This is not a simple answer, but if you are just looking for a quick (albeit insufficient) answer, it is 500 for a limited amount towards a mortgage.
Okay, now to reality. The minimum score of 500 is “by the book”. Lenders may need (and from my understanding are requiring) higher scores in order to secure an FHA loan. My contacts tell me that number is 620 as a rule of thumb.
By the book, the FHA requires 580 for maximum financing, 500 for limited financing, and you are ineligible with a credit score of under 500. In reality, the credit scores required to obtain mortgage financing are much greater. And there are different parameters for people with a non-traditional credit history or those who have been affected by a disaster.
There are also specific requirements that would be required in order to get an FHA loan, such as an FHA certified appraiser and the loans have caps on the amount. Become familiar with all the FHA requirements if interested in this type of loan.
You can email me with any questions and I’d be glad to answer them. Please understand that if you are asking the question, then others are probably wondering as well, so all answers may be posted on the site so everyone can benefit (your information will be kept private and confidential).