Costly Tax Mistakes Retirees Make (and How to Avoid Them)

For many retirees, taxes are one of the most overlooked, yet most impactful, parts of a retirement plan. Small errors may compound over time. This post covers a few common tax pitfalls and how thoughtful planning may help retirees keep more of what they’ve earned.

Why taxes matter in retirement

Taxes reduce the income available for living expenses and may affect Medicare premiums, Social Security taxation, and the Net Investment Income Tax (NIIT). Being deliberate about where assets are held and how gains or losses are realized may improve after-tax outcomes depending on individual circumstances.

Mistake 1: Putting tax-inefficient assets in taxable (brokerage) accounts

Putting assets that generate ordinary interest in a taxable brokerage account may result in higher taxable income and impact after-tax returns.

• Corporate and many government bond interest is taxed as ordinary income (higher rates compared to long-term capital gains rates) maybe a poor fit for taxable accounts.
• By contrast, qualified dividends and long-term capital gains often get preferential long-term capital gains rates (0%, 15%, or 20%), which are usually lower than ordinary income tax rates.

Table: Typical tax treatment by asset type

Asset	Typical Tax Treatment in a Taxable Account
Corporate bond interest	Ordinary income tax rates
Treasury interest	Ordinary income tax rates (federal taxable; state may differ)
Unqualified dividends	Ordinary income tax rates
Qualified dividends	Long-term capital gains rates
Long-term capital gains	Long-term capital gains rates

Practical Ways Investors May Improve Tax Efficiency:

• Some investors choose to hold tax-inefficient fixed income in tax-advantaged accounts, depending on their goals and tax profile.
• Tax-efficient holdings, including broadly diversified equity index funds or tax-managed funds, are often placed in taxable accounts because long-term capital gains and qualified dividends may receive favorable tax treatment.
• Rebalancing may be approached with tax awareness, such as realizing gains in lower-income years or using tax-loss harvesting when applicable.

Mistake 2: Putting municipal bonds in retirement accounts

Many municipal bonds generate interest that is exempt from federal income tax, one of their core benefits. Placing these tax-exempt assets inside tax-deferred accounts may negate that benefit.

Why this is costly:

• Withdrawals from most tax-deferred accounts are generally taxed as ordinary income, which may include interest that would have otherwise been tax-exempt.

Practical considerations:

• Some investors prefer to hold federally tax-exempt municipal bonds in taxable accounts to maintain their tax-exempt characteristics, depending on their individual situation.
• Reviewing tax-equivalent yield calculations can help investors compare municipal and taxable bond yields when evaluating potential account placement.

California note: In California, interest from California-issued municipal bonds is typically exempt from both federal and CA state income tax. Interest from out-of-state municipal bonds is generally exempt from federal tax but may be subject to California state income tax. This distinction can materially affect the after-tax yield comparison for California residents and is worth factoring into any account-placement analysis.

Example: tax-equivalent yield for muni vs corporate bond

If a municipal bond yields 3.5% tax-free, and an investor’s federal marginal tax rate is 24%, the tax-equivalent yield = 3.5% / (1 - 0.24) = 4.61%. This hypothetical example is for illustration only and actual results depend on an investor’s tax profile and specific investments.

Mistake 3: Not understanding tax-loss harvesting properly

Tax-loss harvesting may be a useful strategy, but misunderstandings (or ignoring rules) may reduce its benefits.

How it works (brief):

• Sell an investment at a loss to realize a capital loss.
• Realized capital losses offset realized capital gains. Excess losses offset up to $3,000 of ordinary income per year under current law, with the remainder carrying forward.
• Be mindful of the wash-sale rule (disallows a loss if a “substantially identical” security is purchased within 30 days before or after the sale).

Common traps and tips:

• Replacing a sold position with a nearly identical ETF or fund that triggers a wash sale can invalidate the loss; a suitable replacement (different fund with similar exposure) or a 31+ day wait may preserve the deduction.

Tax-loss harvesting should be considered alongside an investor’s overall asset allocation and risk tolerance.

Quick action checklist for retirees

• Inventory: list current holdings by account type (taxable vs tax-deferred vs Roth).
• Map: classify each holding as tax-efficient (equities, qualified dividends), tax-inefficient (ordinary interest), or tax-exempt (municipal bonds).
• Reposition: review whether certain assets may be more tax-efficient in different account types based on the investor's broader financial plan.
• Harvest: review opportunities for tax-loss harvesting while respecting wash-sale rules.
• Coordinate: consider timing of Roth conversions and distributions as part of overall tax planning.

Related Reading

• What Tax-Efficient Asset Location Does Over a Lifetime A hypothetical case study showing how placing the same investments in different account types can compound to $2.1 million more — without changing what is owned or how much is saved. Read →
• The Bond That Pays Less but Keeps More A 60-year comparison of corporate vs. California municipal bonds, and why the highest-yielding bond is not always the best choice in a taxable account. Read →
• Tax-Loss Harvesting Over a Lifetime A hypothetical analysis of what consistently applying tax-loss harvesting could add over a lifetime — and why the effect compounds the way it does. Read →

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This post is for general educational purposes only and does not constitute tax or investment advice. Individual tax situations vary; consult a qualified tax professional or financial advisor before making planning decisions.