We Show The Math.
Every calculator on this site shows you the formula behind the result — step by step, with IRS citations.
Most calculators are black boxes.
You enter a number, get a result, and have no idea how it was calculated. We think that's broken.
SE Tax on $75,000 — the actual math:
Step 1: Gross × 0.9235 = Net SE Income
$75,000 × 0.9235 = $69,263
Step 2: Net SE × 0.153 = SE Tax
$69,263 × 0.153 = $10,597
Step 3: SE Tax ÷ 2 = Deductible Half
$10,597 ÷ 2 = $5,299
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Why it matters
Freelancers and contractors make $10,000+ decisions based on these numbers. Knowing the formula means knowing whether to trust the result.