Retrospective billing on enterprise contract

Summary

Retrospective billing on enterprise contract

Content

Here is our scenario.

1. We have a service contract which have a billing schedule on monthly basis for 24 months.

2. We will bill like $1000 per month for 24 months.

3. First month and second month are billed for $1000.

4. Then we review and there is a price adjustment to $1100. But this price adjustment will start from the first month onwards.

5. Since first month and second month was already billed, there is nothing we can do for the first and second month.

6. Is there a way that the different $200 in first and second month will add into the third months ($1100+$200=$1300) and $1100 will start on fourth month onwards.