I got a "Late Filing Penalty" from NJ. I filed both Federal and NJ taxes electronically with TurboTax. I filled out and filed extension for Federal back before April 15th.(I have the confirmation Email) My amount due was less than 10% of what I owed annually . I submitted and paid amount due for both Federal and NJ before Oct 15th. Federal charged me interest on what was due and thats all. NJ charged me interest of what was due AND a 25% PENALTY on the amount due !!!!