The City of O’Fallon offers a Down Payment Assistant Program to assist low-to-moderate income first-time homebuyers. The program provides zero-interest forgivable $10,000 loans towards the down payment on purchasing a home in O'Fallon. Pre-purchase housing counseling is required for eligibility.
The program is funded through the St. Louis County HOME Consortium. To learn more, please go to the St. Louis County HOME Consortium webpage for O'Fallon.
The household income:
To qualify as low-to-moderate income, the total gross income of all members of the household over the age of 18 must not exceed the set limits, which are established by HUD:
| Occupants in House | Total Gross Income |
| One-Person Household | $56,250 |
| Two persons | $64,300 |
| Three persons | $72,350 |
| Four persons | $80,350 |
| Five persons | $86,800 |
| Six persons | $93,250 |
| Seven persons | $99,650 |
| Eight persons | $106,100 |