Mainly counsel's time to assess the revised duties and the employer's effort to reissue documents. If the review concludes a different route is needed, costs change materially. Confirm any applicable government fees with the relevant agency rather than assuming the earlier estimate still holds.
Assess before paying to rebuild
Have the change assessed before deciding which documents to rebuild. Ask whether it affects the professional category, employment authorization or only factual wording. Agree with the employer who covers the identified review and preparation costs, then verify any applicable government charge for the procedure actually needed.
Government charges for TN are modest at the port of entry and larger for a Form I-129 petition, especially with premium processing, and current figures live on USCIS Form G-1055 rather than in any adviser's quote. Ask which credential steps are necessary for this occupation and process, rather than purchasing a standard translation-and-evaluation package regardless of need. The spending that changes outcomes is narrow: a credential evaluation where one is required, certified translations, and one early review of how the duties are described. The employer should also identify who pays travel, credential evaluation, licensing, and any later extension costs in the written arrangement.
More spending does not cure a qualification mismatch or establish a licence needed for U.S. practice.