tax-loss-harvesting

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Tax-Loss Harvesting

税损收割

Purpose

用途

Execute a complete tax-loss harvesting (TLH) workflow from candidate identification through post-harvest monitoring. Provides decision criteria, quantitative thresholds, replacement security selection logic, wash-sale compliance tracking across accounts, and household-level coordination that go beyond the overview in the tax-efficiency skill.

执行从候选标的识别到收割后监控的完整税损收割（TLH）工作流。提供决策标准、量化阈值、替代证券选择逻辑、跨账户虚售规则合规追踪，以及家庭层面的协同方案，其内容深度超出节税技能中的概述范畴。

Layer

层级

5 — Policy and Planning

5 — 政策与规划

Direction

适用方向

both

双向

When to Use

适用场景

Scanning a portfolio for unrealized losses that exceed a materiality threshold
Building a gain/loss budget for the current tax year to determine target harvest amount
Selecting replacement securities that maintain factor exposure without triggering wash-sale rules
Tracking the 61-day wash-sale window across taxable, IRA, and spouse accounts
Generating a TLH trade list coordinated with rebalancing
Calculating the after-tax value of a proposed harvest including state taxes and NIIT
Monitoring replacement positions and planning swap-back timing after the wash-sale window closes
Preparing TLH opportunity summaries for client reviews

扫描投资组合中超过重要性阈值的浮亏
为当前纳税年度制定收益/损失预算，确定目标收割金额
选择既能维持因子敞口又不会触发虚售规则的替代证券
跨应税账户、IRA、配偶账户追踪61天虚售规则窗口期
生成与再平衡协同的TLH交易清单
计算拟执行收割的税后价值，包含州税和NIIT
监控替代持仓，规划虚售窗口期结束后的换回时机
为客户复盘准备TLH机会总结

Core Concepts

核心概念

Candidate Identification

候选标的识别

Scan the portfolio for positions with unrealized losses that meet all three filters:

Materiality threshold: Minimum absolute loss (e.g., $2,000) or minimum loss-to-value ratio (e.g., loss exceeds 5% of position market value). Harvesting a $200 loss on a $50,000 portfolio is not worth the operational cost.
Holding period filter: Positions held less than 31 days may not have meaningful losses and create short-term wash-sale complexity. Positions approaching the one-year mark (days 335-365) may benefit from waiting to convert a short-term loss into a long-term loss only if the position is expected to continue declining.
Loss magnitude ranking: Rank candidates by Tax Benefit = Unrealized Loss * Applicable Tax Rate. Prioritize short-term losses (taxed at ordinary rates up to 37%) over long-term losses (taxed at capital gains rates of 15-20%) when gain/loss budget allows.

扫描投资组合中符合以下三个筛选条件的浮亏持仓：

重要性阈值： 最低绝对损失（例如2000美元）或最低损失占比（例如损失超过持仓市值的5%）。在5万美元的投资组合中收割200美元的损失，其运营成本高于收益。
持有期过滤： 持有不足31天的持仓通常不会产生可观损失，还会带来短期虚售规则的复杂度。接近1年持有期（335-365天）的持仓，如果预计价格会继续下跌，可以等待将短期损失转为长期损失后再收割。
损失规模排序： 按「税收优惠=浮亏金额×适用税率」对候选标的排序。在收益/损失预算允许的情况下，优先收割短期损失（按最高37%的普通收入税率计税），其次是长期损失（按15-20%的资本利得税率计税）。

Gain/Loss Budgeting

收益/损失预算

Before harvesting, build the year-to-date tax budget:

Realized gains YTD: Sum all short-term and long-term capital gains already realized (including fund distributions).
Planned gain exposure: Estimate gains from pending rebalancing trades, planned liquidations, or expected fund capital gain distributions.
Loss carryforward balance: Check prior-year unused capital loss carryforwards (these offset gains before new harvests do).
Target harvest amount: Target Harvest = (Realized Gains YTD + Planned Gains) - Loss Carryforward - $3,000 ordinary income offset. Harvest at least this amount to zero out the current-year tax bill; harvest more to build carryforward for future years.

收割前，先制定当年累计税务预算：

年初至今已实现收益： 汇总所有已实现的短期和长期资本利得（包含基金分红）。
计划收益敞口： 估算待执行的再平衡交易、计划清算、预期基金资本利得分红产生的收益。
亏损结转余额： 查询上一年未使用的资本损失结转额度（这类额度会优先于新收割的损失抵扣收益）。
目标收割金额： 目标收割额 =（年初至今已实现收益 + 计划收益）- 亏损结转额度 - 3000美元普通收入抵扣额。至少收割该金额可抵消当年全部应缴税额；超额收割的部分可结转至未来年度使用。

Replacement Security Selection

替代证券选择

The replacement must maintain market exposure without being "substantially identical":

ETF-to-ETF swaps: Switch between funds tracking different indices (e.g., Vanguard Total Stock Market to Schwab Broad Market, or S&P 500 to Russell 1000). Different index methodology is generally sufficient.
Individual stock replacement: Replace a single stock with a sector ETF or a peer company. Example: sell Apple, buy Technology Select Sector SPDR (XLK).
Tracking error budget: The replacement should have a correlation of 0.95+ and tracking error under 2% annualized relative to the original holding. Wider tracking error is acceptable for larger tax benefits.
Expense ratio delta: Ensure the replacement does not have meaningfully higher expenses. A 10 bps cost increase on a $100K position held for 30 days costs roughly $8 — negligible against a $2,000+ tax benefit.

替代证券必须维持市场敞口，同时不能是「实质相同证券」：

ETF置换ETF： 切换到跟踪不同指数的基金（例如 Vanguard 全市场指数基金换成 Schwab 宽基市场基金，或者标普500指数基金换成罗素1000指数基金）。不同的指数编制规则通常足以满足要求。
个股置换： 用行业ETF或者同赛道公司替代单一个股。示例：卖出苹果，买入科技精选行业SPDR基金（XLK）。
跟踪误差预算： 替代证券与原持仓的相关性需达到0.95以上，年化跟踪误差低于2%。如果税收优惠足够高，可以接受更高的跟踪误差。
费率差异： 确保替代证券的费率不会明显更高。10万美元持仓的费率增加10个基点，持有30天的成本约为8美元，相对于2000美元以上的税收优惠可以忽略不计。

Wash-Sale Compliance

虚售规则合规

The wash-sale rule (IRC Section 1091) disallows a loss if a substantially identical security is acquired within the 61-day window (30 days before + sale date + 30 days after):

Cross-account scope: The rule applies across ALL accounts owned by the taxpayer: taxable brokerage, Traditional IRA, Roth IRA, 401(k), HSA, and spouse's accounts. A purchase in any of these accounts triggers wash-sale disallowance.
IRA wash-sale trap: If a wash sale is triggered by a purchase in an IRA, the disallowed loss is permanently lost — it cannot be added to the IRA cost basis. This is the most dangerous wash-sale scenario.
DRIP suspension: Automatic dividend reinvestment (DRIP) in the sold security or a substantially identical fund must be suspended during the 61-day window. Reinvesting even a small dividend triggers a partial wash sale.
Spouse coordination: Purchases in a spouse's accounts (including retirement accounts) trigger wash-sale rules. Both spouses' automatic investments, 401(k) contributions, and DRIP settings must be reviewed.

虚售规则（美国国税法第1091条）规定，如果在61天窗口期（卖出前30天+卖出当日+卖出后30天）内买入实质相同证券，损失抵扣将被禁止：

跨账户覆盖范围： 该规则适用于纳税人所有的账户：应税经纪账户、传统IRA、Roth IRA、401(k)、HSA以及配偶的账户。上述任意账户发生买入操作都会触发虚售规则，损失抵扣被禁止。
IRA虚售陷阱： 如果IRA账户的买入操作触发了虚售规则，被禁止抵扣的损失将永久失效，无法计入IRA的成本基数。这是风险最高的虚售场景。
暂停DRIP： 在61天窗口期内，必须暂停卖出证券或实质相同基金的自动股息再投资（DRIP）。即使是小额股息再投资也会触发部分虚售规则。
配偶协同： 配偶账户（包括退休账户）的买入操作也会触发虚售规则。必须检查夫妻双方的自动投资、401(k)缴款和DRIP设置。

Execution Planning

执行规划

Translate candidates into an actionable trade list:

Lot selection method: Use Specific Identification (Spec ID) to select the highest-cost-basis lots first (HIFO). This maximizes the realized loss per share sold. If only partial harvesting is needed, sell only the lots with cost basis above current market price.
Coordination with rebalancing: If the portfolio also needs rebalancing, combine TLH sells with rebalance sells to reduce total trade count. A position that is both overweight and at a loss is the ideal candidate — the harvest and rebalance are the same trade.
Timing strategy: Year-end harvesting (October-December) captures the full year's losses but faces market timing risk. Opportunistic harvesting throughout the year during drawdowns of 5%+ captures losses that may recover by year-end.
Trade list fields: Security, account, action (sell/buy), shares, lot IDs, estimated loss, replacement security, wash-sale window start/end dates.

将候选标的转化为可执行的交易清单：

批次选择方法： 使用特定识别法（Spec ID）优先选择成本基数最高的批次（HIFO）。这可以最大化每股卖出的已实现损失。如果只需要部分收割，仅卖出成本基数高于当前市价的批次即可。
与再平衡协同： 如果投资组合同时需要再平衡，可以将TLH卖出和再平衡卖出合并，减少总交易次数。同时符合超配和浮亏条件的持仓是最优标的，收割和再平衡可以通过同一笔交易完成。
时机策略： 年底收割（10-12月）可以覆盖全年的损失，但存在市场择时风险。全年在回撤超过5%时 opportunistic 收割，可以捕获到年底可能回升的损失。
交易清单字段： 证券、账户、操作（买/卖）、股数、批次ID、预估损失、替代证券、虚售窗口期起止日期。

Tax Savings Calculation

节税金额计算

Quantify the dollar value of each proposed harvest:

Federal rate selection: Short-term losses offset short-term gains first (up to 37% ordinary rate). Long-term losses offset long-term gains (15-20% rate). Net losses of either type can cross over to offset the other, then up to $3,000 offsets ordinary income.
State tax impact: Most states tax capital gains as ordinary income (rates 0-13.3%). Include state tax savings in the calculation; for a California resident at the 13.3% bracket, state tax roughly doubles the benefit of each harvest.
NIIT interaction: The 3.8% Net Investment Income Tax (IRC Section 1411) applies to the lesser of net investment income or MAGI exceeding $250,000 (MFJ). Harvested losses reduce net investment income, potentially eliminating NIIT exposure.

量化每笔拟执行收割的实际价值：

联邦税率选择： 短期损失优先抵扣短期收益（最高37%普通税率）。长期损失优先抵扣长期收益（15-20%税率）。两类净损失可以交叉抵扣对方，之后最多3000美元可以抵扣普通收入。
州税影响： 大多数州将资本利得视为普通收入计税（税率0-13.3%）。计算时需要包含州税节减；对于加州13.3%税率档的居民，州税几乎可以让每笔收割的收益翻倍。
NIIT交互： 3.8%的净投资收益税（美国国税法第1411条）适用于净投资收益或调整后总收入超过25万美元（夫妻联合申报）的较低值。收割损失可以减少净投资收益，有可能消除NIIT缴纳义务。

Post-Harvest Monitoring

收割后监控

After executing the harvest:

Wash-sale window tracking: Maintain a calendar of open wash-sale windows with security identifiers and expiration dates. Flag any pending purchases (including automated ones) that would violate the window.
Replacement performance: Monitor tracking error between the replacement and original security. If the replacement significantly underperforms (>3% divergence), evaluate whether the tax benefit justified the swap.
Cost basis updates: Verify that broker statements reflect the new (lower) cost basis on replacement securities. The replacement's basis equals purchase price, not the original security's basis.
Swap-back timing: After the 31st day, the investor may sell the replacement and repurchase the original security if desired. Evaluate whether the swap-back itself triggers a taxable gain on the replacement position.

执行收割后：

虚售窗口期追踪： 维护开放虚售窗口期的日历，包含证券标识和到期日期。标记可能违反窗口期的待执行买入（包括自动买入）。
替代标的表现： 监控替代证券和原证券的跟踪误差。如果替代证券表现明显落后（偏差超过3%），评估税收优惠是否足以支撑置换。
成本基数更新： 确认券商对账单上替代证券的成本基数已更新为更低的新值。替代证券的成本基数等于买入价格，而非原证券的成本基数。
换回时机： 卖出31天后，投资者可以卖出替代证券，回购原证券（如果有需求）。评估换回操作本身是否会触发替代持仓的应税收益。

Household-Level Coordination

家庭层面协同

TLH across a household with multiple accounts requires centralized tracking:

Account type matrix: Taxable accounts are the only accounts where TLH generates direct tax benefits. Retirement accounts have no realized gains/losses for tax purposes, but they can trigger wash sales in taxable accounts.
Advisor-managed vs held-away: If the client has accounts at other institutions (401(k) plan, outside brokerage), the advisor cannot control purchases. Document held-away holdings and instruct the client to avoid purchasing substantially identical securities during open wash-sale windows.
Spousal coordination checklist: (1) Review spouse's 401(k) fund lineup for overlap, (2) suspend DRIP in spouse's accounts for harvested securities, (3) coordinate any year-end tax trades across both spouses.

多账户家庭的TLH需要集中化追踪：

账户类型矩阵： 只有应税账户的TLH可以产生直接税收优惠。退休账户不存在应税的已实现收益/损失，但可能触发应税账户的虚售规则。
顾问管理账户 vs 外部持有账户： 如果客户在其他机构有账户（401(k)计划、外部经纪账户），顾问无法控制买入操作。记录外部持仓，告知客户在开放虚售窗口期内不要买入实质相同证券。
配偶协同检查清单： （1）检查配偶401(k)的基金清单是否存在重叠，（2）暂停配偶账户中已收割证券的DRIP，（3）协同夫妻双方的年底税务交易。

Key Formulas

核心公式

Formula	Expression	Use Case
Tax Benefit	Benefit = Realized_Loss * Applicable_Tax_Rate	Dollar value of a single harvest
Net Tax Alpha	Alpha = Tax_Savings - Tracking_Error_Cost - Transaction_Costs	True value after implementation costs
Break-Even Holding Period	T_be = Tax_Savings / (Annual_Tracking_Error_Cost + Annual_Expense_Delta)	How long replacement can be held before costs exceed benefit
Wash-Sale Adjusted Basis	New_Basis = Replacement_Purchase_Price + Disallowed_Loss	Cost basis when wash sale is triggered
Annual TLH Capacity	Capacity = Portfolio_Value * Expected_Volatility * Loss_Capture_Rate	Estimate of harvestable losses per year
Target Harvest Amount	Target = Realized_Gains_YTD + Planned_Gains - Loss_Carryforward - 3000	Minimum harvest to zero out current-year tax

公式名称	表达式	适用场景
税收优惠	Benefit = Realized_Loss * Applicable_Tax_Rate	单笔收割的美元价值
净税收阿尔法	Alpha = Tax_Savings - Tracking_Error_Cost - Transaction_Costs	扣除实施成本后的真实价值
盈亏平衡持有期	T_be = Tax_Savings / (Annual_Tracking_Error_Cost + Annual_Expense_Delta)	成本超过收益前可持有替代证券的最长时间
虚售调整后成本基数	New_Basis = Replacement_Purchase_Price + Disallowed_Loss	触发虚售规则后的成本基数
年度TLH容量	Capacity = Portfolio_Value * Expected_Volatility * Loss_Capture_Rate	每年可收割损失的估算值
目标收割金额	Target = Realized_Gains_YTD + Planned_Gains - Loss_Carryforward - 3000	抵消当年应缴税额的最低收割额

Worked Examples

实操示例

Example 1: Single Position Harvest with Replacement Selection

示例1：单持仓收割+替代证券选择

Given:

Client holds 500 shares of XYZ Corp purchased at $80/share ($40,000 cost basis), current price $62/share ($31,000 market value), held 8 months (short-term)
Client has $12,000 in short-term realized gains YTD, marginal federal rate 35%, state rate 9.3%, NIIT applies (3.8%)
Replacement candidate: Sector ETF (correlation 0.97, tracking error 1.4% annualized, expense ratio 0.10% vs 0% for individual stock)

Calculate: Tax benefit, net tax alpha, and break-even holding period for the replacement.

Solution:

Unrealized loss: $31,000 - $40,000 = -$9,000 (short-term)
Applicable rate: 35% federal + 9.3% state + 3.8% NIIT = 48.1% combined
Tax benefit: $9,000 * 48.1% = $4,329
Transaction costs: Commission $0 (zero-commission broker) + estimated spread cost 0.05% * $31,000 * 2 trades = $31
Tracking error cost: 1.4% annualized * $31,000 * (30/365) = $36 (for the 30-day minimum hold)
Net tax alpha: $4,329 - $31 - $36 = $4,262
Annual cost of replacement: $31,000 * (0.10% expense + 1.4% tracking error drag estimate of 0.05%) = $46.50/year
Break-even holding period: $4,262 / $46.50 = 91.7 years — the tax benefit overwhelmingly justifies the swap
Action: Sell XYZ Corp (Spec ID, all lots), buy Sector ETF. Set wash-sale window reminder for 31 calendar days. Suspend any XYZ DRIP in all household accounts.

已知条件：

客户持有500股XYZ公司股票，买入价80美元/股（成本基数4万美元），当前价格62美元/股（市值3.1万美元），持有8个月（短期）
客户年初至今短期已实现收益1.2万美元，边际联邦税率35%，州税率9.3%，适用NIIT（3.8%）
替代标的：行业ETF（相关性0.97，年化跟踪误差1.4%，费率0.10%，个股费率为0%）

计算： 税收优惠、净税收阿尔法、替代证券的盈亏平衡持有期。

解答：

浮亏： 31000 - 40000 = -9000美元（短期）
适用税率： 35%联邦 + 9.3%州 + 3.8% NIIT = 48.1%综合税率
税收优惠： 9000 * 48.1% = 4329美元
交易成本： 佣金0美元（零佣金券商） + 预估点差成本0.05% * 31000 * 2笔交易 = 31美元
跟踪误差成本： 1.4%年化 * 31000 * (30/365) = 36美元（最低持有30天）
净税收阿尔法： 4329 - 31 - 36 = 4262美元
替代证券年度成本： 31000 * (0.10%费率 + 1.4%跟踪误差拖累预估0.05%) = 46.5美元/年
盈亏平衡持有期： 4262 / 46.5 = 91.7年 —— 税收优惠远高于置换成本
操作： 卖出XYZ公司股票（特定识别法，全批次），买入行业ETF。设置31天后的虚售窗口期提醒。暂停所有家庭账户中XYZ的DRIP。

Example 2: Portfolio-Wide TLH Scan with Gain/Loss Budget

示例2：全组合TLH扫描+收益/损失预算

Given:

$2M taxable portfolio, 15 equity positions, year is mid-October
Realized gains YTD: $18,000 long-term, $5,000 short-term
Loss carryforward from prior years: $0
Planned rebalancing trades will realize approximately $4,000 in additional long-term gains
Three positions show unrealized losses: Position A (-$14,000 LT), Position B (-$6,500 ST), Position C (-$2,100 LT)
Federal LTCG rate 20%, ordinary rate 37%, state 5%, NIIT 3.8%

Calculate: Target harvest amount, prioritized trade list, and total tax savings.

Solution:

Gain/loss budget:
- Total expected gains: $18,000 LT + $5,000 ST + $4,000 LT (planned) = $22,000 LT + $5,000 ST
- Loss carryforward: $0
- Target harvest: ($22,000 + $5,000) - $0 - $3,000 = $24,000 to fully offset gains and capture the $3,000 ordinary income deduction
Candidate ranking by tax benefit:
- Position B: $6,500 ST * (37% + 5% + 3.8%) = $6,500 * 45.8% = $2,977 (highest rate — harvest first)
- Position A: $14,000 LT * (20% + 5% + 3.8%) = $14,000 * 28.8% = $4,032 (largest absolute benefit)
- Position C: $2,100 LT * 28.8% = $605
Harvest plan: Harvest all three: $14,000 + $6,500 + $2,100 = $22,600 in total losses
- $5,000 ST losses offset $5,000 ST gains at 45.8% = $2,290 saved
- $1,500 remaining ST losses cross over to offset LT gains at 28.8% = $432 saved
- $16,100 LT losses offset $16,100 of $22,000 LT gains at 28.8% = $4,637 saved
- Remaining $5,900 LT gains still taxable; $3,000 ordinary income offset not reached (all losses consumed by gains)
- Total tax savings: $7,359
Coordinate with rebalancing: Position A is also 2% overweight — its TLH sell doubles as a rebalance sell, saving one round-trip trade.

已知条件：

200万美元应税投资组合，15只权益持仓，时间为10月中旬
年初至今已实现收益：1.8万美元长期，5000美元短期
往年亏损结转：0美元
计划再平衡交易将产生约4000美元额外长期收益
三只持仓存在浮亏：持仓A（-1.4万美元长期），持仓B（-6500美元短期），持仓C（-2100美元长期）
联邦长期资本利得税率20%，普通收入税率37%，州税率5%，NIIT 3.8%

计算： 目标收割金额、优先级交易清单、总节税金额。

解答：

收益/损失预算：
- 总预期收益：18000美元长期 + 5000美元短期 + 4000美元长期（计划） = 22000美元长期 + 5000美元短期
- 亏损结转：0美元
- 目标收割额：(22000 + 5000) - 0 - 3000 = 24000美元，可全额抵消收益并获得3000美元普通收入抵扣
候选标的按税收优惠排序：
- 持仓B：6500美元短期 * (37% + 5% + 3.8%) = 6500 * 45.8% = 2977美元（税率最高，优先收割）
- 持仓A：14000美元长期 * (20% + 5% + 3.8%) = 14000 * 28.8% = 4032美元（绝对收益最高）
- 持仓C：2100美元长期 * 28.8% = 605美元
收割计划： 全部收割三只标的，总损失14000 + 6500 + 2100 = 22600美元
- 5000美元短期损失抵消5000美元短期收益，税率45.8%，节税2290美元
- 剩余1500美元短期损失交叉抵消长期收益，税率28.8%，节税432美元
- 16100美元长期损失抵消22000美元长期收益中的16100美元，税率28.8%，节税4637美元
- 剩余5900美元长期收益仍需缴税；未达到3000美元普通收入抵扣（所有损失已用于抵扣收益）
- 总节税金额：7359美元
与再平衡协同： 持仓A同时超配2%，其TLH卖出同时可作为再平衡卖出，节省一笔往返交易。

Example 3: Wash-Sale Violation Across Accounts

示例3：跨账户虚售规则违规

Given:

On November 5, client sells VTI (Vanguard Total Stock Market ETF) in taxable account for a $8,000 long-term loss
On November 20 (15 days later), client's 401(k) makes its regular bi-weekly contribution, which includes an allocation to a Vanguard Total Stock Market Index Fund (institutional share class of the same fund)
401(k) contribution to the total stock market fund: $750

Calculate: Wash-sale impact and corrected cost basis.

Solution:

Wash-sale triggered: The 401(k) fund is substantially identical to VTI (same underlying index, same fund family). The purchase on November 20 falls within the 30-day post-sale window (November 5 + 30 = December 5).
Disallowed loss: The wash-sale disallowance is proportional to the replacement shares acquired. If 500 VTI shares were sold and the $750 401(k) purchase acquired the equivalent of approximately 3 shares at $250/share, then 3/500 = 0.6% of the loss is disallowed.
Disallowed amount: $8,000 * (3/500) = $48 disallowed
Remaining allowable loss: $8,000 - $48 = $7,952 — still deductible
Basis adjustment — 401(k) trap: The $48 disallowed loss would normally be added to the replacement security's cost basis. However, because the replacement was purchased inside a 401(k), the cost basis adjustment provides NO future tax benefit (401(k) distributions are taxed as ordinary income regardless of basis). The $48 is permanently lost.
Prevention: Before executing TLH, review the client's 401(k) fund lineup and contribution schedule. If the 401(k) holds a substantially identical fund, either (a) temporarily redirect that 401(k) allocation to a non-identical fund during the wash-sale window, or (b) delay the TLH sale until after the next 401(k) contribution and ensure no contribution occurs for 30 days after.

已知条件：

11月5日，客户在应税账户卖出VTI（Vanguard全市场ETF），产生8000美元长期损失
11月20日（15天后），客户的401(k)进行常规双周缴款，其中分配了Vanguard全市场指数基金（同一基金的机构份额类）
401(k)投向全市场基金的缴款额：750美元

计算： 虚售规则影响和修正后的成本基数。

解答：

触发虚售规则： 401(k)基金与VTI实质相同（同一底层指数，同一基金公司）。11月20日的买入属于卖出后30天窗口期内（11月5日+30天=12月5日）。
禁止抵扣损失： 禁止抵扣的损失与买入的替代股份比例成正比。如果卖出500股VTI，750美元401(k)缴款按250美元/股计算约买入3股，那么3/500=0.6%的损失被禁止抵扣。
禁止抵扣金额： 8000 * (3/500) = 48美元被禁止抵扣
剩余可抵扣损失： 8000 - 48 = 7952美元 —— 仍可抵扣
基数调整——401(k)陷阱： 48美元禁止抵扣的损失通常会被计入替代证券的成本基数。但由于替代证券是在401(k)中买入的，成本基数调整不会带来任何未来税收优惠（401(k)提取按普通收入计税，与基数无关）。48美元永久损失。
预防措施： 执行TLH前，检查客户的401(k)基金清单和缴款计划。如果401(k)持有实质相同基金，可以（a）在虚售窗口期内临时将401(k)分配转到非相同基金，或（b）延迟TLH卖出至下一次401(k)缴款之后，并确保卖出后30天内没有缴款。

Common Pitfalls

常见误区

Harvesting losses without checking for substantially identical holdings in retirement accounts, triggering permanent loss disallowance in IRAs/401(k)s
Forgetting to suspend DRIP on the sold security and related funds across all household accounts during the 61-day window
Harvesting small losses (under $1,000) where transaction costs and operational complexity exceed the tax benefit
Over-harvesting in early years, depressing cost basis so severely that future sales generate outsized gains (basis step-down compounding)
Failing to coordinate with spouse's automated investments (401(k) payroll contributions, robo-advisor purchases)
Selecting a replacement security that is substantially identical (same index, same fund family, different share class) — this does not avoid wash-sale rules
Not tracking the holding period of replacement securities, leading to unintended short-term gains when the replacement is later sold
Ignoring state tax differences when calculating harvest value — states with no income tax (FL, TX, NV) reduce the benefit by 5-13 percentage points versus high-tax states

收割损失前未检查退休账户中的实质相同持仓，触发IRA/401(k)的永久损失抵扣失效
忘记在61天窗口期内暂停所有家庭账户中卖出证券和相关基金的DRIP
收割小额损失（低于1000美元），交易成本和运营复杂度高于税收优惠
早年过度收割，大幅压低了成本基数，导致未来卖出产生过高收益（基数下降复利效应）
未与配偶的自动投资（401(k)工资缴款、智能投顾买入）协同
选择实质相同的替代证券（同一指数、同一基金公司、不同份额类）—— 无法规避虚售规则
未跟踪替代证券的持有期，后续卖出替代证券时产生意外的短期收益
计算收割价值时忽略州税差异——无所得税州（佛罗里达、德州、内华达）的收益比高税州低5-13个百分点

Cross-References

交叉参考

tax-efficiency (wealth-management plugin, Layer 5): broader tax-aware investing context; TLH is one strategy within the overall tax-efficiency framework
rebalancing (wealth-management plugin, Layer 4): TLH trades should be coordinated with rebalancing to minimize total transaction count
investment-suitability (compliance plugin, Layer 9): replacement securities must still satisfy suitability requirements
investment-policy (wealth-management plugin, Layer 5): IPS may specify TLH policy parameters (minimum loss threshold, approved replacement pairs)
performance-attribution (wealth-management plugin, Layer 5): tax alpha from TLH should be tracked and attributed separately
client-review-prep (advisory-practice plugin, Layer 10): TLH opportunities are flagged during periodic client review preparation
financial-planning-workflow (advisory-practice plugin, Layer 10): TLH is a specific tax recommendation that may emerge from the financial plan

tax-efficiency（财富管理插件，层级5）：更广泛的节税投资背景；TLH是整体节税框架中的一项策略
rebalancing（财富管理插件，层级4）：TLH交易应与再平衡协同，减少总交易次数
investment-suitability（合规插件，层级9）：替代证券必须满足适当性要求
investment-policy（财富管理插件，层级5）：投资政策声明（IPS）可能规定TLH政策参数（最低损失阈值、批准的置换对）
performance-attribution（财富管理插件，层级5）：TLH产生的税收阿尔法应单独追踪和归因
client-review-prep（顾问执业插件，层级10）：定期客户复盘准备期间标记TLH机会
financial-planning-workflow（顾问执业插件，层级10）：TLH是财务规划中可能产生的特定税务建议