The state does not require it, however, read the divorce decree / cs order.

Some include the wording that if either party has a "significant" change in circumstance (pay change greater than 10% either as an increase, or decrease in pay)that it has to be reported.

If your SO's order includes that wording he could be held in contempt for not notifying the court of an increase.

If it does not include that wording, you are home free until your BM decides to ask for a review. (Additionally in the state of FL, any review and increase in CS would be from the date she filed for modification, the courts typically will not retroact with the exception of OVER payment.)

In Florida, a request for review can be done every 3 years, unless there are circumstances that would cause child support to be raised or lowered by more than 15%. If you request a review before 3 years, you have to give a reason on why you think a review is necessary.

Per our attorney, we did not have to disclose any information-if the ex wanted to know if he received a raise, etc. she had to file a court motion and request discovery.
The same goes for her-if she gets a job or a raise and did not tell us but we suspect she did, we also would have to file a court motion.

in the cases I have seen, if an increase/decrease is warranted, it retros back to the court filing date of the motion.