If the IRS did not accept your extension by April 15, 2015, it is imperative that you efile or file your tax return as soon as possible. You should do this even if you can't yet afford to pay the taxes you owe.he worst penalties are for filing late, so you should go ahead and file your tax return now, even if you can't afford to pay what you owe. After you file or efile your return, you can set up a payment plan with the IRS to avoid further penalties and interest. See Step 3. tax return status.