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Tax-Loss Harvesting Basics

TLH and State Taxes

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TLH and State Taxes

In high-tax states, capital gains are taxed by both the federal government and the state. Tax-loss harvesting becomes far more attractive when state rates are included: a loss that saves 20% federally might save 30–45% when state tax is factored in.

Key takeaways​

  • California (13.3%), New York (8.82%), and New Jersey (8.97%) state capital gains rates compound with federal rates, pushing combined marginal rates to 45–57%.
  • A $100,000 loss in California saves $44,600 in combined federal + state tax (vs. $23,700 in a 0% state tax jurisdiction).
  • State-level alternative minimum tax (California), city income tax (New York City), and wage-based surtaxes (New York) create additional pressure to reduce taxable income.
  • Even residents of moderate-tax states benefit from TLH, since capital gains are almost always taxed at higher rates than the state's standard income tax.
  • TLH can become a partial hedge against state tax rate hikes, since losses realized today protect future income at unknown future rates.

The compounding effect of state and federal tax​

Most discussions of tax-loss harvesting focus only on federal capital gains tax (20% for long-term, 37% for short-term + 3.8% net investment income tax = 40.8% at the top). But high-income earners in tax-heavy states face an additional layer.

Here's how it compounds:

Example 1: Investor in Texas (0% state tax)

  • Realized long-term capital gain: $100,000
  • Federal tax (20% + 3.8% NIIT): $23,800
  • State tax: $0
  • Total tax rate: 23.8%

Example 2: Same investor in California (13.3% state tax)

  • Realized long-term capital gain: $100,000
  • Federal tax (20% + 3.8% NIIT): $23,800
  • State tax (13.3%): $13,300
  • Total tax rate: 37.1%

The Californian pays nearly $10,000 more tax on the same $100,000 gain. Conversely, a $100,000 loss in California saves $37,100 in combined tax, versus only $23,800 in Texas.

This is why TLH is almost a moral imperative for high earners in California, New York, New Jersey, Maryland, Oregon, and Vermont. The tax savings are simply too large to ignore.

State-specific tax mechanics​

California: The 13.3% rate and AMT​

California's top capital gains tax rate is 13.3%, the highest in the nation. For a married couple filing jointly earning over $679,000, both standard income tax and capital gains are taxed at 13.3%.

Additionally, California has a state-level Alternative Minimum Tax (AMT) that can affect high-net-worth individuals. While the federal AMT has been largely neutralized by recent tax law changes, California's AMT remains active. For some investors, harvesting losses can help manage AMT liability by reducing taxable income and keeping adjusted gross income (AGI) below the AMT threshold.

Practical impact: A $100,000 loss in California saves $13,300 in state tax alone, before any federal savings. For someone with $200,000+ in annual income, this is massive.

New York: 8.82% plus city tax​

New York State's top capital gains rate is 8.82% (for income over $215,400 for single filers). But New York City residents face an additional layer: a city income tax starting at 3.9% and rising to 3.9% for top earners. The city tax is deductible against the state tax calculation but not the federal.

For a New York City resident earning $500,000:

  • Federal capital gains tax: 23.8%
  • New York State tax: 8.82%
  • New York City tax: 3.9%
  • Combined: 36.52%

A $50,000 loss saves $18,260 in combined tax.

New Jersey: 8.97% plus surtax​

New Jersey's top rate is 8.97%. Additionally, New Jersey imposes a Millionaire's Tax (additional 1.75%) on income over $1 million. For investors in that bracket, the combined rate reaches 10.72%, adding $5,360 in state tax savings per $100,000 loss.

Moderate-tax states: Still worth doing​

Even in lower-tax states, TLH makes sense. Texas, Florida, Nevada, Tennessee, and Washington have zero state income tax, but the federal savings alone (23.8–40.8%) justify loss harvesting. Investors in moderate-tax states (Illinois 4.95%, Colorado 4.63%, Pennsylvania 3.07%) benefit from combined rates of 27–44%, sufficient to make TLH a priority.

The strategy adjustments for high-tax states​

Investors in high-tax states should adjust their TLH approach:

1. Lower loss-harvest threshold

In a low-tax state, you might only harvest losses if the position has declined 10%+ (to avoid trading costs and substitution drag). In California, harvesting losses as small as 5% often makes economic sense, because the tax savings are so large.

Example:

  • Position with $100,000 cost basis, now worth $95,000 (5% loss).
  • Trading cost to harvest (commissions + bid-ask spread): roughly $50.
  • In Texas: Tax savings $1,190 (5% × 23.8%). Net gain: $1,140.
  • In California: Tax savings $1,855 (5% × 37.1%). Net gain: $1,805.

In California, even a 3–4% loss can be worth harvesting.

2. Harvest more frequently

In high-tax jurisdictions, consider harvesting losses semi-annually (after market declines in March/April and September/October). This requires more trades and more broker coordination, but the tax savings justify the effort for taxable accounts above $500K.

3. Be strategic about residence changes

If you're considering moving from California to Texas or Florida, timing matters. Before the move, harvest as many losses as possible while you're still a California resident. After moving (and establishing residency in the new state), you can realize gains on positions that have recovered, taxed at the lower rate.

Concrete example: State-arbitrage harvest​

Scenario: You're planning to move from California to Texas in 2026.

  • Current taxable account: $1.2 million
  • Embedded losses: $180,000 across various positions
  • Embedded gains: $420,000 across other positions

2025 strategy (while still a California resident):

  • Harvest the $180,000 in losses, saving roughly $66,780 in California tax.
  • Don't realize the $420,000 gains yet.

2026 (after moving to Texas):

  • Sell the positions with $420,000 gains.
  • Because you're now a Texas resident, you pay only federal tax (23.8%), saving $15,120 compared to California tax.

Total tax savings from the move strategy: $81,900+.

Minimizing state tax drag through location choice​

A few high-earners in extreme tax states (California, New York) have considered moving to lower-tax jurisdictions specifically to optimize taxes. This is viable but requires genuine relocation (not just a temporary mailing address change). The IRS and state tax authorities have strict residency rules.

To establish residency in a new state, you typically need:

  • A lease or property ownership agreement.
  • Updated driver's license and vehicle registration.
  • Voter registration and tax filings in the new state.
  • Minimal time spent in the old state (under 60 days per year, rules vary).

For a $5 million portfolio, moving from California to Nevada could save $150K+ annually. But there are costs: relocation expenses, loss of social network, lifestyle changes. This strategy only makes sense if the move aligns with other life goals (retirement location, family, career).

State tax credits and carryforwards​

One often-overlooked detail: state loss carryforwards.

If you realize more losses than gains in a given year, the excess loss can usually be carried forward to future years (rules vary by state). California allows indefinite carryforward. New York allows a 20-year carryforward. Federal law allows indefinite carryforward.

This means if you harvest $150,000 of losses in 2025 but only have $50,000 of gains, the remaining $100,000 of loss can offset future gains. For high-turnover investors or those managing concentrated positions, this is important: you don't need to pair every loss harvest with a same-year gain realization.

The wash-sale rule and state taxes​

An important nuance: the IRS wash-sale rule (30 days before/after) applies to federal taxes. Some states (California, New York) have their own wash-sale rules with slightly different timing. Verify your state's specific rule; generally, following the federal 30-day window covers both, but confirm with a CPA.

Coordination with Roth conversions​

In high-income years, some investors use a combination of TLH and Roth conversions to manage state (and federal) taxes:

  1. Harvest losses in January to offset income.
  2. Use the tax savings to fund a Roth conversion (converting pre-tax IRA money to Roth).
  3. The Roth conversion is taxable, but the loss harvest offsets it.

This is complex and requires careful coordination with a CPA, but it can move money into a Roth (tax-free growth forever) with minimal incremental tax cost in high-tax states.

Who benefits most: High earners in high-tax states​

The investors who benefit most from TLH are:

  1. Income over $200K (single) or $400K+ (married) earning in California, New York, or New Jersey.
  2. Self-employed or business owners in high-tax states (where quarterly estimated taxes are painful; TLH loss harvesting reduces quarterly payments).
  3. Those in the peak earning years (35–55) before expected retirement income decline.
  4. Investors with taxable accounts above $250K (where the time cost of TLH is justified by the savings).

Conversely, TLH is less critical for:

  • Tax-deferred account holders (IRAs, 401(k)s) where TLH offers no benefit.
  • Those in tax-free states with lower total incomes.
  • Early-stage investors with small portfolios (under $100K).

Implementation in high-tax states​

If you live in a high-tax state and want to prioritize TLH:

  1. Work with a CPA familiar with state tax rules. Each state has quirks. An out-of-state CPA might miss opportunities specific to your state.

  2. Document realized losses and gains separately by state (if you've moved). Some states have different carryforward rules.

  3. Use a robo-advisor with direct indexing (Wealthfront, Betterment) if available in your state. Their automated loss harvesting is designed with state taxes in mind.

  4. Monitor state tax rate changes. In 2022–2024, several states proposed or implemented rate changes. If rates are rising, harvest losses sooner; if falling, harvest later.

  5. Consider quarterly estimated tax planning. If you're self-employed or have investment income, TLH can reduce your quarterly estimated tax payments, freeing up cash.

Flowchart: TLH priority in your state​

Next​

We've seen how state taxes amplify the value of TLH. Now we'll quantify the actual after-tax savings from TLH across different scenarios, using historical data and studies on the real-world impact.