Penalties are also based on your prior year's tax liability. The general rule is that you need to pay in 90% of the current tax or 100% of the prior year tax. So if you owe $15,000 this year and only paid in $10,000 you would be subject to the penalty because you did not pay in 90%, but if last year's tax was only $10,000 there will be no penalty due. So maybe find where to put in last year's tax due.
