One of the biggest hurdles for a homeowner who wants to buy the next house and keep the current one as a rental has always been qualifying with both properties in the picture.
Fannie Mae just made an important change that could make that conversation much easier for some buyers.
The September 2, 2026 Selling Guide update created specific policy for rental income from a departing residence. That means the home you live in today may be treated differently when you plan to convert it into an investment property while buying a new primary residence.
Here is the part that matters most: for a qualifying departing residence, Fannie Mae now allows market rent to be established without first relying on a newly signed tenant lease. The departing residence policy uses permitted market rent documentation instead.
For the right St. Louis homeowner, that could remove a very real timing problem.
Quick Answer: What Did Fannie Mae Change?
A homeowner who plans to convert a current primary residence into a rental may be able to use documented market rent when qualifying for the next primary residence, subject to Fannie Mae eligibility, calculation, reserve, and underwriting requirements.
Instead of finding a tenant before the move and using a new lease to prove rent, the lender may establish market rent through permitted documentation such as an appraisal with market rents, Form 1007, or qualifying market analysis.
That does not mean everybody qualifies. It also does not mean 100% of projected rent becomes extra qualifying income. The math and the borrower’s complete file still matter.
| Thinking About Keeping Your Current Home? Do not assume you have to qualify carrying both full housing payments. We can look at your existing payment, realistic market rent, reserves, and the numbers on the next home before you decide whether to sell. Talk through your departing residence numbers |
Why the Old Process Could Be Awkward
Picture the real world version of this decision.
You are still living in your current house. Then you find the next house you want to buy. Keeping the old home as a rental sounds attractive, but proving the future rent could create a chicken and egg problem.
A borrower might be trying to line up a tenant before knowing exactly when the purchase will close. That raises obvious questions about move in dates, delays, and what happens if the next transaction changes.
The new departing residence framework can remove that lease timing issue for eligible files by focusing on supported market rent rather than a newly executed tenant lease.
How Can the Market Rent Be Documented?
Fannie Mae’s new policy provides specific documentation methods for determining gross monthly rent on a departing residence.
- An appraisal that includes market rents.
- Fannie Mae Form 1007, the Single Family Comparable Rent Schedule.
- Permitted market analysis using comparable rental data when the guideline requirements are met.
The important shift is simple. We may be able to establish what the home should reasonably rent for without first putting a tenant into the property.
Does Fannie Mae Let You Use 100% of the Rent?
No. The qualifying calculation still has to account for vacancy and ongoing expenses.
When market rent is used, Fannie Mae generally applies a 75% factor to the documented gross monthly rent. The departing residence housing expense is then part of the qualifying calculation.
For borrowers without sufficient property management experience, positive rental income is limited to offsetting the property’s PITIA rather than creating unrestricted additional qualifying income. A shortfall can still count against the borrower’s debt to income ratio.
PITIA generally includes principal, interest, taxes, insurance, and association dues when applicable.
A Simple Example
Assume the current home’s total PITIA is $1,700 per month.
Now assume supported market rent is $2,400 per month.
Seventy five percent of $2,400 is $1,800. In this simplified example, the qualifying rental amount is enough to cover the $1,700 departing residence PITIA.
That is a very different qualification picture from simply adding the entire $1,700 old housing payment to the borrower’s monthly obligations.
Change the PITIA to $2,000 while keeping the same $1,800 qualifying rental amount. The file now has a $200 monthly shortfall to account for.
This is why the rule matters, but the math matters even more.
| What Would This Look Like With Your House? Run the new home’s estimated payment first. Then compare it with the current home’s payment and realistic rental potential. The Better Rate Mortgage Payment Calculator is a useful starting point before we apply actual underwriting rules. Run the full mortgage payment |
Should You Actually Keep the Current Home as a Rental?
Qualification is only one side of the decision.
A house that can help you qualify is not automatically a house you should keep. You still need to think like an owner and a landlord.
Market rent, vacancy, maintenance, management, taxes, insurance, HOA dues, financing, and your available cash all affect whether the rental makes financial sense.
That is where our Investment Property ROI Calculator becomes useful. It lets you model rent, vacancy, expenses, cash flow, cap rate, and cash on cash return instead of making the decision from rent alone.
Use the calculator as an educational screen, not as a promise of future returns. Once the property looks interesting on paper, we can match that investment math with the mortgage qualification rules.
Why This Could Be a Big Deal for Move Up Buyers
Plenty of St. Louis homeowners have thought about keeping the current house.
Maybe the existing mortgage has an attractive rate. Perhaps the property would make a strong long term rental. Some homeowners want to start building a real estate portfolio. Others simply do not want to sell an asset they would prefer to hold.
The problem is that carrying two full housing payments can stop an otherwise workable purchase.
This guideline does not magically make everyone qualify. What it can do is remove a documentation obstacle that made some departing residence scenarios harder to execute.
Before deciding what the next home payment looks like, use our St. Louis Affordability Map to see how a comfortable budget translates across local communities.
Reserves Still Matter
The new flexibility does not eliminate reserve requirements.
Fannie Mae’s policy treats property management experience as an important part of how rental income can be used. Borrowers with limited experience may also face specific reserve requirements for the departing residence, in addition to other reserve requirements that can apply when multiple financed properties are owned.
That means cash after closing matters just as much as the down payment.
If you want to see the broader cash picture for the next purchase, run our Cash to Close Calculator. It estimates down payment, closing costs, prepaid items, credits, earnest money, and a reserve cushion.
This Could Change the Buy First or Sell First Conversation
For years, move up buyers have often started with one question: Do I have to sell my current house before I buy the next one?
Sometimes the answer will still be yes.
In other cases, the better question may now be: What happens if we convert the current home into a rental and use supported market rent in the qualification?
That opens a different strategy discussion around timing, equity, reserves, the new payment, and whether the old house is worth keeping.
A homeowner should not keep a property just because Fannie Mae created a path to use rental income. At the same time, they should not automatically sell because they assume carrying the old payment makes the next purchase impossible.
| Before You List the Current House, Run Both Scenarios Selling may still be the smartest move. Keeping the home may be smarter for someone else. The useful answer comes from comparing qualification, rental economics, cash reserves, and the next home payment together. Have Better Rate run the full scenario |
A Note for St. Louis Realtors
Listen for the client who says, “We would love to buy that house, but we have to sell ours first.”
Maybe they do. The new Fannie Mae departing residence policy is a reason to check before building the entire offer strategy around a sale contingency or waiting for the current property to close.
If the existing home has reasonable market rent relative to the payment, the financing conversation may look different than it did under the old documentation approach.
That can change timing. It can change the offer. Most importantly, it gives the homeowner a chance to make the keep or sell decision based on the full picture instead of an assumption.
When Does the New Rule Take Effect?
Fannie Mae published Announcement SEL-2026-08 and the rental income updates on September 2, 2026.
Fannie Mae says lenders may apply the September rental income changes immediately and must implement them no later than November 1, 2026.
During that transition period, lender implementation and overlays can vary. Verify the specific lender’s current treatment before assuming the guideline is available on a particular file.
Bottom Line
This is not a small documentation tweak for the homeowner who wants to move without automatically selling the current house.
The new policy can create a cleaner path to use supported rental income from a departing residence without first solving the tenant and lease timing problem.
There are still qualification rules, reserve requirements, property management considerations, lender overlays, and real landlord economics to review.
But the conversation has changed.
Before you put the current house on the market because you assume you have to sell it, run the numbers both ways.
| Want Me to Run the Numbers? Send me the current property, approximate payment, and what you are thinking about buying next. We can look at the whole picture and see whether the new Fannie Mae departing residence rules create another option. Contact Better Rate Mortgage |
Frequently Asked Questions
Can I use rent from my current home to qualify for a new mortgage?
Fannie Mae’s departing residence policy may allow eligible borrowers to use supported market rent from a current primary residence that will be converted to an investment property. The impact depends on the rental calculation, PITIA, reserves, property management experience, and the complete loan file.
Do I need a signed lease on the departing residence?
The September 2026 departing residence policy provides a market rent documentation path rather than relying on a newly executed tenant lease. The lender must follow the documentation requirements in Fannie Mae’s current Selling Guide.
Does all of the projected rent count as income?
No. Market rent is generally subject to Fannie Mae’s 75% factor, and the treatment of any positive amount depends on the borrower’s property management experience and the applicable departing residence rules.
Do reserves matter?
Yes. Reserve requirements can apply to the departing residence and to borrowers with multiple financed properties. The exact amount should be verified under the current Fannie Mae guideline and any lender overlays.
Is the new policy available now?
Fannie Mae says lenders may apply the September rental income changes immediately and must implement them no later than November 1, 2026. Individual lenders can have different implementation timing and overlays during the transition.
