The Conventional Pairing Most Illinois Buyers Skip
Program and regulatory figures verified September 25, 2026. Details change; confirm your scenario with us.
Down payment assistance and conventional financing sound like opposites. On an IHDA file they pair better than most buyers expect, and the credit matrix is the reason.
The case for looking at conventional
The instinct is that a buyer who needs help with a down payment belongs on FHA. IHDA's own rules push back on that in two specific places.
The DTI ceiling
| Score | Conventional | FHA, VA, USDA |
|---|---|---|
| 640 to 679 | 50.00% | 45.00% |
| 680 and above | 50.00% | 50.00% |
For the whole 640 to 679 band, conventional carries five more percentage points of debt ratio on an IHDA file. That band is exactly where assistance borrowers cluster.
The mortgage insurance
The guide notes that FNMA HFA Preferred and FHLMC HFA Advantage may have reduced mortgage insurance, following the automated findings. Reduced coverage on a conventional loan against FHA's premium structure can change the monthly comparison materially.
What is not available either way is lender-paid mortgage insurance, which IHDA excludes on every loan. Borrower-paid monthly, split premium and single premium are all allowed.
The one property type that requires conventional
Community Land Trust purchases are eligible through Fannie Mae or Freddie Mac only. A buyer looking at a land trust property in Illinois is on a conventional first mortgage or nowhere. Property rules.
Everything else is identical
Choosing conventional changes nothing about the assistance itself. Same four programs, same income ladders, same purchase price caps, same minimum investment of the greater of 1% or $1,000, same education requirement, same full appraisal with no waivers, same ban on non-occupant co-borrowers.
The first mortgage type is a financing decision layered under a program decision, and the program decision comes first. Compare the four programs.
Loan size is a non-issue statewide
Per the FHFA conforming loan limits, every one of the 102 Illinois counties sits at the 2026 baseline conforming limit of $832,750 for one unit, with not one county above it. Chicago's typical value of $357,265 leaves $475,485 of headroom. Since IHDA's own purchase price cap of $666,354 binds first anyway, the conforming limit is effectively never the constraint on an Illinois assistance file.
See also the FHA pairing, the full credit matrix, and the price caps.
Frequently asked questions
Can you use down payment assistance with a conventional loan in Illinois?
Yes. IHDA supports conventional first mortgages through Fannie Mae HFA Preferred and Freddie Mac HFA Advantage, alongside FHA, VA and USDA. All four IHDAccess assistance programs pair with conventional financing under the same income limits, purchase price limits and household rules.
Is conventional better than FHA for Illinois DPA?
It can be, particularly between a 640 and 679 credit score. IHDA allows a 50.00% maximum back-end DTI on conventional from a 640 score, while capping FHA, VA and USDA at 45.00% in that same score band. FNMA HFA Preferred and FHLMC HFA Advantage may also carry reduced mortgage insurance coverage following the automated findings, which changes the monthly comparison.
What is HFA Preferred and HFA Advantage?
They are the Fannie Mae and Freddie Mac conventional products designed for housing finance agency programs like IHDA's. The IHDA guide notes that both may have reduced mortgage insurance, and that borrowers should follow the DU or LPA findings. They allow a 50.00% maximum back-end DTI from a 640 credit score on an IHDA file.
Is lender-paid mortgage insurance allowed on an IHDA conventional loan?
No. The guide states that LPMI is not available on any IHDA Mortgage loan. Borrower-paid monthly, split premium and single premium mortgage insurance are all allowed, and reduced coverage may apply on FNMA HFA Preferred and FHLMC HFA Advantage according to the automated underwriting findings.
Can I buy a Community Land Trust property with IHDA assistance?
Yes, but only on a conventional first mortgage. The IHDA guide lists Community Land Trusts as an eligible property type through Fannie Mae or Freddie Mac only, so FHA, VA and USDA financing is not available for that property type on an IHDA file.
Mike Certo · NMLS #260555 · Cornerstone First Mortgage NMLS #173855 · Equal Housing Lender. Educational content about financing, not a loan commitment and not legal or tax advice. IHDA program terms, income limits and purchase price limits are set by the Illinois Housing Development Authority and change; figures here carry the date we verified them and IHDA's own disclaimer applies, that funding and availability are subject to change and are not guaranteed until a complete reservation is placed. Loans are subject to borrower and property qualification.