I am going to apply for IRS 6 month automatic extension (Form 4868) for 2017 tax before April 7 to avoid late filing penalty.
Other than IRS Penalty for late filing (5% / month) and late payment (0.5% / month) , does state tax authority also charges similar fine for late filing/payment?
I live in Pennsylvania. In addition to Form 4868, what else I should do to reduce potential penalty imposed by PA State? I remember someone told me before, other than the interest itself (calculated on a daily basis), there is no state-level late filing and late payment penalty like IRS. Is this correct?