Starting November 1, 2026, Fannie Mae is overhauling how rental income on your current home can help you qualify for a new primary residence — and the two changes every homeowner should understand are how that rent is calculated and how much cash you may now need in reserve. Fannie Mae's SEL-2026-08 announcement puts this on a firm timeline: lenders are encouraged to implement the updates immediately, but they become mandatory for all loans with application dates on or after November 1, 2026 (SEL-2026-08). If you are planning to buy your next home in the next year, this directly affects your purchasing power and your down-payment-plus-reserves strategy.
For years, the standard approach was simple: sign a lease on the old house, bring the lease to your lender, and use 75% of that rent to offset the mortgage on the home you were leaving. The new framework keeps the 75% math but changes everything upstream of it. A signed lease on your departing residence is no longer the measurement that matters — market-supported rent is. And for borrowers without management experience, a six-month PITIA reserve is now required. Below, I break down what changed, how the calculation actually works, and what it means for homeowners, Realtors, and investors.
Why a signed lease may no longer be enough
The biggest shift is the source of truth for qualifying rent. Under the updated Selling Guide, the lender must determine monthly gross rental income using a complete appraisal report that includes market rents, a Single-Family Comparable Rent Schedule (Form 1007), or market analysis tools such as Zillow, Redfin, or the MLS — obtaining at least three comparable rental properties. The note is direct: "Lease agreements are not permitted for any departing residence."
Practically, this means the rent you intend to charge — or the lease you already signed — is not the number the lender uses. What matters is what the market is actually supporting for comparable homes in your area. This closes a familiar workaround where an above-market lease between friends or family could inflate qualifying income.
How the 75% calculation actually works
To arrive at qualifying rental income, the lender multiplies the monthly gross market rent by 75% to get an adjusted net rental income amount, then subtracts the PITIA (principal, interest, taxes, insurance, and assessments) for the departing residence. The 75% factor accounts for the vacancy, repairs, and tenant turnover the owner absorbs. The reason this is good news: it gives you a defensible, documented number a lender can actually underwrite, rather than relying on whatever rent you and a tenant agree to on paper (Fannie Mae Selling Guide).
Had the market rent been $3,000 a month, 75% equals $2,250, which offsets the $2,200 PITIA and “leaves a positive $50.” Crucially, Fannie Mae limits positive rental income on a departing residence to offsetting the PITIA only — that surplus does not become extra qualifying income to help you buy a bigger home. It can never increase your total income. If the number is positive, it simply relieves the departing-residence payment from your DTI; if negative, it digs into your ability to qualify.
The new reserve rule: six months of PITIA
Here is the second change homeowners feel most directly. If you have less than 12 months of property-management experience, the lender must verify six months of reserves to cover the PITIA on the vacated property — in addition to any reserves already required for multiple financed properties (Fannie Mae Selling Guide). The good news for experienced owners: documented experience removes that six-month burden, so the cash that would have sat in reserve can stay in your pocket or go toward your closing costs instead.
This matters even for a 1-unit primary residence, which historically would not normally require reserves. In other words, a first-time landlord who keeps the old house and buys a new one may now need six months' worth of that property's full payment sitting in liquid funds — on top of the down payment and closing costs.
What homeowners should know before November 1, 2026
Three details pull the rules together, and the first is easy to miss. The new treatment also applies to investment properties you acquire within 45 days of the new loan application. If you bought a rental recently and are now applying for a new mortgage, that property falls under the same market-supported rent and reserve requirements rather than being treated as a separate, already-qualified asset (Fannie Mae Selling Guide).
Second, what counts as documented property-management experience? You generally need 12 consecutive months of owning and renting out income-producing property, with that history verified through tax returns, lease agreements, or mortgage statements. Simply renting the home yourself, or owning property you never rented, typically does not count. If you cannot document that track record, plan on the six-month reserve requirement — and factor it into your cash to close long before you shop for rates.
Third, here is how the changes play out end-to-end. Say you are buying a new primary residence but plan to rent out your current home, which carries a $2,200 PITIA. The appraiser determines market rent for comparable homes is $3,000, so the lender uses 75% of that — $2,250 — to offset the house payment. Because your qualifying rent ($2,250) exceeds the payment, that $2,200 is offset and the small surplus does not add income to help you qualify on the new home. Separately, since you have never managed rentals, you must verify six months of reserves on that $2,200 payment — roughly $13,200 in liquid funds beyond your down payment and closing costs. With 12 months of documented landlord history, that reserve burden lifts, even though the negative-or-positive rental income math still only offsets the departed property's payment.
Edge Home Finance, LLC | Company NMLS #891464
Dylan Crews, Mortgage Loan Officer | NMLS #1987505
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Disclaimer: This article is for educational purposes only and does not constitute individualized financial, tax, or legal advice, nor is it a commitment to lend. Fannie Mae guidelines, market conditions, and your personal financial profile all affect eligibility, qualification, and the reserves or rental documentation a lender may require. Loan programs and underwriting requirements change over time, so confirm current guidelines with a licensed mortgage professional before making decisions.
