All income received, by you, since arriving in KY is Ky source income. Whether it be salaries or interest or anything else. For example, If you sold stock on March 15, the capital gain (or loss) would be allocated to KY because that's where you lived when the capital gain was realized. If you took money out of your IRA on December 12, that distribution would be KY income.
If you have no idea what this is, then it is all KY income because that's where you lived most of the year.
