[TX-01] The 0% Capital Gains Bracket

Harvesting gains, not just losses — and why this is the one threshold in retirement planning that isn’t a cliff

Pillar: Tax Optimization & Decumulation · Applies to: Anyone holding appreciated taxable investments with at least one low-income year ahead Last verified: August 2026 · Refresh cadence: Annual (figures via FN-02) Related: FN-02 Key Numbers · TX-03 Withdrawal-Order Sequencing · TX-02 Roth Conversion Strategy · ER-02 Roth Ladder · HC-01 ACA Bridge · HC-06 IRMAA · HC-03 Medicaid Floor · EX-02 U.S. Taxes Abroad

Not advice. Educational reference. Gain harvesting is irreversible in the year you do it, and its federal cost of zero can sit alongside a five-figure cost in health subsidies or Medicare surcharges. Model the whole return — not just the capital-gains line — before selling anything.

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TL;DR

• For 2026 the long-term capital gains rate is 0% while taxable income stays at or below $49,450 single / $98,900 MFJ. ✅ The bracket sits on top of your standard deduction, so an MFJ couple with no other income can realize $131,100 of gains and owe nothing federal.
• Loss harvesting is famous; gain harvesting is the mirror image and almost nobody does it. There is no wash-sale rule on gains — you may sell an appreciated position and rebuy it the same minute, permanently resetting your basis upward at a 0% cost. ✅
• One mechanic governs everything: ordinary income fills the brackets first, and long-term gains stack on top. So every dollar of Roth conversion or IRA withdrawal displaces a dollar of 0% gain. Conversions and harvesting compete for the same space — one strategy owns each year (ER-02 §4).
• The misconception this article exists to kill: the 0% bracket is not a cliff. Cross the line and only the dollars above it are taxed at 15%. After a wiki full of genuine cliffs — the 400% FPL line, every IRMAA tier — this is the one threshold you can approach without a buffer.
• But 0% federal is not free. The bracket is a taxable income test while the ACA and IRMAA run on MAGI, which has no deduction and no bracket. A harvest that costs $0 in tax can cost $20,000 in premium credits (HC-01) or an IRMAA tier two years later (HC-06).
• Never harvest what death will erase. The basis step-up makes late-life harvesting a pure donation to the Treasury (TX-03 §5).

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1. The Stacking Mechanic

Everything in this article follows from one rule most people get backwards.

Your income is sorted into two piles. Ordinary income — wages, interest, pensions, IRA and 401(k) withdrawals, Roth conversions, net rental income, short-term gains — fills the brackets from the bottom. Preferential income — long-term capital gains and qualified dividends — is then stacked on top of it, and taxed on its own rate schedule according to where it lands.

The consequence people miss: preferential income doesn’t get its own separate allowance. It gets whatever room the ordinary income left behind.

Layer	What it is	Rate
Deduction	Standard deduction absorbs income from the bottom	0%
Ordinary income	Wages, interest, IRA withdrawals, Roth conversions	10% / 12% / 22% …
Preferential income, stacked above	LTCG + qualified dividends	0% while total taxable income ≤ the line
Preferential income above the line	The excess only	15%, then 20%

The arithmetic that falls out of it is beautifully simple:

Harvest capacity = (0% bracket top + your deduction) − (all your other income)

Every dollar of other income displaces exactly one dollar of harvest capacity. That single equation is the whole strategy.

Qualified dividends are not optional and they consume the space first. A $2M taxable portfolio throwing off 1.8% in qualified dividends generates ~$36,000 of preferential income you did not choose, sitting in the bracket before you harvest a share. Fund distributions in December do the same thing (TX-03).

2. The 2026 Numbers

Straight from Rev. Proc. 2025-32 §3.03 — the maximum zero-rate and maximum 15% amounts, by taxable income: ✅

Filing status	0% up to	15% up to	20% above
Married filing jointly / surviving spouse	$98,900	$613,700	—
Head of household	$66,200	$579,600	—
Single	$49,450	$545,500	—
Married filing separately	$49,450	$306,850	—
Estates and trusts	$3,300	$16,250	—

Add the standard deduction to get gross capacity before any other income:

Filing status	0% line	+ standard deduction	Total income at 0%
MFJ	$98,900	$32,200	$131,100
MFJ, both 65+	$98,900	$32,200 + $3,300	$134,400
MFJ, both 65+, with senior deduction (2025–2028)	$98,900	+ $12,000	$146,400 ◻️
Single	$49,450	$16,100	$65,550
Single, 65+	$49,450	$16,100 + $2,050	$67,600

Two things worth staring at. The estates and trusts line — $3,300 — is why holding appreciated assets inside a non-grantor trust is a different game entirely ([EP-02]). And the senior-deduction row is temporary: the OBBBA $6,000-per-person deduction expires after 2028, so a 65+ couple’s 0% capacity contracts by roughly $12,000 in 2029 (FN-03 §5).

3. Gain Harvesting vs. Loss Harvesting

They are opposites, and the asymmetry in the rules is the entire opportunity.

	Loss harvesting	Gain harvesting
What you sell	Positions below basis	Positions above basis
Immediate tax	Offsets gains, then $3,000/yr of ordinary income	$0, while inside the bracket
Effect on basis	Lowers it — you’re borrowing from the future	Raises it — permanently
Can you rebuy immediately?	No — 30-day wash-sale window (§1091)	Yes — §1091 applies only to losses ✅
What it really does	Defers tax	Eliminates tax on the harvested gain
Best year for it	High-income years	Low-income years

§1091 is written to stop taxpayers claiming a loss while keeping the position. It has nothing to say about gains — so a gain harvest costs you no time out of the market and no tracking-error risk. Sell and rebuy in the same session.

The value is a permanent conversion: a dollar of embedded gain that would have been taxed at 15% later is taxed at 0% now, and never again. You are not deferring anything. You are deleting it.

4. What It’s Worth: A Worked Example

Couple, both 60, retired, MFJ, no-income-tax state (state layer in the State notes). Their taxable account holds $600,000 with $260,000 of embedded long-term gain. Income this year: $10,000 of interest and a small IRA withdrawal, plus $14,000 of qualified dividends.

Step 1 — find the capacity.

Capacity = ($98,900 + $32,200) − $24,000 of other income = $107,100

Step 2 — verify it. They sell lots carrying exactly $107,100 of long-term gain and rebuy the same funds that afternoon.

	Amount
Ordinary income	$10,000
Qualified dividends	$14,000
Harvested long-term gain	$107,100
Total income	$131,100
Less standard deduction	($32,200)
Taxable income	$98,900 — exactly at the line
Federal tax on $121,100 of preferential income	$0 ✅

Step 3 — price what they bought. Their basis rose by $107,100. Had those same shares been sold in a later 15% year:

$107,100 × 15% = $16,065 of tax permanently avoided

And they still hold every share. No market exposure was given up, no position changed, no 30-day window observed. Run for four bridge years against a portfolio with enough embedded gain and the figure clears $60,000 — from an afternoon of trades each December.

Note what the last dollar does. If a late fund distribution pushes them $4,000 over the line, they owe 15% on $4,000 — $600. Not on the whole $107,100. This is a slope, and it is the reason gain harvesting tolerates imprecision that the ACA cliff and IRMAA tiers do not.

5. The Competition: Conversions vs. Harvesting

Because ordinary income sits underneath the gains, a Roth conversion does two things at once: it is taxed itself, and it shoves gains up out of the 0% zone.

Inside the overlap, the true marginal cost of a conversion dollar is the sum of both:

You are in the…	Conversion taxed at	Gain displaced from 0% to 15%	Real marginal cost
12% bracket	12%	15%	27%
22% bracket	22%	15%	37%

A “12% bracket” Roth conversion done on top of harvestable gains is really a 27% conversion. That is worse than the 22–24% bracket most conversion plans are trying to avoid — and it is invisible on the conversion line of the return, because the cost shows up in the capital-gains line instead.

So one strategy owns each year. Pick deliberately:

Choose conversions when	Choose harvesting when
The traditional balance is large enough that RMDs will force 22%+ later (TX-02)	Taxable holdings carry large embedded gains you’ll spend before death
You need the 5-year ladder rungs (ER-02)	You’re rebalancing anyway and would realize gains regardless
Heirs are high earners who’d inherit traditional at peak rates	Heirs will get a step-up on what’s left, but you’ll sell before then
You’re pre-63 and IRMAA hasn’t started counting	You want to raise basis before moving abroad (EX-02 §5)

Alternating years — a fat conversion year, then a fat harvest year — usually beats splitting both every year, for the same reason HC-01 recommends lane-picking: the losses at the boundaries are step functions.

6. Why 0% Federal Isn’t Free

The bracket is a taxable income test. Nearly every other threshold that matters to a retiree is a MAGI test — and MAGI is computed before the standard deduction and knows nothing about stacking. The same harvest is simultaneously invisible to your tax bill and enormous to your benefits.

• ACA premium credits (HC-01). The full gain is ACA MAGI. Our couple’s $107,100 harvest takes MAGI to $131,100 — far past the $84,600 400%-FPL cliff for a household of two, destroying every dollar of credit, with the repayment caps now gone. Gain harvesting at scale and ACA subsidies are close to mutually exclusive before 65. A pre-65 retiree on the exchange harvests in small doses sized against the FPL lines, or not at all.
• The Medicaid floor, in reverse (HC-03 §7). The same mechanic run the other way makes a small harvest the cheapest way to manufacture MAGI and climb off the floor — 0% federal tax and it lifts you into subsidy territory.
• IRMAA (HC-06). Gains land in AGI and therefore in IRMAA MAGI, two years forward. A $107,100 harvest at 63 prices your age-65 Medicare premiums. Unlike the capital-gains bracket, IRMAA is a genuine cliff — one dollar buys the whole tier.
• NIIT. 3.8% above $200,000 single / $250,000 MFJ of MAGI, not indexed — so it never collides with 0% harvesting (you’d be far below), but it stacks on 15%/20% harvesting and is why a large one-off realization is really taxed at 18.8% (HC-06 §7, scenario C).
• The senior deduction phase-out (2025–2028). Above $75,000 single / $150,000 MFJ of MAGI the $6,000-per-person deduction phases out, an effective ~6% surtax band that a large harvest can walk straight into (FN-02).

7. When Not to Harvest

• When the step-up will erase it anyway. Assets held until death get a basis step-up; harvesting in your late 70s and 80s pays tax on gains that were about to be forgiven. TX-03 §5 is explicit: hold winners to death. Harvest in the bridge years, not the legacy years.
• In a community-property state, after the first spouse’s death is imminent. WA, CA, TX, AZ, ID, LA, NM, NV, WI give both halves a step-up at the first death — the most valuable basis event most couples never plan around.
• When you’ll donate the shares. Giving appreciated stock to charity or a donor-advised fund means the gain is never taxed and you may deduct fair market value. Harvesting first destroys half that benefit.
• When you need the ACA subsidy more (§6).
• When your state doesn’t play along. Most states with an income tax have no preferential rate for capital gains — they tax the harvest as ordinary income while the federal cost is zero (State notes).

8. Execution Mechanics

• Use specific identification. Choose the exact lots at the time of sale, in the broker’s interface, before the trade settles. Defaults are typically FIFO — which sells your oldest, lowest-basis shares and blows through the capacity fastest.
• Mutual-fund average cost is sticky. Once elected for a fund position, changing methods is restricted going forward. Check before you need it.
• Rebuying restarts the holding period. The replacement lot is short-term for twelve months. Irrelevant if you hold; expensive if you must sell in the interim, since short-term gains are ordinary income and get no preferential treatment at all.
• Harvest in December, after mutual-fund capital-gain distributions post and the year’s income is known — the same discipline as conversion sizing (ER-02 §5).
• You generally owe no estimated payment on a 0% harvest, because there’s no tax. This is one of the few year-end moves with no April consequence — but recompute if any part spills into 15%.
• Trade date governs, not settlement date. A December 31 trade is a this-year trade.
• Track it. Log the lots, the gain realized, the resulting basis. Next year’s capacity calculation starts from the new basis.

9. Three Scenarios

A. The pre-65 couple who mostly can’t (both 58, on a subsidized Silver plan, MAGI target 245% FPL). Their theoretical harvest capacity is ~$100,000. Their actual capacity is whatever fits under their FPL target — a few thousand dollars, after dividends. They harvest $3,000, bank the tiny basis bump, and note that the real harvest years start at 65 when the ACA constraint lifts. The 0% bracket is largely unavailable to subsidized early retirees, and pretending otherwise is the most common error in FIRE tax content.

B. The golden-window couple choosing (both 66, on Medicare, pre-RMD, $1.6M traditional, $700k taxable with $300k embedded gain). They have one pot of low-bracket space and two claims on it. Their traditional balance projects RMDs into the 24% bracket at 73 with a survivor cliff behind it, so conversions win the standing argument (TX-02). But they alternate: conversion years to the top of the 22% bracket, and every third year a harvest year with minimal ordinary income, resetting basis on the taxable account. Both threats get worked, neither at 27%.

C. The 81-year-old who shouldn’t (widower, $900k taxable, $500k embedded gain, modest spending). His advisor suggests harvesting to “use the 0% bracket.” It is the wrong advice: his heirs will receive a full step-up, so the $500,000 of gain is already scheduled to be forgiven in full. Harvesting realizes gains that would cost nothing at all, and adds MAGI that can raise his IRMAA tier. He harvests nothing. The 0% bracket is a tool for people who will spend the money themselves.

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💡 Pro-Tips

1. Compute capacity from the equation, not the table: (0% top + deduction) − all other income. Every dollar of interest, pension, or conversion displaces a dollar of harvest.
2. Remember there is no wash sale on gains. Sell and rebuy the same security the same day — the strategy costs you zero time out of the market.
3. Set specific-ID as your account default now, before you need it. FIFO defaults silently sell your lowest-basis shares.
4. Approach the line without a buffer — it’s a slope, not a cliff. Overshooting by $4,000 costs $600, not a subsidy.
5. Then buffer anyway for the MAGI thresholds, which are cliffs. The federal-tax risk is negligible; the ACA and IRMAA risk is not.
6. Harvest the highest-basis lots to raise basis cheaply, the lowest-basis lots to clear the most embedded gain. Which you want depends on whether you’re maximizing gain eliminated or minimizing shares touched.
7. Rebalance inside the harvest. If you’re realizing gains anyway, rebuy the target allocation rather than the position you sold — you get a free rebalance at 0%.
8. Stop harvesting when the legacy phase starts. Roughly: once your horizon is shorter than your spending needs, the step-up beats the bracket (TX-03 §5).

⚠️ Common Pitfalls

1. Thinking the 0% bracket is a separate allowance for gains. It is the room your ordinary income didn’t use.
2. Doing a Roth conversion and a gain harvest in the same year and paying a hidden 27% on the conversion.
3. Forgetting qualified dividends and fund distributions already occupy the bracket before you sell anything.
4. Harvesting while on a subsidized ACA plan and vaporizing the premium credit to save nothing.
5. Treating the 0% line like a cliff and leaving thousands of dollars of free capacity unused out of caution.
6. Letting the broker pick the lots — FIFO defaults sell exactly the wrong shares.
7. Harvesting at 80 what the basis step-up would have erased entirely.
8. Selling a harvested-and-rebought lot within twelve months and paying ordinary rates on a short-term gain.
9. Ignoring state tax — most income-tax states have no preferential capital-gains rate, so “0%” is federal only.
10. Harvesting shares you intended to donate, throwing away the never-taxed-gain benefit of giving appreciated stock.

✅ Actionable Checklist

Once (setup)

• Set cost-basis method to specific identification on every taxable account
• Inventory lots: shares, basis, acquisition date, embedded gain per lot
• Decide your phase: bridge/spend-it-yourself (harvest) vs. legacy (hold for step-up)
• Check whether your state gives capital gains any preferential treatment

Every October

• Project year-end ordinary income and qualified dividends
• Pull estimated fund capital-gain distributions
• Decide the year’s owner: conversion year or harvest year (ER-02 §4)

Every December

• Compute capacity: (0% top + deduction) − other income, from FN-02
• Check the binding MAGI constraint first — FPL line (HC-01) or IRMAA tier (HC-06) — and take the lower of it and the tax capacity
• Sell chosen lots by specific ID; rebuy immediately (or rebuy the rebalanced target)
• Log lots, gain realized, and new basis for next year’s calculation

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State notes (→ ST-01, ST-04): The 0% bracket is purely federal, and most states do not have one. The large majority of income-tax states tax long-term capital gains as ordinary income at full rates — so a harvest that costs $0 federally can cost 5–9%+ at the state line, which can invert the entire decision. A handful of states offer partial exclusions or lower rates for gains ◻️ (current treatment in ST-04). The strategy is therefore worth the most in the no-income-tax states (WA, FL, TX, NV, TN, SD, WY, AK, NH), where 0% federal really means 0% total — with one large exception: Washington levies a 7% capital-gains excise tax on long-term gains above roughly $278k (9.9% above $1M), real estate exempt ◻️, which caps how large a single-year WA harvest should be even though WA taxes no other income (FN-02). Two sequencing consequences follow. If a move is planned, harvest on the low-tax side of it — the same trade can cost thousands more depending on which side of the moving truck it lands (ST-03). And if you are leaving the country, harvest before establishing foreign tax residency: many destinations tax gains from your original basis with no step-up on arrival (EX-02 §5).

Sources & further reading (verified Aug 2026)

• Rev. Proc. 2025-32 §3.03 — 2026 maximum zero-rate and maximum 15% amounts for all filing statuses (MFJ $98,900/$613,700 · HoH $66,200/$579,600 · Single $49,450/$545,500 · MFS $49,450/$306,850 · Estates & trusts $3,300/$16,250)
• IRC §1(h) (preferential rate structure and the stacking rule); §1091 (wash sales — losses only); §1411 (NIIT); §1014 (basis step-up at death)
• IRS Pub. 550, Investment Income and Expenses (lot identification, holding periods); Pub. 551 (basis); Form 8949 and Schedule D instructions
• OBBBA (P.L. 119-21) — senior deduction and its post-2028 expiry; tracked in FN-03 §5
• FN-02 Key Numbers 2026 for all thresholds; ER-02 §4 Layer 3 for the conversion-vs-harvest collision; TX-03 §5 for the step-up argument against late-life harvesting