The direct answer
Investment-property reserves are liquid or near-liquid assets available after closing to support future housing payments and other obligations. Fannie Mae’s current DU minimum-reserve guidance lists six months of reserves for an investment-property transaction, with additional reserve requirements possible when the borrower owns multiple financed properties or when DU’s risk assessment requires more.
Measure reserves after funds to close
Money needed for down payment and closing is not the same as post-closing reserves. Reserve analysis starts with assets remaining after required funds to close are accounted for.
To apply the approach to an editable scenario, use the BRRRR Calculator. For the neighboring question, explore Rental Property Calculator.
Express the requirement in qualifying-payment months
Fannie Mae measures reserves using months of the subject property’s qualifying payment, based on PITIA. This is why a “six-month reserve” amount depends on the property’s housing expense.
Account for multiple financed properties
Additional reserves can apply when a borrower owns other financed properties. The current Fannie Mae framework uses additional calculations based on the number and balances of those properties.
Worked example
If the subject investment property has a qualifying PITIA of $2,500 per month, six months equals $15,000 before considering any additional reserve requirement for other financed properties or lender overlays.
Common mistakes and limitations
Do not assume six months is a universal requirement for every lender, loan program or manual-underwriting scenario.
Refinance eligibility, appraised value, seasoning rules, rates and loan costs are lender-specific and are not predicted by this calculator.
Frequently asked questions
Are reserves the same as the down payment?
No. Reserves are assets available after closing; funds required for down payment and closing are accounted for separately.
Can a lender require more than the agency minimum?
Yes. Program rules, automated underwriting findings and lender overlays can result in different requirements.
Sources and further reading
The article’s examples are illustrative arithmetic. The references below provide context for operating, valuation or transaction concepts; they do not endorse the assumptions or the calculator.
- Fannie Mae — Selling Guide B3-4.1-01, Minimum Reserve RequirementsCurrent reserve definitions and minimum-reserve framework for DU and investment-property transactions.
- Fannie Mae — Selling Guide B3-6-03, Monthly Housing Expense for the Subject PropertyP&I, PITI/PITIA and monthly housing-expense components used in mortgage underwriting.
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