Add all sources of income received in one month
Include salary or wages before deductions if using gross income
Include bonuses, commissions, tips, and overtime pay
Include self-employment income after business expenses if applicable
Include rental income, dividends, interest, and other recurring income
Include government benefits, pensions, alimony, or child support if received regularly
Exclude one-time windfalls unless they are recurring
Use the same time period for every income source
If income varies, calculate an average from several months
Divide annual income by 12 to get monthly income
Divide weekly income by 4.33 to estimate monthly income
Divide biweekly income by 2.17 to estimate monthly income
Sum all monthly amounts to get total monthly income