When should the "State wages, if different" field on Screen 10, Wages, Salaries, Tips, be used when entering multi-state W2's?


You would only use (16) State wages, if different if the amount of wages for the resident state is more or less than the federal amount. 

Example: The home state does not recognize pretax deductions to taxable wages, so the state taxable wages will be greater than the federal wages that do recognize pretax deductions. An entry in this field will typically cause an adjustment on the State return

See Allocating W-2 Wages and Withholdings for Multi-State Return on how to allocate wages to multiple states.

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