Tax-Loss Harvesting for Business Owners: How to Turn Investment Losses Into Tax Savings

By Yarik Yarosh, CPA ·September 5, 2026 ·7 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

Every realized investment loss is a potential tax asset. Under IRC 1211, capital losses first offset capital gains dollar-for-dollar (short-term losses offset short-term gains first, then long-term gains, and vice versa), and any remaining net capital loss can offset up to $3,000 of ordinary income per year. For a business owner in the 37% bracket, the $3,000 deduction saves $1,110 per year, which over a decade of carryforward can offset $33,000 in gains. But the real power of tax-loss harvesting isn’t the $3,000 annual ordinary income offset; it’s the ability to time the realization of losses to offset specific capital gains events. A business owner who sells a property for a $500,000 capital gain can harvest $500,000 of paper losses in the investment portfolio the same year, reducing the capital gains tax to zero. The investment portfolio’s composition does not change (the harvested positions are replaced with similar, non-identical investments), but the tax bill is reduced by $119,000 (23.8% of $500,000). The wash sale rule (IRC 1091) is the primary constraint: if the taxpayer buys “substantially identical” securities within the 61-day wash sale window, the loss is disallowed and added to the basis of the replacement shares.

✓Key takeaway

Tax-loss harvesting rules:

Rule	Details
Capital loss netting	Short-term losses offset short-term gains first; long-term losses offset long-term gains first; then net against each other
Ordinary income offset	$3,000/year max ($1,500 MFS)
Carryforward	Indefinite (character preserved: short-term stays short-term, long-term stays long-term)
Wash sale window	61 days (30 days before + sale date + 30 days after)
Substantially identical	Same stock, same bond, same mutual fund; NOT the same sector ETF vs. individual stock
Wash sale in IRA	Loss permanently disallowed (cannot be added to basis of IRA shares)
Cryptocurrency	Wash sale rule doesn’t currently apply (property, not a security); may change with future legislation

Capital gains tax rates (2025):

Type	Rate
Short-term capital gains (held ≤ 1 year)	Ordinary income rates (up to 37%)
Long-term capital gains (held > 1 year)	0%, 15%, or 20% (depending on income)
Net Investment Income Tax (NIIT)	Additional 3.8% on the lesser of NII or MAGI above $250,000 MFJ
Collectibles gain	28%
Unrecaptured Section 1250 gain (real property depreciation)	25%

How does tax-loss harvesting work for business owners?

Hypothetical example

Round numbers. A business owner in the 37% bracket has the following investment results for the year:

Portfolio gains and losses:

Investment	Gain/Loss	Holding Period	Character
Stock A (sold)	+$200,000	3 years	Long-term capital gain
Stock B (sold)	+$50,000	8 months	Short-term capital gain
Stock C (paper loss)	-$120,000	2 years	Long-term (if sold)
Stock D (paper loss)	-$80,000	5 months	Short-term (if sold)
Real property sale	+$300,000	10 years	Long-term capital gain

Without tax-loss harvesting:

Item	Amount	Tax
Long-term capital gains (A + real property)	$500,000	$119,000 (23.8%)
Short-term capital gains (B)	$50,000	$18,500 (37%)
Total capital gains tax		$137,500

With tax-loss harvesting (sell C and D):

Step	Calculation
Step 1: Net short-term	$50,000 gain (B) - $80,000 loss (D) = ($30,000) net short-term loss
Step 2: Net long-term	$500,000 gain (A + property) - $120,000 loss (C) = $380,000 net long-term gain
Step 3: Combine	$380,000 long-term gain - $30,000 short-term loss = $350,000 net long-term gain
Tax on $350,000 LTCG	$83,300 (23.8%)
Tax savings from harvesting	$54,200

Replacement strategy (avoiding wash sales):

Sold	Replacement (not substantially identical)	Wait Period
Stock C (large-cap tech stock)	Large-cap tech ETF (different fund, different index)	Can buy immediately
Stock D (S&P 500 index fund)	Total stock market ETF (different index, broader)	Can buy immediately
Alternative: Wait 31 days	Repurchase the same stock after the wash sale window	31 calendar days

Year-round harvesting strategy:

Quarter	Action
Q1	Review portfolio for losses after any Q4/January market volatility
Q2	Mid-year check; harvest losses if gains have been realized
Q3	Pre-planning for year-end; identify candidates for harvesting
Q4 (October-November)	Primary harvesting window; realize losses before December 31
Q4 (December)	Beware: selling in December and buying back in January still within the 61-day window

Advanced strategies for business owners:

Strategy 1: Offset a business sale with portfolio losses Business owner sells a business for a $1,000,000 capital gain. In the same year, the owner harvests $600,000 of unrealized losses from the investment portfolio.

Item	Amount
Business sale capital gain	$1,000,000
Harvested portfolio losses	($600,000)
Net capital gain	$400,000
Tax on $400,000 (23.8%)	$95,200
Tax without harvesting (23.8% on $1,000,000)	$238,000
Savings	$142,800

Strategy 2: Harvest losses to offset concentrated stock gains An executive exercises stock options, producing a $500,000 short-term capital gain (or ordinary income). The executive harvests $300,000 of long-term losses from other positions.

Item	Amount
Option exercise gain (ordinary income/STCG)	$500,000
Harvested long-term losses	($300,000)
Long-term losses first offset long-term gains ($0)	$0 used
Remaining long-term losses offset short-term gains	($300,000)
Net short-term gain	$200,000
Tax savings (37% x $300,000 offset)	$111,000

Note: long-term losses offsetting short-term gains is less efficient than short-term losses offsetting short-term gains (you lose the rate differential), but it still produces real tax savings.

Strategy 3: Cryptocurrency loss harvesting (no wash sale rule)

Action	Details
Sell Bitcoin at a $100,000 loss	Recognize the loss
Immediately repurchase Bitcoin	No wash sale rule (cryptocurrency is property, not a security)
Net effect	$100,000 loss recognized; same Bitcoin position maintained; basis reset to lower purchase price
Tax savings (23.8% or 37% depending on character)	$23,800-$37,000

This strategy may change if Congress extends the wash sale rule to cryptocurrency in future legislation.

Common mistakes in tax-loss harvesting:

Mistake	Consequence
Buying substantially identical securities within 31 days	Wash sale: loss disallowed, added to basis of new shares
Wash sale in IRA (buy in IRA within 31 days of selling in taxable account)	Loss permanently disallowed (cannot be added to IRA basis)
Harvesting a loss in December, buying back in January	Still within the 61-day window (31 days after the sale)
Ignoring state taxes	State capital gains taxes (up to 13.3% in California) amplify the benefit of harvesting
Harvesting a loss and forgetting about the lower basis	Future sale at a gain will be larger because basis is lower
Triggering short-term gains by selling replacement position too soon	Hold replacement position for at least 1 year to maintain long-term character

Illustrative numbers only, not a real client and not advice for your facts.

Related guides:

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Cite this page

Yarik Yarosh, CPA. "Tax-Loss Harvesting for Business Owners: How to Turn Investment Losses Into Tax Savings." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-tax-loss-harvesting-strategies-business-investments

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.