Filing a tax extension with the IRS costs nothing if you do it yourself. Individual taxpayers can request an extension for free using IRS Free File, by filing Form 4868 online, or by mailing the form, as long as the request is made by the April 15 deadline

. There is no fee charged by the IRS for submitting a tax extension. However, if you choose to use a third-party service or tax software to file your extension, there may be fees involved. For example, some tax software providers charge fees ranging from about $79 to $139 for federal filing, with additional costs for state extensions or expert help

. Also, some online services that file extensions on your behalf may charge fees, such as around $12.95 for a personal tax extension form through certain providers

. In summary:

• Filing a tax extension directly with the IRS yourself is free

• Using tax software or a third-party service may incur fees typically starting around $12.95 and up, depending on the provider and services used