Most compensating factors involve judgment. Reserves do not. FHA publishes a threshold, a formula for what counts, and a list of money that looks like savings but is excluded. If your file is being manually underwritten, this is the factor you can measure yourself before anyone else does.
On a manually underwritten FHA loan, verified and documented cash reserves count as a compensating factor when they equal or exceed three total monthly mortgage payments on a one- or two-unit property, or six total monthly mortgage payments on a three- or four-unit property.
Do not confuse this with the reserves FHA simply requires. A manually underwritten file must already show reserves of one month's payment after closing on a one- or two-unit property, and three months on a three- or four-unit property. That is the floor to be approved at all. The compensating factor sits above it, at three and six months, which is why a file can meet the reserve requirement and still have no reserve factor to cite.
"Total monthly mortgage payment" is the whole payment, not just principal and interest. It includes taxes, hazard and flood insurance, FHA mortgage insurance, and any HOA dues. So the target is larger than most people guess. On a total payment of $2,100, three months is $6,300 - and that has to be left over after closing, not before it.
FHA starts from your total verified assets and takes out four things. What remains is your reserve figure.
Down payment, closing costs and prepaids. Reserves are measured after the loan closes, so everything the transaction consumes is gone.
A gift can cover your down payment, but it can never be counted as your reserves. Money someone gave you does not demonstrate your ability to absorb a shock.
Anything you borrowed is excluded. Reserves have to be yours, not a loan that also needs repaying.
Cash received in a cash-out refinance, or incidental cash back in the transaction, does not count either.
Spending reserves to lower a ratio. Paying off a small debt can move your debt-to-income ratio a little while pulling you under the three-month line. On a file that needs a compensating factor to reach 37/47, that trade can cost you the approval. Work out which matters more before moving any money.
Undocumented balances. "Verified and documented" is doing real work in that rule. A balance that appeared recently with no paper trail is a question an underwriter will ask, and until it is answered it does not count as anything.
Counting the wrong multiplier. Buying a triplex or fourplex doubles the requirement to six months. Investors house-hacking a small multifamily routinely underestimate this.
Reserves are one of the four factors FHA lets you combine to reach higher ratios. How they stack with the others is on how compensating factors combine, and a payment that barely changes is a separate factor covered on minimal payment increase.
Source: HUD Handbook 4000.1, II.A.5.c.i(C) Reserves (Manual) and 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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