First of all, it depends on the time of the two payments and whether it is the same business to decide whether to invoice. So there are several different situations:

Scenario 1: The two payments have a short time span and the business is the same:

Can be issued, you must first obtain the consent of the other party.

Scenario 2: Two payments have a long time span and the business is the same:

You can turn it off. And issue tickets for the same business at different times; But this is not recommended.

Because tax payment follows income, if you invoice together, you can't pay taxes separately. According to the tax regulations, income should be recorded (invoiced) when it is realized, and tax should be declared in the current period.