Tax Extension vs. Tax Payment

You have probably heard this before:

“If you aren't ready to file, just get an extension.”

Then you hear something else:

“But an extension doesn't give you more time to pay.”

And naturally, the next question is:

Then what is the point of getting an extension?

That's a good question. If the tax is still due around the original filing deadline, and unpaid tax can still accumulate interest and potentially penalties, why bother extending the return?

Because there are actually two different responsibilities involved: filing the return and paying the tax. An extension addresses one of them.

AN EXTENSION DOESN'T MOVE THE TAX. IT MOVES THE FILING DEADLINE.

01One Tax Deadline Can Involve Two Different Responsibilities

For most calendar-year individual taxpayers, the federal income tax return and any tax owed are generally due around April 15. But those are still two separate obligations.

Responsibility #1: File the return on time.

Responsibility #2: Pay the tax on time.

If you need additional time to prepare the return, a properly requested federal extension generally gives an individual taxpayer up to six additional months to file. For most calendar-year taxpayers, that generally moves the filing deadline to October 15.

But the extension does not normally move the original deadline for paying the tax.

MORE TIME TO FILE DOES NOT MEAN MORE TIME TO PAY.

A federal extension solves a filing deadline problem. It does not automatically solve a payment problem.

02Then Why Does an Extension Matter?

Because ignoring the filing deadline can create an additional problem on top of the unpaid tax.

Imagine that you know you will owe money, but your return is not ready. Maybe you're missing documents. Maybe some information needs to be corrected. Maybe your business records are not completely organized. Maybe you need additional time to verify information before putting your name on the return.

You now have two issues:

• The return isn't ready.
• The tax may still be due.

The extension can help with the first problem. If you properly request the extension by the original filing deadline and then file within the extended period, you generally avoid being considered late simply because the return was filed after the original deadline.

The unpaid tax is a separate issue.

THE EXTENSION DOESN'T MAKE THE BALANCE DISAPPEAR. IT CAN KEEP THE BALANCE FROM BECOMING A LATE-FILING PROBLEM TOO.

03Filing Late and Paying Late Are Not the Same Penalty

The federal failure-to-file penalty is generally 5% of the unpaid tax for each month or part of a month the return is late, up to a 25% maximum.

The federal failure-to-pay penalty is generally 0.5% of the unpaid tax for each month or part of a month the tax remains unpaid, also generally subject to a 25% maximum.

If both penalties apply during the same month, they interact. The failure-to-file portion is generally reduced so the combined rate for that month is generally 5%, rather than simply adding 5% and 0.5% together. The exact calculation can depend on the circumstances.

That is why simply thinking “I'm going to owe anyway, so an extension doesn't matter” can be an expensive misunderstanding.

DON'T TURN ONE TAX PROBLEM INTO TWO.

04Interest Is Different From a Penalty

There is another piece people often combine with penalties: interest. They are not the same thing.

Interest generally begins accruing on unpaid federal tax from the original payment due date until the tax is paid. A filing extension generally does not stop that interest.

Federal tax underpayment interest rates are determined quarterly, and interest compounds daily. Because the rate changes, it is better to check the current IRS rate than memorize one percentage as if it applies forever.

Think about the three concepts separately:

• Filing deadline
• Payment deadline
• Interest on unpaid tax

The extension moves the first. It normally does not move the second, and it normally does not stop the third.

05You Do Not Have to Pay the Entire Balance Just to Get the Filing Extension

A taxpayer generally is not required to pay the full estimated balance due in order to obtain the automatic filing extension.

Current Form 4868 instructions state that a taxpayer can still receive the extension even if the full estimated amount cannot be paid. But the taxpayer should properly estimate the tax liability using the information available and understand that unpaid tax may still generate interest and potentially a late-payment penalty.

So these are two different statements:

“I can't pay the whole tax bill.”

and

“I shouldn't request an extension.”

The first statement does not automatically make the second one true.

CAN'T PAY IN FULL? THAT DOESN'T MEAN YOU SHOULD IGNORE THE FILING DEADLINE.

06The Extension Still Requires an Estimate

An extension is not supposed to mean “I have no idea what I owe, so I'll deal with everything in October.”

Form 4868 requires taxpayers requesting an extension to make a proper estimate of their tax liability using the information available.

The basic idea is to estimate:

Expected total tax
minus
Tax already paid through withholding, estimated payments, and other applicable payments
equals
Estimated balance remaining

That estimate can help determine what should be paid by the original deadline. The return itself can be completed later.

EXTENDING THE RETURN DOESN'T MEAN POSTPONING THE ENTIRE TAX CONVERSATION.

07What If You Can Pay Some of It, but Not All of It?

Pay what you reasonably can by the original payment deadline.

Interest and applicable late-payment penalties generally apply to the unpaid amount. Reducing the unpaid balance can reduce the amount on which those additional charges continue to accumulate.

Suppose you estimate that you will owe $4,000.

You can pay only $2,500 by the original deadline.

Paying the $2,500 does not eliminate the remaining issue. But now the remaining unpaid tax is approximately $1,500 rather than $4,000.

YOU DON'T HAVE TO SOLVE THE ENTIRE BALANCE TO START REDUCING THE PROBLEM.

08There Is an Important 90% Rule During the Automatic Extension Period

This is more technical, but it is important enough to understand.

Under the current Form 4868 instructions, a taxpayer is considered to have reasonable cause for the automatic extension period for purposes of the late-payment penalty if both of these conditions are met:

• At least 90% of the total tax shown on the return was paid by the original due date through withholding, estimated tax payments, or payments made with the extension.
• The remaining balance is paid with the return.

Interest can still apply to the unpaid balance from the original due date.

Simplified example:

That is 90% of the total tax.

The taxpayer properly requests an extension, later files during the extension period, and pays the remaining $1,000 with the return.

Under the current Form 4868 rule described above, the taxpayer may avoid the late-payment penalty for the automatic extension period because the 90% condition was met and the remaining balance was paid with the return.

INTEREST CAN STILL APPLY TO THAT UNPAID $1,000.

Do not confuse this extension-related 90% rule with other tax rules involving estimated-tax safe harbors. They address different issues.

09When Does Asking for an Extension Make Sense?

An extension can be appropriate when you legitimately need more time to complete an accurate return.

• You are still waiting for a tax document or corrected document.
• Your records need additional organization.
• A business owner needs more time to accurately complete income and expense records.
• Information affecting filing status, dependents, income, deductions, or credits still needs to be confirmed.
• You need more time to prepare a complete return rather than rushing to submit something you do not fully understand.

THE GOAL OF AN EXTENSION IS MORE TIME TO FILE CORRECTLY, NOT MORE TIME TO AVOID THE RETURN.

If your return becomes ready before the extended deadline, you do not have to wait until October to file it. You can file as soon as it is ready.

10How Do You Request a Federal Filing Extension?

For an individual federal income tax return, the extension generally must be requested by the original filing due date.

Current federal options include making an electronic payment and indicating that it is for an extension, requesting the extension electronically, or submitting Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return.

A reason generally does not have to be provided just because you are requesting the normal automatic extension.

Official federal extension information: Get an Extension to File Your Tax Return - IRS

Keep the confirmation showing that the extension was successfully submitted or accepted.

11What If You Can't Pay Even After You File?

Filing the return and dealing with the balance are still separate actions.

If the return is ready, filing it does not require you to pretend you can immediately pay an amount that you cannot afford.

Current federal payment options can include short-term arrangements and longer-term installment agreements for taxpayers who qualify.

Interest and applicable penalties generally continue while tax remains unpaid, so a payment plan does not turn the balance into an interest-free loan. For an individual who filed the return on time, the usual failure-to-pay penalty rate can be reduced while an approved installment agreement is in effect.

Official federal payment-plan information: IRS Payment Plans and Installment Agreements

FILE THE RETURN. IDENTIFY THE BALANCE. THEN DEAL WITH THE PAYMENT PROBLEM DIRECTLY.

12What If You Already Missed the Deadline?

An extension generally needs to be requested by the original filing deadline. If that deadline has already passed and no valid extension applies, simply submitting Form 4868 afterward generally does not rewind the clock and make the original filing timely.

The better move is usually to stop delaying. If the return is already past due, federal guidance advises taxpayers to file past-due returns even when they cannot pay the full amount immediately. Filing can limit additional late-filing exposure, and paying what is possible can reduce the unpaid balance on which additional charges may continue.

There may also be situations where a taxpayer qualifies for penalty relief, but qualification depends on the specific facts and applicable rules.

THE DEADLINE ALREADY PASSED IS NOT A REASON TO LET ANOTHER MONTH PASS.

Article #12 will go deeper into what to know when you're already behind on filing taxes.

13What If You Think You're Getting a Refund?

If you reasonably expect a refund rather than a balance due, there may be no tax balance on which the normal failure-to-file or failure-to-pay penalties are calculated.

But that does not make filing unimportant. You have to file a return to claim a refund, and federal law places time limits on refund claims. The rules can vary depending on when the return was filed and when the tax was paid.

So:

“I think I'm getting a refund”

should not become

“I never need to file.”

Those are very different statements.

The TaxFunders Extension Check

Before treating an extension as the solution, use these questions to check your own situation. You should be able to answer them for yourself after understanding the concepts in this guide. If you cannot answer one yet, that may be a sign that you need more information before deciding what to do next.

• Is my problem that the return is not ready, that I cannot pay, or both?
• Have I estimated my total federal tax as accurately as I reasonably can with the information available?
• How much has already been paid through withholding or estimated payments?
• Do I expect to have a remaining balance?
• How much of that balance can I pay by the original due date?
• Has the extension actually been requested and confirmed?
• Do I understand my extended filing deadline?
• Do I understand that interest may continue on unpaid tax?
• If I cannot pay in full, have I looked at the available payment options instead of ignoring the balance?
• Do I know what information is still preventing the return from being completed?
• Am I planning to file as soon as the return is ready rather than automatically waiting until the last day of the extension?

That is the difference between using an extension intentionally and simply postponing the problem.

The TaxFunders Bottom Line

An extension can sound strange at first. Why extend if you still have to pay?

Because the return and the payment are not the same responsibility.

If the tax is unpaid, an extension generally will not stop interest from running. It may not eliminate a late-payment penalty. It does not erase the balance.

But a properly requested extension can protect additional time to prepare and file the return and help prevent a payment problem from becoming a late-filing problem too.

That is valuable.

MORE TIME TO FILE DOESN'T ERASE WHAT YOU OWE. BUT IT CAN KEEP A PAYMENT PROBLEM FROM BECOMING A FILING PROBLEM TOO.

And if the reason you need an extension is that the return genuinely isn't ready, use the extra time for what it was intended to do:

• Get the information together.
• Understand the numbers.
• Complete the return.
• File it before the extended deadline.
• Address any balance instead of letting it sit unanswered.

DON'T CONFUSE MORE TIME WITH NO RESPONSIBILITY.

TAXES, EXPLAINED.

Education First. Always.