No. The commission you see at the moment you add a TAP link (a higher-commission link from a brand campaign) is the rate you earn until that campaign ends. A change the brand makes later, up or down, only applies to creators who add the link after the change.
Your rate is set when you add the link
Brands can change a TAP campaign's commission rate while the campaign runs. That change only reaches creators who add the link after it happens: the link already in your showcase keeps the rate it was added at. This is different from a standard open collaboration, where the brand sets the rate and can change it for everyone at any time.
A raise doesn't reach your existing link either
The same rule cuts both ways. If the brand raises its rate after you added the link, your existing link keeps paying the rate you locked, and the app doesn't warn you when this happens. If a product's current rate is higher than yours, add the product's link again: your showcase holds one active link per product, so the new link replaces the old one and takes the rate offered at that moment.
Only re-add a link when the current rate is higher than yours. A re-added link takes the rate on offer that day, so re-adding after a reduction moves you down to the reduced rate.
When your rate can change
Your locked rate ends in these situations:
The TAP campaign ends, whether it runs its course or the brand ends it early. The product then returns to standard open collaboration rules, where the brand can change the rate at any time.
TikTok restricts or delists the product.
You remove the link and add it again after the brand changed the rate.
Next steps
Your next question is probably one of these: