I say this based on personal experience filing in NC.
Following your last question, I looked up the actual regulations in the state in which you reside : New Jersey.
New Jersy -
When a tax return is filed after the due date or the tax due is paid late, penalty and interest charges may be assessed. The late filing penalty is 5% of the tax due for each month or portion of a month the return is late. The maximum penalty for late filing is 25%. The Division may also charge a penalty of $100 for each month the return is late.
A late payment penalty of 5% of the tax due may also be charged.
Interest is calculated at the annual rate of 3% above the prime rate for every month or portion of a month the tax is unpaid, compounded annually. At the end of each calendar year any tax, penalties, and interest still due (unpaid) become part of the balance on which interest is charged.
In addition, if your tax bill is sent to the collection agency, a referral cost recovery fee of 10% of the tax due will be added to the liability. If a certificate of debt is issued for the outstanding liability, a fee for the cost of collection of tax may also be imposed.
It looks like New Jersey is a little different from NC. I am glad that you had me research my answer more.
The sooner that you file, the better it will be for your wallet.
If you still have more questions, don't hesitate to ask.