I owe IRS around 20k tax in 2017. The money for tax payment is not ready now. I want to request 6 month extension for 2017 tax. I know I still receive penalty if I cannot pay off the tax by April 17 even though my extension will be granted. So I want to pay IRS multiple times whenever I have some money available.
From above web page, it looks like there is limit for the number of payments to IRS. Most are only 2. I don't know why this limit exists????
I want to pay whenever I have a portion of money owed to pay to reduce further interest/penalty. Am I limited to only pay IRS TWICE before I can pay off all the tax I owe?