The invisible screen
Most rental lenders set a minimum loan amount, a minimum property value, or both. A property below either one is filtered out before an underwriter looks at the deal. The rent could be excellent and the ratio strong; the file never reaches the point where that matters.
Borrowers usually hear this as "you don’t qualify," which is misleading. The property didn’t clear a threshold. That is a very different thing.
Why lenders set floors at all
Originating a loan costs roughly the same in staff time whether it’s small or large. Below a certain size the economics stop working for a lender built around volume, so they draw a line. It’s a business decision about their cost structure, not an assessment of your property.
Which is precisely why the lines differ between lenders, and why the same file gets a no from one and a yes from another.
Voucher rent
Rentals leased through the Housing Choice Voucher program add a second variable. Some lenders count the contract rent in full toward the ratio. Others discount it, or treat the documentation as an obstacle. Since the voucher portion is often the more reliable part of the rent, how a lender treats it can decide whether a deal works.
Lenders with a defined path for the contract documentation don’t treat it as extra friction. Knowing which ones those are, before applying, saves a cycle.
One boundary worth stating: which tenants you rent to and how you screen income is your fair-housing obligation as a landlord. It is not a loan-eligibility question, and a lender should stay out of it.
Appraisal at low values
Comparable sales can be thinner and more variable in low-value markets, and an appraisal that lands under a lender’s floor can kill a deal days before closing even though everything else worked. Some appraisers and some lenders are considerably more comfortable in this range than others. This is a real reason lender selection matters more here than almost anywhere else.
Portfolios
If you own a stack of small doors, running them one at a time is what makes them unattractive, thin profit per loan, and the smallest properties knocked out by value floors before underwriting. Quoting the portfolio as a whole up front tells you which properties clear before anyone touches paperwork, which is a much better use of everyone’s time.