Progressive Donation Calculator

After-Tax Annual Income

$0 $10k $100k $1M $10M $100M $1B

Cost of Living Area (optional)

San Francisco-Oakland-Berkeley, CA

Advanced Parameters

k (steepness)

p (progression)

Threshold

Max Rate (%)

Fit Your Own Curve

Set target donation rates at different incomes. The curve will be fitted to match your preferences.

Income Target Rate

Donation Rate -

Donation Amount - Take-home: -

Log scale (emphasize lower incomes)

10% Breakeven: - Below this income you donate less than 10%, above you donate more

10,000 US households: $-/year (-% avg rate, -% donate)

Expected per person: $-/year

Flat 10% (10k hh): $-/year

Expected per person: $-/year

10,000 is just under the number of GWWC pledgers. Estimates use raw incomes without COLA adjustments.

Find optimal progressive curves using CRRA utility. Max Utility: best for donors while raising a target amount. Max Donations: most raised while keeping donors at least as well off as a baseline.

Optimization Mode

Minimum Donations (10k households)

Elasticity of Marginal Utility (eta)

0.5 (less progressive) 3.0 (more progressive)

Higher eta = more weight on helping lower-income households.

Advanced Options

Restarts

Max Rate (%)

More restarts = better results, slower (5: ~5s, 20: ~20s)

Optimization Results

Optimal k -

Optimal p -

Threshold -

Total Raised (Progressive): -

Total Raised (Flat 10%): -

                                    Donation Gain vs Flat 10%:
                                    -
                                

                                    Utility Gain vs Flat 10%:
                                    -
                                

Rates at Example Incomes

Income	Flat 10%	Optimized	Donation