The original title is "I Built an Open-Source Seller Earnings Calculator for Software Marketplaces"

Short summary

A developer built an open-source Seller Earnings Calculator in TypeScript to help marketplace sellers understand how commissions, payment fees, VAT, refunds, and other deductions reduce actual payouts. The post explains common calculation mistakes—especially around VAT-inclusive pricing—and details how each fee layer compounds. The calculation engine is published on GitHub and a live calculator is available.

• •Open-source TypeScript calculator for estimating net seller earnings on software marketplaces
• •Covers VAT-inclusive vs exclusive pricing, marketplace commissions, payment fees, refunds, and affiliate costs
• •Fixed transaction fees disproportionately impact low-priced digital products

Generated with AI, which can make mistakes.