Business Losses: Using Them Now, Back or Forward

Can my sole-proprietor loss reduce my T4 salary or other income this year?

Yes, a genuine sole-proprietor business loss generally enters the same personal return as your T4 salary and can reduce your other income for the year. Report the business's gross income, allowable expenses, and net loss on Form T2125 and the applicable self-employment lines of your T1; do not claim an expense merely because you paid it (CRA: self-employment income and loss; CRA: T4002 losses).

The current-year loss first meets your other income on that return. If you still have an eligible loss after that calculation, the unused amount may become a non-capital loss for another year. A loss does not itself guarantee a refund: tax already paid, other deductions, and your final taxable income determine the result (CRA: T4002 losses). For which expenses belong on T2125, see How self-employed income is taxed.

Does a partnership loss flow to me, and are limited partners restricted?

An ordinary partnership calculates its loss and allocates each partner's share; an individual partner reports that share on their own return. A partner treated as a limited partner for tax purposes can generally use only the loss allowed by their at-risk amount, after the specified adjustments. This can include a partner whose liability is limited by contract. The restricted remainder is a limited partnership loss, which follows different rules from an ordinary non-capital loss (CRA: T5013 guide; Income Tax Act, section 96).

Do not treat a limited partnership loss as an unrestricted deduction against T4 salary. The restricted amount cannot be carried back; it carries forward until that partnership's at-risk amount permits a deduction. Keep the at-risk calculation with the slip (CRA: T5013 guide; CRA: Form T1A).

In Quebec, partners also report their share on Schedule L using the RL-15 slip or partnership records. A specified member with a loss must complete Schedule N, which can restrict the Quebec deduction (Revenu Québec: line 164; Revenu Québec: line 260).

Can my corporation's loss reduce my personal tax?

No. A corporation's business loss belongs to the corporation and cannot be placed on its shareholder's T1 to offset T4 salary or other personal income. The corporation calculates and tracks its losses on its T2 and Schedule 4, and may apply an eligible loss against its own income in another year (CRA: T2 guide, losses).

If you expect early losses and are deciding whether to incorporate, compare the structures in Sole proprietorship or corporation. If the corporation already exists, the relevant question is whether it has taxable income in an allowed carryback or later year, not whether you paid personal tax.

Can I claim costs when the business had no sales?

Yes, a business can have deductible expenses in a year with no sales after it has actually started. The CRA looks for a significant activity that is a regular part of the business or necessary to get it going. Mere research into a possible business is different; buying goods for resale or equipment to begin operating may mark the start. Record what happened and when, because the start date depends on the facts (CRA: T4002, when business starts).

An expense still needs a business purpose, proper timing, and the right tax treatment. Personal expenses do not qualify, and the cost of a capital asset is not automatically a current expense (Income Tax Act, section 18). For an individual business, business use of home expenses cannot create or increase a business loss; unused qualifying home expenses may carry forward for use against income from that same business while the conditions continue to be met (CRA: business use of home folio).

How many loss years can I report before the CRA questions the business?

There is no fixed number of loss years that automatically turns a business into a hobby. The CRA asks whether the activity was genuinely pursued for profit; repeated losses can make the underlying evidence more important, especially where the activity has a personal element (CRA: Income Tax Audit Manual, pursuit of profit).

The CRA's audit guidance looks at matters such as efforts to find customers, pricing, expense control, training, financing, business organization, and the reasons losses continued. A poor result or bad business decision alone does not prove there was no business. But evidence that an activity was pursued for tax losses rather than profit can undermine the claim (CRA: Income Tax Audit Manual, pursuit of profit).

When does an unused business loss become a non-capital loss?

For an individual, the ordinary business loss first reduces other income in the loss year. If the allowable loss exceeds that income, the unused balance may be a non-capital loss; Form T1A calculates the amount available to move to another year. A business's accounting loss is not automatically the same as its tax loss because tax adjustments and restrictions can change it (CRA: T4002 losses).

Farm, fishing, capital, and allowable business investment losses can have distinct calculations or limits. Confirm the loss type before using the ordinary non-capital loss rules (CRA: line 25200).

How do I carry an individual non-capital loss back or forward?

An eligible individual non-capital loss can generally go back three tax years or forward 20 tax years. To request a carryback, complete Part 2 of Form T1A for the loss year, sign it, and send it with that year's return or separately; do not amend the earlier year's return just to apply the carryback (CRA: Form T1A). If the earlier return was filed, filing by the loss-year return deadline makes reassessment mandatory—normally June 15 for a self-employed filer, though some returns are due April 30. For a late request, the ordinary reassessment window ends three years after the earlier year's normal reassessment period ends (Income Tax Act, section 152; CRA: taxpayer-requested adjustments). Claim a prior year's available non-capital loss on line 25200 when carrying it forward (CRA: T4002 losses; Income Tax Act, section 111).

Check the notice of assessment or reassessment for the available balance and record how much of each loss year has already been used. Apply older losses of the same type before newer ones. A carryback can change the earlier year's tax result, while a carryforward waits for a later year with taxable income; choosing the years and amounts warrants care if multiple years or deductions are involved (CRA: line 25200; Income Tax Act, section 111).

Quebec residents also report a business loss on provincial Schedule L, claim a prior-year non-capital loss on line 289, and file Form TP-1012.A-V separately with Revenu Québec to carry a loss back (Revenu Québec: line 164; Revenu Québec: line 289).

How does a corporation use Schedule 4 to carry a loss back or forward?

If a current non-capital loss reduces income in an earlier year when the corporation paid tax, the reassessment may produce a refund to the corporation. Part 1 of T2 Schedule 4 calculates the current loss and requests a carryback on lines 901 to 903; Part 6 tracks balances by loss year. In a later profitable year, claim an available prior-year non-capital loss on T2 line 331 and record its use on Schedule 4. The ordinary period is three prior tax years or 20 later tax years. If the earlier T2 was filed, send the carryback request with the loss-year T2 or send Schedule 4 separately to the tax centre by six months after the loss-year tax year-end for a mandatory reassessment. For a late request, the ordinary reassessment window ends three years after the earlier year's normal reassessment period ends (CRA: Schedule 4 form; Income Tax Act, section 152; CRA: taxpayer-requested adjustments).

Start with the corporation's tax-adjusted income or loss, complete the current-year loss calculation, then reconcile losses used, carried back, and left to carry forward. A corporation can choose whether to use an available loss in a year, but it must use the oldest available loss of the same type first. An acquisition of control restricts business losses across the event: they generally remain usable only against income from the same or a similar business that continues for profit or with a reasonable expectation of profit. If the corporation holds eligible appreciated capital property, it may consider a paragraph 111(4)(e) designation to realize a gain before control changes. The corporation makes it on the pre-control return or a prescribed form filed within 90 days after that year's assessment; an authorized officer signs the T2 (CRA: T2 guide; CRA: T2 certification; Income Tax Act, section 111). For preparation of the T2 itself, see Filing your corporate return.

A corporation subject to Quebec income tax also tracks losses on its CO-17 with Schedule CO-17S.4. For a Quebec carryback, it sends Form CO-1012 to Revenu Québec within six months after the loss-year tax year-end (Revenu Québec: corporation return guide).

What records support a loss if the CRA reviews it?

Keep records that show both the amount of the loss and why the activity was a business. The CRA may disallow unsupported expenses, and its pursuit-of-profit review examines what you actually did, not just what you wrote on the return (CRA: T4002 business records; CRA: Income Tax Audit Manual).

• Keep dated invoices, receipts, contracts, bank records, inventory records, and a ledger linking each expense to the business. Separate personal use from business use (CRA: T4002 business records).
• Keep dated evidence of when operations began and of efforts to earn sales: offers, customer contacts, marketing, pricing changes, and a plan you actually used (CRA: T4002 start of business; CRA: Income Tax Audit Manual).
• Keep the T2125, T5013 and at-risk calculation, or the T2 and Schedule 4, as applicable, with notices of assessment and a year-by-year loss balance. Keep records through the years in which the loss is used; the CRA generally requires records for at least six years from the end of the last tax year to which they relate (CRA: T4002 business records).

If a CRA letter disputes the loss, see Reviews, audits and voluntary disclosure for the response process.

Example

Illustrative amounts in Canadian dollars: a sole proprietor has a $30,000 allowable business loss and $50,000 of T4 salary. The loss reduces current-year income to $20,000 before other items on the return. Nothing from that business loss remains to carry back or forward. If the same loss were $70,000, the salary absorbed $50,000; assuming no other T1A adjustments, the remaining $20,000 would be a non-capital loss. A corporation with a $70,000 loss would keep it on its own T2; its shareholder could not use it against their T4 salary (CRA: T4002 losses; CRA: Form T1A; CRA: T2 guide).

Different for you?

• You are choosing a structure before the first loss: compare where losses land in Sole proprietorship or corporation.
• You need to decide whether a particular cost is deductible: see How self-employed income is taxed.
• Your loss or carryback is disputed, substantial, or spans several personal returns: get individual tax help with the T1A, assessments, and supporting books.
• The corporation had profitable years, changed control, or needs a material carryback: get corporate tax help with its T2 returns, Schedule 4, assessments, and ownership history.
• The corporation has unfiled or late T2 returns: see Catching up on unfiled corporate returns before relying on a carryback balance.
• The CRA has already asked for proof of the loss: see Reviews, audits and voluntary disclosure.