The International Tax Office provides many resources to assist you in meeting your U.S. tax obligations.

The International Tax Guide for Nonresident Aliens includes an overview of the tax filing process, but we understand that filing can be overwhleming. While, the International Tax Office cannot directly help you file or provide personal tax advice, we do have a collection of reliable resources that can answer your questions and help you file your tax returns.

Get help filing your taxes

To assist with U.S. tax return preparation, nonresident alien students and employees who are sponsored by CU have the option to use Sprintax software. 

All eligible international students and scholars will receive an access code to Sprintax Returns through their CU-affiliated email. If you have not received an access code by March 8, 2024, email

Register for an international tax filing webinar

As a nonresident alien, navigating the U.S. tax filing system is daunting. Sprintax is hosting a series of webinars throughout tax season. There, you’ll be walked through everything you need to know about nonresident tax for the 2023 tax year. Topics include who must file, tax residency, FICA, state tax returns, implications of misfiling as well as how to use Sprintax to prepare an accurate tax return.

Select a time and date to save your spot:


All filers should review the IRS information pages on:

Additionally, the IRS Volunteer Income Tax Assistance (VITA) program offers free basic preparation services through for those who qualify based on income, disability or limited English fluency.

You can find Colorado state tax resources to the right, but for those who need state tax filing resources for states other than Colorado, see this state-by-state list of relevant taxing authorities.