U.S. crypto taxpayers who received an automatic six-month filing extension have entered the final stretch before the Oct. 15 deadline for most 2025 federal income tax returns.
Summary
- October 15 is the filing deadline for most taxpayers who requested six-month extensions this year.
- 2025 digital asset sales reported on Form 1099-DA often lack cost basis, requiring calculations themselves.
- Unpaid taxes were still due April 15, so interest and late-payment penalties may already apply.
- Late filing penalties generally start at 5% monthly and can reach 25% of unpaid tax.
- Certain disaster-affected taxpayers have later IRS deadlines, including some extending into February 2027 for filing.
The Internal Revenue Service said taxpayers who requested an extension by April 15 generally have until Oct. 15, 2026, to file their return, while making clear that the extension did not provide extra time to pay outstanding taxes.
For crypto users, the deadline arrives during the first filing season in which many investors have received Form 1099-DA covering digital asset transactions. The new broker reporting system provides another set of records for taxpayers to compare with exchange and wallet histories, but most 2025 forms do not contain cost-basis information.
Crypto tax filers may need to calculate their own cost basis
Form 1099-DA became the federal reporting form for certain broker-facilitated digital asset sales beginning with transactions on Jan. 1, 2025.
The IRS states that custodial trading platforms, certain hosted wallet providers, digital asset kiosks and specified payment processors are among the brokers covered by the reporting regulations. Brokers must report gross proceeds from qualifying 2025 sales.
For the first year, cost basis remains a major gap. The IRS warned that most Form 1099-DA statements covering 2025 transactions would not include basis, leaving taxpayers responsible for determining what they originally paid for the assets they sold.
Basis reporting becomes mandatory for brokers on certain covered digital asset transactions beginning in 2026. For 2025 activity, investors may need to reconstruct purchase dates, acquisition costs, transaction fees and quantities from their own records.
The first year of Form 1099-DA crypto reporting has already created a new reconciliation task for traders because broker proceeds may be available even when the information needed to calculate gains and losses is incomplete.
Crypto activity still must be reported even when no Form 1099-DA was issued. The IRS says taxpayers must report income, gains or losses from all taxable digital asset transactions regardless of whether they received an information return.
Sales and exchanges of crypto held as capital assets generally flow through Form 8949 and Schedule D. Mining, staking and similar ordinary income may instead be reported through Form 1040 or Schedule 1, depending on the taxpayer’s circumstances.
Every taxpayer filing a federal return must answer the digital asset question with “Yes” or “No.” Simply buying crypto with dollars and holding it, or transferring assets between wallets owned by the same taxpayer without another taxable event, generally does not require a “Yes” answer by itself.
The extension did not move the April tax payment deadline
Taxpayers who filed Form 4868 received more time to submit paperwork, not more time to pay their 2025 tax liability.
The IRS confirmed that taxes owed for most calendar-year individuals remained due on April 15, 2026. Taxpayers who could not determine their final return by then were expected to estimate what they owed and make a payment.
Interest can therefore already be accumulating for extension filers who still have an unpaid balance. Late-payment penalties may apply as well, even when the return itself remains timely through Oct. 15.
Filing the return remains important even when a taxpayer cannot pay the full amount. The IRS advises people in that position to file and pay as much as possible, then consider available payment-plan options.
Missing the extended filing deadline can create another penalty. The IRS states that the failure-to-file penalty is normally 5% of unpaid tax for each month or part of a month a return is late, subject to a 25% maximum.
When both failure-to-file and failure-to-pay penalties apply during the same month, the filing portion is generally reduced so the combined rate is 5% for that month. For returns required to be filed in 2026 that are more than 60 days late, the minimum failure-to-file penalty is the smaller of $525 or 100% of the unpaid tax.
Oct. 15 does not apply to every extension filer
Oct. 15 is the standard extended deadline for most individual filers, but some taxpayers have more time.
IRS disaster relief can postpone filing dates automatically for taxpayers whose homes or businesses are located in qualifying federally declared disaster areas. Current relief includes deadlines extending to Nov. 2, 2026, or Feb. 1, 2027, for taxpayers affected by certain disasters in several states and tribal areas.
People serving in combat zones can receive separate extensions. IRS guidance generally provides at least 180 days after qualifying service ends to file and pay.
The agency has granted even longer relief in some international cases. An IRS notice published in early October gives qualifying taxpayers affected by events in Israel, the West Bank and Gaza until Sept. 30, 2027, for certain tax actions falling within the covered period.
Taxpayers therefore need to determine whether a specific relief notice applies before treating Oct. 15 as their final date.
For most ordinary Form 4868 filers, the IRS electronic filing calendar lists Oct. 15 as the final date for timely returns on extension. Returns rejected around the deadline may qualify for a short retransmission period through Oct. 20 under the agency’s e-file schedule.
U.S. crypto rules continue without the CLARITY Act
The tax deadline remains separate from Congress’s stalled effort to pass a federal crypto market-structure law.
On Sept. 15, the Senate rejected cloture on the motion to proceed with H.R. 3633, the Digital Asset Market Clarity Act, by 49 votes to 50. Sixty votes were needed to advance the procedural motion.
The failed vote did not suspend existing federal tax requirements. The Internal Revenue Code, IRS digital asset guidance and Form 1099-DA reporting rules remain in force independently of the market-structure bill.
As previously reported, the CLARITY Act failed its September Senate test after lawmakers fell short of the 60 votes required to open formal debate.
For taxpayers completing 2025 returns, the more immediate change is broker reporting. Form 1099-DA now gives the IRS gross-proceeds information on many custodial crypto sales, while individuals remain responsible for reconciling transactions that occurred across multiple exchanges, wallets and services.
IRS guidance tells tax professionals to review transactions across accounts, reconcile missing records and apply the correct cost-basis method before filing. Decentralized finance platforms and some foreign brokers may not issue Form 1099-DA, meaning a taxpayer’s own records can still contain taxable activity absent from broker statements.
For most taxpayers who secured the normal six-month extension, the IRS e-file calendar lists Oct. 15, 2026, as the deadline for submitting the 2025 federal return.
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