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William Hayes
Written by
William Hayes
Last updated
July 13, 2026

Analyzing Monthly Running Costs for a Party Supply Store


Frequently Asked Questions

Total monthly operating expenses (OpEx) start around $15,000 in Year 1 (2026), excluding inventory This includes $4,650 in fixed overhead and $10,000 in payroll You must generate over $17,000 in monthly revenue to cover all costs, including the 170% COGS ratio;

William Hayes
About the author

William Hayes

Small Business Consultant

William Hayes is a small business consultant at Financial Models Lab who writes for early-stage founders building a basic plan before investing money. He focuses on business plan basics and practical everyday business finance, helping readers use realistic assumptions to understand revenue, expenses, and profit in simple terms. His direct, useful approach is designed to give new founders a clearer path from idea to informed decision.