Estimate US self-employment tax (Social Security + Medicare) on net earnings.
SE tax ≈ net earnings × 92.35% × 15.3% (12.4% Social Security + 2.9% Medicare). The Social Security portion caps at an annual wage base not modeled here.
Illustrative estimate only — tax rules change frequently and vary by jurisdiction/circumstance. Verify with an accountant or official source before relying on this.