The tear-off voucher/reminder does not have an amount (their choice to pay half this yr or all of it or something else) Also has taxpayer name/address/social and IRS Ogden address zip 84201-0059.

Letter number is LTR3064C

Or can be paid thru EFTPS and maybe on IRS website

Clients are likely to need hand holding

I did this on my own return and maybe 2 or 3 other clients but I do not remember which ones choose this option either. Therefore an analyzer question would be helpful. I plan to get a few phone calls!