There is no way to know what the penalties or interest on the unpaid taxes will be until you have paid the taxes owed. The IRS and State will send a bill in the mail for any penalties and interest owed after they receive the payment.
See this IRS website for penalties and interest - https://www.irs.gov/businesses/small-businesses-self-employed/understanding-penalties-and-interest
There are no penalties or interest if the tax return is being filed with a tax refund or no taxes owed.
