A Ponzi scheme loss is money or crypto lost in an investment arrangement that paid purported returns to earlier investors out of later investors' deposits, while reporting profits that were partly or wholly fictitious. The scheme collapses when withdrawals outrun new deposits, and the operator has usually appropriated much of what was invested.
A platform, fund or trading bot promises steady returns from arbitrage, lending, mining or an algorithm. Deposits arrive in BTC, ETH or stablecoins. The dashboard shows a growing balance, some early withdrawals are honoured to build trust, and referral bonuses recruit more depositors. The reported returns were never earned. Withdrawals are funded from new deposits until they cannot be, and the platform freezes, blames a hack, or disappears.
Two features distinguish it from an honest failure. The reported income was fictitious, and the operator appropriated investor funds. A platform that lost customer assets through genuine bad trading or a real exploit is not a Ponzi scheme, even if the outcome for depositors looks the same.
Cloud mining contracts that paid daily returns from new subscriptions rather than from mining. Lending platforms whose published yields were unsupported by any lending. Trading bots and managed accounts with fabricated performance. Referral schemes built around a token whose only demand came from the scheme itself. In each, investors who withdrew early received other investors' money, and those who stayed lost their principal plus the returns they had been told they earned.
As a theft loss, not a capital loss. Revenue Ruling 2009-9 holds that a loss from a Ponzi scheme is a theft loss under IRC Section 165, that it arises in a transaction entered into for profit under Section 165(c)(2), and that it is therefore not subject to the Section 165(h) limitations on personal casualty and theft losses. The distinction from a capital loss matters: a capital loss offsets capital gains plus $3,000 of ordinary income a year, while a Section 165(c)(2) theft loss is an itemized deduction that can offset ordinary income in full and, under Section 172, can produce a net operating loss.
The ruling also settles what the loss includes. It covers the unrecovered principal plus any fictitious income that the investor reported on earlier returns and left in the scheme. Those phantom returns were taxed when reported, so they form part of the investor's basis in the arrangement and part of the loss. Prior returns are not amended to remove the phantom income; the correction comes through the loss deduction.
Timing follows the general theft rules. The loss is sustained in the discovery year under Section 165(e), and any part covered by a claim with a reasonable prospect of recovery, such as a receivership or bankruptcy claim, is deferred until that claim is resolved. Because receiverships run for years, the IRS issued Revenue Procedure 2009-20, the Ponzi scheme safe harbor, which lets a qualified investor deduct a fixed percentage of the investment in the discovery year without litigating the recovery prospects. The safe harbor is optional; the general rules remain available.
None of this applies unless the arrangement was in fact a Ponzi scheme. A platform that failed through mismanagement or insolvency leaves depositors with a creditor claim, and the eventual shortfall is analysed under different rules, not as theft.
Phantom income is the figure most often left out. An investor who reported $40,000 of platform earnings across three years and reinvested all of it has a loss that includes that $40,000, but a loss schedule built from bank and wallet transfers alone shows only the cash deposited. The earlier returns, the platform statements and the reinvestment history have to be reconciled to arrive at the right figure, and the reconciliation has to survive an examination.
Read our 2026 Guide to Claiming Crypto Losses from Fraud, Scams, Theft
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