Will updating my answers after signing the engagement letter result in additional charges?

Q: Will updating my tax questionnaire after signing the engagement letter result in additional charges?
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​A: Once your engagement letter is signed, your service scope and fees are based on the information you provided at that time. If your updates to the tax questionnaire significantly change the scope of work, for example, adding new income sources, foreign accounts, or other reportable items, an adjustment to your fees may be required. Your tax preparer will communicate any such changes with you before proceeding.