Federal taxes owed. How soon to pay ?

Hello,

 

I owe around 5K in federal taxes. I am trying to figure out how soon the taxes owed, should be paid back to IRS ? I specifically want to know if there is a difference between paying the tax today vs (let's say) April 10 (right before the formal April 15 deadline). Are there any interest/penalties in these situations ? Anything else that I should be worried about ?

 

TurboTax already estimated a $30 penalty for insufficient withholding.

 

Thanks!