Tax Loss Harvesting Estimator

How to Use This Tool

Follow these steps to generate accurate tax loss harvesting estimates:

1. Select your IRS filing status from the dropdown menu to apply the correct net capital loss offset limit for ordinary income.
2. Enter all realized short-term and long-term capital gains and losses for the current tax year. Use positive numbers for all amounts (losses are subtracted automatically in the calculation).
3. Input your total ordinary taxable income and your marginal short-term and long-term capital gains tax rates (as percentages, e.g., 22 for 22%).
4. Click the Calculate Savings button to view your detailed tax savings breakdown.
5. Use the Reset button to clear all fields and start a new calculation.
6. Click Copy Results to Clipboard to save your breakdown for tax planning records.

Formula and Logic

This estimator uses IRS rules for capital gains and losses offsetting, current as of 2024 tax guidelines:

• Short-term capital gains (assets held ≤ 1 year) and losses are netted first: Net ST = ST Gains - ST Losses
• Long-term capital gains (assets held > 1 year) and losses are netted separately: Net LT = LT Gains - LT Losses
• If one net category is positive and the other negative, the loss category offsets the gain category first, with any remaining loss applied to the other category.
• Overall net capital gain/loss = Net ST + Net LT. If overall net is negative (loss), up to $3,000 ($1,500 for Married Filing Separately) can be used to offset ordinary taxable income.
• Tax savings from gains offset = (Offset amount) × (Applicable tax rate: short-term rate for ST gains, long-term rate for LT gains)
• Tax savings from ordinary income offset = (Amount offset) × (Marginal ordinary income tax rate, approximated using the higher of your ST or LT rate)
• Any net capital losses not used in the current year are carried forward to future tax years indefinitely.

Practical Notes

Keep these finance-specific considerations in mind when using this tool:

• Tax loss harvesting only applies to taxable brokerage accounts, not retirement accounts like 401(k)s or IRAs.
• Avoid wash sales: you cannot claim a loss if you buy the same or substantially identical asset within 30 days of selling at a loss. This tool does not account for wash sale rules, so adjust your loss amounts manually if applicable.
• Short-term capital gains are taxed at your ordinary income marginal tax rate, while long-term gains qualify for lower preferential rates (0%, 15%, or 20% for most filers in 2024).
• The $3,000 ordinary income offset limit is per tax return, not per filer. Married couples filing separately are limited to $1,500 each.
• Carried forward losses retain their original character (short-term or long-term) for future offsetting.
• This tool provides estimates only and does not constitute tax advice. Consult a certified public accountant (CPA) or tax professional for personalized planning.

Why This Tool Is Useful

Tax loss harvesting is a key year-end strategy for investors to reduce taxable income, and this tool simplifies complex calculations:

• Individual investors can quickly see how selling underperforming assets can lower their tax bill without manual math.
• Financial planners can model multiple scenarios for clients to optimize tax-efficient portfolio rebalancing.
• It accounts for filing status differences and separate short/long-term tax rates, which generic calculators often ignore.
• The detailed breakdown helps users understand exactly where tax savings come from, improving financial literacy around capital gains rules.
• Carryforward calculations help investors plan future tax years, avoiding surprises from unused losses.

Frequently Asked Questions

Can I use tax loss harvesting for cryptocurrency investments?

Yes, the IRS treats cryptocurrency as property, so capital gains and loss rules apply the same as stocks or ETFs. However, crypto wash sale rules are not currently enforced (as of 2024), but this may change with future legislation. Always verify current IRS guidance for crypto-specific rules.

What happens if my net capital losses exceed the $3,000 ordinary income offset?

Unused net capital losses are carried forward to the next tax year indefinitely. You can use these carried forward losses to offset future capital gains, and up to $3,000 per year against ordinary income, until the full loss is used up.

Does tax loss harvesting affect my adjusted gross income (AGI)?

Yes, net capital losses offset up to $3,000 of ordinary income reduce your taxable income, which in turn lowers your AGI. A lower AGI can qualify you for additional tax credits, deductions, or lower Medicare premiums.

Additional Guidance

For the most accurate results, gather the following documents before using the tool:

• Year-to-date brokerage statements listing all realized capital gains and losses, with holding periods marked.
• Your most recent tax return to confirm filing status and marginal tax rates.
• IRS Form 1099-B from your broker, which reports all proceeds from security sales.

Run calculations in December before year-end trading closes, as brokerages may have cutoff dates for realizing losses in the current tax year. If you have significant losses, consider spreading harvesting across multiple years to maximize the $3,000 annual ordinary income offset.