rbynaker
Level 11
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Not an area I specialize in, but quick research looks promising:

See Subtraction "H":

https://law.lis.virginia.gov/admincode/title23/agency10/chapter120/section102/

H. Foreign source income. If federal taxable income includes any amount that is "foreign source income," as that term is defined in § 58.1-302 of the Code of Virginia, and the provisions thereunder, such amount may be subtracted.

Which reference 58.1-302:

https://law.lis.virginia.gov/vacode/58.1-302/

"Foreign source income" means:

4. Gains, profits, or other income from the sale of intangible or real property located without the United States;

Rick