Fixed Income

What Fixed Income Is — and What It Is Not

The term fixed income covers any investment that pays a scheduled, contractually defined stream of interest or principal. Bonds are the most common form: a borrower issues a bond, receives cash today, and promises to make periodic interest payments (called the coupon) before returning the full face value (called par) at a specified maturity date. The word "fixed" refers to the contractual nature of those payments, not to the market price of the bond itself — prices fluctuate constantly.

Fixed income is not a synonym for safe. A bond issued by a financially shaky borrower can lose a significant portion of its value, and even high-quality bonds can decline in price when interest rates rise. Understanding those two sources of risk — credit risk and interest-rate risk — is the foundation of everything else in this discussion.

The Roles Bonds Play in a Substantial Portfolio

Families at the scale covered by this publication rarely hold bonds purely for yield. Three distinct roles come up repeatedly in managing substantial wealth:

• Stability and ballast. High-quality bonds have historically moved differently than equities, softening the overall swings of a diversified portfolio. This correlation and diversification benefit is one reason bond allocations persist even when yields appear unexciting.
• Income generation. Coupons arrive on a predictable schedule and can fund ongoing spending needs — charitable commitments, family distributions, or operating costs — without requiring the sale of appreciating assets.
• Liability matching. A family with a known future obligation — a large gift, a balloon mortgage payment, a private equity capital call — may hold bonds maturing near that date so the cash simply arrives when needed. This approach is sometimes called immunization or cash-flow matching.

Where fixed income fits in a broader allocation is a question addressed in asset allocation and in capital preservation planning. The appropriate role depends on a family's spending needs, tax situation, liquidity requirements, and time horizon — all factors a qualified investment adviser and CPA should evaluate for any specific situation.

Duration and Credit: The Two Big Dials

Duration

Duration is the bond market's standard measure of interest-rate sensitivity — it estimates how much a bond's price changes when interest rates move by one percentage point. A bond with a duration of five years will lose roughly five percent of its market value if rates rise by one full percentage point, and gain roughly the same if rates fall. Longer-maturity bonds carry higher duration; shorter-maturity bonds and bonds with frequent coupon payments carry lower duration.

Sophisticated investors think of duration as a dial. Turning it up increases both potential gain if rates fall and potential loss if rates rise. Turning it down reduces that volatility but generally reduces yield as well. There is no universally correct setting — the right duration depends on the family's investment horizon, liquidity needs, and views on interest-rate risk.

A related concept is convexity, which describes the curvature of a bond's price-yield relationship. Positive convexity means a bond gains more in price when rates fall than it loses when rates rise by the same amount — generally a desirable characteristic, though the market typically prices it in.

Credit Quality

Credit quality measures the likelihood that a borrower will make every scheduled payment. Rating agencies assign letter grades — the highest-rated bonds are described as investment grade; lower-rated bonds, sometimes called high yield or colloquially "junk," carry higher default risk and therefore pay higher coupons to compensate investors for that risk.

The credit spread is the extra yield a corporate or lower-rated bond pays above a comparable-maturity government bond. Spreads widen during periods of economic stress — exactly when investors often most want safety — which is why high-yield bonds sometimes behave more like equities than like traditional fixed income during market dislocations.

The Major Bond Categories

Families at this wealth level typically encounter several distinct bond markets, each with different tax treatment and risk characteristics:

After-Tax Yield: The Number That Actually Matters

A taxable investor comparing a corporate bond to a municipal bond cannot simply compare their stated coupon rates — that comparison is almost always misleading. The relevant metric is tax-equivalent yield: the pre-tax yield a taxable bond would need to offer to match the after-tax return of a tax-exempt bond. Because the calculation depends on the investor's marginal federal rate, state rate, and exposure to the net investment income surtax, the result is specific to each family's tax profile. A qualified CPA should run this analysis for any particular situation.

Beyond the coupon, the cost basis of a bond matters. Bonds bought at a discount to par generate a taxable gain at maturity; bonds bought at a premium can in some cases amortize that premium for tax purposes. For taxable investors, these basis considerations interact with the overall yield calculus in ways that are easy to overlook.

Individual Bonds, Ladders, and Funds

Families frequently encounter a structural choice: hold individual bonds directly or access the bond market through a fund or separately managed account.

A bond ladder is a portfolio of individual bonds with staggered maturities — for example, bonds maturing each year over a ten-year horizon. As each rung matures, the principal is either spent or reinvested at the next available rate. Ladders offer predictability, no management fees, and the certainty of receiving par at maturity (assuming no default). The tradeoff is that building a well-diversified ladder of individual corporate bonds requires substantial capital, and trading costs on individual bonds can be meaningful.

Bond funds — including mutual funds, exchange-traded funds, and separately managed accounts — offer diversification at lower minimums and professional management but have no maturity date. In a rising-rate environment, a fund's net asset value declines along with its underlying bonds, and an investor who sells at that point realizes the loss. A direct-bond investor who holds to maturity receives par regardless of interim price movements, which is a meaningful psychological and financial difference for families planning around known cash needs.

A variation worth understanding is direct indexing applied to bond portfolios, which can allow systematic tax-loss harvesting across hundreds of individual positions — a potential advantage for high-bracket taxable investors that funds generally cannot replicate with the same precision.

Questions to Ask and Mistakes to Avoid

When evaluating a fixed-income approach, families and their advisers sometimes find it useful to explore:

• What is the after-tax yield on each bond type, given this family's specific tax rates and state of residence?
• How does the proposed duration interact with the family's expected spending needs and liability timeline?
• Is concentration in a single issuer, sector, or state meaningful enough to warrant concern?
• Are management fees, transaction costs, and bid-ask spreads being accounted for in yield comparisons?
• How is the fixed-income allocation coordinated with tax-deferred and tax-exempt accounts? (The question of which bonds belong in which account type is covered under asset location.)

A common mistake is focusing on stated yield rather than total return, which includes price changes, reinvested coupons, and tax consequences. Another is treating all bond funds as equivalent regardless of their duration or credit profile — a short-term government fund and a long-duration high-yield fund are profoundly different instruments that happen to share a category name. A qualified investment adviser and CPA should be consulted before making any specific fixed-income decisions.