Filing for a federal tax extension isn't just a pause button on your tax obligations.
It's a bridge to your final return that needs to be crossed strategically.
And if you treat a tax extension as a way to simply push taxes out of your mind until October, you could end up facing some pretty heavy penalties.
So, to help you use this extra time to your advantage, I’ve outlined the six mistakes I most often see Staten Island taxpayers make, and steps you can take to stay compliant.
Yes, your return is on extension, but your unpaid tax balance is still due on April 15th. And your balance is exposed to penalties and interest if you miss that deadline.
If you file an extension but fail to pay the full balance due, you’ll be assessed a failure-to-pay penalty of 0.5% of the unpaid amount for each month (or partial month) that tax remains unpaid. Which can accrue up to a max of 25%.
On top of that, the IRS charges underpayment interest that compounds daily on the remaining balance. For 2026, the rate is 7% annually, compounded daily.
The extension does protect you from the much harsher 5% monthly failure-to-file penalty. But the combination of the 0.5% penalty and daily interest means your most effective strategy is to pay as much of your estimated balance as possible by the April deadline.
Even if you can’t pay your balance in full by April 15th, a partial payment can do three useful things:
1. Reduce the unpaid amount subject to ongoing penalties and interest
Every dollar you can pay by the April 15th deadline reduces the amount the IRS uses to calculate your penalties and interest. Since the failure-to-pay penalty and daily compounded interest are percentage-based, lowering the base balance directly shrinks the rate at which your debt grows.
2. Show that you made a good-faith effort to address the liability
Making a partial payment demonstrates good faith on your part. It shows your intent to comply, which can go a long way when requesting a payment plan or penalty abatement later.
Plus, if you file on time and set up an approved payment plan, the failure to pay rate is typically halved to 0.25% per month.
3. Make the eventual bill payment less painful
Think of it like stopping a leak. You might not be able to fix the pipe entirely right now, but reducing the flow prevents your tax bill from ballooning into a much more unmanageable figure over the coming months.
The IRS only grants a penalty-free extension if your payment covers at least 90% of your total tax liability by the April deadline. If your estimate is too low and you underpay beyond that threshold, the failure-to-pay penalty is applied retroactively to the entire unpaid balance from April 15th.
How to calculate your estimated tax liability
To arrive at a reliable figure without having completed your full return, follow these steps:
1. Collect all forms of income earned throughout the year, including:
2. Apply the safe harbor rule. This means paying:
3. Use a tax estimator tool.
The IRS Tax Withholding Estimator is best if you’re a W-2 employee. And if you’re self-employed, a self-employed tax calculator can help you factor in the 15.3% self-employment tax on top of income tax.
4. Account for deductions and credits.
Subtract above-the-line deductions (such as Student Loan Interest or HSA contributions) to find your Adjusted Gross Income. Then, subtract either the standard deduction or your estimated itemized deductions to find your taxable income.
(There are a lot of factors to balance here, I know. So, if you’d rather someone who does this for a living take the time to figure it out for you, my door is open: booknow.appointment-plus.com/7rxplj6m/).
Most taxpayers focus on the numbers on their final W-2 of the year. But overlooking off-paycheck taxable events is a big way to trigger a failure-to-pay penalty.
To make sure your extension payment is accurate, you need to look beyond your primary employer and audit your financial year for these commonly missed events:
1. Capital gains and digital assets
Selling stocks, bonds, or cryptocurrency can create a massive tax spike. For the 2026 tax year, the IRS has expanded reporting requirements for digital assets, meaning these transactions are more visible than ever. Even if you haven't received the paperwork, you must estimate the gains to avoid an underpayment surprise.
2. Side-hustles and gig work (1099-K & 1099-NEC)
Income from platforms like Uber, Etsy, or freelance consulting often has zero tax withholding. You are responsible for both income tax and the 15.3% self-employment tax. (Forgetting this shadow tax is the number one reason extension estimates fall short.)
3. Interest and dividends (1099-INT & 1099-DIV)
High-yield savings accounts and brokerage dividends might seem small, but in a high-interest rate environment, they can add thousands to your taxable income.
4. Retirement account activity
If you took an early withdrawal from a 401(k) or converted a Traditional IRA to a Roth IRA, you’ve created a taxable event. These actions often carry heavy tax weights that aren't reflected in your monthly paychecks.
Again, I always tell my Staten Island clients to rely on the safe harbor rule here: By paying 100% (or 110%) of what you owed last year, the IRS generally waives the underpayment penalty even if your actual bill for this year ends up being much higher.
A common and costly mistake I see among taxpayers is assuming that filing a federal tax extension automatically covers their state obligations. In reality, tax laws vary significantly by state. And assuming uniformity can lead to failure-to-file penalties at the state level.
Some states do grant an automatic extension if you have a valid federal one. But others require a separate state-specific filing or a state-level payment by the original deadline to keep the extension valid.
If your state is one that requires a separate action and you miss it, you could face state penalties (that are often more aggressive than federal rates).
How do state tax extensions work?
There are three distinct categories of state extension rules. And knowing which category your state falls into is the only way to avoid surprise notices.
1. States with automatic extensions.
Some states (like California or Wisconsin) grant an automatic extension to all residents regardless of whether a federal extension was filed. But you must still estimate and pay your state liability by April 15th.
2. States that mirror federal extensions.
States like New York generally recognize your federal extension, but only if you have no balance due. If you expect to owe state taxes, many of these states require you to file a specific state form and submit your payment simultaneously to avoid late-filing status.
3. States requiring separate filings.
States like Pennsylvania or Tennessee require their own unique forms. If you rely solely on your federal Form 4868, these states will consider your return late the moment the April deadline passes.
How to protect your state filing status when filing a tax extension
To ensure you aren't blindsided by state-level penalties, follow this three-step verification process:
While a federal extension buys you until October 15th to submit your paperwork, waiting until the final hour is a high-risk strategy that can lead to compounding financial and administrative headaches. Filing too close to the October deadline creates several disadvantages:
And beyond just avoiding risks, filing early could help you maximize your tax savings. Because you get to secure my full attention as your tax pro during the least stressful months of my year.
This could benefit you in three key ways:
Filing for a federal tax extension is a strategy for accuracy and control. Not a way to push your return out of your mind even longer.
Your estimate matters, your payment matters, your state filing matters, and your follow-through definitely matters.
But you don’t have to figure all of that out solo. Grab a time to talk to me, and we can help you wherever you’re at: whether you’re not sure how much to pay, you know you can’t afford your balance, or you just want to get filed early so you can secure the most savings.
booknow.appointment-plus.com/7rxplj6m/
“How can I confirm the IRS received my tax extension?”
If you filed electronically, you should receive a confirmation email from your software provider or a Submission ID within 24–48 hours. If you are unsure, the most reliable method is to log in to your IRS Online Account at IRS.gov. Once logged in, check your tax records or transcript to see if Form 4868 has been processed.
“Can I get an extension without filing Form 4868?”
Yes. If you make a full or partial tax payment electronically using IRS Direct Pay, the Electronic Federal Tax Payment System, or a debit/credit card, you can select "Extension" as the reason for payment. The IRS will automatically grant you an extension to file without requiring a separate Form 4868.
“What should I do if my tax extension is denied?”
Extension denials are rare and usually caused by a typo in your Social Security Number or a name mismatch. If the IRS rejects your extension, you generally have a five-day grace period from the date of the rejection to correct the errors and resubmit it. If you miss this window, you must file your full return as soon as possible to minimize late-filing penalties.
“If I overpaid my extension estimate, how do I get my refund?”
You’ll claim the amount you paid with your extension as a payment on your final tax return. If that payment, combined with your withholdings, exceeds your actual tax liability, the IRS will issue the excess as a refund or allow you to apply it toward next year’s estimated taxes.
“Can I get tax penalties removed if I missed the April deadline?”
Yes, you may qualify for the IRS First-Time Abate (FTA) program. If you have a clean compliance history for the past three years (meaning no penalties) and have filed all currently required returns, you can request a one-time administrative waiver of the failure-to-file and failure-to-pay penalties.
“I live in a disaster area. Do I still need to file an extension?”
If the IRS has declared a federal disaster area for your location, you’ll receive an automatic extension to file and pay without filing for a federal tax extension using Form 4868. But you should always check the Tax Relief in Disaster Situations page on the IRS website to see if your specific county and the 2026 deadlines have been officially postponed.
