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IRS.gov Website
Publication 3
taxmap/pubs/p3-011.htm#en_us_publink100050245

When Is the Latest I Can Pay My Tax?(p27)

rule
You always should pay your tax by the regular due date for filing your return. An extension of time to file does not mean you have an extension of time to pay any tax due. You must estimate your tax due and pay it by the regular due date for the return unless you qualify for one of the extensions described in Can I delay my payment of income taxes next. You do not have to send in any payment of tax due when you file Form 4868. However, if you pay the tax after the regular due date, you will be charged interest from the regular due date to the date the tax is paid. You also may be charged a penalty for paying the tax late unless you have reasonable cause for not paying your tax when due.
You can pay your taxes by authorizing an electronic funds withdrawal from your checking or savings account. For the various ways to electronically pay your taxes, see your tax return instructions or visit IRS.gov/payments. Or you can mail a Form 1040-V with the payment. See Form 1040-V and its instructions at IRS.gov/form1040v.
taxmap/pubs/p3-011.htm#en_us_publink100050110
Can I delay my payment of income taxes?(p27)
If you are a member of the Armed Forces, you may qualify for an extension of time to pay income tax that becomes due before or during your military service.
If you serve in a combat zone, have qualifying service outside a combat zone, or are outside the United States in a contingency operation, you may be eligible for the extension discussed in Are There Filing, Tax Payment, and Other Extensions Specifically for Those in a Combat Zone or a Contingency Operation, later.
If you don't meet the criteria detailed in Are There Filing, Tax Payment, and Other Extensions Specifically for Those in a Combat Zone or a Contingency Operation, you still may be able to extend the time to pay your tax. See Can I Get an Extension To Pay My Tax If I Am Not in a Combat Zone or a Contingency Operation, later.
Deposit
If you are unable to pay the tax owed by the end of the extension period, you may want to ask the IRS for an installment payment agreement that reflects your ability to pay the tax owed. To do that, go online to IRS.gov/Payments, call, or you may also download and file the Form 9465, also available at IRS.gov.