Medical professional loans, historically held on bank balance sheets, are gaining traction in the prime private-label Residential Mortgage-Backed Securities (RMBS) market. According to KBRA’s March 16 research report, “What’s up, Doc - Medical Professional Mortgages, A New Niche in RMBS,” it may offer a distinct growth avenue for mortgage professionals.
Medical professional mortgages, also known as physician or doctor loans, are designed for borrowers in the medical field whose financial profiles often rely on employment contracts and future earning potential. “While historically retained on bank balance sheets, growing origination volumes suggest the segment may begin to appear in prime private label RMBS,” the KBRA report states.
For mortgage professionals, this trend highlights a borrower segment poised for expansion as lenders seek to serve early-career physicians with strong earning potential but unconventional underwriting profiles.
KBRA’s analysis points out that physician mortgage programs frequently permit higher loan-to-value (LTV) ratios, higher debt-to-income (DTI) ratios, and more flexible income documentation compared to traditional prime jumbo loans. These programs generally still require full documentation and owner occupancy.
Mortgage loan originators working with doctors, residents, fellows, and other eligible medical professionals may increasingly encounter programs that allow qualification using executed employment contracts or offer letters, sometimes even before a borrower’s job start date. Some lenders also accept 1099 income or offer alternative treatments for student loan obligations in DTI calculations, according to KBRA’s comparison of medical professional mortgage programs with standard prime jumbo loans in Figure 1 of the report.
The report also indicated that hybrid adjustable-rate mortgages are common in physician mortgage programs. KBRA’s authors said that feature is “typically structured with an initial fixed-rate period followed by periodic rate resets.” The report says this structure may align with borrowers expected to refinance or move as their incomes rise over time. KBRA contrasted physician loans with traditional prime jumbo lending, which typically requires historical income documentation, lower LTVs, lower DTIs and stronger reserve requirements, according to the report’s underwriting comparison.
Physician mortgage programs are typically limited to primary residences and often restrict property type and occupancy to reduce risk layering.
The report emphasizes that physician borrowers may not fit conventional underwriting criteria despite their strong long-term credit outlook. The underlying rationale for these programs is that medical professionals generally benefit from high earning potential, low unemployment rates, and upward income trajectories. These factors may offset elevated LTVs, limited reserves, or large student loan balances at origination.
KBRA estimates that medical professional mortgage production entering prime private-label securitization channels could reach approximately $5 billion annually. KBRA said that volume would place the segment “roughly within the same order of magnitude as other niche collateral types in prime RMBS.” For comparison, non-owner-occupied issuance in the prime PLS market totaled roughly $8 billion in 2025, according to KBRA’s report.
The report noted that Sequoia Mortgage Trust 2026-MED1 represents the first standalone physician mortgage deal in the RMBS 2.0 market rated by KBRA. While product-specific securitized performance data is limited, portfolio observations from some lenders indicate historically low default experiences for these loans.
What This Means for Originators
For mortgage professionals, the emergence of physician mortgages in the securitization market signals a specialized product gaining broader visibility. As lenders and capital markets participants increase their focus on high-income borrowers with nontraditional early-career profiles, understanding and offering these products becomes a strategic advantage. Mortgage professionals can leverage this insight to cultivate relationships with medical professionals, expand their client base, and diversify their loan pipelines.
