@mp5 wrote:
For example, if I do May 5, 2019 to May 4, 2020, the amount due is $0.
However if I do July 15, 2019 to July 14, 2020, I owe over $3000.
The full year amount of the Foreign Earned Income Exclusion is $105,900. For a partial year, it is prorated. The date starting in May has more days in 2019 than the date starting in July, so the May prorated amount is larger than the July prorated amount.
It sounds like your actual foreign income is somewhere between those two prorated amounts, so the May date (larger prorated amount) is excluding the full amount, but the July date (smaller prorated amount) is cause part of your income to exceed the prorated exclusion amount.
