Filing a tax extension can feel like a pressure release valve for taxpayers who are missing paperwork, dealing with complex income or simply need more time to prepare an accurate return.
But tax professionals say extensions are often misunderstood. The wrong assumptions can turn extra time into a more expensive tax bill.
Here are seven mistakes to avoid when you file a tax extension to save you on penalties, interest and unnecessary financial stress.
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One of the most common and costliest mistakes taxpayers make is believing an extension postpones when your taxes are due, said Ruth White, enrolled agent (EA) and chief financial officer of White Sands Tax Services. “An extension gives you more time to file the return, but any taxes owed are still due by the original deadline — typically April 15,” White added.
If you do not pay enough by that deadline, interest and penalties can start adding up even if your extension was filed correctly.
Olivier Wagner, certified public accountant (CPA), EA and founder of 1040 Abroad, called this assumption a “huge trap” as the IRS “has not yet finished with their money even before the initial deadline.”
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The next big mistake is filing the paperwork but sending little or no money, White said. “Another is extending without a plan, meaning no estimate of what they owe, no budget set aside and no clear timeline to finish the return.”
In Wagner’s work with expats, he has seen small tax bills mount quickly because of how long it took for the taxpayers to pay. “I do not get used to their horror-stricken faces when receiving the notice,” he said.
Many taxpayers are surprised to learn how quickly unpaid balances grow, even when an extension is properly filed, making the final amount owed “higher than it needed to be,” White said. “It can also create cash flow stress later because you are trying to catch up while the balance continues to grow.”
Interest and late-payment penalties apply to unpaid balances, not to whether the return itself was extended. Getting educated can help taxpayers understand the mechanics of these charges and avoid being caught off guard later in the year.
An extension can increase risk if it leads to procrastination rather than better preparation, White warned. “Waiting can lead to missing documents, overlooked income or rushed assumptions later, which increases the chances of errors and IRS notices,” White said.
