You must prepare a separate tax filing for each tax year. This means you cannot include last year’s income information on the current year’s tax forms. Sprintax Returns provides access to 2023, 2022, 2021, and 2020 tax forms. For earlier years, go to the IRS Prior Year Forms and Publications and print a Form 1040-NR for the tax year you need to file. Be sure to also get the preparation instructions for that year's Form 1040-NR, because the tax rates and exemption amounts are different for each tax year.