For tax 2021 return, I noticed that the charity donation did NOT reduce the federal tax due amount at all until the entered donation amount was more than $2,400. For example, if the tax due was $500 before entering charity donation, tax due remained the same $500 after $2400 donation was entered. If I continue to add $200 donation (total donation is $2600 now), I started seeing the federal tax due reduced to $470 from $500. Note that for tax 2020, every single dollar donation helped reduce my federal tax due.
I would like to know why the first $2400 donation has no impact on my 2021 tax return.
Thanks, Brian
