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Hello,
I found two of your answers about the determination of the status of a factual resident of Canada:
https://madanca.com/learn/canadiantaxforum/relocating-to-us-for-work-temporarily/ and https://madanca.com/learn/canadiantaxforum/will-i-still-be-a-tax-resident-in-canada/.

Provided that the conditions that make a taxpayer a factual resident of Canada under the tie-breaker rules of the US–Canada tax treaty are met, what are the obligations of a taxpayer who is a J-1 visa holder (a trainee, not a student) regarding the payment of FICA (Social Security/Medicare taxes)?

The IRS website states that J-visa trainees are exempt from Social Security/Medicare taxes on wages paid to them for services performed within the United States. However, the exemption does not apply to nonimmigrants in F-1, J-1, M-1, or Q-1 status who become resident aliens for tax purposes. Foreign trainees and other non-student aliens temporarily present in the United States in J-1 nonimmigrant status for less than two calendar years are generally considered non-resident aliens (NRAs) under the residency rules of the Internal Revenue Code (IRC).

If they continue to be classified as NRAs after two calendar years as a result of the application of a tax treaty and report this status to the IRS by filing Form 8833, will they remain exempt from FICA taxes as long as they maintain NRA status and meet other conditions (e.g., work performed under J-1 visa status)?

If this is the case, how can they request their employer not to withhold FICA taxes from their wages? Should they file Form W-8BEN, Form 8233, or another form?

I cannot find any specific reasoning for the two-year threshold. It seems to be based on the assumption that most J-1 visa holders become resident aliens for tax purposes after two years, without considering the possibility of determining residency status under a tax treaty rather than through physical presence.

Could you please provide your opinion on this issue?