The below information applies for both US taxpayers and nonresident aliens (non-US taxpayers).

While you cannot receive payments until you add verified taxpayer information, your posts can accumulate new earnings for up to one month. You will be eligible to receive payments if you add your taxpayer information within 180 days from the first day that nonzero earnings are posted to your Partner Program dashboard. After those 180 days have elapsed, your funds will be forfeited.

Read more at:

https://help.medium.com/hc/en-us/articles/360011483893-Will-I-still-earn-money-if-I-don-t-add-my-taxpayer-information-