EXTENSIONS are for an extension of time to FILE, not an extension to PAY your taxes. If you are going to owe tax with your returns, you should make a payment with your extension(s) of the amount you are likely to owe, or make a reasonable estimate.
IRS EXTENSION (select “make a payment”, then “4868”)
NY EXTENSION (follow online instructions)
NJ EXTENSION (follow online instructions)
CA EXTENSION (only needed if you will owe CA taxes)