Tax Harvest Planner Calculator
Free tax harvest planner calculator maximizes tax free capital gains harvesting with lot ranking recommendations. See harvested gain, tax saved, and basis step up before year end deadline.
Harvest Room Remaining
$2,500.00
Tax Saved
$500.00
| Ticker | Gain | Harvest Room Remaining |
|---|---|---|
| AAPL | $4,000.00 | $2,500.00 |
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How It Works
Enter tax free allowance for capital gains, realized gains already taken this tax year, marginal tax rate, and capital gains tax rate. Add investment lots with ticker, shares, cost basis, and current price. The tool ranks harvestable gains and recommends which lots to sell before allowance expires. UK investors with three thousand pound CGT allowance might harvest three thousand pounds gain at zero tax then rebuy identical shares with stepped up base cost. US investors face different wash sale rules on losses but gain harvesting up to zero percent LTCG bracket can still reset basis strategically. Add each lot with accurate cost basis including reinvested dividends and stock split adjustments before ranking harvest candidates by gain size.
Review harvest room remaining after realized gains, total tax saved from recommended harvest, and lot list sorted by largest gain first. Harvesting gains resets cost basis higher which reduces future tax on the same shares. Pair with Wash Sale Alert before repurchasing sold positions within thirty days when harvesting losses. Lot level detail matters when some lots are underwater and others are winners. This tool focuses on gain harvesting to fill allowance. Pair loss harvesting with separate workflow and wash sale calendar before repurchasing losing positions. Tax saved estimate uses marginal rate on harvested gains capped by remaining allowance room after realized gains year to date already consumed.
Batch harvest losses and gains in same tax year to offset realized gains against realized losses before deduction cap. Verify broker reports the adjusted cost basis correctly after wash sale adjustments settle. Harvesting gains raises basis which reduces future taxable gain when you eventually sell the same shares. Document each harvested lot and replacement purchase date for CPA reconciliation at year end tax filing time.
Use Tax Harvest Planner whenever inputs change: after market moves, new contributions, or revised personal assumptions. Bookmark the page for quick reruns without installing software.
Step by step
- Enter tax free allowance, realized gains YTD, marginal rate, and add lots with basis and price
- Review harvest room, tax saved, and recommended lots ranked by gain size
- Execute harvest trades before tax year end and document basis for replacement purchases
Worked example
Enter tax free allowance for capital gains, realized gains already taken this tax year, marginal tax rate, and capital gains tax rate. Enter the sample inputs described in How it works to reproduce the scenario step by step.
Adjust one input at a time to see sensitivity. Tax Harvest Planner updates instantly so you can stress test optimistic and conservative assumptions before acting.
When to use this calculator
Reach for Tax Harvest Planner when maximize tax free capital gains harvesting with lot recommendations.. It suits quick what if analysis before trades, allocation changes, or plan updates.
Pair with related tools when the decision spans taxes, liquidity, or multi year projections beyond what one formula captures.
Common mistakes
Copying outputs without checking input units or stale market prices is a frequent error with Tax Harvest Planner. Confirm tickers, percentages, and dates before acting.
Running a single baseline scenario ignores tail risks. Stress test with conservative inputs and compare against related tools listed below when the decision is material.
The Formula
harvestableGain = max(0, taxFreeAllowance - realizedGains)
taxSaved = harvestableGain × (marginalTaxRate / 100)
For each lot: gain = (currentPrice - costBasis) × shares
Harvest lots sorted by largest gain first until harvestableGain is exhausted
Harvest room equals allowance minus realized gains YTD. Tax saved equals min lot gain, remaining room times marginal rate. Sorts lots descending by gain. Lot sorting by largest gain first maximizes tax free allowance usage efficiency before year end deadline.
Limitations and assumptions
Harvest room equals allowance minus realized gains YTD. Tax saved equals min lot gain, remaining room times marginal rate. Sorts lots descending by gain. Lot sorting by largest gain first maximizes tax free allowance usage efficiency before year end deadline. Tax Harvest Planner does not replace personalized advice. Fees, slippage, account specific rules, and behavioral constraints may change real world outcomes.
Key terms
- How does tax gain harvesting work
- Tax gain harvesting sells appreciated shares up to your annual tax free allowance then rebuys to reset cost basis higher.
- What inputs do I need
- Harvest room equals allowance minus realized gains.
- Model assumption
- Tax saved equals harvestable gain times marginal tax rate for gains within allowance.
Compare alternatives
Check wash sale rules with Wash Sale Alert, estimate full year CGT with Capital Gains Tax calculator, and compare ETF tax structures with Accumulating vs Distributing on portfolios. Use those calculators when tax harvest planner alone does not capture the full decision.
Internal links on portfolios.tools help you chain calculators: run Tax Harvest Planner first, then validate edge cases with a specialized tool from the related section below.
FAQ
How does tax gain harvesting work?
Tax gain harvesting sells appreciated shares up to your annual tax free allowance then rebuys to reset cost basis higher. You use allowance that would otherwise expire unused. Applies in jurisdictions with annual capital gains exemptions. Gain harvesting resets basis higher which reduces future taxable gain on same shares after repurchase in allowance filling strategy.
What inputs do I need?
Harvest room equals allowance minus realized gains. Tax saved equals harvested gain times marginal rate capped by remaining room. Add each lot with accurate cost basis including reinvested dividends in basis.
How is tax saved calculated?
Tax saved equals harvestable gain times marginal tax rate for gains within allowance. Tool sorts lots by largest gain first to maximize allowance usage efficiency.
Why does it recommend selling the biggest gainers first?
Calculator sorts by largest gain first and fills allowance with biggest winners. Strategy maximizes basis step up per allowance dollar consumed.
Does wash sale apply to gain harvesting?
Run Wash Sale Alert before repurchasing after loss harvest. Gain harvest rebuy does not trigger wash sale on gains but loss harvest within thirty days disallows loss deduction. Coordinate with CPA before executing trades near year end in complex trust structures. Document harvested lots and replacement purchase dates for CPA review. Coordinate trust and taxable account harvesting rules before year end batch trades execute.
How do I use this tax harvest planner calculator on a phone or tablet?
Yes. Tax Harvest Planner runs entirely in your mobile browser with the same formulas as desktop. Optional localStorage may remember inputs on your device when enabled in browser settings.
Where is my data stored when I use Tax Harvest Planner?
Nowhere on our servers. Calculations execute locally in your browser. Optional localStorage saves form fields on your device only and never transmits portfolio numbers over the network.
Should I rely on Tax Harvest Planner for tax or legal decisions?
No. Tax Harvest Planner provides educational math only. Tax law, account rules, and personal circumstances vary. Consult a qualified tax or legal professional before transactions with material consequences.
Related Tools
Check wash sale rules with Wash Sale Alert, estimate full year CGT with Capital Gains Tax calculator, and compare ETF tax structures with Accumulating vs Distributing on portfolios.tools.