Short answer: your asset allocation — how you split money among stocks, bonds, and cash — is the single biggest driver of your investment results, far more than which specific funds you pick. Set it based on your time horizon and how much risk you can actually stomach, then rebalance to it. Everything else is detail.
What is asset allocation?
It’s the mix of asset types in your portfolio — primarily stocks (growth, higher risk), bonds (stability, lower return), and cash. Research consistently finds that this mix explains most of a portfolio’s ups and downs over time. Get the allocation right and the fund choices matter far less.
How do you choose the right mix?
- Time horizon — money you won’t touch for decades can hold more stocks and ride out volatility.
- Risk tolerance — the allocation you’ll actually stick with in a downturn beats a “better” one you’d abandon.
- Goals — retirement, a purchase, or a reserve each call for a different posture.
- Capacity for risk — a stable, high income can support more risk than a variable one.
What about bonds?
Bonds aren’t there to shoot the lights out — they’re there to steady the portfolio and provide safety when you need it. Their job is playing defense: cushioning downturns and holding value for money you’ll need sooner. How much you hold depends on your horizon and temperament, not on chasing yield.
Why rebalance?
As markets move, your mix drifts — a strong stock run can leave you riskier than you intended. Rebalancing (trimming what’s grown, adding to what’s lagged) keeps risk where you chose it and quietly enforces “buy low, sell high.” Pair a sound allocation with low-cost index funds and consistent investing, and most of the job is done.
Frequently asked questions
There’s no one answer — it depends on your time horizon and risk tolerance. Younger dentists with decades ahead can hold more stocks; those nearing retirement typically add bonds for stability. Because a practice is already a big concentrated asset, many dentists lean their portfolio toward diversification and liquidity.
A common approach is to rebalance about once a year or when your mix drifts materially (say, 5% or more) from targets. The goal is to keep risk aligned with your plan, not to time the market. Automating it removes emotion.
Sources
Founder & Financial Planner · Investment Adviser Representative · Series 63 & 65
Ian McGinnis is the founder of Dental Wealth Partners and a fee-only financial planner dedicated to dentists. As an investment adviser representative (Series 63 and 65), he built the firm to give dentists coordinated, fiduciary advice across their practice, taxes, investments, retirement plans, and long-term goals — the whole picture in one strategy. A graduate of Belhaven University, Ian previously worked at Davis Private Wealth, MML Investors Services, and Northwestern Mutual, and is based in the Jackson, Mississippi area. He is the author of The Wealthy Dentist and hosts the Smiles & Cents podcast.
Keep reading
- How should a dentist invest?Most dentists build wealth with a boring, diversified, low-cost portfolio — after maxing tax-advantaged accounts and diversifying beyond the practice.
- Index funds vs. active investing: which is better for dentists?For most dentists, low-cost index funds beat active stock-picking and most active funds after fees. Here’s why — and the narrow cases where active can fit.
- Why your dental practice shouldn’t be your whole retirement planConcentration risk is the quiet danger for successful dentists. Here’s how to think about building wealth beyond the practice.