Deductions & credits
I think I might find a solution, so in my case, I should input like this:
So all the tax occurred in 2019, since all the used ones are from that year, thus no matter I used in 2019 or 2020, all should be inputed as "used" under 2019, rather than input as used separately in 2019 and 2020.
Thus in 2019, my used one should be 7,592 (5,370 used in 2019 + 2,222 used in 2020).
Hope this helps and please feel free to share if you have different opinions.
By this way, seems every form all makes sense then.
