You will have to split your income manually. There is no percentage option.
You must file Form 1040, U.S. Individual Income Tax Return, if you are a dual-status taxpayer who becomes a resident during the year and who is a U.S. resident on the last day of the tax year. Write "Dual-Status Return" across the top of the return.
Attach a statement to your return to show the income for the part of the year you are a nonresident. You can use Form 1040NR, U.S. Nonresident Alien Income Tax Return or Form 1040NR-EZ, U.S. Income Tax Return for Certain Nonresident Aliens With No Dependents as the statement, but be sure to write "Dual-Status Statement" across the top.
Related Resource:
Taxation of Dual-Status Aliens
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