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Didn't realize this, but different states have different filing dates for state taxes, as well as different dates when you file for an extension as well. That is, if you live in a state that requires you to pay states taxes. No need to worry if you live in Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington and Wyoming.
For 2017, state filing breaks down like this:
State Tax Filing Deadlines - Due Dates for State Income Tax Returns and Tax Extensions
As for federal filing, it's not April 15th this year, it's April 18th. And if you are filing for an extension to pay, that date to pay will be October 16th, 2017. Just keep in mind you still have to file by 4/18, the extension just gives you more time to pay (if you happen to have a bill).