...sorry, not with the Online tax software.
1) IF you use the Desktop software every year, it has a What-IF worksheet that uses that year's income and allows you to transfer and model it for the next year....including changing specific income source amounts
2) ..Desktop also allows you to create multiple tax files, and you can create a new file that uses your expected next year's income instead...though it uses the earlier year's tax rates, that would be pretty close, ( though it wouldn't allow for CARES act 3-year split reporting of certain retirement distributions)
3) or.....try one of the online tax calculator tools:
https://turbotax.intuit.com/tax-tools/
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
