How to Write Off a Failed Investment in a Private Company

To write off a failed investment in a private company, you first have to show the investment became completely worthless in a specific tax year, then claim the loss under the rule that fits how you invested: Section 1244 for qualifying small business stock (an ordinary loss against any income, up to $50,000 single or $100,000 joint), the general worthless securities rule for other stock (a capital loss capped at $3,000 a year against ordinary income), Section 165 abandonment rules for LLC or partnership interests, or the bad debt rules if you made a loan rather than buying equity. Which bucket applies is usually decided by how the investment was structured when you wrote the check, not by anything you can fix at the end.

Step One: Prove the Investment Is Worthless, and Pin Down the Year

A drop in value is not enough. The IRS requires that the investment be completely worthless, with no realistic chance of any future recovery.¹ For corporate stock, federal tax law treats worthless shares as sold for zero dollars on the last day of the tax year, which fixes your holding period as long-term or short-term.²

You need a concrete event to anchor the loss to a year. A final bankruptcy ruling that leaves nothing for shareholders, a full liquidation, or a formal dissolution all work. Courts have also allowed the claim without one dramatic event when a company was clearly insolvent with no path forward. The harder question is almost never whether the investment is dead, but exactly when it died.

Timing is where investors get tripped up. You must claim the loss in the year it actually became worthless. If the company truly collapsed in 2024 and you first claim the deduction on your 2026 return, the IRS can deny it. Because private company shares don’t have a public price falling to zero on a public date, you have to build the proof yourself: final financial statements, correspondence from any receiver or liquidator, corporate dissolution records, and anything else showing no remaining value.

Section 1244: Ordinary Loss Treatment for Small Business Stock

Without a special rule, a worthless stock loss is a capital loss. Capital losses first offset any capital gains, then up to $3,000 of other income ($1,500 if married filing separately), with the rest carrying forward at the same annual limit.³⁴ A $200,000 loss with no offsetting gains would take more than 60 years to deduct at that pace.

Section 1244 is the escape hatch. It converts the loss on qualifying small business stock into an ordinary loss that offsets wages, self-employment income, interest, dividends, and anything else on your return, dollar for dollar.⁵ Two sets of tests have to pass. Miss either, and the loss reverts to capital treatment.

The Company Tests

The corporation must be domestic. At the time your stock was issued, the aggregate money and property the corporation had received for all of its stock (including contributions to capital and paid-in surplus) cannot have exceeded $1 million.⁵ The threshold is tested at issuance, not at the loss. A later $5 million round doesn’t automatically kill treatment for earlier shares issued when the total was still under $1 million.

The corporation also has to pass an active business test. For the five tax years before the loss year, more than half of its total revenue must have come from active business operations rather than passive sources such as rent, royalties, dividends, interest, annuities, or gains from stock and securities sales.⁵ A holding company won’t qualify. If the company existed for fewer than five years, the test looks at however many years it operated.

The Investor Tests

You have to be an individual, and you have to be the original purchaser of the stock. Shares you inherited, received as a gift, or bought from another investor on the secondary market are out. Stock issued to a partnership qualifies too, but the ordinary loss flows through to the individual partners.⁵ Corporations, trusts, and estates cannot claim the ordinary loss no matter how they acquired the stock.

You must have received the stock in exchange for money or property you transferred to the company. Stock received as compensation for services does not qualify,⁶ which catches founders who took sweat-equity shares.

The Annual Cap

Section 1244 caps the ordinary loss at $50,000 a year for single filers and $100,000 for joint filers.⁵ Anything above the cap becomes a capital loss subject to the ordinary $3,000 rule and carryforward. If you invested $180,000 and file jointly, $100,000 offsets ordinary income and the remaining $80,000 is a capital loss.

Startup Structures That Quietly Disqualify You

Several common startup investment structures fail Section 1244 in ways that only surface at loss time:

Preferred stock is not eligible. Section 1244 applies only to common stock, so shares carrying liquidation preferences, anti-dilution rights, or conversion rights don’t qualify. This is the single most common disqualifier for angel and venture investors.
Convertible notes create a problem. Stock issued to cancel a debt qualifies only when the debt is not itself a security, and a promissory note is generally considered a security, so shares received on note conversion likely fail the money-or-property requirement.⁶
SAFEs are not debt, but the shares eventually issued under a SAFE still have to independently meet every Section 1244 requirement at the time of issuance. If those shares are preferred, they’re out.
Stock held through an S corporation cannot produce a Section 1244 ordinary loss for the S corporation or its shareholders. Only individuals holding directly (or through a partnership) qualify.

The planning has to happen when you make the investment, not when the company fails. If you want the downside protection, insist on common stock issued directly to you in exchange for cash.

If You Invested in an LLC or Partnership Instead

Section 1244 doesn’t apply to LLC membership interests or partnership interests, because they aren’t stock. A worthless or abandoned partnership interest can produce a deduction under the general loss rule of Section 165.² To claim abandonment, you have to show you intended to give up the interest permanently and took an affirmative step, such as a written notice to the partnership.

Whether that loss is ordinary or capital turns on one factor: whether any of the partnership’s debts were allocated to you when you walked away. Debt relief is treated as a deemed cash payment, which converts the abandonment into a sale, and sales of partnership interests produce capital losses. With no allocated liabilities, there is no deemed sale, and the loss is ordinary. In some situations it can be worth contributing cash to pay off allocated debt before abandoning, so the abandonment stays ordinary.

If You Lent Money to the Company

Loans follow the bad debt rules. When the debt becomes completely worthless, you can claim a bad debt deduction.⁷ The character depends on whether the debt is a business or nonbusiness bad debt, tested by the “dominant motivation” for making the loan. Unless the loan was primarily connected to your own trade or business (protecting your job at the company, for instance), it’s nonbusiness.

A nonbusiness bad debt is treated as a short-term capital loss no matter how long the debt was outstanding,⁷ so it lands in the same $3,000-a-year bucket as other capital losses. The debt has to be entirely uncollectible; partial worthlessness is available only for business bad debts. A signed promissory note, stated interest, documented collection efforts, and a bankruptcy filing by the borrower all strengthen the claim and help show the loan wasn’t a disguised gift.

Passive Activity Rules: Roadblock and Release Valve

If you weren’t materially involved in the company’s operations, your interest was probably a passive activity, and passive losses can generally only offset passive income. The offset works the other way at worthlessness, though: a full disposition of a passive activity releases all previously suspended losses, which then become deductible against any type of income.⁸ A complete worthlessness event counts as that disposition and can unlock years of trapped losses. If you actively participated, this restriction generally doesn’t apply in the first place.

Reporting the Loss

The form depends on the classification.

A Section 1244 ordinary loss goes on Form 4797, Sales of Business Property. Enter it on line 10 with the description “Losses on Section 1244 (Small Business Stock),” and attach a computation showing how you calculated it. Any amount above the $50,000 or $100,000 cap moves over to Schedule D as a capital loss.⁹

Capital losses (worthless securities that don’t qualify under Section 1244, and nonbusiness bad debts) go on Form 8949, with totals carried to Schedule D of Form 1040.¹⁰ Schedule D applies the $3,000 annual limit and calculates any carryforward.¹¹ Use the last day of the tax year as the sale date on Form 8949, because that’s how the tax code treats the deemed disposition of a worthless security.² That date sets the holding period: bought more than a year before December 31 of the worthless year is long-term; otherwise short-term.

Documentation to Hold On To

None of this gets filed with your return, but the IRS can request any of it later. Keep the following indefinitely:

Purchase records, including your subscription agreement, wire confirmations, side letters, and stock certificates, showing you were the original buyer and what you paid.
Section 1244 qualification proof: articles of incorporation, the cap table at the time of your issuance showing total money raised, and financial records covering the active business test.
Proof of worthlessness: final financial statements, bankruptcy court filings, state dissolution records, and any correspondence confirming no remaining assets for shareholders.
Timing evidence showing the stock was not already worthless in an earlier year. This is what the IRS challenges most often.

The Seven-Year Amendment Window

Because worthlessness dates are so hard to pin down, Congress gave taxpayers a longer runway. Instead of the standard three years for amending a return, you have seven years from the original filing deadline to file an amended return claiming a worthless securities deduction or a bad debt deduction.¹² File the amendment on Form 1040-X.¹ If you realize now that a company you invested in was actually worthless two or three years ago, that window lets you go back and claim the deduction in the correct year, which is by far the most common thing investors get wrong with worthless stock.

1
Internal Revenue Service. Publication 550, Investment Income and Expenses
2
Office of the Law Revision Counsel. 26 U.S. Code 165 – Losses
3
Office of the Law Revision Counsel. 26 USC 1211 – Limitation on Capital Losses
4
Office of the Law Revision Counsel. 26 USC 1212 – Capital Loss Carrybacks and Carryovers
5
Office of the Law Revision Counsel. 26 U.S. Code 1244 – Losses on Small Business Stock
6
eCFR. 26 CFR 1.1244(c)-1 – Section 1244 Stock Defined
7
Office of the Law Revision Counsel. 26 USC 166 – Bad Debts
8
Office of the Law Revision Counsel. 26 USC 469 – Passive Activity Losses and Credits Limited
9
Internal Revenue Service. Instructions for Form 4797
10
Internal Revenue Service. About Form 8949, Sales and Other Dispositions of Capital Assets
11
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
12
Office of the Law Revision Counsel. 26 U.S. Code 6511 – Limitations on Credit or Refund