Education · Pillar
Tax-aware investing
Published 2026-05-12 · Educational content; not tax advice and not investment advice.
Pre-tax return is the part of investing the financial-services industry talks about most. After-tax return is the part the household actually keeps. The difference between the two — sometimes called the "tax drag" — can be substantial, particularly for high-income households in high-bracket years. This page covers four levers households can pull on the tax dimension: cost basis, harvesting, location, and deferral.
Cost basis
For a security held in a taxable account, the taxable gain on sale is the difference between the sale proceeds and the cost basis. Basis usually equals the purchase price, adjusted for reinvested dividends, capital-gain distributions, and corporate actions. Investments inherited at death generally receive a "step-up" in basis to fair market value at the date of death, which can be a substantial planning consideration for long-appreciated positions.
When multiple lots of the same security have been purchased over time at different prices, the choice of which lot to sell first affects the realized gain. Methods include FIFO (first-in, first-out — the default at many custodians), LIFO, and specific identification. Specific identification — choosing exactly which lot to sell — gives the most control and is usually preferable when supported.
Tax-loss harvesting
In any sufficiently long holding period, some positions in a diversified portfolio will be below their purchase price. Selling those at a loss realizes the loss for tax purposes; the replacement purchase keeps market exposure substantially intact. Harvested losses can offset realized gains; up to $3,000 of net loss per year can offset ordinary income, with the remainder carried forward indefinitely (single-filer figures; current law).
The wash-sale rule (IRC §1091) disallows a loss if a "substantially identical" security is purchased within 30 days before or after the sale. "Substantially identical" has been interpreted narrowly enough to allow swaps between, e.g., different index funds tracking different (but similar) indices, but the line is fact-specific. Wash-sale rules apply across accounts within the same household, including IRAs.
Asset location
A household with assets across taxable, tax-deferred, and tax-free accounts has a choice of which investments to put in which accounts. The general principle is to align tax-inefficient investments (those that produce ordinary-income tax events) with tax-protected accounts, and tax-efficient investments (those that produce mostly long-term capital gains and qualified dividends) with taxable accounts.
| Investment | Typical first-pass location |
|---|---|
| Taxable-bond funds, REITs | Tax-deferred (Traditional IRA / 401(k)) |
| Broad U.S. equity index funds | Taxable (qualified dividends + long-term gains) |
| Highest-expected-return assets | Tax-free (Roth) — protect maximum growth |
| Municipal bonds | Taxable (interest is federally tax-exempt) |
The first-pass logic gets overridden often. Required minimum distribution math, expected withdrawal sequencing, charitable giving plans (qualified charitable distributions from IRAs; appreciated-stock gifts from taxable accounts), and estate-planning considerations all reshape the answer in real households.
Deferral
Deferral pushes a tax obligation forward in time. Two structural benefits: compounding (more dollars in the account in the intervening years) and option value (the chance to pay the tax in a future, lower-bracket year). Two structural costs: required minimum distributions from traditional retirement accounts (currently starting age 73 for most), and the loss of step-up in basis on assets held in tax-deferred accounts at death.
Roth conversion analysis is one of the clearest places the deferral tradeoff shows up. Converting traditional balances to Roth in a low-bracket year (say, between retirement and the start of Social Security and required minimum distributions) can produce substantial after-tax improvements over a multi-decade horizon — or can backfire if the future bracket assumed for the comparison is wrong. The answer is household-specific.
Where Florida residency moves the math
Florida has no state personal income tax. Households domiciled in Florida save the state-income-tax wedge on ordinary investment income, short-term gains, and (in many states) long-term gains. Two practical consequences:
- In-state municipal bonds (e.g., New York Yorkers buying NY-state munis) lose their relative attractiveness for Florida residents; out-of-state munis become essentially equivalent on the state-tax dimension.
- Roth-conversion math gets more favorable for households moving from a high-tax state, because the federal-only tax on the conversion is the only tax owed at conversion time.
Establishing Florida domicile is a separate legal exercise with documentation requirements that vary by prior state. Working with qualified tax and legal advisors on domicile is the standard approach.
An important disclaimer
Nothing on this page is tax advice. Tax law is fact-specific and changes regularly. Households should work with a qualified tax professional on the application of any concept on this page to their specific situation. Tandem Private Wealth LLC does not currently offer investment advisory services. This page is published as educational content only.
Frequently asked questions
What is cost basis and why does it matter?
Cost basis is the amount of money the IRS considers you to have invested in a security for purposes of computing gain or loss when you sell it. The gain is sale proceeds minus cost basis. For securities held in a taxable account, the cost basis determines the size of the taxable gain. Methods for selecting which "lot" of shares to sell first (FIFO, LIFO, specific identification) can produce substantially different tax outcomes, particularly for long-held positions with appreciated lots and recent lots near current price.
What is tax-loss harvesting?
Tax-loss harvesting is the practice of selling a security at a loss in a taxable account to realize the loss for tax purposes, while maintaining roughly the same market exposure by purchasing a not-substantially-identical replacement security. The harvested loss can offset realized gains (and, up to certain limits, ordinary income). The "wash-sale" rule under IRC §1091 disallows the loss if a substantially identical security is purchased within 30 days before or after the sale, so the replacement security selection matters.
What is asset location?
Asset location is the choice of which account type to hold a given investment in across taxable, tax-deferred (Traditional IRA / 401(k)), and tax-free (Roth IRA / Roth 401(k)) accounts. Investments with high ordinary-income generation (taxable bond funds, REITs) often produce a better after-tax outcome in tax-deferred accounts. Investments with high expected long-term capital gains and qualified dividends often produce a better after-tax outcome in taxable accounts where preferential rates apply. The right answer depends on each household's account mix, expected withdrawal patterns, and tax brackets.
How does Florida residence change the tax picture?
Florida has no state personal income tax. For households domiciled in Florida, this materially changes the relative attractiveness of certain investments — for example, taxable bonds versus in-state municipal bonds (where the "in-state" tax exemption has no value because there is no state tax to exempt). It also changes the after-tax math on realized gains and ordinary investment income relative to high-tax-state alternatives. Establishing Florida domicile is a separate legal question with its own requirements; mere residence is not enough.
How does deferral interact with the rest of the framework?
Deferral is the option to push a tax obligation forward in time, typically without changing its eventual amount. The two primary benefits of deferral are compounding (more dollars working for you in the interim) and the option value of paying tax under a future, possibly lower, tax rate. Deferral has costs as well — required minimum distributions from traditional retirement accounts, the loss of step-up in basis on assets held in tax-deferred accounts, and the risk that future rates are higher than current rates. Roth conversions are a common decision point where the tradeoff plays out explicitly.