Understanding 2025 Filing Extensions: How They Work and What They Don’t Do—for Individuals and Small Businesses

Many taxpayers hear “extension” and think it means more time to pay their 2025 tax bill. In reality, an extension only gives you more time to file the paperwork. This article explains when an extension is a smart move, what it actually changes, and how to avoid unnecessary penalties at both the IRS and Maryland levels.

• Why Extensions Are So Common in Busy Seasons

  Life rarely lines up perfectly with tax deadlines. You may be waiting on a late Schedule K-1, a corrected brokerage statement, or final bookkeeping for your business. Or you may simply need more time to work through new rules that affect your 2025 return.

   

  In these situations, filing an extension can be a smart, strategic choice—but only if you understand what it changes and what it doesn’t.

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  What a 2025 Filing Extension Actually Does

  At a high level, a timely filing extension:

  • ☑️ Extends the time to file your tax return, usually by six months (for individuals, from April 15, 2026 to October 15, 2026).

  • ❌ Does not extend the time to pay your 2025 tax; any balance is still due by April 15, 2026.

   

  For most AllTax clients, the common extension forms are:

  •  • Individuals: Form 4868, Application for Automatic Extension of Time to File U.S. Individual Income Tax Return.
  •  • S corporations and partnerships: Form 7004, Application for Automatic Extension of Time to File Certain Business Income Tax, Information, and Other Returns.

   

  Maryland generally follows the federal extension period when certain conditions are met, but details differ. It’s important to coordinate your federal and Maryland extensions so you’re covered in both places.

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  When an Extension Is a Smart Move

  You should consider an extension if:
  • • You are missing key tax documents (K-1s, corrected 1099s, brokerage reports) that will likely arrive after the April 15 deadline.
  •  • Your business books are not fully closed for 2025, and rushing would create a risk of material errors.
  •  • You experienced a major life or business change in 2025 (sale of a business, significant investment activity, large gifts or inheritances) and need more time to plan and document the tax treatment.
  •  • You are dealing with complex new rules (federal or Maryland) and want to be sure your filing reflects the latest guidance.

   

  An extension can be especially useful for pass-through owners. For example, if you are an S corporation or partnership owner waiting on finalized entity returns and K-1s, extending your individual return avoids filing with placeholder numbers that will later need to be amended.

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  What Happens If You Don’t Pay Enough by April 15

  Because an extension does not extend your time to pay, you should aim to pay as much of your expected 2025 tax as you reasonably can by April 15, 2026.

   

  If you underpay, you may face:

  •  • Failure-to-pay penalties from the IRS and Maryland on any unpaid balance after April 15.
  •  • Interest charges that continue to accrue until the tax is paid.
  •  • Possible underpayment penalties if your estimated payments and withholding throughout 2025 were significantly short of safe harbor amounts.

   

  A practical approach is to:

  1.  1.  Start with your 2024 federal and Maryland tax as a baseline.
  2.  2.  Adjust for known changes in 2025 (income, deductions, credits).
  3.  3.  Consider safe harbor rules (for many individuals, paying in at least 100–110% of the prior year’s tax can reduce or eliminate underpayment penalties).
  4.  4.  Make a payment with your extension that gets you close to your best estimate.

   

  AllTax can run projections so your extension payment is grounded in actual numbers, not guesswork.
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  Coordinating Federal and Maryland Extensions

  Federal and Maryland rules are similar but not identical:

  • In many cases, if you file a valid federal extension and owe no Maryland tax, Maryland may treat that as a state extension as well.
  • If you expect to owe Maryland tax, you may need to make a separate Maryland extension payment or file a Maryland-specific extension form.
  • Local Maryland tax (county-level) is tied to your state return, so underpayment or late payment can affect your total bill.

   

  Because state procedures can change, it’s wise to confirm the current-year Maryland extension process before assuming last year’s approach still applies.

  When an Extension Might Not Be the Best Choice

  An extension may not help if:

  •  • You already have all key documents and your situation is straightforward.
  •  • You are tempted to use an extension simply to delay confronting a large expected balance due.
  • • You need recent tax returns for time‑sensitive purposes—such as a mortgage application, student aid, or business financing—and delaying filing could slow down those approvals.

   

  In these cases, filing earlier (even in March) may bring peace of mind and allow more time to plan for 2026.

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  How AllTax Can Help You Use Extensions Strategically

  An extension is a tool, not a failure. Used well, it can help you:

  •  • Avoid filing inaccurate returns during a hectic season.
  •  • Take advantage of planning opportunities that require more analysis.
  •  • Coordinate complex business, investment, and Maryland-specific issues.

   

   

  AllTax Accounting can:

  • Help you decide whether to extend and for which returns (Federal and State(s)).

  • Estimate your 2025 tax and recommend an extension payment that minimizes penalties and interest.

  • Track extended returns and keep you on pace for an October filing that feels orderly, not last-minute.

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