The Internal Revenue Service (IRS) filing deadline is April 15th, just around the corner. Are you ready for that? Do you need more time? This guide explains what to do if you miss the deadline. Some key takeaways:
- The IRS filing deadlines are not the same for everyone. Your business entity structure determines when you need to file your business tax return.
- An extension extends the tax filing deadline by six months, but it does not extend the payment deadline. Send in an estimated tax payment to avoid penalties.
- A filing extension is automatic if you submit for it before the deadline, meaning the IRS won’t reject your request as long as you submit the form on time.
Tax season can feel overwhelming for business owners. You’re already under pressure to make critical business decisions for the new year. Personal finances can easily get neglected in the midst of that storm. The good news is that the IRS provides several options for taxpayers who need more time. Contact my office if you need help with any of these.
Know the 2026 tax deadlines for effective tax planning, timely filings, and payments.
Knowing when the tax deadlines are is the first step in tax planning. These dates are not the same for everyone. Your business entity structure determines when to file. For the 2026 tax filing season, these are the key dates to know:
- April 15, 2026: Individual tax returns (Form 1040), including sole proprietors and single-member LLCs who report business income on Schedule C
- April 15, 2026: C corporation returns (Form 1120) for calendar-year filers
- March 17, 2026: Partnership returns (Form 1065) and S corporation returns (Form 1120-S), since March 15 falls on a Sunday (this date may have already passed by the time of this publication).
- October 15, 2026: Extended deadline for individual and corporate returns if you file for an extension by the original due date
The IRS officially opens the 2026 tax filing season on January 26, giving taxpayers nearly three months to prepare and submit their returns. Unfortunately, many business owners are still scrambling to gather missing documents and sift through complex financial records. That pressure is particularly intense for partnerships and S-Corps with returns due in March.
File a tax extension before the filing deadline if you believe that your tax filings may be inaccurate or incomplete.
You can file an extension if you’re not able to get everything together before your deadline date. This will give you an additional six months to file your returns, but the taxes you owe are still due.
It’s best to pay an estimated amount to ensure you don’t end up paying fees and penalties for late payment.
Here are the forms you need to file a business tax extension:
- Form 4868: For individual taxpayers, sole proprietors, and single-member LLCs
- Form 7004: For corporations, partnerships, and S corporations
- Form 8868: For tax-exempt nonprofits
These extension requests must be filed by the original deadline. The extension is automatic, meaning the IRS won’t reject your request as long as you submit the form on time. A CPA can help you calculate a reasonable estimate based on your income and deductions if you’re uncertain about how much you should pay before the initial filing deadline.
Business owners should file, even if they cannot pay off their liabilities in full.
The penalties for filing late are more aggressive than the penalties for paying late, so it’s recommended that you file your return even if you can’t afford to pay the entire balance.
Here’s a breakdown of how the IRS penalty structure works:
Failure-to-file penalties
The failure-to-file penalty is 5% of your unpaid taxes for each month or partial month your return is late, up to a maximum of 25%.
If your return is more than 60 days late, the minimum penalty is $510 for returns required to be filed in 2026, or 100% of your unpaid tax, whichever is less. These fees add up quickly, so it’s best to file your return as soon as possible.
Failure-to-pay penalties
Though less severe than the failure-to-file penalty, the failure-to-pay penalty can still be substantial.
Initial assessments start at 0.5% of your unpaid taxes each month they are late, and unpaid penalties are added to the next month’s balance. The cap on the failure-to-pay penalty is also 25%, and this penalty is subtracted from the failure-to-file penalty if you’re paying both.
Interest compounds daily and can quickly lead to significant tax debt.
Falling behind on your tax payments is an expensive proposition.
The current interest rate on unpaid balances is 7%, compounded daily, and there is no cap on their accrual. On top of that, penalties are assessed on the accrued balance, not the original principal. That means you could be paying as much as 25% on your rising balances. Avoiding that should be a priority.
For business owners expecting a refund, the penalties don’t apply since there’s no unpaid tax. However, you still need to file your return within three years of the original deadline to claim your refund. Otherwise, you’re simply gifting money to the government.
After April 15, 2029, any unclaimed refund for the 2025 tax year gets turned over to the U.S. Treasury.
Can you still claim deductions after the filing deadline?
Will you lose your deductions if you file your taxes late? No, you will not. This is a common question I hear from my clients.
The IRS can’t remove eligibility for business deductions for the 2026 tax filing season. That would require changing U.S. tax law. Anything you’re entitled to before the tax deadline will still be available if you file an extension.
Common business deductions that can be claimed after the business tax filing deadline include the following:
- Equipment purchases and depreciation
- Vehicle expenses for business use
- Home office deductions
- Professional services and contractor payments
- Travel, meals, and other ordinary business expenses
Make retirement contributions before the deadline to preserve deductions.
Traditional IRA and Health Savings Account contributions for the 2025 tax year are also deductible for the 2026 tax filing season, but only if you make them before April 15, 2026. If you are self-employed with a SEP-IRA, your contributions are deductible up until the extension deadline if you file for an extension. That gives you additional retirement fund flexibility and a higher deduction.
If you’ve already filed and find that you missed a deduction or reported income incorrectly, you can file an amended return.
Rushing a return to get it in before the deadline can cause you to make mistakes. In some cases, the original return needs to be amended. Fortunately, the IRS offers a solution for this scenario, and it won’t cost you penalties and fees if executed properly.
Individual taxpayers can use Form 1040-X to correct errors on a previously filed return. There’s no charge and no penalties for filing an amended return, but you may owe interest on unpaid taxes if you’re declaring additional income. You have up to three years to file the amendment.
Before filing an amended return, speak with my team or your current tax professional so that tax planning considerations are accounted for.
Common reasons business owners file amended returns include the following:
- Discovering unreported income from a 1099 that arrived late
- Realizing they missed a significant deduction, like depreciation on business assets
- Needing to correct filing status errors
- Receiving corrected tax documents after filing
Don’t expect a fast response from the IRS. It can take up to six months for them to process an amended return, but it’s worth doing if you expect significant tax savings or are concerned that you could potentially owe taxes and penalties on unreported income. If it’s an honest mistake that you address promptly, the IRS is unlikely to penalize you.
Take advantage of IRS payment options if you cannot pay in full.
Small business owners sometimes hesitate to file a return because they can’t afford to pay the taxes that are due. That’s a mistake because the tax debt doesn’t go away if you delay your filing. The longer you wait, the higher the penalties will be. To avoid them, file your tax return on time and look into one of the following IRS payment options:
- Short-term payment plans give you up to 180 days to pay the full amount without a setup fee.
- Installment agreements allow monthly payments over an extended period, with the failure-to-pay penalty reduced to 0.25% per month.
- If you can demonstrate financial hardship, the IRS may accept less than the full amount owed—this is referred to as an “offer in compromise.”
How do business owners apply for payment plans?
You can apply for these payment plans online at IRS.gov, or you can ask my team for help.
Either way, make sure you contact the IRS as early as possible to avoid interest payments and penalties. Taxpayers who proactively set up payment arrangements generally face fewer enforcement actions and may even qualify for penalty relief.
Take immediate action before the filing deadline arrives.
If you’re reading this and the tax deadline is approaching, the best thing you can do is take action now. Here’s a quick checklist:
- Gather all your tax documents, including W-2s, 1099s, and records of business income and expenses.
- Estimate your tax liability to determine how much you might owe.
- File an extension request if you can’t complete your return on time.
- Pay whatever amount you can toward your estimated tax liability by the deadline.
- Contact a CPA if you need help navigating your options.
Tax deadlines can feel stressful, but they don’t have to derail your financial plans. With the right approach and professional guidance, you can navigate a tight deadline, minimize penalties, and keep your business finances on solid ground.
Schedule a discovery call today, and we’ll put together a plan.
Talk soon,
Jeremy A. Johnson, CPA