Worthless or Abandoned Securities: When Can You Claim a Tax Loss?

The direct answer

A security that merely lost most of its value is not necessarily deductible as a worthless security.

For IRC §165(g) to apply, a qualifying security generally must become wholly worthless during the tax year. When it does, the security generally is treated as though it were sold or exchanged on the last day of that tax year.

A qualifying abandonment can also produce §165(g) treatment, but abandonment requires more than deciding that an investment is no longer worth pursuing. The taxpayer must permanently surrender and relinquish all rights in the security and receive no consideration in exchange.

A severe decline is not the same as complete worthlessness

The controlling distinction is not whether an investment has become a disaster.

It is whether the security became wholly worthless.

A collapse in market value, delisting, suspended trading, financial distress, or even a bankruptcy filing does not automatically establish the deduction or its year.

The relevant facts must establish that the security had no remaining value in the year for which the loss is claimed.

That makes worthlessness different from an ordinary sale at a loss. With a sale, the disposition date is usually visible. With a worthless security, the taxpayer may need to prove when the economic loss crossed the legal threshold for §165(g).

That factual timing can become the hardest part of the case.

Why the year of worthlessness matters

Section 165(g) supplies a deemed-disposition rule.

When a qualifying capital security becomes wholly worthless during a taxable year, it generally is treated as sold or exchanged on the last day of that year.

For a calendar-year taxpayer, a security established to have become wholly worthless during 2026 generally has a deemed disposition date of December 31, 2026.

That date matters for two reasons.

First, it places the loss in a particular tax year.

Second, it affects whether the resulting capital loss is short-term or long-term.

The taxpayer therefore cannot simply claim the loss in whichever later year the worthlessness is discovered. The relevant year is the year the security actually became wholly worthless.

Example: stock becomes wholly worthless in 2026

Assume an investor acquired investment stock for $25,000 in 2024.

The facts establish that the stock became wholly worthless during 2026. Assume the $25,000 basis has not otherwise been adjusted.

Under §165(g), the stock is generally treated as sold or exchanged on December 31, 2026.

Adjusted basis: $25,000
Deemed proceeds: $0
Capital loss: $25,000

Because the security was held for more than one year through the deemed disposition date, the loss is generally long-term.

That establishes the loss.

It does not mean the investor necessarily deducts $25,000 against ordinary income in 2026. The loss then enters the capital-loss netting and limitation system explained in Capital Losses and Carryovers.

Bankruptcy does not automatically fix the year

Bankruptcy can be powerful evidence.

It is not a universal tax trigger.

A company can enter bankruptcy while shareholders still retain some possibility of value. In another case, the facts may establish that the equity became wholly worthless before a formal bankruptcy proceeding concluded.

Likewise, delisting does not by itself establish complete worthlessness.

And a security still trading for a nominal amount is not automatically treated as wholly worthless simply because its price is extremely low.

The tax question remains factual:

When did the security cease to have value for purposes of §165(g)?

Relevant evidence can include the company's financial condition, bankruptcy or liquidation proceedings, cancellation of equity, distributions or expected distributions, restructuring documents, trading history, and other identifiable events bearing on whether shareholder value remained.

Abandonment requires an affirmative surrender of rights

A taxpayer does not always need to wait passively for a security to become worthless.

Treas. Reg. §1.165-5(i) addresses abandonment of securities.

For a qualifying abandonment, the taxpayer must permanently surrender and relinquish all rights in the security and receive no consideration in exchange.

That is different from:

• deciding not to monitor the investment anymore;
• mentally writing it off;
• moving it to an inactive account; or
• simply holding stock that appears economically hopeless.

A valid abandonment requires an actual relinquishment of the ownership rights contemplated by the regulation.

Abandonment does not automatically create an ordinary loss

For a security within §165(g), a qualifying abandonment is generally brought into the worthless-security regime.

That means abandonment should not be described as a generic technique for converting a failed investment into an ordinary deduction.

The nature of the property and any specialized statutory exception still matter.

One important example is qualifying §1244 stock, which can receive specialized ordinary-loss treatment when the statutory requirements are met.

That is a separate analysis. The fact that private-company stock failed does not itself establish §1244 eligibility.

Debt can raise a different question

Not every failed investment instrument is stock.

Section 165(g) contains a statutory definition of securities, and failed debt can raise questions involving both worthless-security and bad-debt rules depending on the instrument and facts.

The correct classification should therefore be established before assuming that the stock-loss framework applies.

This becomes particularly important with founder loans, convertible instruments, private notes, and other investments whose debt-or-equity character may not be obvious from the account statement.

What records can prove worthlessness?

The burden is not merely to prove that the investment performed badly.

The documentation should support complete worthlessness and the year in which it occurred.

Depending on the investment, useful evidence can include:

• bankruptcy filings and court orders;
• liquidation or dissolution documents;
• capitalization and shareholder records;
• cancellation notices;
• financial statements;
• restructuring documents;
• evidence concerning expected shareholder recoveries;
• brokerage statements and trading records;
• correspondence from the issuer or liquidator; and
• records supporting the taxpayer's adjusted basis.

For an abandonment, retain evidence showing the affirmative surrender of the security and the absence of consideration.

Worthless-security refund claims have a special limitations rule

Worthless securities are unusual because Congress provides a special limitations period for certain refund claims.

Under IRC §6511(d)(1), a claim for credit or refund relating to an overpayment attributable to a worthless security can use a seven-year period measured from the date prescribed by law for filing the return for the year with respect to which the claim is made, determined without regard to filing extensions.

The applicable two-year-from-payment period can still control if it expires later.

The seven-year period does not begin when the taxpayer discovers that the security was worthless. It is tied to the prescribed filing date for the relevant loss year.

That distinction matters when later evidence shows that a security actually became worthless in an earlier year.

A taxpayer may have an extended opportunity to claim a refund attributable to the worthless-security loss, but the extended claim period does not move the substantive loss into the discovery year.

Reporting comes after the loss year is established

Once the taxpayer has determined that a qualifying security became wholly worthless in a particular year, the deemed disposition must be reflected on the return under the applicable reporting framework.

The exact Form 8949 mechanics should be checked against the instructions for the relevant filing year.

See Form 1099-B and Form 8949 for return reconciliation and reporting mechanics.

Then see Capital Losses and Carryovers for how an established capital loss is absorbed by the rest of the return.