Failed US Startup: Claiming the Loss on Your Canadian Return

Can I deduct a loss on Delaware startup shares on my Canadian return?

Yes, as a capital loss. When the shares are disposed of, or deemed disposed of, for nil, the loss equals what the shares cost you in Canadian dollars. 50% of it is an allowable capital loss, which offsets taxable capital gains only, not salary or business income (section 39; CRA Guide T4037).

Three things make a case not simple:

• Timing. No loss exists until a disposition: the company dissolves, you sell the shares at arm's length, or you make the subsection 50(1) election in a year the conditions are met.
• Two countries. The US company has its own final filings, and Canada wants your foreign reporting for the closing year.
• Who owns it. If your Canadian holding company owned the shares, the loss is the company's, with its own rules.

Gather: share purchase records, wire confirmations, any loan or SAFE agreement, the board resolution to dissolve, the certificate of dissolution, and the company's final balance sheet.

Is it an allowable business investment loss or only a capital loss?

Only a capital loss. An allowable business investment loss (ABIL), which can be deducted from any income, needs a share of a small business corporation or a debt owed by a Canadian-controlled private corporation (section 39(1)(c)). A small business corporation must be a Canadian-controlled private corporation (section 248(1)), and that must be a "Canadian corporation" (section 125(7)).

A Canadian corporation must be resident in Canada and, for any startup formed in recent decades, incorporated in Canada (section 89(1)). A Delaware corporation fails that test even if every founder lived in Canada and ran it from here.

When can I claim it: when the company dissolves, or earlier by election?

Either. Pick the year that matches the facts, and claim the loss only once.

The subsection 50(1) election deems you to have sold the shares for nil at the end of the year and reacquired them at nil. At the end of that year:

1. the company is insolvent;
2. neither it nor a company it controls carries on business;
3. the shares are worth nil; and
4. it is reasonable to expect the company will be dissolved or wound up and will not start business again.

The CRA asks for a signed letter, attached to the return, stating that you want subsection 50(1) to apply (Guide T4037). If you missed it, you can ask the CRA within ten calendar years after that year to accept a late election; acceptance is at its discretion (subsection 220(3.2)). If the company, or one it controls, carries on business again within 24 months while you or a non-arm's-length person still own the shares, you are deemed to have sold the shares at their original cost, which reverses the loss (subsection 50(1.1)).

A sale to your spouse, your own corporation or another affiliated person can turn the loss into a denied superficial loss (section 40(2)(g)).

What about money I lent the company, or a SAFE I bought?

A loan the company cannot repay is a capital loss in the year you establish it became a bad debt, by electing under subsection 50(1); it is not an ABIL, because the borrower is not a Canadian-controlled private corporation. The CRA treats a debt as bad when it remains unpaid after you have exhausted all ways to collect it, and asks for a signed election letter with the return (Guide T4037).

One condition can wipe out a loan loss: a loss on a debt is nil unless you acquired the debt to earn income from a business or property (section 40(2)(g)(ii)). An interest-free loan to your own startup puts that test in question, and the answer depends on the facts. Keep the loan agreement and anything showing why you lent.

A SAFE is harder. The Income Tax Act has no rule written for SAFEs, and the election in subsection 50(1) covers only debts and shares. Whether a SAFE is a debt, a right to receive an amount or something else depends on its terms, and that decides when the loss arises and whether the debt rule above applies. Treat a SAFE loss as a judgment call. For cash left over to pay SAFE holders, see returning cash to investors.

How do I work out the loss in Canadian dollars?

Convert each amount at the Bank of Canada rate for the day it arose (section 261(2)). Each share purchase and each loan advance uses its own date's rate; anything you get back uses the rate on the day you receive it.

• Cost of shares: what you paid, plus any amount already taxed as an employment benefit when you got the shares (section 53(1)(j)). For how vesting founder shares are taxed, see vesting US startup shares.
• Proceeds: nil on an election or a dissolution with nothing paid out.
• Exchange rate: the loss in Canadian dollars can be larger or smaller than the US-dollar loss, because each amount uses a different day's rate.

Report the loss on Schedule 3 of your return.

How do I use a capital loss if I have no gains this year?

An unused allowable capital loss becomes a net capital loss. It can be carried back to the three preceding tax years or forward with no time limit, but only against taxable capital gains (section 111(1)(b)). To carry it back, complete Form T1A rather than amending the earlier return (Guide T4037).

Do I file a final T1134 or T1135 for the year the company closes?

Usually one of them, but not both for the same company.

The T1135 test uses cost, not value, so worthless shares still count during the closing year. The T1134 is due 10 months after your tax year ends. If your cost of the interest was under C$100,000 and the company was dormant (gross receipts under C$100,000 and assets never over C$1,000,000), you file the T1134 summary with base information but no supplement for it (Form T1134 instructions). For the tests in full, see foreign property and affiliate reporting. If earlier years' T1134s were never filed, see missed T1134 for a US company before you file the final one.

What if my Canadian holding company owned the shares?

Then the loss belongs to the holding company, not to you. The holding company claims the capital loss on its own return, can make the subsection 50(1) election itself, and files the final T1134 for the year the US company dissolves. The loss cannot move to your personal return.

A corporation's loss on shares of a foreign affiliate can be reduced by tax-exempt dividends it or related companies received on those shares (section 93(2.01)). Have that checked before filing. For the trade-offs of owning through a holding company, see holding startup shares through a Canadian holding company.

What does each country need, in what order, to close it?

The US company's final filings come first, and your Canadian claim follows in the dissolution year; an election under subsection 50(1) can bring the claim forward to before the company closes. The company's US tax and penalties are generally the company's, but unpaid withheld payroll taxes can bring the Trust Fund Recovery Penalty on the people responsible (IRS). For what a founder can still owe personally, see closing a US corporation from abroad.

A founder who is a US citizen or green card holder also has a US loss to claim; see deducting shares in a failed startup.

Example

These examples are illustrative. Amounts are in US dollars converted to Canadian dollars (C$) at assumed rates.

Shares and a loan, claimed by election

A Calgary founder paid US$50,000 for her shares when the rate was 1.30 (C$65,000) and lent the company US$30,000 at 1.40 (C$42,000) under a loan agreement that charged interest.

• 2026: The company stops operating, insolvent with no assets, and dissolution is expected. She elects under subsection 50(1) for both the shares and the loan. Capital loss: C$107,000; allowable capital loss: C$53,500. She owns over 10%, so she files a T1134 for 2026, not a T1135.
• 2026 return: She applies the loss against taxable capital gains she reported in 2023 to 2025 on Form T1A, and carries the rest forward.
• 2027: The company is dissolved. She files a final T1134 for 2027 and claims no second loss.

No gains to use

Same founder, but she has no capital gains in 2023 to 2026. The C$53,500 net capital loss waits. In 2029 she sells a rental condo with a C$40,000 taxable capital gain and deducts C$40,000 of the loss. C$13,500 carries forward to the next gain, such as a later startup exit.

Holding company owned 40%

An Ottawa founder's holding company, with a December 31 year-end, owned 40% of a Delaware startup that dissolves in 2026. The holding company claims the capital loss on its 2026 return and files a final T1134 for that year. The founder's personal return shows no loss.

Different for you?

• The company never filed Form 5472 or its US returns: see closing a US corporation from abroad and get cross-border tax help.
• You are a US citizen or green card holder living in Canada: your US loss, including section 1244, is in deducting shares in a failed startup; claiming in both countries needs cross-border tax help.
• You lent interest-free or hold a SAFE: the loss may be denied or fall in a different year; get cross-border tax help.
• T1134 was missed in earlier years: see missed T1134 for a US company.
• Cash is left for investors: see returning cash to investors.
• The company is Canadian, not American: see closing a Canadian corporation; its shares may qualify for an ABIL.