You can pay an IRS Form 4549 balance online through IRS Direct Pay, the Electronic Federal Tax Payment System (EFTPS), or an IRS-authorized debit or credit card processor. The choice depends on whether you’re an individual or a business, how quickly the payment needs to post, and whether you’re willing to pay a processing fee. The part most people get wrong isn’t the portal, it’s the setup: selecting the right payment reason, matching the exact tax year on the form, and adding enough to cover interest that has accrued since the examiner signed the report.
Pull These Numbers Off Form 4549 First
Before opening any payment site, get three items off the form. The tax period is the year-end date of the return that was audited, such as December 31, 2023. The tax form type is usually Form 1040 for individuals or Form 1120 for corporations. The deficiency amount is the increase in tax shown on the form, which already includes any penalties the examiner assessed.
Those penalties often include a 20 percent accuracy-related penalty for negligence, disregard of tax rules, or a substantial understatement of income. For individuals, an understatement counts as substantial when it exceeds the greater of $5,000 or 10 percent of the tax that should have been shown on the return.1Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments You can challenge that penalty later through abatement; the online payment process is the same either way.
Add Extra for Post-Report Interest
The interest figure printed on Form 4549 runs only through the date the examiner prepared the report. Interest keeps accruing daily between that date and the day your payment posts, at the federal short-term rate plus three percentage points, compounded daily.2Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges For the second quarter of 2026, the individual underpayment rate is 6 percent annually.3Internal Revenue Service. Internal Revenue Bulletin 2026-8
Estimate the extra roughly and add it to your payment. Overpay a little and the IRS refunds the difference. Underpay a little and you’ll get a small follow-up notice. Pay only the printed number and you’re almost guaranteed a balance-due notice a few weeks later.
Paying Through IRS Direct Pay
For individuals, IRS Direct Pay is the simplest route. It pulls funds from a checking or savings account with no fee and posts within one to two business days.4Internal Revenue Service. Direct Pay with Bank Account The maximum single payment is $10 million. If you’ve never filed a federal return, you can’t use Direct Pay, since the system verifies your identity against a prior-year return.
The payment reason you choose determines where the money lands. Direct Pay has no generic “audit” button, so pick based on where you are in the process:5Internal Revenue Service. Types of Payments Available to Individuals Through Direct Pay
- Proposed tax assessment if you’re paying right after signing Form 4549 but before the IRS has sent a bill.
- Balance due if the assessment has already been processed and you’ve received a notice with a balance.
- The specific notice number (CP2000, CP2501, or CP3219A) if one of those arrived with or in place of Form 4549.
After choosing the reason, enter the tax form (usually Form 1040) and the tax period matching Form 4549. The system verifies your identity using data from a prior-year return going back five to six years, so enter your name and address exactly as they appeared on the return you select.6Internal Revenue Service. Direct Pay Help Save the confirmation number the moment the transaction clears; it’s your proof of the payment date.
Paying Through EFTPS
The Electronic Federal Tax Payment System is the standard channel for business audit balances, especially anything filed under Form 1120. It also works for individuals who prefer scheduling payments in advance. The catch is enrollment: you must be enrolled before your first payment, and enrollment takes five to seven business days because the IRS mails a PIN to your address of record.7Electronic Federal Tax Payment System. Welcome to EFTPS Online If you’re holding a Form 4549 and haven’t enrolled, start now and use Direct Pay or a card processor in the meantime.
Once you’re in, select the tax type (Form 1040, Form 1120, and so on), enter the tax period, and input the amount. Payments can be scheduled up to 365 days in advance. Same-day payments of $1 million or less must be submitted before 3:00 p.m. Eastern on a business day. Larger payments need to be scheduled at least one calendar day before the due date by 8:00 p.m. Eastern.8Electronic Federal Tax Payment System. EFTPS Financial Institution Handbook EFTPS generates a confirmation number as soon as you schedule. Keep it, especially for corporate assessments.
Paying by Credit or Debit Card
The IRS authorizes two third-party processors for standalone card payments, and both charge a percentage-based fee.9Internal Revenue Service. Pay Your Taxes by Debit or Credit Card or Digital Wallet
- Pay1040: 1.75% for personal credit cards, minimum $2.50.
- ACI Payments: 1.85% for personal credit cards, minimum $2.50.
Commercial and corporate card rates run roughly 2.89% to 2.95%. On a $10,000 audit balance, the personal rate adds about $175 in fees. What you’re buying for that fee is an immediate payment date on record, which stops additional daily interest. You still select the correct tax form and tax period during the payment flow, just as with Direct Pay.
If You Can’t Pay the Full Balance
Interest and the failure-to-pay penalty keep running on any unpaid balance even after a payment plan is approved, so pay as much as you can up front to shrink the base they’re calculated on. The failure-to-pay penalty runs at 0.5 percent per month, dropping to 0.25 percent per month while an installment agreement is active and your return was filed on time, up to a 25 percent cap.10Internal Revenue Service. Failure to Pay Penalty
Individuals
If your total balance is under $100,000 (tax, penalties, and interest combined), you can apply online for a short-term plan of up to 180 days with no setup fee. If the balance is under $50,000, you qualify online for a long-term installment agreement of up to 72 months.11Internal Revenue Service. IRS Payment Plan Options – Fast, Easy and Secure The online setup fee is $22 for direct debit or $69 for a standard long-term plan.12Internal Revenue Service. Payment Plans Installment Agreements Low-income taxpayers (adjusted gross income at or below 250 percent of the federal poverty level) pay no setup fee for direct debit agreements and may be reimbursed the fee for other plan types on completion.
Businesses
Businesses can apply online if the total combined balance from the current and preceding tax year is under $25,000. The maximum repayment term is 24 months, not the 72 months available to individuals. Businesses that don’t fit those criteria file Form 9465 (Installment Agreement Request) and may need to submit detailed financial statements.13Internal Revenue Service. What If I Have Requested an Installment Agreement
Confirming the Payment Landed on the Right Year
Paying an audit balance isn’t like paying a routine bill. The IRS can take weeks to process the signed Form 4549, and a payment that arrives before the assessment is recorded sometimes sits in limbo or lands on the wrong tax year. That’s how people end up getting collection notices for balances they’ve already paid.
The IRS Online Account portal at irs.gov shows balances owed by tax year, up to five years of payment history, and pending or scheduled payments.14Internal Revenue Service. Online Account for Individuals New users verify identity through ID.me with photo identification. Log in, check the balance for the tax year on your Form 4549, and if it shows zero, you’re done. If it doesn’t and you’ve paid, call the number on your most recent notice.
For a fuller paper trail, order a record of account transcript through the same portal. It combines return data with account data, so both the original return figures and the post-audit adjustments appear side by side.15Internal Revenue Service. Transcript Types for Individuals and Ways to Order Them That’s the cleanest document to have on hand if a later notice contradicts what you know you paid.
Know What Signing Form 4549 Costs You
Paying is a separate act from signing, but they’re usually done together, and the signature has consequences the payment doesn’t. The consent language on Form 4549 waives your right to contest the findings in U.S. Tax Court and agrees to immediate assessment and collection, which skips the Notice of Deficiency (the “90-day letter”) that would otherwise give you a window to petition Tax Court before the liability is formally recorded.16Legal Information Institute. 90-Day Letter
You’re not out of options after signing. If you later find the audit was wrong, you can pay the full amount and file Form 1040-X as a formal refund claim, generally by the later of three years from the original filing date or two years from the payment date.17Internal Revenue Service. File an Amended Return18Taxpayer Advocate Service. Audit Reconsiderations19Internal Revenue Service. Penalty Relief for Reasonable Cause20Internal Revenue Service. About Form 843, Claim for Refund and Request for Abatement Interest on the underlying tax is almost never abated.
Your State Return Probably Needs Amending Too
A federal audit adjustment almost always changes your state tax liability, because most state returns start from federal figures. Most states require an amended state return or a notification to the state tax agency after a federal audit change, typically within 60 to 180 days of the final federal determination. Miss that window and state-level penalties and interest run independently of anything you owe the IRS. Check your state tax agency’s website for the exact reporting window and form; the state won’t prompt you.