If you filed for an extension on your 2024 tax return back in April, time is running out. October 15, 2025, marks the final deadline for extended federal returns, and missing it could cost your practice thousands in penalties and interest.
Why This Deadline Matters for Your Practice
The extension you filed in April wasn’t permission to delay thinking about your taxes. It was simply extra time to file your return. Any tax you owed was still due on April 15, and interest has been accumulating on that balance ever since at roughly 0.5% per month.
If you miss this deadline, the IRS will assess a late filing penalty of 5% of any tax due for each month (or partial month) your return is late, capped at 25% of the total tax owed. For a practice owner with significant tax liability, that penalty can quickly reach five figures. Most states follow the same October 15 deadline and impose their own penalties for late filing.
Common Reasons Dental Practices Run Late
Missing K-1s from Partnerships or S-Corporations
Many dentists have investments in real estate partnerships or group practices structured as S-corps. These entities have September 15 filing deadlines (September 30 for trusts). If you’re still waiting for K-1s, contact those entities immediately.
Complex Practice Transitions
Did you buy into a practice, sell ownership, or restructure your entity in 2024? These transactions create complicated tax reporting that takes time to properly document.
Incomplete Practice Financial Records
If your bookkeeping wasn’t maintained throughout the year, reconstructing your practice finances takes considerable time. This is especially true for equipment purchases, build-outs, or significant expenses needing proper documentation.
What Happens If You’re Not Ready
There are no additional extensions available beyond October 15 for most taxpayers. The only exceptions are for those in Presidentially declared disaster areas.
The late filing penalty begins immediately at 5% of the tax due and increases each month. Combined with interest accumulating since April, your total penalty and interest charges can exceed 30% of your original tax liability if you delay several months. State tax authorities impose their own penalties on top of federal penalties.
Steps to Take Right Now
Gather All Missing Documents Immediately
Don’t wait for documents to arrive. Proactively contact anyone who owes you tax forms, whether K-1s from investments, 1099s from side income, or documentation of practice expenses.
Review Your Practice Records
Ensure your practice bookkeeping is complete and accurate through December 31, 2024. Reconcile all bank and credit card accounts. Verify that all equipment purchases and major expenses are properly documented.
Contact Your CPA Now, Not Next Week
If we’re preparing your return, we need at least one week before October 15 to review information, prepare the return, and allow time for your review and signature. Calling on October 14 doesn’t leave time for proper preparation.
Understand Your Payment Options
If you owe tax and cannot pay the full amount, contact us to discuss payment plan options. The IRS offers installment agreements that can prevent more severe collection actions.
Special Considerations for Dental Practice Owners
SEP-IRA Contributions
If you’re self-employed or operate as a sole proprietorship or partnership, October 15 is your last chance to establish and fund a SEP-IRA for 2024. This can provide significant tax deductions that reduce your current year liability. Unlike traditional and Roth IRAs (which had an April 15 deadline), SEP-IRAs follow the extended return deadline.
For practice owners with significant income, maxing out a SEP-IRA contribution can save tens of thousands in taxes.
Foreign Bank Account Reporting (FBAR)
If you have foreign financial accounts totaling more than $10,000 at any point during 2024, you must file FinCEN Form 114 electronically by October 15. This applies even if those accounts didn’t generate taxable income. Failure to file FBAR can result in severe penalties.
If You Miss the Deadline
File your return as soon as possible. The penalty stops increasing once you file, even if you haven’t paid the full tax due. A return filed on October 20 faces far less penalty than one filed in December.
If you have reasonable cause for the delay (serious illness, natural disaster, death in the family), document it thoroughly. The IRS may waive penalties if you can demonstrate reasonable cause. Work with your CPA to request penalty abatement if appropriate.
Planning Ahead for Future Years
The stress of October deadlines can be avoided with better planning. Maintain organized records monthly rather than scrambling at year end. Use accounting software designed for dental practices that automatically categorizes transactions and tracks deductible expenses.
Schedule mid-year tax planning meetings to review estimated tax payments, discuss major purchases or practice changes, and identify tax-saving opportunities while there’s still time to act on them.
Take Action Today
October 15 will arrive faster than you think. If you’re on extension and haven’t filed, the time to act is now, not next week. Contact us immediately to ensure you have adequate time to prepare an accurate return and avoid costly penalties.