The strongest evidence you can afford a mortgage payment is that you are already paying something close to it. FHA turns that into a compensating factor with a precise test. It is small, it is strict, and a surprising number of renters qualify for it without knowing.
A minimal increase in housing payment counts as a compensating factor when your new total monthly mortgage payment does not exceed your current total monthly housing payment by more than $100 or 5 percent, whichever is less.
"Whichever is less" is the part people misread. It means the dollar cap and the percentage cap race each other and the smaller one wins.
5 percent is $90, which is less than $100. Your new total payment can be up to $1,890.
5 percent is $125, but $100 is less. Your new total payment can be up to $2,600.
The crossover is a current payment of $2,000, where 5 percent equals $100 exactly. Below that the percentage limits you; above it the flat $100 does.
The payment comparison is only half the factor. You also need a documented 12-month housing payment history with no more than one 30-day late payment. On a cash-out refinance the bar is higher: every payment on the mortgage being refinanced must have been made within the month due for the previous 12 months.
And there is a hard exclusion worth knowing before you plan around this: if you have no current housing payment, this factor cannot be cited at all. Living rent-free with family, however responsibly, gives you nothing to compare against.
Your current payment means your current total mortgage payment or your current total monthly rent. Documentation is the whole game here, so gather cancelled checks or bank statements showing twelve months of on-time rent before an underwriter asks.
This is one of the factors that can take a manual FHA file from 31/43 to 37/47 on its own, or combine with another to reach 40/50. How it stacks against reserves and the other options is laid out on how compensating factors combine, and the reserve rule itself is on cash reserves.
VA thinks about the same idea differently - it lists "little or no increase in shelter expense" as a strength without a fixed dollar test. That comparison is on VA compensating factors.
Source: HUD Handbook 4000.1, II.A.5.d.ix Documenting Acceptable Compensating Factors (Manual), last revised 11/26/2025. Read the section in full before relying on it; FHA policy is set by HUD and changes. Not a commitment to lend.
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