U.S. taxpayers who obtained an automatic extension for their 2025 federal income tax returns must file by October 15, 2026. The date applies to individuals reporting digital-asset activity and is not a separate crypto-only deadline. An extension grants extra time to file but does not delay payment of any tax owed, which was generally due by April 15.

Filing Extension Covers Returns, Not Payments

Taxpayers who submitted Form 4868 by the April deadline received six additional months to complete their returns. The IRS treats October 15 as the final date for most calendar-year individuals covered by a valid extension. Disaster relief or rules for certain citizens living abroad can create different deadlines in specific cases.

Any tax liability for 2025 was still required to be estimated and paid by the original April date. Interest has been accruing on unpaid balances since then, and late-payment penalties may also apply. Filing on the extended date does not eliminate those charges.

Form 1099-DA Brings New Reporting Data

The 2025 tax year marks the first filing season in which many custodial brokers must report digital-asset sales and exchanges on Form 1099-DA. Brokers provide customers with statements containing the same gross-proceeds information sent to the IRS. Gross proceeds represent the total amount received from a sale, not the taxable gain or loss.

For most 2025 transactions, cost basis is not required on the form. Investors remain responsible for determining what they originally paid for the assets and calculating gains or losses accordingly. The IRS has stated that taxpayers must report taxable events even if they never receive a Form 1099 or similar information return.

An August survey of 1,000 U.S. crypto investors found that 21 percent of those who filed or planned to file an extension were still waiting for information from an exchange or platform as the deadline approached.

What Counts as a Reportable Crypto Transaction

Form 1040 requires every filer to answer a digital-asset question with either “Yes” or “No.” A “Yes” answer is generally required after receiving digital assets as mining or staking rewards, compensation, or other payments, or after selling, exchanging, or otherwise disposing of a digital asset. Crypto-to-crypto swaps and using digital assets to pay for goods, services, or transaction fees can trigger reporting obligations.

Gains and losses on capital assets are typically calculated on Form 8949 and summarized on Schedule D. Staking, mining, and certain other rewards are treated as ordinary income. Simply buying digital assets with U.S. dollars and holding them, or transferring assets between wallets under the same taxpayer’s control, generally does not create a taxable event, though paying a transfer fee in crypto can.

Penalties for Missing the Deadline

Once the extension expires, a failure-to-file penalty applies to any unpaid tax. The standard rate is 5 percent of the unpaid amount for each month or part of a month the return is late, capped at 25 percent. For returns due in 2026 that are more than 60 days late, a minimum penalty equal to the smaller of $525 or 100 percent of the unpaid tax may apply.

A separate failure-to-pay penalty runs at 0.5 percent of unpaid tax per month, also capped at 25 percent. When both penalties apply in the same month, the IRS typically adjusts the combined monthly rate to 5 percent. Interest continues to compound daily on any unpaid balance.

Taxpayers who cannot pay the full amount owed are still able to file on time. The IRS offers payment-plan options, and timely filing can prevent the failure-to-file penalty from being added to an existing unpaid balance.

Basis Reporting Expands in Future Years

Mandatory cost-basis reporting by brokers begins for certain covered digital-asset transactions occurring on or after January 1, 2026. Assets purchased before 2026 or transferred into a broker account from another location may remain noncovered, leaving investors responsible for their own records. Form 1099-DA statements for 2026 activity will begin appearing during the 2027 filing season.

Separate legislative efforts, including a House proposal that would address small network fees and other digital-asset tax treatment, have not altered the rules governing 2025 returns. The CLARITY Act, which focuses on digital-asset market structure rather than income-tax deadlines, failed to advance in the Senate on a 49-50 vote in mid-September and does not change the October 15 filing obligation.

Investors preparing returns are advised to reconcile broker statements with their own exchange records, wallet histories, and purchase data. Self-custody activity and older lots often require manual reconstruction of cost basis. Filing with the most complete records available remains preferable to missing the deadline entirely.