It’s already April, and you haven’t had time to prepare your tax return. Maybe you’re still waiting on important tax documents, or life simply got in the way.
If you’re wondering, “What happens if I don’t file by the deadline?“you’re not alone. This is a common situation that many people face. You might even be asking yourself, “Is the IRS going to come after me on April 16th?”
Probably not, but there can be financial consequences if you owe taxes and miss the filing deadline.
Will you owe taxes?
The first thing to determine is whether you’ll owe additional federal income tax or receive a refund. You may not be able to come up with an exact amount, especially if you’re still waiting for tax documents, but even a reasonable estimate can help you decide what to do next.
If you’re expecting a refund, there generally aren’t any penalties for filing late because no tax is owed.
If, however, you think you’ll owe tax, try to estimate the amount and submit a payment with an extension by the extension deadline —April 15th for most people.
Paying as much as you can before the deadline helps reduce penalties and interest. What penalties can the IRS charge?If you owe tax after the filing deadline, the IRS can charge both penalties and interest. Here are the two most common types.
Failure-to-File penalty
This is generally the larger penalty and is calculated as 5% of the amount due for each month, or part of a month, your return is late, up to a maximum penalty of 25%.
For example:
Tax owed at the beginning of the penalty period: $1,000
First month failure-to-file penalty:
$1,000 × 5% = $50
$1,000 + $50 = $1,050
For the following month, the amount due at the beginning of the penalty period includes the remaining tax due, previously accrued penalties, and any interest that has accrued.
For example, if the balance entering the second month is $1,060 after penalties and interest:
Second month failure-to-file penalty:
$1,060 × 5% = $53
New balance before additional interest:
$1,060 + $53 = $1,113
This process continues as penalties and interest accrue, although the failure-to-file penalty itself is limited to a maximum of 25%.
Note: If both the failure-to-file and failure-to-pay penalties apply during the same month, the IRS reduces the failure-to-file penalty for that month.
Also note: If your tax return is more than 60 days late, the IRS may charge a minimum failure-to-file penalty. The amount is adjusted periodically for inflation and may be larger than the standard monthly calculation for smaller tax balances.
Failure-to-Pay penalty
The failure-to-pay penalty is generally smaller, but it continues to add up until your balance is paid. It is calculated as 0.5% of the amount due each month, up to a maximum penalty of 25%.
Using the same example:
Amount owed at the beginning of the penalty period: $1,000
First month failure-to-pay penalty:
$1,000 × 0.5% = $5
If the balance entering the following month is higher because of accrued penalties and interest, the penalty for that month would be calculated using the updated amount due.
Even though the failure-to-pay penalty starts at a much lower rate, it can become significant when a balance remains unpaid for an extended period.
What about interest?
In addition to penalties, the IRS charges interest on unpaid tax and penalties. Interest compounds daily and continues to accrue until the balance is paid in full.
Because interest compounds, the balance used to calculate additional interest includes amounts that have already accrued. This causes the total amount owed to increase over time.
Unlike penalties, there is no maximum amount of interest that can accrue.
The IRS determines the interest rate each quarter, so the rate may changes over time.
As penalties and interest accumulate, the amount you owe continues to grow until your balance is paid in full.
What’s the best course of action?
If you can’t finish your tax return by the deadline, file an extension.
If possible:
- Estimate what you’ll owe.
- Pay that amount with your extension.
If you’re unsure, paying a little more than you think you’ll owe can help reduce penalties and interest. Any overpayment will generally be refunded after your return is processed.
If you can’t afford to pay, don’t let that stop you from filing. Filing your return on time or filing a valid extension and then submitting your completed return by the extension deadline (October 15th for most people) generally allows you to avoid the much larger failure-to-file penalty.
Remember, an extension gives you more time to file, not more time to pay. Any unpaid balance will continue to accrue interest and penalties until it’s paid.
If you can’t pay the full amount, you may be eligible to apply for an IRS installment agreement to pay your balance over time.
Frequently Asked Questions (FAQs)
No. If you are expecting a refund, there are generally no penalties for filing late. The IRS calculates penalties as a percentage of unpaid tax; because you owe zero taxes, no penalty is assessed. However, you still need to file your return to claim and receive your money.
No. An extension gives you extra time to file your return (typically moving the deadline to October 15th), but it does not extend your time to pay. Any unpaid tax balance remaining after the original April deadline will immediately start accruing penalties and interest until it is paid in full.
Failure-to-File Penalty: Charged when you do not file your tax return or extension on time. It is generally larger, calculated at 5% per month (or fraction of a month) on the unpaid tax balance, up to a maximum of 25%.
Failure-to-Pay Penalty: Charged when you do not pay your full balance by the deadline. It is much lower, calculated at 0.5% per month on the unpaid tax balance, also capping out at 25%.
You should still file your tax return or submit an extension request on time, paying as much as you reasonably can. Filing on time avoids the steep 5% Failure-to-File penalty. For the remaining balance, you can apply for an IRS Installment Agreement to pay the rest over time in manageable payments.
No. Unlike penalties, which are capped at 25% of your balance, there is no upper limit on interest. Interest compounds daily on both unpaid tax and accrued penalties, and the rate is set quarterly by the IRS. The total amount will continue to grow until your balance is paid completely.
Suresh holds a Master of Commerce (M.Com) degree and is a dedicated personal finance researcher and writer. Combining his advanced academic background in commerce with deep industry research, he covers complex topics like taxation, banking systems, credit analysis, and personal finance strategies. As the founder of Tax Assistant (taxassistant.org), Suresh is committed to translating complicated financial guidelines and economic data into simple, accurate, and actionable educational resources for everyday readers.
