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No frequent flyer miles and credit cards points from sign up bonuses are NOT taxable.
You will only get 1099 form IF you refer someone and get referral points.
https://thepointsguy.com/credit-cards/complete-guide-to-paying-taxes-on-credit-card-rewards/
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Are credit card rewards taxable? - The Points Guy
Do I need to pay taxes on credit card referral bonuses, sign-up bonuses or bank account opening bonuses? Here is the complete guide answering these questions.