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September 15 Is a Major Tax Deadline – Who Actually Needs to Pay the IRS?

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September 15 Is a Major Tax Deadline - Who Actually Needs to Pay the IRS?
September 15, 2026, marks the third estimated federal tax payment deadline for many individuals, including taxpayers with self-employment or other income without sufficient withholding – Shutterstock

September 15 can sneak up on taxpayers because it does not involve the giant annual tax-day frenzy that surrounds April 15. Yet for millions of Americans, September 15 marks the deadline for the third estimated federal tax payment of 2026, and ignoring it could create an unpleasant surprise later.

The deadline generally matters to people who earn income without enough tax coming out of each paycheck, including many self-employed workers, investors and business owners. The good news? Plenty of taxpayers can happily leave September 15 alone.

September 15 Is Really About Estimated Taxes

The IRS divides estimated tax payments into four periods during the year, and September 15 marks the payment deadline for income earned from June 1 through August 31. For 2026, individuals generally use Form 1040-ES to calculate and pay the third installment of their estimated federal income tax.

Think of estimated taxes as the pay-as-you-go version of income taxes, rather than one giant bill waiting at the end of the year. Instead of having an employer automatically withhold enough money from every paycheck, certain taxpayers send money to the IRS during the year as they earn income.

Who Actually Needs to Send Money?

The September deadline can matter if income arrives without enough withholding attached to it, which commonly happens with self-employment income, investment income, taxable retirement income and some other types of non-wage earnings. The IRS generally says individuals, including sole proprietors, partners and S corporation shareholders, should make estimated payments when they expect to owe at least $1,000 when they file their return.

A freelancer who has a great summer and watches several large client payments land in a bank account, for example, may need to account for taxes during the year rather than waiting until filing season. The same issue can pop up for someone with substantial investment gains or other income that does not come with traditional paycheck withholding.

A Regular Paycheck Can Change the Picture

People who receive wages often have an easier path because employers generally withhold federal income tax from their paychecks. A taxpayer who realizes the withholding falls short can potentially increase withholding by submitting a new Form W-4 to the employer, which can reduce the need for separate estimated payments.

That does not mean every employee can forget about September 15, though, especially if a side business, investment activity or other income sits outside the paycheck. The IRS looks at the taxpayer’s overall tax situation, so a regular paycheck does not automatically provide a force field against estimated-tax requirements.

Some Taxpayers May Not Need a September Payment

A taxpayer generally does not have to make estimated payments for the current year if all three IRS conditions apply: the person had no tax liability in the prior year, held U.S. citizenship or resident-alien status for the entire year, and had a prior tax year covering 12 months.

Taxpayers who receive enough withholding throughout the year may also avoid separate estimated payments because withholding counts toward the tax they owe. The important detail involves the amount and timing of tax payments, because paying too little during the year can trigger an underpayment penalty even when the taxpayer eventually pays the full balance at filing time.

Missing the Deadline Can Cost More Than a Calendar Reminder

The IRS treats estimated taxes as part of its pay-as-you-go system, so missing or underpaying an installment can lead to an underpayment penalty. The size of any penalty depends on the taxpayer’s circumstances and payment history, which means a missed deadline does not automatically translate into one universal fee.

Someone who realizes September 15 slipped away should not toss the paperwork into a drawer and hope January brings better news. Making the payment as soon as possible can limit the period of underpayment, while taxpayers with more complicated situations may want to review their calculations or seek qualified tax help rather than guessing at the amount.

September 15 Has Other Tax Jobs, Too

Estimated payments do not represent the only tax business landing on September 15, because the IRS calendar also lists several filing and payment obligations for businesses and certain organizations. Calendar-year S corporations and partnerships that requested timely extensions generally face September 15 filing deadlines, while corporations also make their third estimated tax installment around this date.

That distinction matters because someone might hear “September 15 tax deadline” and assume every taxpayer needs to write the IRS a check. For many people, September 15 passes like any other Tuesday, while for others it represents an important checkpoint for keeping their 2026 federal tax bill on track.

Make September 15 a Checkpoint, Not a Tax Surprise

The smartest move involves looking at the entire 2026 tax picture before deciding whether a September payment belongs on the calendar. Review year-to-date income, withholding and previous estimated payments, then compare those figures with the tax liability expected for the full year. Form 1040-ES provides worksheets that taxpayers can use to calculate estimated payments, and the IRS also offers online payment options.

One more wrinkle deserves attention: taxpayers with fiscal years can follow different estimated-tax schedules, so the standard September 15 date does not cover every situation. For calendar-year taxpayers, however, September 15, 2026, is the third estimated-tax payment deadline, making it a date worth circling before the calendar gets buried under football schedules, school events and pumpkin-spice everything.

Does the September 15 tax deadline catch you every year, or do you have a system for keeping estimated payments under control? Share your experience in the comments.

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You Can Pay the IRS Directly From Your Bank Account for Free—No Registration Required

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IRS Direct Pay
IRS Direct Pay allows taxpayers to send eligible federal tax payments directly from a checking or savings account without registering for an IRS Online Account or paying a Direct Pay fee. Users can make same-day payments or schedule them up to 365 days in advance and receive a confirmation number after submitting the request. BLACKDAY/Shutterstock

Paying a federal tax bill online doesn’t necessarily require creating another account—or paying a processing fee to use a credit or debit card.

The Internal Revenue Service issued a reminder September 10 that its Direct Pay service allows taxpayers to send federal tax payments directly from a checking or savings account for free. No registration or IRS Online Account is required.

The tool can be useful for taxpayers paying a balance due, making estimated tax payments, paying after filing an amended return, requesting certain filing extensions, or handling several other federal tax obligations.

Here’s what taxpayers should know before using it.

Direct Pay Doesn’t Require an IRS Account

IRS Direct Pay works differently from the agency’s Individual Online Account.

Taxpayers using Direct Pay make a one-time payment without signing in or registering for an account. Individual taxpayers instead answer identity-verification questions using information from a prior-year tax return they select.

For businesses, the system verifies the business name and employer identification number against IRS records.

Payments are made directly from a checking or savings account at a U.S. financial institution using the bank’s routing and account numbers.

The IRS describes Direct Pay as both free and secure.

You Can Use It for More Than a Tax Bill

Direct Pay isn’t limited to paying the balance shown on an annual income tax return.

Individual taxpayers can use it for numerous payment types, including balance-due payments, estimated taxes, amended returns, installment agreements and certain extension payments.

Business taxpayers can use Direct Pay for balance-due payments, federal tax deposits and other eligible federal tax payments.

There is an important rule for married couples filing jointly: taxpayers generally need to enter information for the spouse whose name appears first on the joint tax return when making the payment.

The IRS provides a list of eligible payment types through its Direct Pay Help resources.

Payments Can Be Scheduled Up to a Year Ahead

Direct Pay also offers some flexibility for people who don’t want the money withdrawn immediately.

The IRS says taxpayers can make a same-day payment or schedule one as far as 365 days in advance. That could be particularly useful for someone planning estimated tax payments or preparing ahead for a known tax deadline.

After submitting a payment request, taxpayers receive a confirmation number and can also choose to receive confirmation by email.

Keep that number.

It is needed if you later want to look up, change, or cancel the payment. The IRS generally allows a scheduled Direct Pay payment to be changed or canceled up to two business days before its scheduled date.

One limitation is that Direct Pay handles one payment at a time rather than establishing an automatic recurring-payment schedule.

There Are Several Important Limits

Direct Pay isn’t available for every taxpayer or every situation.

People who have never filed a federal tax return—or who haven’t filed one in more than six years—may need to choose another IRS payment method because Direct Pay relies on prior return information for individual identity verification.

The service also cannot be used to have a tax refund directly deposited into your bank account. Despite the similar terminology, Direct Pay is a payment service for sending money to the IRS, not receiving a refund from it.

The IRS also limits users to five Direct Pay payments within a 24-hour period.

Individual Direct Pay payments must be less than $10 million. Taxpayers needing to make a payment of $10 million or more can use a same-day wire transfer or the Electronic Federal Tax Payment System when eligible and enrolled.

Don’t Stop at the Confirmation Screen

Receiving a Direct Pay confirmation number means the IRS received the payment request, but taxpayers should still make sure the money was successfully withdrawn.

The IRS recommends checking your bank statement or IRS account at least 48 hours after the requested payment date to confirm the transaction was completed.

That’s particularly important because a payment request could fail if, for example, the account doesn’t contain enough money to cover the withdrawal.

Saving the confirmation number and checking the corresponding bank transaction gives taxpayers documentation if they later need to investigate a payment problem.

Start at IRS.gov Instead of a Search Ad or Unfamiliar Link

Taxpayers interested in Direct Pay should access it through IRS.gov rather than relying on an unsolicited email, text message, advertisement, or unfamiliar website claiming to collect federal tax payments.

The legitimate IRS tool does not charge taxpayers a fee to send an eligible payment directly from their checking or savings account.

That’s an important distinction from some other electronic payment options. The IRS notes that taxpayers who choose to pay federal taxes using a debit card, credit card, or digital wallet generally make the transaction through an approved payment processor that charges a processing fee.

For someone who simply wants to send money directly from a bank account without registering for another online service, Direct Pay provides a relatively straightforward alternative.

Just verify the payment type, bank information, tax year, and amount carefully before submitting—and save the confirmation number until you’re certain the payment has been processed.

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IRS Keeps Interest Rate at 7% for Taxpayers Who Owe Money in Late 2026

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IRS interest rates 2026
The IRS will keep its interest rate on individual tax underpayments and overpayments at 7% annually, compounded daily, for the fourth quarter beginning October 1, 2026. Pixel-Shot/Shutterstock

Taxpayers carrying an unpaid federal tax balance will continue facing a 7% annual interest rate through the end of 2026.

The Internal Revenue Service announced August 21 that interest rates will remain unchanged for the calendar quarter beginning October 1, 2026. For individuals, both tax underpayments and overpayments will carry a 7% annual rate, compounded daily.

That means taxpayers who owe the IRS should not expect interest costs to become cheaper during the final three months of the year. On the other hand, taxpayers entitled to interest on certain delayed refunds will continue receiving the same 7% rate.

What the 7% IRS Interest Rate Means for Taxpayers

Interest can become important when someone files a tax return but cannot immediately pay the entire balance due. The IRS generally charges interest on unpaid taxes, and because that interest compounds daily, delaying payment can steadily increase the amount owed.

The fourth-quarter rate applies from October 1 through December 31, 2026. The IRS calculates rates quarterly, so the percentage can rise or fall in subsequent quarters depending on changes in the federal short-term rate.

For taxpayers other than corporations, the underpayment and overpayment rates are calculated using the federal short-term rate plus three percentage points. The IRS said the fourth-quarter rates were based on the federal short-term rate determined during July 2026.

The Rate Isn’t Increasing From the Previous Quarter

The announcement does not represent a new increase for taxpayers. Individual overpayments and underpayments were already subject to a 7% rate during the third quarter of 2026, covering July through September.

That distinction may be useful for consumers who see headlines about a “7% IRS interest rate” and assume a new increase is taking effect in October. Instead, the agency is maintaining its existing rate.

IRS rates have moved during 2026. The individual rate was 7% during the first quarter, fell to 6% for the second quarter and returned to 7% for the third quarter before remaining there for the fourth.

Overpayments Can Earn Interest Too

Interest does not work exclusively against taxpayers. The IRS can also pay interest on qualifying overpayments when taxpayers have paid more than they owe and the government does not issue the refund within the applicable time period.

For individuals, the fourth-quarter overpayment rate will also remain 7% annually, compounded daily. However, taxpayers should not interpret that as meaning every tax refund automatically earns 7% interest. Whether interest is owed depends on the circumstances and timing surrounding the refund.

The IRS describes an overpayment as a payment made in excess of the amount owed.

Corporations Have Different Interest Rates

Businesses should pay attention to a separate set of numbers. For the fourth quarter, the corporate overpayment rate will be 6%, while the rate on the portion of a corporate overpayment exceeding $10,000 for a taxable period will be 4.5%.

The general underpayment rate remains 7%, while large corporate underpayments are subject to a substantially higher 9% rate.

These differences result from formulas established under the Internal Revenue Code. Generally, corporate overpayments use the federal short-term rate plus two percentage points, while large corporate underpayments use the federal short-term rate plus five percentage points.

Owing the IRS Can Become More Expensive the Longer You Wait

For households, the practical takeaway is straightforward: a tax balance that remains unpaid can continue accumulating interest even though the fourth-quarter rate isn’t increasing.

Taxpayers who discover they owe money after filing should therefore avoid assuming that waiting until the next quarter will automatically produce a lower interest rate. IRS rates are recalculated quarterly, and future rates can move in either direction.

The complete fourth-quarter calculations are contained in Revenue Ruling 2026-15, which the IRS says will appear in Internal Revenue Bulletin 2026-36 dated August 31, 2026. Taxpayers who need information about their own balances, payment options or interest charges can use IRS.gov or consult a qualified tax professional.

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