If you fail to file a return altogether by the extension date, the IRS penalty increases to 5 percent per month, for a maximum penalty of 25 percent. An easy way to avoid the penalty is to make a tax payment with your debit card before the filing deadline.f you have a death or illness in your family or fall victim to a natural disaster, you may be unable to file on time. While the IRS does not need an explanation when you apply for an extension, there is no reason to prepare your tax return in a rush if other issues keep you from focusing on it.