The wording of things can be (and usually is) very misleading to a first timer. One does not "file" quarterly taxes. You "pay" quarterly taxes. Then you "file" a tax return once a year.
you can pay your federal quarterly taxes to the IRS at http://www.irs.gov/payments. If your state also taxes personal income, then you'll need to pay quarterly taxes to your state too. Your state payments would be separate from your federal payments to the IRS. How you pay your state taxes depends on the state, as not all states have the ability to pay online. So check with your state's department of revenue or department of taxation website.
Quarterly tax payment date deadlines for 2019 taxes are:
- 3rd Quarter (June 1- August 31): September 16, 2019
- 4th Quarter (September 1 – December 31): January 15, 2020
The first two quarters don't matter at this point in time.
