December 2025 IRS payment important date and what triggers them
The IRS has several payment important date in December 2025, and which ones affect you depends on your filing status and business structure. The most common important date is December 15, 2025, which applies to estimated tax payments for the fourth quarter of 2025. If you're self-employed, own a business, or have income that doesn't have taxes withheld, you owe estimated payments four times a year — and the final one lands in mid-December.
A second important date is December 31, 2025, which is the last day to make certain moves that reduce your 2025 tax bill — like contributing to a traditional IRA or making charitable donations. Payments made after December 31 count toward 2026 taxes instead.
If you're a business owner with employees, you also have December 31, 2025 to deposit payroll taxes for the final pay period of the year, depending on your deposit schedule. The exact date depends on whether you deposit weekly, biweekly, or monthly.
Key Takeaways
- Estimated tax payments for the fourth quarter of 2025 are due December 15, 2025, and explore to self-employed people and those with income that isn't automatically taxed.
- You can pay the IRS online through IRS Direct Pay, by phone, by mail, or through an approved payment processor — each method has different processing times.
- Missing the December 15 important date triggers a failure-to-pay penalty of 0.5% per month, even if you eventually pay what you owe.
- December 31, 2025 is the final day to make tax-reducing moves like IRA contributions or charitable donations that count toward 2025 taxes.
- If you can't pay by the important date, you can request a short-term extension or set up a payment plan with the IRS to avoid additional penalties.
Who owes estimated tax payments in December 2025
You owe estimated taxes if you expect to owe $1,000 or more in federal income tax for 2025 and you don't have enough tax withheld from paychecks or other income sources. This includes self-employed people, freelancers, gig workers, business owners, investors with significant capital gains, and retirees withdrawing from IRAs or other retirement accounts.
If you're an employee with a W-2 job and your employer withholds taxes from your paycheck, you typically don't owe estimated payments — your employer handles that throughout the year. However, if you have a side business or freelance income in addition to your job, you may owe estimated taxes on that extra income.
The IRS expects you to pay estimated taxes in four installments spread across the year. The fourth-quarter payment covers income earned from October 1 through December 31, 2025, and is due December 15, 2025.
How to calculate your fourth-quarter estimated payment
The simplest approach is to divide your expected 2025 income by four and pay that amount each quarter. If your income is steady, this works well. If your income varies month to month, you can calculate each quarter separately based on what you actually earned that quarter.
Use Form 1040-ES (Estimated Tax for Individuals), which includes a worksheet to help you estimate your income, deductions, and tax liability. The form walks you through calculating federal income tax, self-employment tax (if you're self-employed), and any other taxes you expect to owe. You don't file this form with the IRS — it's a worksheet you keep for your records.
If you underpaid in earlier quarters, you can make up the difference in the December payment. If you overpaid, you can reduce your December payment or claim the overpayment as a credit on your 2025 tax return when you file in 2026.
Payment methods and processing times for December 2025
The IRS offers several ways to pay, and the method you choose affects how quickly the payment is processed and whether you incur fees.
| Payment Method | Processing Time | Fees |
|---|---|---|
| IRS Direct Pay (online) | Same day or next business day | None |
| Electronic Federal Tax Payment System (EFTPS) | Same day or next business day | None |
| Credit or debit card (through approved processor) | Same day or next business day | 2% to 3.7% convenience fee |
| Phone payment | Same day or next business day | None |
| Mail (check or money order) | 5 to 7 business days | None |
IRS Direct Pay is the fastest and cheapest option if you have a bank account. You go to irs.gov, enter your Social Security number or EIN, bank account details, and payment amount, and the payment posts within one business day. There's no fee.
EFTPS (Electronic Federal Tax Payment System) is another free option that requires you to enroll in advance — you can't use it for the first time on December 15. If you're already enrolled, you can schedule a payment up to 120 days in advance.
If you pay by credit or debit card, the IRS doesn't charge a fee, but the payment processor does — typically 2% to 3.7% of the amount. For a $5,000 payment, that's $100 to $185 in fees. This method makes sense only if you're earning rewards points that exceed the fee cost.
If you mail a check or money order, allow 5 to 7 business days for processing. Write your Social Security number, the tax year (2025), and "Form 1040-ES" on the check. Mail it to the IRS address for your state, which is listed in the Form 1040-ES instructions.
Penalties and interest if you miss the December 15 important date
If you don't pay by December 15, 2025, the IRS charges a failure-to-pay penalty of 0.5% of the unpaid amount for each month or part of a month the payment is late. This penalty applies even if you eventually pay what you owe and even if you don't owe additional income tax.
The IRS also charges interest on unpaid taxes. The interest rate is set quarterly and changes based on the federal funds rate. For the fourth quarter of 2025, the rate is 8% per year, compounded daily. Interest accrues from the due date (December 15) until you pay.
If you pay a few days late, the penalty is small — 0.5% for the partial month. But if you don't pay for several months, the penalty adds up. A $5,000 payment that's 90 days late incurs roughly $62.50 in penalties plus interest.
What to do if you can't pay by December 15
If you don't have the full amount by December 15, you have options that reduce penalties. The best choice depends on when you can pay and how much you can pay now.
Pay what you can now and request a short-term extension. If you pay at least a portion of what you owe by December 15, you can request a short-term extension of up to 120 days to pay the rest. You don't need IRS approval — you can request this online through IRS Direct Pay or by calling 1-800-829-1040. The failure-to-pay penalty still applies to the unpaid balance, but it's smaller if you pay part of it on time.
Set up a payment plan. If you can't pay the full amount within 120 days, you can set up an installment agreement with the IRS. Short-term plans (under 120 days) have no setup fee. Long-term plans (over 120 days) have a setup fee of $31 to $225 depending on how you explore. You can set up a plan online at irs.gov or by calling 1-800-829-1040. The failure-to-pay penalty still applies, but you avoid additional penalties for non-payment as long as you stick to the plan.
Request a hardship delay. If you're experiencing a genuine financial hardship, you can request a delay in payment. This is rare and requires documentation, but it can temporarily pause penalties while you work out a payment plan.
December 31 important date for tax-reducing moves
Beyond the December 15 estimated tax payment, December 31, 2025 is the final day to make moves that reduce your 2025 tax bill. Any contributions or payments made after December 31 count toward 2026 taxes instead.
Traditional IRA contributions. You can contribute up to $7,000 to a traditional IRA for 2025 (or $8,000 if you're age 50 or older) and deduct the full amount from your 2025 income — but only if you make the contribution by December 31, 2025. Contributions made in January 2026 count toward your 2026 limit.
Charitable donations. Cash donations to may have access to charities are deductible for 2025 if you make them by December 31, 2025. Donations made in January 2026 are deductible in 2026. If you donate by check, the check must be postmarked by December 31, even if it clears your bank in January.
Business expenses. If you're self-employed, you can deduct business expenses paid in 2025 even if you pay them in late December. This includes supplies, equipment, professional services, and other costs directly tied to your business.
Frequently Asked Questions
What if I didn't pay estimated taxes all year and December 15 is my first payment?
You can still make a December payment, but you'll owe penalties for the three earlier quarters you missed. The IRS calculates penalties based on how much you should have paid each quarter and how late each payment is. When you file your 2025 tax return in 2026, the IRS will calculate the exact penalty owed. You can reduce the penalty by paying as much as possible in December.
Do I need to make an estimated tax payment if I'm retired and only have Social Security?
No. Social Security income is not subject to estimated tax payments. However, if you have other income — such as withdrawals from a traditional IRA, rental income, or investment gains — you may owe estimated taxes on that income.
Can I pay my estimated tax payment early, before December 15?
Yes. You can pay any time before the important date. If you pay early, the payment is applied to your fourth-quarter estimated tax liability. Paying early doesn't reduce your tax bill, but it ensures you don't miss the important date and incur penalties.
What happens if I overpay my estimated taxes in 2025?
When you file your 2025 tax return in 2026, the IRS will compare your total estimated payments to your actual tax liability. If you overpaid, you can request a refund or have the overpayment applied to your 2026 estimated taxes. You'll receive the refund within a few weeks if you file electronically.
Is there a penalty if I underpay my estimated taxes slightly?
The IRS charges an underpayment penalty only if you underpay by more than a small amount. The exact threshold depends on your income and tax situation. If your underpayment is less than $1,000, you typically won't owe a penalty. The IRS calculates this when you file your return, so you don't need to worry about it in December.