I clicked on the up arrow in the Estimated Tax Refund box to watch the Total Deduction number change as I answered the questions. It changed from 25100 to 26800 to 28500.
So it is starting with the correct 2021 base standard deduction but then increasing it incorrectly for over 65. The 2021 increase for Over 65/Head of Household and Over 65/Single is $1700 so maybe that is where it is getting the +1700 from.
I was trying to figure out if I've had enough tax withheld so far for 2021. I guess I am expecting too much from TaxCaster since it can't even calculate the std deduction amount correctly.
