Usually no, not automatically.
Federal Law
A federal extension extends the time to file your federal return. It does not automatically extend the time to file a state return, and it does not extend the time to pay federal tax.
State Law Note
State income tax extension rules are administered under state law. Whether a federal extension also covers your state return depends on the specific state.
Some states provide an automatic state extension or coordinate their rules with the federal extension. Other states require a separate state extension form and do not accept the federal extension by itself. Also, a state may still require payment of any state tax due by the original due date even if it allows additional time to file.
So, you should not assume that filing a federal extension automatically covers your state return. The controlling authority is the applicable state revenue department or tax agency.
Sources
IRS — Topic no. 304, Extensions of time to file your tax return
California Franchise Tax Board — What you need to know for April 15 tax deadline
New York State Department of Taxation and Finance — Instructions for Form IT-370
New York State Department of Taxation and Finance — Income tax applications for filing extensions
Pennsylvania Department of Revenue — REV-276 Application for Automatic Extension of Time to File
This information provided does not, and is not intended to, constitute legal advice.
