The Three-Fund Physician Portfolio

Three funds, one hour a year, $68,494 kept

You titrate pressors and read your own films, so a thirty-fund retirement menu should be easy. It is not, and it is not designed to be. Hospital 403(b) menus mix a few cheap index funds into dozens of costlier active funds, and the difference hides in a footnote number: the expense ratio. Across the industry, equity mutual funds offered for sale carry a simple average expense ratio of 1.10%, while flagship total-market index funds charge 0.04% or less (ICI, 2024–2025 data). On $10,000 contributed per year for 25 years at an assumed 7% return, choosing a 0.85% fund over a 0.04% fund costs $68,494 — money that compounds for the fund company instead of for you. This module builds the alternative: a three-fund portfolio — total US stock market, total international stock market, total bond market — that you can assemble from almost any menu, fund automatically from each paycheck, and rebalance once a year between patients. The design goal is not maximum sophistication. It is a portfolio that keeps working during the months you forget it exists.

Total-market index fund

A fund that holds essentially every publicly traded stock in a market, weighted by company size, designed to match the market's return rather than beat it, at a cost near zero.

Every dollar of stock is owned by someone. Before costs, the return of the average actively managed dollar must equal the return of the average indexed dollar, because together they are the market. After costs, the average active dollar must trail — active funds charge more. This is arithmetic, not opinion (Sharpe, "The Arithmetic of Active Management," 1991). A total-market index fund exploits that arithmetic: instead of paying a manager to guess which of 3,500 US stocks will win, you own all of them at their market weights and collect the market's return minus a fee near 0.04%. The winners you would have hoped a manager finds are already in the fund. Selection risk disappears; what remains is market risk, which you are paid to bear. The maintenance burden collapses too: an index fund never fires its star manager, drifts in style, or closes to new investors. You rebalance between your three funds perhaps once a year, and that is the entire job.

Why it matters: Your scarcest asset is attention, and every hour spent evaluating fund managers is an hour of clinical income or recovery you do not get back. The total-market fund converts investing from a recurring decision into a standing order. It also converts cost from a variable you hope is justified into a number you control: roughly 0.04% instead of the 1.10% simple average of equity funds offered for sale.

Thirty funds on the menu, three you actually need

A 403(b) menu is a search problem, not an investment problem. You are hunting for three slots: US stocks, international stocks, bonds. Many hospital menus lack a literal total-market fund, so learn the standard approximations. A 500 index fund covers roughly the largest four-fifths of US market value; pairing it with an extended-market index fund, where offered, rebuilds the total market. For international, look for "Total International," or a broad international index covering developed and emerging markets. For bonds, look for "Total Bond Market Index" or an intermediate-term bond index; if the menu offers only a stable value fund, it can hold the slot with a lower expected long-run return. Ignore fund names that describe ambition rather than holdings — growth, select, opportunities — and read expense ratios instead.

• Download your plan's complete fund list with expense ratios from the benefits portal — the summary page often omits the fees — This week
• Circle every fund with "index" in the name and an expense ratio under 0.15%; these are your candidate list — This week
• Fill the US slot: a total-market index fund, or a 500 index fund plus an extended-market index fund as the closest approximation — This week
• Fill the international slot with a broad international index fund, and the bond slot with a total bond index fund, using stable value only if no bond index exists — This week
• Set contribution elections to buy the three funds automatically at your target weights, and put one annual rebalancing appointment on your calendar — Before your next paycheck

Four funds that are secretly one fund

The most common failure in physician portfolios is not a bad fund — it is the same fund purchased three times under different names. A 500 index fund plus a total US market fund is not diversification: large-caps make up roughly four-fifths of the total-market fund's weight, so the two holdings move almost identically. Active "growth and income" funds are often closet indexers, holding nearly the index portfolio while charging 0.90% for the resemblance. And the word "index" is not a price tag: some menus carry an index fund tracking the same benchmark as a flagship fund but at ten times the cost. A physician holding a 500 index fund, a total-market fund, a closet-indexed active fund, and a large-cap growth fund believes she owns four strategies. She owns one — US large-cap stocks — plus an unnecessary fee on three of the four lines.

How to avoid it: Before adding any fund, name what it holds that your current funds do not. Compare top-ten holdings; if they match, you are buying duplication, not diversification. Treat "index" as a claim to verify against the expense ratio, never as a guarantee of low cost. Add funds only to fill a missing asset class — international stocks or bonds — and hold exactly one fund per slot.

Same index, different price: a one-question audit

Menus reward this specific skill: seeing through fund names to holdings and cost. Test it on a realistic lineup before you audit your own.

Your 403(b) menu lists two funds tracking the same US large-cap index: "Equity Index Fund" at a 0.62% expense ratio and "Institutional 500 Index Fund" at 0.04%. It also lists an actively managed "Select Growth Fund" at 0.92% whose top ten holdings match the index. Which single factor should decide between the two index funds?

1. The expense ratio, because both funds hold effectively the same portfolio — the answer
2. Five-year performance history, because it shows which fund's team executes better
3. Fund size, because larger funds are safer in a market downturn
4. The word "Institutional," because those share classes are reserved for large investors

Two funds tracking the same index differ in one meaningful way: what they charge. Their performance histories will differ by almost exactly the fee gap, so past returns add no information, and fund size does not protect an index fund in a downturn. The 0.58-point difference compounds against you every year. The active lookalike illustrates the adjacent trap — an index portfolio priced at 23 times the cheap fund.

0.85% versus 0.04%: the 25-year bill

You contribute $10,000 per year to your 403(b) for 25 years. Your only decision is the fund: an actively managed fund at a 0.85% expense ratio or a total-market index fund at 0.04%.

Bottom line: At an identical assumed 7% market return, the 0.85% fund costs you $68,494 over 25 years — the fee gap alone consumes more than a quarter of everything you contributed.

The portfolio is simple so your life does not have to be

• A three-fund portfolio of total US stock, total international stock, and total bond index funds captures market returns while costs stay near 0.04%.
• On $10,000 contributed per year for 25 years at an assumed 7% return, a 0.85% expense ratio surrenders $68,494 compared with a 0.04% fund.
• When your 403(b) menu lacks a total-market fund, a 500 index fund plus an extended-market index fund is the standard low-cost reconstruction.
• Overlap is the quiet failure mode: funds holding the same US large-caps add cost and complexity without adding diversification.
• The word "index" in a fund name is a claim to verify against the expense ratio, not a guarantee of low cost.

Do this next: This week, pull your 403(b) fund list, write the expense ratio next to every fund you currently own, and map each holding to one of the three slots: US stock, international stock, or bond.