Paying Off Loans vs Investing on an Attending Salary - The Math

With a high attending income, you can do both. The question is how to split your dollars for the best long-term outcome. Here is the math.

The Attending Advantage - Enough Income to Do Both

Residents face a genuine tradeoff between loan repayment and investing because the income does not stretch far enough to do both meaningfully. Attendings generally do not have that problem. A physician earning $250,000 to $400,000 per year can, with a reasonable lifestyle, simultaneously maximize retirement accounts, make substantial loan payments, and still build taxable wealth. The question is not whether to do both - it is how to allocate the surplus between them.

The math starts with your loan interest rates. Federal medical school loans borrowed in recent years carry rates between 6.5 and 8.0 percent depending on loan type and year of origination. The long-run expected return of a diversified equity portfolio is roughly 7 to 10 percent annually before taxes. At those rates, the financial case for investing over aggressive loan repayment is not overwhelming - but the tax treatment of retirement accounts tips the scales.

The Tax-Adjusted Return Comparison

When you contribute $23,500 to a pre-tax 403b, you are not just investing - you are also avoiding taxes on that income at your marginal rate. For a physician in the 37 percent federal bracket, every dollar contributed to a pre-tax retirement account generates an immediate 37 cent tax benefit. The effective after-tax cost of that contribution is $0.63 on the dollar. That tax benefit is a guaranteed, immediate return that does not depend on market performance.

Compare that to paying down a student loan at 7 percent. The after-tax benefit of paying off a 7 percent loan when you are in the 37 percent bracket is effectively a 7 percent guaranteed return - meaningful, but lower than the combined return of investing plus the tax deferral benefit of a retirement account contribution. This is why most financial planners recommend maximizing pre-tax retirement accounts before making extra loan payments, even at relatively high loan rates.

The exception is very high-rate debt. Private student loans at 9 percent or above start to compete more seriously with the tax-adjusted return of retirement investing. At those rates, a split approach - maximizing retirement accounts while also making aggressive extra principal payments - is a reasonable middle path.

A Practical Allocation Framework

For a physician not pursuing PSLF with federal loans at 6.5 to 7.5 percent and an attending salary of $300,000, a reasonable allocation of surplus income after taxes and living expenses might look like this. First, maximize the 403b and 457b if available - up to $47,000 combined in pre-tax deferrals. Second, execute the backdoor Roth IRA - $7,000 per spouse. Third, direct remaining surplus toward student loan principal payments, targeting payoff within five to seven years of finishing training. Once loans are paid off, redirect that cash flow into a taxable brokerage account.

This sequence captures the full tax benefit of retirement accounts, builds tax-free Roth wealth, and eliminates debt on a reasonable timeline without sacrificing investment compounding. The specific numbers shift based on your loan balance, interest rate, specialty income, and risk tolerance - but the sequencing principle holds for most attendings not on a PSLF track.

When Aggressive Loan Payoff Makes More Sense

The math favors investing in tax-advantaged accounts first, but the math is not the only input. Some physicians place high value on the psychological and financial flexibility of being debt-free, particularly when carrying $300,000 to $500,000 in student loans. Eliminating that liability quickly reduces monthly cash flow obligations, simplifies financial planning, and removes a significant source of financial stress. If a more aggressive loan payoff plan means you are debt-free in three years instead of seven, the cost of that choice in foregone investment returns may be acceptable given the other benefits.

Run your own numbers with your actual loan balance, rates, and income before committing to a strategy. A fee-only financial planner can model the after-tax, after-investment-return comparison specific to your situation and help you make a decision that reflects both the math and your priorities.