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Chapter 10: Bond Funds and ETFs

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Chapter 10: Bond Funds and ETFs

For most investors, owning individual bonds directly is impractical. Bond markets are decentralized and illiquid; spreads are wide; minimum trade sizes are large. A bond mutual fund or exchange-traded fund (ETF) solves these problems by pooling investor capital, holding thousands of bonds, and offering shares that trade easily.

This chapter explores how bond funds work, compares the major types (mutual funds vs. ETFs), and introduces the specific funds that dominate U.S. bond investing: aggregate bond funds (BND, AGG), Treasury funds (GOVT, VGIT, TLT), corporate bond funds (LQD, HYG), TIPS funds (SCHP, VTIP, TIP), municipal bond funds (MUB, VTEB), international bond funds (BNDX, IAGG), and emerging market bond funds (EMB, VWOB).

Why funds, not individual bonds?​

Individual bond ownership appeals to purists who want to "know what they own" and avoid fees. But individual ownership has severe drawbacks. A typical corporate bond trades in the OTC market with bid-ask spreads of 0.25-0.5%, costing hundreds of dollars on a $10,000 purchase. Many bonds require $25,000-$100,000 minimums. A portfolio of individual bonds requires constant monitoring for credit deterioration, maturity management, and reinvestment of coupons.

A bond fund holds hundreds or thousands of bonds and spreads costs across many shareholders. An investor can buy as little as $1 worth of a fund (one cent per share). The fund manager handles buying, selling, rebalancing, coupon reinvestment, and credit monitoring. The annual expense ratio (typically 0.03-0.60% depending on fund type) is the all-in cost; no hidden trading spreads.

For a $100,000 investment in corporate bonds, paying 0.20% annually ($200) versus trading 0.5% spreads ($500) on purchases and subsequent trading saves money almost immediately.

Fund structures: mutual funds vs. ETFs​

Bond mutual funds price once daily at NAV (net asset value). An investor submitting a redemption order learns tomorrow's exit price but not today's. The fund must honor redemptions by selling bonds if necessary, which can trigger "redemption-driven capital gains" in a taxable account.

Bond ETFs trade continuously on exchanges at market prices. An investor can see the exact exit price in real-time and sell during intraday moves. ETFs use creation/redemption mechanisms with authorized participants to keep their prices close to NAV, and they rarely force capital gains distributions on remaining shareholders (because shares are redeemed at the AP level, not the fund level).

For a buy-and-hold investor in a tax-deferred account, the difference is negligible. For an active trader or a taxable account holder planning to hold for decades, ETFs have a structural advantage.

What's in this chapter​

How to read it​

Start with "Bond Fund Mechanics" if you're unfamiliar with how mutual fund pricing and daily NAV work. If you already understand mutual funds, "Bond ETF Mechanics" explains the intraday trading alternative.

"Mutual Fund vs ETF for Bonds" compares the two structures and helps you decide which fits your situation.

From there, the chapter dives into specific fund categories. "Aggregate Bond Funds" (BND, AGG) is the natural first holding—a single fund that gives you broad bond market exposure. If you want to customize your exposure, explore "Treasury Funds" (GOVT, VGIT, TLT) for pure government debt, "Corporate Bond Funds" (LQD, HYG) for extra yield via credit risk, or "TIPS Funds" (SCHP, VTIP, TIP) for inflation protection.

Specialized investors might consider "Municipal Bond Funds" (MUB, VTEB) for tax-free income, "International Bond Funds" (BNDX, IAGG) for geographic diversification, or "Emerging Market Bond Funds" (EMB, VWOB) for higher yields.

Finally, "Short vs Intermediate vs Long-Term" explains how bond duration (interest rate sensitivity) varies by maturity and how to allocate across duration buckets based on your time horizon and interest rate expectations.

A simple bond allocation for most investors: 70-80% aggregate or Treasury funds (core), 15-25% international developed bonds (diversification), 5% cash. Add TIPSfor inflation protection, corporate bonds for yield, or munis for tax savings based on your specific situation.

Most of the funds discussed have expense ratios under 0.10%, making them extraordinarily cheap compared to actively managed funds. Even a difference of 0.05% compounds to thousands of dollars over decades. All specific tickers mentioned (BND, AGG, TLT, IEF, LQD, HYG, TIPS) are illustrative; similar funds exist across providers (Vanguard, iShares, Schwab, SPDR). Choose based on convenience (what your broker offers), expense ratio, and fund size (larger funds are more liquid).

No funds are perfect; all have tax drag, expense ratios, and tracking error. The goal is to match your needs—yield, safety, inflation protection, tax efficiency—at the lowest possible cost. This chapter equips you to do that.