@richfieldmall - while no one can explain "why", there is a 'settle up' section on the 2020 tax return where everything will be reevaluated again, Anything missing will end up on Line 30 of Form 1040 and result in a larger refund (or less tax owed)
$900 is an odd number. for any reason does your 2019 tax return show filing single or separate? or does your spouse have an ITIN and not an SS# - I am just guessing at why the odd number. But again, it will all be reconciling on the 2020 tax return.
