Buying your next home without selling the one you’re in comes down to one question: will a lender count your current home’s future rental income toward your ability to carry two mortgages? I’m Robbie English, REALTOR and Broker at Uncommon Realty, and through Uncommon Rentals, our Central Texas property management division, here’s how that actually works.
TL;DR: Qualifying for a New Mortgage While Renting Your Current Home
- Lenders typically count 75% of documented rental income toward offsetting your current mortgage payment.
- You’ll need a signed lease, proof of the security deposit, and often a market rent analysis to document that income.
- Your debt-to-income ratio, including the rental offset, generally needs to stay under the lender’s threshold — often around 43% for conventional loans, though it varies by lender and loan program.
- Switching to a landlord insurance policy is typically required before a lender will count the rental income.
- Having a professional property manager in place strengthens your file — it signals a well-run investment, not a side project.
How lenders actually treat rental income
Under standard Fannie Mae and Freddie Mac guidelines, when you’re converting a current home to a rental and buying a new primary residence, lenders generally use 75% of the gross rental income — either from a signed lease or a market rent analysis — to offset the payment on the home you’re keeping. The 25% haircut accounts for vacancy and maintenance costs the lender assumes you’ll have. First-time landlords, in particular, may find that income can offset the existing mortgage payment but not add to overall qualifying income — the exact treatment depends on the lender and your specific documentation.
To use this income, most lenders want to see a signed 12-month lease, evidence the security deposit has been collected, and either an executed lease or an appraisal-based market rent analysis. That documentation is exactly what a property manager provides as a matter of course — it’s not something you have to assemble from scratch under deadline.
Debt-to-income is the number that decides it
Your debt-to-income ratio (DTI) — how much of your monthly income goes to debt payments — is the core number lenders evaluate. Once your rental income is applied to offset your current mortgage, your remaining DTI typically needs to stay under the lender’s limit. For many conventional loans that threshold sits around 43%, though it varies by lender, loan program, credit score, and down payment. Paying down high-interest debt and avoiding large purchases in the months before you apply both help keep this ratio in range.
Getting the timing right
It’s generally stronger to have your current home already leased — or at minimum listed with a property manager — before you apply for the new mortgage, rather than applying first and hoping to lease it afterward. A signed lease and documented rent give the lender something concrete to underwrite against. Confirm with your current lender first, too: some loan programs carry occupancy requirements that affect how soon you can convert the home to a rental.
Insurance and documentation lenders expect
Before a lender will count rental income, most require proof you’ve switched from a homeowner’s policy to a landlord policy, since a standard homeowner’s policy doesn’t cover tenant-occupied risk. Between the lease, the security deposit documentation, the rent analysis, and the insurance switch, this is a paperwork-heavy process — which is exactly where working with a property manager who handles this documentation routinely saves real time.
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Why professional management strengthens your file
A lender looking at a self-managed rental with no documentation sees risk. A lender looking at a property under contract with Uncommon Rentals sees a documented, professionally managed asset — compliant leases, verified deposits, and consistent rent collection. That distinction can be the difference between a smooth underwriting process and one full of follow-up requests.
Common mistakes that slow this down
The ones I see most: forgetting to switch insurance before applying, not having a lease finalized when the lender asks for one, and trying to self-manage the rental while also handling a home purchase — which tends to create exactly the documentation gaps that stall underwriting. Working with an experienced lender and a property manager who coordinate with each other directly avoids most of this.
If you’re weighing this move
I manage rentals for owners across Austin, Cedar Park, Leander, and Round Rock, and I coordinate directly with lenders on documentation for clients going through this exact transition. If you want to know whether your current home and financial picture would qualify, bring me your mortgage details and I’ll help you work through the numbers.
