For years, the standard Boglehead doctrine felt complete to me. The elegant simplicity of the three-fund portfolio, the relentless focus on costs, the discipline of staying the course—it provided a robust framework that I advocated for with confidence. Yet, a nagging question persisted in my analysis of personal balance sheets, one that the purest interpretations of the philosophy often sidestep: what do we do with the house? For most American families, their primary residence is not just a place to live; it is the single largest asset they will ever own, often dwarfing their investment portfolios, especially in the early accumulation phase. To ignore this massive, illiquid, and uniquely personal asset when constructing a financial plan is to ignore a fundamental piece of one’s economic reality. I have come to believe that a truly holistic Boglehead approach must account for home equity in its vision of asset allocation.
The conventional Boglehead view is that asset allocation should concern itself only with liquid, investable assets—the stocks and bonds held in brokerage and retirement accounts. The home is considered a consumption item, an expense, not an investment. There is wisdom in this separation. It prevents behavioral errors like viewing one’s home as a piggy bank or a speculative vehicle to be traded. It keeps the investment portfolio focused on its purpose: funding future consumption. However, I argue that this view, while prudent in its intentions, is incomplete. It fails to acknowledge the profound impact home equity has on an individual’s overall risk profile, their need to take risk, and their long-term financial security.
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The Home as a Bond-Like Asset
The core of my argument rests on understanding the economic nature of home equity. While a home is not a bond in the traditional sense—it does not pay a coupon and is highly illiquid—it shares critical characteristics with fixed income. Most importantly, it provides a stream of implicit value. Once your mortgage is paid off, you have effectively locked in your housing cost for everything except property taxes, insurance, and maintenance. This is the functional equivalent of a bond that pays a coupon equal to the rent you no longer have to pay. This implicit income stream is incredibly valuable and reduces your future income needs in retirement.
Therefore, I analyze home equity as a conservative, bond-like component of your net worth. It is a non-correlated asset that provides stability. Its value does not move in lockstep with the stock market. During periods of market turmoil, while your stock portfolio may plummet, your home’s value typically exhibits lower volatility and provides the tangible benefit of shelter. This stabilizing effect is precisely the role bonds play in a traditional portfolio. Ignoring it leads to a misdiagnosis of your true asset allocation. An investor might look at their liquid portfolio and see an 80/20 stock/bond split, believing themselves to be aggressive. But if they have significant home equity, their true overall net worth allocation might be closer to 60/40 when factoring in the home’s bond-like properties. This investor is likely taking less risk than they think.
The Impact on Your Need to Take Risk
This re-framing directly influences the second pillar of Boglehead asset allocation: the need to take risk. Your need to take risk is determined by the gap between your current assets and your future financial goals. A larger asset base means a smaller gap, which translates to a lower need to chase high returns.
Consider two prospective retirees, both aiming for a \$80,000 annual retirement income. Both have a liquid investment portfolio of \$1,000,000.
- Retiree A: Rents her home, paying \$2,500 per month (\$30,000 annually). Her portfolio must therefore generate the full \$80,000. Using a 4% safe withdrawal rate as a rough guide, she would need a portfolio of \$80,000 / 0.04 = \$2,000,000. She has a \$1,000,000 shortfall. Her need to take risk is high.
- Retiree B: Owns his home outright. His housing cost is only \$8,000 per year for taxes and insurance. His portfolio only needs to generate \$80,000 - \$8,000 = \$72,000. The required portfolio is \$72,000 / 0.04 = \$1,800,000. More importantly, he has an asset (the home) worth, say, \$500,000. His total net worth is \$1,500,000. His shortfall is smaller, and his need to take risk is correspondingly lower.
By ignoring the \$500,000 home, Retiree B might mismanage his liquid portfolio, taking on more risk than is necessary because he feels behind. Acknowledging the home equity provides a more accurate picture of his financial health and allows him to adopt a more appropriate, and likely more conservative, allocation within his liquid investments.
A Practical Framework for Inclusion
How do we practically incorporate this into a Boglehead plan? I do not advocate for actively trading your home or taking out HELOCs to invest in the market. That introduces unacceptable risk and leverage. Instead, I propose a two-step process of awareness and adjustment.
Step 1: Calculate Your “Total Net Worth” Allocation.
This is an analytical exercise to understand your true financial exposure. First, define your assets:
- Liquid Portfolio (Stocks + Bonds): This is your traditional investable assets.
- Home Equity: Estimate your home’s fair market value and subtract your mortgage balance. Home\ Equity = Home\ Value - Mortgage\ Balance
For the purpose of this model, I assign home equity a role in the “fixed income” portion of your total net worth. It is the most conservative, income-producing part of your personal balance sheet.
Let’s create a hypothetical example. Assume:
- Liquid Portfolio: \$750,000
- Stocks: \$600,000
- Bonds: \$150,000
- Home Value: \$600,000
- Mortgage Balance: \$200,000
- Home Equity: \$600,000 - \$200,000 = \$400,000
| Asset Class | Liquid Value | Home Equity Value | Total Net Worth Value | Total Net Worth % |
|---|---|---|---|---|
| Stocks | \$600,000 | \$0 | \$600,000 | 52.2% |
| Bonds | \$150,000 | \$0 | \$150,000 | 13.0% |
| Home Equity | \$0 | \$400,000 | \$400,000 | 34.8% |
| Total | \$750,000 | \$400,000 | \$1,150,000 | 100% |
This reveals a profound insight. The investor’s liquid allocation is 80/20 (\$600k/\$150k). But their total net worth allocation is 52% stocks, 13% bonds, and 35% home equity. They are far less aggressive than the liquid portfolio suggests.
Step 2: Adjust Liquid Portfolio Allocation Based on Need and Willingness.
This analysis should inform, not dictate, your strategy. You shouldn’t immediately sell all your bonds because home equity is “like a bond.” Instead, use this clarity to make a more informed choice about the risk in your liquid portfolio.
- If your total net worth allocation looks too conservative for your goals (e.g., you have a high need for growth and a long time horizon), you might consciously choose to maintain a more aggressive liquid portfolio (e.g., 90/10) because your large home equity stake provides a solid foundation.
- If your total net worth allocation looks too aggressive or you are nearing retirement, this awareness might give you the confidence to dial back the risk in your liquid portfolio. You may not need to hold 80% in stocks because your home equity has already done much of the “heavy lifting” for your retirement security. You could shift to 60/40 or 50/50, sleeping better at night knowing your overall financial picture is sound.
Caveats and Nuances
This approach is not without its complications. A home is an illiquid asset. You cannot sell a bedroom to rebalance during a market crash. Its value is also uncertain until the moment of sale. This is why I treat this as a planning tool, not a precise accounting measure.
Furthermore, a mortgage adds leverage and complexity. A large mortgage against your home is a negative bond. It represents a future liability that must be serviced. In many ways, paying down a mortgage is a risk-free return equivalent to the mortgage interest rate. For a young investor with a large mortgage and little home equity, their true net worth allocation might be more aggressive than their liquid portfolio suggests, as the mortgage liability amplifies their financial risks. This often strengthens the case for a more conservative liquid portfolio or aggressive debt paydown.
A More Complete Financial Picture
Incorporating home equity is not a betrayal of Boglehead principles; it is a fulfillment of their deepest intent: rational, long-term, holistic financial planning. It moves us from a narrow focus on a single account statement to a broader view of one’s entire economic existence. It provides a more accurate gauge of risk, a clearer understanding of the need to take risk, and ultimately, the confidence to craft a liquid investment strategy that is truly appropriate for your entire financial life. By acknowledging the quiet, bond-like anchor of home equity, we can build portfolios that are not only smarter but also calmer, allowing us to better stay the course that John Bogle himself championed.
