Sprintax Calculus

A key part of the foreign national payroll process is submitting data via the secure Sprintax Calculus website. All foreign nationals receiving funding from WashU, such as salary, hourly wages, stipends, fellowships, and assistantships, must complete Sprintax Calculus.

• Sprintax Calculus is a secure website used to determine if foreign nationals have any tax benefits based on country of origin/tax residency, length of stay, type of visa, and type of income. Foreign Nationals can be taxed as either non‐resident aliens or resident aliens, depending on their visa status and the length of time they have been physically present in the U.S. The process for determining tax status is called the Substantial Presence Test (SPT).
• By providing accurate and timely information through Sprintax Calculus, foreign nationals ensure compliance with U.S. tax withholding and reporting requirements. This helps foreign nationals avoid potential tax liabilities and ensures any applicable tax treaties or exemptions are applied to the paycheck.
• Sprintax Calculus facilitates proper handling of tax matters related to WashU employment and funding. It ensures compliance with the law for both the foreign national and WashU.

When completing Sprintax Calculus, you will be asked to provide information about your employment at WashU, your foreign and local addresses, and your immigration status history, which includes historical information about previous travel to the U.S. You can access travel history on the U.S. Customs and Border Protection (CBP) website.

Note that information entered intoSprintax Calculus is for WashU use only and is not shared outside of the university. Follow the steps below to complete this process.

Step 1

Welcome email about Sprintax Calculus

Within approximately one week of your hire or start date, you will receive an email from noreply@sprintax.com sent to your Workday email address containing information to access Sprintax Calculus. If your visa is not sponsored by WashU, you should email copies of your work authorization documents to fnis@wustl.edu.

Step 2

Log in to your Sprintax Calculus record

Use the provided information to access your Sprintax Calculus record. See detailed instructions below to log in with a password or your WashU Key.

Step 3

Provide consent for the release of electronic forms

After logging in, the system will ask you to consent to receive forms electronically. We highly recommend you consent to the release of electronic forms to access and retrieve forms and tax treaty documents electronically through Sprintax Calculus . Important: If you do not provide consent, Payroll Services will not be able to electronically deliver any tax or treaty documents to you.

Step 4

Enter data into your Sprintax Calculus record

You will need to provide information about your WashU employment, local and foreign addresses, and immigration status and travel history. See Detailed Instructions below to complete your on how to complete your Sprintax Calculus record.

Step 5

FNIS Support will review your Sprintax Calculus record

If there are any questions, FNIS Support will notify you and provide further instructions.

Step 6

Verification of the Sprintax Calculus record

Once your Sprintax Calculus record is completed, FNIS will advance it to to WashU International Payroll Services for final processing.

Step 7

Final processing by International Payroll Services

International Payroll Services will review your Sprintax Calculus record within approximately one month. They will email will instructions or confirmation of the final processing of your Sprintax Calculus record.

Note: The results of this review will determine your taxes for each paycheck.

Step 8

Keep your Sprintax Calculus record updated

Once the tax analysis of your FNIS record has been completed initially, you should review and update your data during your WashU employment at least once a year. Additionally, please update your FNIS record when you:

After your initial completion of Sprintax Calculus record, you should review and update your data during your WashU employment at least once a year. Additionally, please update your Sprintax Calculus record when you:

• return from traveling outside the U.S.,
• get a new EAD card (such as for OPT),
• get a new passport,
• change your local St. Louis address, or
• make any changes to your immigration status.

Questions

If you have questions about completing Sprintax Calculus, your record is locked, or if you did not receive the welcome email, please contact fnis@wustl.edu for assistance.

Detailed instructions

Detailed instructions for completing your Sprintax Calculus record have been outlined for each section in the online questionnaire. Click the button below for basic information (i.e., logging in, consenting to receive forms electronically, etc.) and to access a step-by-step PDF to submit your data correctly.

Transition from FNIS

Instructions for individuals who used FNIS prior to November 2026

In November 2026, WashU transitioned from the Foreign National Information System (FNIS) to Sprintax Calculus for foreign national taxation. FNIS date was transferred to Sprintax Calculus, as fully and accurately as possible. All affected users were notified on November 2, 2026 to review and update their new records by November 30, 2026.

Only users whose data was transferred during this process should use these transition review instructions. These instructions only apply the first time users review their records in Sprintax Calculus after the transfer. For all later updates, users should refer to the Detailed instructions section above.