If this is standard one, then the online answer confused me:" If there is any other digit, there would be a 100% chance it was an Itemized deduction".
Or this is for past years when standard deduction is zero. It is not applicable for 2021 and after years.
That is right and is for every year even 2023. If the amount on line 12 ends in a zero (the last digit) it is 99% sure it used the Standard Deduction. All the Standard Deduction amounts end in a zero like your 25,100. There are a couple situations that the SD can end in a digit other than 0. Like if you are a dependent.
If line 12 ends in a number other that zero like 26,187 that usually means you took the Itemized Deductions and would have Schedule A.
