Capital Gains Tax Calculator

Capital Gains Tax is evaluated from Cost Basis, Sale Price and Holding Period. The calculation reports Capital Gain, Applicable Tax Rate and Estimated Tax Owed.

Results

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About the Capital Gains Tax Calculator

Capital Gains Tax is treated here as a quantitative relation between Cost Basis, Sale Price, Holding Period and Filing Status and Capital Gain, Applicable Tax Rate, Estimated Tax Owed and Net Proceeds After Tax.

The calculator uses a custom php logic configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.

Formula basis:
Capital Gain = Sale Price - Cost Basis
For Short-Term: Tax Rate = Your ordinary income marginal rate
For Long-Term (Single 2024):
- If (income + gain) <= $47,025: Rate = 0%
- If income <= $47,025 but (income + gain) > $47,025: Rate = 0% on gain up to $47,025, 15% on remainder
- If income > $47,025 and <= $518,900: Rate = 15%
- If income > $518,900: Rate = 20% on gain above $518,900 threshold
Tax Owed = Capital Gain x Applicable Rate (simplified; actual calculation uses stacking)
Net Proceeds = Sale Price - Cost Basis - Tax Owed

Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.

Formula & How It Works

The calculation applies the following relations exactly as recorded in the metadata:

Capital Gain = Sale Price - Cost Basis
For Short-Term: Tax Rate = Your ordinary income marginal rate
For Long-Term (Single 2024):
- If (income + gain) <= $47,025: Rate = 0%
- If income <= $47,025 but (income + gain) > $47,025: Rate = 0% on gain up to $47,025, 15% on remainder
- If income > $47,025 and <= $518,900: Rate = 15%
- If income > $518,900: Rate = 20% on gain above $518,900 threshold
Tax Owed = Capital Gain x Applicable Rate (simplified; actual calculation uses stacking)
Net Proceeds = Sale Price - Cost Basis - Tax Owed

Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.

Worked Examples

Example 1: Long-Term Stock Sale — 15% Rate

Inputs

cost_basis: 15000 sale_price: 42000 holding_period: long filing_status: single annual_income: 78000

Capital Gain: $27,000. Applicable Tax Rate: 15%. Estimated Tax Owed: $4,050. Net Proceeds After Tax: $37,950

With Cost Basis = 15,000, Sale Price = 42,000, Holding Period = long and Filing Status = single as the stated inputs, the result is Capital Gain = $27,000, Applicable Tax Rate = 15% and Estimated Tax Owed = $4,050. Each value corresponds to the declared output fields.

Example 2: Short-Term Stock Trade — Ordinary Rate

Inputs

cost_basis: 10000 sale_price: 18500 holding_period: short filing_status: single annual_income: 70000

Capital Gain: $8,500. Applicable Tax Rate: 15%. Estimated Tax Owed: $1,275. Net Proceeds After Tax: $17,225

With Cost Basis = 10,000, Sale Price = 18,500, Holding Period = short and Filing Status = single as the stated inputs, the result is Capital Gain = $8,500, Applicable Tax Rate = 15% and Estimated Tax Owed = $1,275. Each value corresponds to the declared output fields.

Example 3: 0% Rate — Lower Income

Inputs

cost_basis: 5000 sale_price: 18000 holding_period: long filing_status: single annual_income: 30000

Capital Gain: $13,000. Applicable Tax Rate: 15%. Estimated Tax Owed: $1,950. Net Proceeds After Tax: $16,050

With Cost Basis = 5,000, Sale Price = 18,000, Holding Period = long and Filing Status = single as the stated inputs, the result is Capital Gain = $13,000, Applicable Tax Rate = 15% and Estimated Tax Owed = $1,950. Each value corresponds to the declared output fields.

Example 4: Real Estate Sale — Primary Home

Inputs

cost_basis: 275000 sale_price: 620000 holding_period: long filing_status: mfj annual_income: 160000

Capital Gain: $345,000. Applicable Tax Rate: 15%. Estimated Tax Owed: $51,750. Net Proceeds After Tax: $568,250

With Cost Basis = 275,000, Sale Price = 620,000, Holding Period = long and Filing Status = mfj as the stated inputs, the result is Capital Gain = $345,000, Applicable Tax Rate = 15% and Estimated Tax Owed = $51,750. Each value corresponds to the declared output fields.

Common Use Cases

Calculate tax owed on selling a stock or ETF
Estimate capital gains tax on a real estate sale
Decide between selling short-term vs waiting for long-term rates