An extension of time to file is not an extension of time to pay. Once you've requested the extension, you automatically have an additional six months beyond the original filing deadline.The taxpayer is automatically provided a six-month extension of time to file. This is an extension of time to file, not to pay. A tax extension is a request for an additional six months to file a tax return with the IRS. If necessary, you may request an extension of time of up to six months beyond the filing deadline to file your return.