It’s really not that complicated. If they want verification, provide copies of home and income property expenses, such as -
Property taxes for home and income property
Property insurance for home and income property
Home Utilities – gas, electric, water, garbage,
Expenses for income property (such as garbage, exterior electric, water, janitorial, misc other small taxes) plus miscellaneous – repairs (i.e. broken windows, plumbers, etc).
Own a car? Insurance, car payment
Phone bills
Medical bills
What you probably won’t have available is the amount spent on food, clothing and gas (if you have a car), but they can get the big picture based on the above expenses.