How To Renew/Extend/Amend Your TN Visa?
No limit on number of TN visa extensions / renewals if continue to meet requirements. May extend by mail (EOS).
New TN visa application / amended petition may be needed if there are material changes in a TN visa worker's employment.
Can change to TN visa status (COS) by mail from within the U.S.
Must file new TN visa application to change employers, or work for additional employers.