How to Write Off a Failed Investment in a Private Company

Writing off a failed investment in a private company starts with proving the investment is completely worthless in a specific tax year, and then getting the loss into the most favorable category the law allows. For stock, that best-case category is an ordinary loss under Section 1244, which offsets your wages and other income dollar-for-dollar up to $50,000 a year (or $100,000 on a joint return). Everything else, including most equity that doesn’t fit Section 1244 and most loans that go bad, drops into capital loss treatment, where you can only deduct $3,000 a year against ordinary income. The classification usually turns on decisions made when you first wrote the check, not on anything you can fix after the company fails.

Proving the Investment Is Worthless and Pinning It to a Year

A struggling company or a plunging valuation is not enough. The IRS requires the investment to be entirely worthless with no realistic chance of recovery.¹ For corporate stock, federal tax law treats worthless shares as sold for zero 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 tying the loss to a specific year: a final bankruptcy ruling that leaves nothing for shareholders, a full liquidation of remaining assets, or a formal dissolution. Courts have allowed claims without a single dramatic event when the company was clearly insolvent with no path forward, but the harder question is almost never whether the investment is dead. It is exactly when it died.

Timing is where most investors slip. The deduction belongs in the year worthlessness actually occurred. If the company collapsed in 2024 and you first claim the loss on your 2026 return, the IRS can deny it. Private companies have no public price hitting zero on a public date, so you build the record yourself: final financial statements, letters from a receiver or liquidator, dissolution filings, and anything else showing nothing remained for equity holders.

Why Capital Loss Treatment Hurts

Unless a special rule applies, a worthless equity investment produces a capital loss. Capital losses first wipe out any capital gains for the year. Whatever is left offsets up to $3,000 of other income ($1,500 if married filing separately), and the rest carries forward.³⁴

The carryforward never expires, but the math is punishing. A $200,000 loss with no offsetting gains takes more than sixty years to absorb at $3,000 per year. That is why the main planning goal for a failed private company investment is usually to get out of capital loss treatment and into ordinary loss treatment.

Section 1244: The Ordinary Loss Route for Stock

An ordinary loss offsets wages, business income, interest, dividends, and any other income without the $3,000 cap. Section 1244 of the Internal Revenue Code is the vehicle that gets you there for stock in a small corporation.⁵ Two sets of tests have to be satisfied, one about the company and one about you. If either set fails, the loss reverts to capital.

What the Company Has to Be

The corporation must be domestic. When your stock was issued, the total money and property the corporation had received for all of its stock, including capital contributions and paid-in surplus, could not exceed $1 million.⁵ The test looks at the cumulative total as of each issuance date, so a later mega-round doesn’t automatically kill shares issued earlier when the company was still under the cap.

The corporation also has to pass an active business test. During the five years before the loss year, more than half of total revenue must have come from active operations rather than passive sources such as rent, royalties, dividends, interest, annuities, or gains on stocks and securities.⁵ A holding company that mainly collects investment income doesn’t qualify. If the company existed for less than five years, the test applies over its actual life.

What You Have to Be

You must be an individual and the original purchaser of the stock. Inherited shares, gifted shares, and secondary-market purchases all fall out of Section 1244. Stock issued to a partnership qualifies, and the ordinary loss flows through to the partners as individuals.⁵ Corporations, trusts, and estates cannot claim the ordinary loss regardless of how they got the shares.

You must have received the stock in exchange for money or property. Stock received as compensation for services doesn’t qualify, which catches founders whose shares came from sweat equity.⁶

The Annual Cap

Section 1244 caps the ordinary loss at $50,000 per year for a single filer and $100,000 for joint filers.⁵ Anything above the cap reverts to capital loss treatment, subject to the standard $3,000 rule and carryforward. If you invested $180,000 and file jointly, $100,000 offsets ordinary income and the remaining $80,000 becomes a capital loss. Still a far better outcome than trapping the whole $180,000 as capital.

Common Disqualifiers in Startup Deals

Several structures that are routine in early-stage investing quietly break Section 1244:

Preferred stock. Section 1244 covers only common stock. Preferred shares with liquidation preferences, anti-dilution, or conversion rights don’t qualify, and this is the single most common trap for angels and venture investors.
Convertible notes. Stock received on conversion of a promissory note likely fails the “money or property” requirement, because the note is generally treated as a security rather than qualifying property.⁶
SAFEs. A Simple Agreement for Future Equity is not debt, but the shares eventually issued must independently meet every Section 1244 requirement at issuance. If those shares are preferred, Section 1244 is off the table.
Stock held through an S corporation. Neither the S corporation nor its shareholders can claim the ordinary loss. Only direct individual holders (or partners in a partnership that holds the stock) qualify.

All of this is planning that has to happen when you write the check, not after the company fails. If you want the downside protection of ordinary loss treatment, insist on common stock issued directly to you in exchange for cash.

If You Held an LLC or Partnership Interest Instead

Many private company stakes are LLC memberships or partnership interests rather than corporate stock. Section 1244 doesn’t apply at all, because those interests aren’t stock.

A worthless or abandoned partnership interest can produce a deduction under the general loss rules of Section 165.² To abandon, you need to show you intended to give up the interest permanently and took an affirmative step to do it, such as written notice to the partnership that you are walking away.

Whether that loss is ordinary or capital turns on one issue: whether any partnership debt was allocated to you at the time of abandonment. If it was, the debt relief is treated as a deemed cash payment, which converts the abandonment into a sale, and sales of partnership interests generate capital losses. With no allocated liabilities, there is no deemed sale, and the loss is ordinary. The partnership’s liability picture is worth analyzing carefully before you abandon anything.

If You Lent the Company Money

Loans follow the bad debt rules. When a debt to a private company becomes completely worthless, you may claim a bad debt deduction.⁷ Character depends on whether the loan is a business or nonbusiness bad debt, and most individual investors fall into the nonbusiness category under the “dominant motivation” test. Unless your primary reason for making the loan was connected to your own trade or business (protecting your job at the company, for example), the debt is nonbusiness.

A nonbusiness bad debt is a short-term capital loss regardless of how long the debt sat outstanding, so it is subject to the same $3,000 annual cap.⁷ The debt has to be entirely uncollectible; partial worthlessness is only available for business bad debts. A signed promissory note, stated interest, documented collection efforts, and a borrower bankruptcy filing all help prove the loan was real and truly uncollectible.

Passive Activity Rules and the Unlock on Worthlessness

Even after character and amount are settled, passive activity rules can slow the deduction down. If you did not materially participate in the business, the investment is likely passive, and passive losses generally only offset passive income.⁸

There is a useful flip side. Disposing of your entire interest in a passive activity releases all suspended losses, and complete worthlessness counts as a full disposition. At that point, previously suspended passive losses become deductible against any type of income.⁸ Years of trapped losses can come loose at the same moment the investment dies.

Reporting the Loss

Which form you use depends on the classification.

A Section 1244 ordinary loss goes on Form 4797 (Sales of Business Property). The IRS instructions direct you to enter the loss on line 10 with the description “Losses on Section 1244 (Small Business Stock),” and it flows to Form 1040 from there. You have to attach a computation showing how the loss was calculated. Any excess above the $50,000 or $100,000 annual cap moves to Schedule D as a capital loss.⁹

Capital losses (including worthless securities outside Section 1244 and nonbusiness bad debts) go on Form 8949, with totals carried to Schedule D of Form 1040.¹⁰¹¹ For worthless securities on Form 8949, use the last day of the tax year as the sale date, matching the deemed disposition rule.² That date determines whether the loss is long-term or short-term, based on when you originally acquired the stock.

What to Keep in Your Files

None of this documentation is filed with the return, but the IRS can ask at any time. Hold onto:

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, a capitalization table as of your issuance date, and financials backing up the active business test.
Worthlessness proof: final financial statements, bankruptcy documents, state dissolution filings, and correspondence from any receiver or liquidator confirming nothing remains for shareholders.
Timing evidence showing the stock was not already worthless in a prior year. This is what the IRS challenges most often.

Keep the file indefinitely. The extended statute of limitations below can leave the IRS looking at the claim seven years after you filed.

You Have Seven Years to Fix the Year

Because pinning down the exact year of worthlessness is genuinely hard, Congress built in a longer amendment window. Instead of the standard three years, you have seven years from the original filing deadline to amend a return claiming a worthless securities deduction or a bad debt deduction.¹² Use Form 1040-X for the amendment.¹ If you realize after the fact that a company you invested in was actually worthless two or three years ago, there is still time to go back and claim the deduction for the correct year, which is the mistake investors make most often 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