Charitable Deduction Calculator Formula
Understand the math behind the charitable deduction calculator. Each variable explained with a worked example.
Formulas Used
Tax Savings
tax_savings = donation_amount * marginal_rate / 100Net Cost of Donation
net_cost = donation_amount * (1 - marginal_rate / 100)Effective Discount
effective_discount = marginal_rateVariables
| Variable | Description | Default |
|---|---|---|
donation_amount | Donation Amount(USD) | 5000 |
marginal_rate | Marginal Tax Rate(%) | 22 |
How It Works
Charitable Deduction Tax Savings
Tax Savings = Donation x Marginal Tax Rate
Net Cost = Donation x (1 - Tax Rate)
Charitable donations are deductible only if you itemize. They must be to qualified 501(c)(3) organizations.
Worked Example
$5,000 donation at 22% marginal rate.
donation_amount = 5000marginal_rate = 22
- 01Tax savings = $5,000 x 22% = $1,100
- 02Net cost = $5,000 - $1,100 = $3,900
Ready to run the numbers?
Open Charitable Deduction Calculator