The 5 Biggest Mistakes Physicians Make When Applying for a Mortgage

Physician mortgage programs offer extraordinary benefits — 0% down, no PMI, student loan flexibility. But the application process still has pitfalls that trip up even financially sophisticated doctors. These five mistakes are the ones I see most often, and each one can cost you thousands of dollars or weeks of delays.

Mistake #1: Only Getting One Quote

This is the single most expensive mistake physicians make. Most doctors hear about physician mortgages from a colleague, contact that one lender, and accept whatever rate they are offered. They assume physician mortgage is a standardized product with uniform pricing. It is not.

Physician mortgage rates vary by 0.25% to 0.50% between lenders on the same day, for the same borrower profile. On a $750,000 loan, a 0.25% rate difference equals $1,875 per year, or $56,250 over 30 years. A 0.50% difference doubles that to $112,500.

The fix is simple: get quotes from at least three to four physician mortgage lenders. The process takes a few hours of phone calls and does not affect your credit score if all inquiries happen within a 14-day window (they are treated as a single inquiry). See our rate guide for what to expect in the current market.

Mistake #2: Refinancing Student Loans Before Closing

Physicians often want to refinance their federal student loans into a private loan for a lower interest rate. The instinct is right — but the timing is wrong if you are about to apply for a mortgage.

Federal income-driven repayment plans (IBR, PAYE, SAVE) produce a monthly payment based on a percentage of your discretionary income. For many physicians, this actual payment is significantly lower than what a privately refinanced loan would require. A physician with $350,000 in federal loans on an IBR plan might pay $2,200 per month. That same balance refinanced privately over 10 years would cost approximately $3,700 per month.

Physician mortgage lenders use your actual monthly payment for DTI calculations. Refinancing from $2,200 to $3,700 adds $1,500 per month to your DTI, which reduces your purchasing power by approximately $200,000. Refinance after you close on the house, not before. For a deeper dive, see our guide on physician mortgages with student loans.

Mistake #3: Ignoring Reserve Requirements

Zero down payment does not mean zero cash needed. Physician mortgage programs require liquid reserves — money available in your accounts after closing. The amounts are not trivial:

• Loans up to $1M at high LTV: 3 months of PITIA (typically $10,000 to $15,000)
• Loans $1M to $1.5M at high LTV: 3 months of PITIA ($15,000 to $25,000)
• Loans above $1.5M at high LTV: 6 months of PITIA ($50,000 to $80,000+)

I have seen physicians go under contract on a home, proceed through underwriting, and discover at the eleventh hour that they cannot meet reserve requirements. The deal falls apart, the earnest money is at risk, and they have wasted weeks. Before you start house hunting, calculate your reserve requirement using our physician mortgage calculator and confirm you have the funds available.

One piece of good news: gift funds from family members are eligible for reserves in most physician mortgage programs. If your parents want to help, a gift toward reserves is often more valuable than a gift toward a down payment you do not need.

Mistake #4: Not Locking Your Rate at the Right Time

Physician mortgage rate locks typically last 45 to 60 days. If you lock too early and your closing is delayed, the lock expires and you may face a higher rate. If you wait too long to lock, rates may rise during your home search.

The optimal strategy depends on your timeline. If you are under contract and have a firm closing date within 45 days, lock immediately. If you are still searching for a home, most lenders offer a float-down option — you lock at today’s rate, and if rates drop before closing, you get the lower rate (usually for a small fee of 0.125% to 0.25% of the loan amount).

The worst outcome is getting caught in a rising rate environment with no lock in place. Even a 0.25% rate increase on a $600,000 loan adds $100 per month to your payment permanently. Ask your lender about rate lock options on your first call, not after you find a house.

Mistake #5: Buying the Maximum You Qualify For

Physician mortgage programs allow DTI ratios up to 50%. On a $350,000 attending salary, that means the program will approve total monthly obligations of $14,583 — enough to buy a $1.2 million home. But qualifying for a mortgage and being able to comfortably afford it are two entirely different things.

The qualification math does not account for retirement contributions (you should be saving 15% to 20% of income), disability and life insurance premiums, student loan payments that will increase as your income grows, practice buy-in costs, or the lifestyle expenses that come with establishing a new household. A physician spending 45% of gross income on debt is one unexpected expense away from financial stress.

A better target is keeping your total housing cost (PITIA) below 28% to 30% of gross income. On $350,000, that means a PITIA of $8,167 to $8,750 — still enough for a home in the $600,000 to $800,000 range in most markets. You will have room to breathe, save, and build wealth rather than being house-poor.