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The Money Desk · Blog
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How to Build a Diversified Portfolio When Bond Yields Are Volatile

A practical guide to setting a personal portfolio mix, diversifying bond holdings and rebalancing when yields move.
From TheFinanceBase Team5 min to read
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When bond yields are volatile, build around a target allocation that fits your time horizon and ability to tolerate losses—not around a guess about where rates are headed. Diversify across asset classes and, within the bond portion, consider maturity, issuer and investment structure. Then use a planned rebalancing process to keep the portfolio near its target.

Start with a target allocation—not a rate forecast

Asset allocation is the division of a portfolio among categories such as stocks, bonds and cash. The right mix is personal: the SEC says it depends on your investment time horizon and risk tolerance. A longer horizon may give an investor more time to ride out market declines; a shorter horizon or lower tolerance for losses may call for a different balance. Neither factor produces one universally suitable stock-and-bond split.

Choose a mix you can reasonably maintain through both rising and falling markets. If you are unsure how much volatility you can accept, consider how a significant decline would affect your plans and whether you could stay invested rather than sell in response. The SEC’s asset-allocation guidance describes the decision as personal, rather than prescribing a single allocation.

An SEC municipal-bond bulletin uses 50% stocks, 40% bonds and 10% cash as an example of an allocation. It is illustrative, not a recommendation for every investor or a special solution for volatile yields. Your goals and circumstances should determine your own target.

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Understand what changing yields do to bonds

Why fixed-rate bond prices can move

A fixed coupon does not make a bond’s market price fixed. When newly issued bonds offer higher rates, an existing fixed-rate bond with a lower coupon may be less attractive, so its market price generally falls. When market rates fall, the price of an existing fixed-rate bond generally rises. This is the usual inverse relationship, though rates are not the only factor affecting a bond’s price.

The SEC’s 2013 example illustrates the mechanics with a hypothetical 10-year Treasury: when the market rate and coupon are both 3%, the bond is shown at $1,000. After one year, if the market rate rises to 4%, the example shows the bond—with nine years remaining—at $925, with a 4% yield to maturity. These are explanatory figures from the SEC bulletin, not current quotes or a prediction.

Maturity affects interest-rate sensitivity

Other characteristics being similar, longer-maturity bonds generally have greater interest-rate risk than shorter-maturity bonds. That means a rise in rates can have a larger effect on the market price of a longer bond. Lower coupons can also mean greater sensitivity when other characteristics are equal. These are general comparisons, not a way to predict the exact price change of a particular holding.

Treasury and other government bonds are not immune to this market-price movement. Government backing can protect specified payments and principal at maturity, subject to the security’s terms, but it does not guarantee the price you could get if you sell before maturity.

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Diversify both across assets and within bonds

Diversification spreads investments across asset categories and holdings so that the portfolio is not dependent on a single investment or risk. It can reduce concentration risk, but it cannot ensure a profit or prevent losses. Different assets and bond categories may behave differently, but that does not guarantee that one will offset another during a particular market decline.

Compare bond choices on the risks that matter

  • Maturity and rate sensitivity: A range of maturities can avoid concentrating the bond allocation in one part of the maturity spectrum. Shorter maturities generally have less interest-rate sensitivity than otherwise similar longer ones, but do not eliminate risk.
  • Issuer and credit quality: Government, corporate and municipal bonds have different issuer and credit risks. Corporate issuers may fail to make promised payments. High-yield corporate bonds offer higher yields in exchange for greater risk; a higher yield is not a risk-free improvement.
  • Liquidity: Consider how readily a bond can be sold and whether the price available in a sale would meet your needs. Liquidity risk can matter if you need to sell before maturity.
  • Individual bonds versus funds: An individual bond has stated terms, including a maturity date; if payments are made as promised and you hold it to maturity, interim price changes may matter less to your outcome. Default risk remains for non-government issuers. A bond fund spreads exposure across multiple holdings, but its shares do not mature like one individual bond, and the fund retains interest-rate and credit exposure. Review the fund’s documents for its specific holdings, risks, fees and trading costs.

Holding several bonds or bond funds does not erase interest-rate, credit or liquidity risk. Adding a particular category—such as municipal or high-yield bonds—does not guarantee that it will cushion losses elsewhere. Diversify according to the risks you understand and can accept, rather than selecting a bond solely because its yield is higher.

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Use rebalancing to manage drift, not to time rates

When parts of a portfolio perform differently, the actual allocation can drift away from its target. Rebalancing brings it back toward the intended mix and can restore the level of risk you chose. It is a maintenance process, not a prediction about future interest rates.

  1. Set the target allocation. Record the mix that fits your goals, time horizon and risk tolerance.
  2. Choose a review method in advance. You can review on a schedule or check whether an asset class has moved beyond a preset threshold. The SEC notes that some financial experts use regular intervals such as every six or twelve months; that is an approach, not a required schedule.
  3. Decide how to correct drift. You might direct new contributions toward underweight holdings or sell some overweight holdings and buy underweight ones. The appropriate method depends on your accounts and circumstances.
  4. Check the consequences before trading. Sales may have tax consequences, and transactions may involve costs. Consider these effects when deciding whether and how to rebalance.

The SEC’s rebalancing guidance discusses restoring a portfolio’s allocation after it changes through performance, including the possibility of tax or transaction costs. The SEC and FINRA year-end considerations also address reviewing investments and related costs.

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What to do when yields rise—or fall

A change in yields alone does not establish that your target allocation should change. First distinguish a change in bond prices from a change in your goals or circumstances. If your time horizon, need for liquidity or tolerance for risk has changed, reassessing the overall allocation may make sense. If only market prices have moved, use your rebalancing plan rather than reacting automatically to a rate headline.

There is no current yield figure or rate forecast established here, and neither would by itself tell every investor what allocation to use. For details about a specific bond or fund, consult its offering and risk documents; for an individualized allocation, consider a qualified financial professional.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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