I'm new to bookkeeping however I do understand the basics. I have a client who has overstated their income. I am trying to find the best report to be able to identify the issues.

I ran a report for invoices and received payments and see under several customers there are deposits and/or payments received. I believe the the deposits should of been a payment against the invoice...I'm not sure if I'm reading the report correctly. 

Also what else would cause overstated income and what  reports to I run?

Thank you for your help!