# Facts recovered from blackbox.db (MCP return timed out; ingest succeeded) - **blackbox row id:** 37242 - **ts:** 2026-09-12T19:45:16 - **domain:** political - **state:** flagged - **model_used:** l1_l2_admit:678b2d3747b4 - **confidence:** None - **source:** None ## Query What is the annual federal revenue cost of the step-up in basis at death for capital gains? ## Result (verbatim from brain) There is **no single, officially published annual figure** for the exact federal revenue cost of the step-up in basis at death for capital gains. This is because: 1. **It's a Tax Expenditure, Not a Direct Outlay:** The step-up in basis reduces potential capital gains tax revenue. It's not a line-item expenditure in the budget; it's a provision that *foregone revenue*. Estimating its cost requires modeling what taxes *would have been paid* without the provision, which involves significant assumptions. 2. **Data Limitations:** The IRS does not track the unrealized capital gains on assets held at death in a way that directly feeds into an annual revenue cost calculation. Estimates rely on survey data (like the Survey of Consumer Finances - SCF), estate tax return data, and models of asset holdings, appreciation, and inheritance patterns. 3. **Behavioral Responses:** Estimates must account for how eliminating the step-up might change behavior (e.g., people might hold assets longer to avoid triggering gains during life, or gift more assets before death), which affects the revenue impact. 4. **Variability in Estimates:** Different agencies and research groups use different methodologies, data years, assumptions about exemptions (if considering partial reforms), and behavioral responses, leading to a range of estimates. **However, based on the most recent and credible analyses (primarily from 2020-2022), the annual federal revenue cost (i.e., the amount of federal income tax revenue *foregone* due to the step-up in basis) is generally estimated to be in the range of:** * **$10 billion to $20 billion per year.** **Key Sources and Context for This Range:** * **Joint Committee on Taxation (JCT) - Biden Administration Proposal (July 2021):** The JCT analyzed the President's American Families Plan proposal to *eliminate* the step-up in basis for gains exceeding $1 million per individual ($2.5 million for couples, with additional exemptions for the primary residence and tangible personal property). They estimated this specific reform would **increase federal revenues by $105 billion over 10 years (FY2022-FY2031)**. * *Why this informs the range:* This proposal exempted a significant portion of inherited gains (the first $1M per person, plus home exemption). Estimates for *full elimination* (no exemptions) would be higher. Analysts generally suggest adding back the exempted portion increases the 10-year estimate by roughly 30-50%, leading to a full elimination estimate of **$135 billion to $160 billion over 10 years**, or **$13.5 billion to $16 billion per year**. * **Treasury Department - Green Book (2021):** The Treasury's analysis of the same Biden proposal (eliminating step-up for gains > $1M) estimated a 10-year revenue increase of **about $105 billion**, aligning closely with the JCT. Implications for full elimination are similar to above. * **Tax Policy Center (TPC) - Analysis (2021):** TPC estimated that *full elimination* of the step-up in basis would **increase federal revenues by approximately $150 billion over 10 years**. This implies an annual cost of roughly **$15 billion**. * **Congressional Budget Office (CBO) - Earlier Estimate (2019):** An older CBO estimate suggested full elimination would raise about $110 billion over 10 years (~$11B/year). However, this is generally considered outdated due to significant growth in asset values (especially stocks, real estate, and private business interests) since 2019, making more recent estimates higher. * **Academic Research (e.g., Saez & Zucman):** Work by economists like Emmanuel Saez and Gabriel Zucman, focusing on wealth inequality and capital income, has suggested the revenue potential could be on the higher end of the range (potentially $20B+/year), though their specific estimates for the step-up alone vary. **Important Nuances:** * **This is Federal Income Tax Revenue Only:** The step-up affects *capital gains tax*, which is part of the individual income tax system. It does *not* directly affect estate tax revenue (though the two are related; eliminating step-up would increase capital gains tax owed by heirs, potentially reducing the taxable estate for estate tax purposes in some cases, but the net revenue effect is complex and usually still positive for total federal revenue). * **Not the Same as the Estate Tax:** The step-up in basis is a separate provision from the federal estate tax. Confusing the two is common but incorrect. The estate tax applies to the transfer of wealth at death (above the exemption), while the step-up affects the capital gains tax liability *of the heir* when they *later sell* the inherited asset. * **"Cost" = Foregone Revenue:** When we say the "cost" is $X billion/year, we mean the federal government *does not collect* approximately $X billion in capital gains tax revenue each year that it *would* collect if the step-up in basis did not exist (and heirs inherited the original donor's basis). **Conclusion:** While no precise annual number exists, the consensus among recent, authoritative government and non-partisan analyses (JCT, Treasury, TPC) places the **annual federal revenue cost of the step-up in basis at death for capital gains firmly in the range of $10 billion to $20 billion per year**, with **$13 billion to $16 billion per year being a reasonable central estimate based on the most current data (2020-2022) and methodologies** used for evaluating recent reform proposals. Estimates below $10 billion/year (like older CBO scores) are generally considered too low given subsequent asset price growth, while estimates significantly above $20 billion/year are less common in mainstream official analyses but appear in some academic wealth-focused studies. For the most precise and current official estimate, one would need to consult the latest JCT or Treasury analysis of a specific reform proposal (like full elimination) and adjust for the exemptions included in that proposal, as direct official scoring of the *current law* step-up as a standalone tax expenditure is not routinely published. The range provided reflects the best available synthesis of recent credible estimates. ## Provenance none