write-off, the income-inclusion requirement, HST adjustment, and reserve eligibility.
Entity Type Filing Form Line / Schedule Income Inclusion Required HST/GST Recovery Doubtful-Debt Reserve
Sole proprietor (accrual)T2125Line 8590Yes — prior or current yearAvailable (s. 231)Available (s. 20(1)(l))
Sole proprietor (cash)T2125Not applicableNo income reported, no deductionGenerally not applicableNot applicable
Canadian-controlled private corporationT2Operating expense · Schedule 1YesAvailable (s. 231)Available (s. 20(1)(l))
Professional corporationT2Operating expense · Schedule 1Yes · extra scrutiny on related-party debtsAvailable (s. 231)Available (s. 20(1)(l))
Source: Canada Revenue Agency — Business expenses: Bad debts (canada.ca). ClearWealth Accounting Advisors · clearwealth.tax · For informational purposes only.

When CRA Considers a Debt "Bad" Versus Just "Overdue"

A debt is "bad" for tax purposes when the business reasonably concludes, based on evidence, that it has become uncollectible in the year. Being overdue — even by many months — is not the same thing. CRA applies a reasonableness test, and the taxpayer carries the burden of showing that collection has been genuinely pursued and that further efforts would not be economic.

Income Tax Act s. 20(1)(p) is the operative rule. It permits a deduction for a debt established to have become bad in the year, provided the amount was previously included in computing income. The CRA’s Income Tax Folio S4-F11-C1 adds colour — collection letters, phone follow-ups, demand notices, a bankruptcy notice, or confirmation the customer has ceased trading are the kinds of evidence that generally support a claim.

There is also a middle category. A "doubtful debt" is one that may become uncollectible but has not yet crossed the line. Under s. 20(1)(l), businesses can claim a reserve for doubtful debts, deferring tax on a reasonable estimate. The reserve must be added back to income the next year and re-evaluated.

ClearWealth Accounting Advisors
From Invoice Issued to Bad-Debt Deduction — The Canadian Timeline
Typical collection gates and the documentation CRA generally expects at each step.
Overdue
30–60 days
Doubtful
60–120 days
Bad debt
120+ days + evidence
Source: CRA Income Tax Folio S4-F11-C1. ClearWealth Accounting Advisors · clearwealth.tax · For informational purposes only.

Sole Proprietor Versus Corporation: Where the Deduction Lands

The underlying tax rule is the same, but where you report the write-off differs. For most Ontario-incorporated small businesses, the deduction lowers taxable income reported on the T2 corporate return. Our corporate tax filing team typically flags this item during year-end adjusting entries rather than at filing, so the bookkeeping, HST return, and T2 all tell the same story.

Step-by-Step: How to Write Off an Unpaid Invoice on Your Canadian Tax Return

Five steps generally take an aged invoice from your ledger to a deductible bad debt. Confirm income inclusion, document reasonable collection efforts, journal the write-off in the books, claim the deduction on the correct line of your T2125 or T2, and adjust HST/GST on your next return. Keep every piece of supporting paper — CRA can request it years later.
  1. 1
    Confirm the invoice was included in incomeThe deduction only works if the revenue was previously reported — on last year’s return, this year’s year-to-date, or a prior fiscal period. No income inclusion, no deduction.
  2. 2
    Document your collection effortSave the invoice, every statement, every reminder email, every call log, and any demand letter. If the customer has gone out of business or filed for bankruptcy, keep the corporate search or trustee notice.
  3. 3
    Journal the write-offDebit bad-debt expense; credit accounts receivable. If you carry an allowance for doubtful accounts, the entry hits that account first. Keep the write-off date in the same fiscal year you intend to claim.
  4. 4
    Claim the deductionSole proprietors enter the amount on Form T2125, line 8590 "Bad debts." Corporations include it in operating expenses and reconcile on T2 Schedule 1 where needed.
  5. 5
    Adjust the HST/GSTIf you remitted sales tax on the original invoice, recover it on your next GST/HST return. Our HST/GST filing support team sees this step missed more often than any other.

Recovering the GST/HST You Already Remitted

Excise Tax Act s. 231 generally allows a GST/HST registrant to recover the tax portion of a bad debt by claiming an adjustment on line 108 of the GST/HST return. The claim is available for two years after the end of the reporting period in which the write-off occurred. If the customer later pays, the adjustment reverses.

Many Ontario SMEs discover this rule years into their business. The adjustment is not automatic and is not triggered by the income-tax write-off; it must be claimed on the GST/HST return itself. Quebec businesses follow a parallel QST process administered by Revenu Québec.

Common Mistakes Canadian Business Owners Make

  • →Writing off an invoice before the reasonableness test is met, then having the deduction reversed on audit.
  • →Claiming the income-tax deduction but forgetting the HST/GST adjustment, leaving money with CRA for no reason.
  • →Missing the two-year window for the HST/GST recovery and losing the tax portion permanently.
  • →Using the cash method of accounting and claiming a bad-debt deduction on income that was never reported.
  • →Skipping the paper trail — no call logs, no demand letter, no customer-search printout — and failing an audit despite a legitimate write-off.
  • →Writing off a related-party receivable without flagging the non-arm’s-length nature of the transaction; CRA scrutinizes these closely.
  • →Double-claiming after a surprise payment: once written off, a later recovery must be re-included in income.

If you are facing a CRA review on any write-off already claimed, our CRA audit support team can help you assemble the file.

What Happens If the Customer Eventually Pays

Under Income Tax Act s. 12(1)(i), a recovery of a previously written-off bad debt is included in income in the year it is received. The corresponding HST or GST, if recovered under s. 231, is also re-remitted on that period’s return. The original deduction stands; the recovery is treated as new income.

In practice this means that a late payment on a written-off invoice does not trigger a reopened prior return. It is simply reported in the current year and the matching sales-tax adjustment is undone.

Frequently Asked Questions

Can I write off an invoice my customer just refuses to pay?

Refusal to pay is not, on its own, enough. The debt must be shown to be uncollectible in the year, which generally means documented collection attempts, a demand letter, or evidence that further effort would not be economic. If those steps are in place, the write-off is typically supportable.

How long should an invoice be overdue before CRA considers it a bad debt?

There is no bright-line number of days. CRA applies a reasonableness test rather than a fixed age. Most small businesses conclude that an invoice is uncollectible after 90 to 180 days of documented, unsuccessful collection effort, but the test is about evidence, not the calendar.

Do I need to send the account to collections before I write it off?

A formal collections referral is not required. CRA looks for evidence that collection was pursued in a reasonable way for the size of the debt. For a small invoice, phone calls and written demands may be enough; a larger receivable may warrant legal action or a collections agency.

Can I get back the HST or GST I already paid on an invoice that was never paid?

Generally yes, under Excise Tax Act s. 231. You claim the tax portion as an adjustment on line 108 of your GST/HST return, typically within two years of the reporting period in which you wrote the debt off. If the customer later pays, the adjustment reverses.

What happens if I write off an invoice and then the customer finally pays?

The recovery is included in income in the year it is received, under Income Tax Act s. 12(1)(i). The HST/GST portion, if previously recovered, is re-remitted on the same period’s return. The original write-off is not reopened.

Can a sole proprietor on the cash method claim a bad debt deduction?

No. The deduction under s. 20(1)(p) is only available where the amount was previously included in income. Cash-method filers report income when it is received, so an unpaid invoice was never recorded as revenue and there is nothing to deduct.

What documents does CRA expect to see if I am audited on a bad-debt write-off?

Typically the original invoice, aged receivables listing, copies of reminder notices, call logs, any demand letter, a customer corporate search or bankruptcy notice if applicable, and the journal entry recording the write-off. The paper trail, not the amount, decides most audits.

Can I write off an unpaid invoice from a family member’s business or a related company?

Related-party bad debts are not disallowed, but they draw heightened CRA attention. The same reasonableness test applies, and documentation needs to show the transaction was genuinely commercial. Professional review before the write-off is strongly recommended.

Talk to a ClearWealth Advisor Before You Write Off

A clean bad-debt write-off requires the right timing, documentation, and return lines. Book a consultation and have an Ontario accountant look at your receivables before December 31.

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This article is for informational purposes only and does not constitute tax or financial advice. Consult a qualified accounting professional before making any tax or financial decisions.

Sources & References