Machine-Readable Results

API / URL Parameters

Compute optimal tax rates programmatically via URL parameters. All computation is performed client-side — no server required.

URL Format

/api?epsilon=0.25&a=1.75&g=0.00

Parameters

Parameter	Type	Range	Default	Description
epsilon	float	0.01–1.0	0.25	Elasticity of taxable income
a	float	1.0–4.0	1.75	Pareto parameter of income distribution
g	float	0.0–1.0	0.0	Social welfare weight on top earners

Try It

epsilon

{
  "epsilon": 0.25,
  "a": 1.75,
  "g": 0,
  "tau_star": 69.5652,
  "tau_star_fraction": 0.695652,
  "type": "revenue-maximising",
  "formula": "tau* = 1 / (1 + a * epsilon)",
  "reference": "Saez (2001). Review of Economic Studies, 68(1), 205-229.",
  "warnings": {
    "high_elasticity": false,
    "low_pareto": false
  },
  "computed_at": "2026-05-04T13:21:41.934Z"
}