There isn't a one-size-fits-all method for verifying income. The proof of income you request from someone who works for an employer will differ from applicants who are self-employed, for instance.

The income or benefit verification letter can be used for various purposes, including: Proof of Income: You may need the letter to verify your income when applying for a loan, mortgage, rental ...

A benefits verification letter could be required for certain situations. "Because it is an official government document, it can be used as proof of income for financial and legal issues," Thelin says.