If You Owe the IRS Money. Unfortunately, your payment is still due by the original April 18 deadline if you owe the IRS taxes. Filing an extension doesn't give you additional time to pay your tax liability, and the IRS charges interest and sometimes penalties on tax payments made after the April deadline.
https://www.thebalance.com/how-to-file-an-extension-3193168
It’s an extension of time to file a complete tax return, not an extension of time to pay taxes owed. In good faith, estimate and report on the extension form what you think you owe for tax year 2015. Late-filing and late-payment penalties are explained on Form 4868: - “Late Payment Penalty.
https://www.forbes.com/sites/greatspeculations/2016/03/22/dont-sweat-the-tax-deadline-just-get-an-extension/
It doesn’t have to be that way: You should have peace of mind to enjoy springtime. This year, the individual 2015 tax return deadline is April 18, 2016 (April 19, 2016 if you live in Maine or Massachusetts), and a six-month extension is available until Oct. 17, 2016. Six-month extension of time to file.
https://www.forbes.com/sites/greatspeculations/2016/03/22/dont-sweat-the-tax-deadline-just-get-an-extension/
Because April 15 falls on Emancipation Day this year, taxpayers get a few more days to file a return or ask for an extension. Credit J. David Ake/Associated Press. EVEN though taxpayers have a few extra days this year to file their federal income tax returns, some still won’t make the deadline.
https://www.nytimes.com/2016/04/16/your-money/tax-return-not-done-file-for-an-extension.html
File Form 4868 instead of your tax return before the deadline. The extension is automatic. When the IRS receives your form, that's the end of it, or at least the end of the extension process. You'll still have to file your tax return, but you now have six more months to do it until October 16, 2017.
https://www.thebalance.com/how-to-file-an-extension-3193168
The standard six-month tax extension allows you to file your tax return after the usual deadline. However, it doesn't buy you more time to pay any taxes you may owe. That means that if you don’t pay your tax balance by the filing deadline (April 18 in 2017), you'll get hit with penalty and interest.
https://turbotax.intuit.com/tax-tools/tax-tips/Tax-Extensions/Income-Tax-Extension/INF12081.html
Filing for an extension is simple and is generally automatic. You don’t need to give a reason for your request. You can do it on paper by sending Form 4868 in the mail. Or you may submit the form electronically using tax preparation software or the I.R.S.’s Free File program, which provides free tax software online.
https://www.nytimes.com/2016/04/16/your-money/tax-return-not-done-file-for-an-extension.html
Filing tax returns on time. Generally, the due date for filing your income taxes is April 15. However, in 2017, April 15th falls on a Saturday. Therefore, the tax deadline has been changed to April 18, 2017, which falls on the following Monday.
https://turbotax.intuit.com/tax-tools/tax-tips/Tax-Extensions/Income-Tax-Extension/INF12081.html
After October 15th, you can no longer e-file…. You yawn and wake up from a nice long, relaxing state of hibernation. Somehow you not only missed the April 15th tax filing deadline, you also missed the October 15th tax extension deadline. First reaction: panic.
https://www.priortax.com/filing-late-taxes/can-i-e-file-after-the-deadline/
The deadline for filing the extension is the same as the deadline for filing a return: midnight Monday, in most states. (The calendar has already provided a slight extension: April 15, the usual cutoff, was observed this year as a District of Columbia holiday.)
https://www.nytimes.com/2016/04/16/your-money/tax-return-not-done-file-for-an-extension.html
what is irs deadline to file taxes after an extension filed in april
Filing an extension in April doesn't give you additional time from IRS deadlines to pay your tax liability.