How to fill out the California Self-Employment Affidavit Form? Attach copies of your pay stubs for the last two months and proof of any other income.Calculate your California self-employment 1099 taxes for free with this online calculator from Bonsai. Updated for the 2023 - 2024 tax season. Retirement income, and. • military separation payments. Reach out to your lender for assistance. How to apply for forgiveness. We next conducted a visual analysis of hundreds of earned income verification documents submitted across California during one month. Not all forms are listed.