How Is Voucher Amount Calculated?
The first step in determining the voucher amount, is to calculate the Fair Market Rent for the area. Each year HUD comes up with this number for over 2,500 areas of the country. When calculating this number, HUD looks at all units that have been rented in that specific area over the last 15 months.
To calculate, simply divide your annual gross income by 40. Another rule of thumb is the 30% rule, meaning that you can put 30% of your annual gross income in rent. If you make $90,000 a year, you can spend $27,000 on rent, and so your monthly rent should be $2,250.
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The payments cover some or all of the voucher holder's rent. On average, each household will pay somewhere between 30% and 40% of its income on rent.
What You Need to Know About How Section 8 Really Works - ProPublica