The timing and number of royalty statements or royalty reports is usually specified in the contract between the publisher and the writer. For printed books, royalty reports are typically issues quarterly. Every publisher has a slightly different format for their royalty reports. Ebook publishers may issue the reports more frequently.

Here are some guides from various publishers about how to read their specific royalty reports. Looking at these guides may help you better understand your own royalty reports; keep in mind that you may have a different royalty rate and royalty agreement with your publishers, and they may report royalties very differently.