Hello and thank you for using Just Answer,Unfortunately, upon entering the US there would not be a step up in basis. Section 877A(h)(2) provides that, solely for purposes of determining the tax imposed by reason of section 877A(a), property that was held by a nonresident alien on the day that individual first became a resident of the United States (within the meaning of section 7701(b)) will be treated as having a basis on such date of not less than the fair market value of such property on such date. The Section 877A deals with expatriation rules. They woudl apply if you were to leave the US years later after being a resident alien. Then, if you still held the property, you would need to look from the date of your US resident status and the date you leave the US to see if any tax would be owed.
The basis if sold while US resident would be determined on your investment in the asset and how long you held it.
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This is what I expected but it is just as well to have it confirmed Thank You