Indian working in the US Tax filing as Resident in both countries

How much foreign income is tax free in USA?

$108,700

The Foreign Earned Income Exclusion (FEIE, using IRS Form 2555) allows you to exclude a certain amount of your FOREIGN EARNED income from US tax. For tax year 2021 (filing in 2022) the exclusion amount is $108,700.

How long can I stay outside the US to avoid tax?

330 full days

Generally, to meet the physical presence test, you must be physically present in a foreign country or countries for at least 330 full days during a 12-month period including some part of the year at issue. You can count days you spent abroad for any reason, so long as your tax home is in a foreign country.