Common calculation errors, financing red flags and straight answers.
Most expensive business math mistakes are not arithmetic errors. They are wrong assumptions: using margin when you meant markup, comparing a factor rate to an interest rate, forgetting that early-payment discounts are expensive credit, or trusting a calculator that hides how it works.
The guides here collect those patterns, with worked examples that show how a small misunderstanding turns into real money. They also cover warning signs in financing offers and online tools, including pressure tactics and upfront fees that legitimate lenders do not charge.
Use these pages as a second-opinion step. Before you accept a loan offer, sign a processing agreement, set a price or pay an estimated tax installment, check the relevant guide to see whether you have fallen into one of the usual traps. When something still looks off, ask the provider for the terms in writing and consider a short consultation with a CPA, attorney or nonprofit small business advisor.
Mistakes, Red Flags and FAQ
Common calculation errors in pricing, forecasting, loans and taxes, with worked examples showing how each mistake distorts results and how to check your own numbers.
Mistakes, Red Flags and FAQ
Calculate the annualized cost of early-payment discounts, late fees and invoice factoring, and learn when taking or offering a discount makes sense for your cash flow.
Mistakes, Red Flags and FAQ
A factor rate of 1.3 sounds like 30 percent, but the annualized cost can be far higher. Learn the conversion math, worked examples and questions to ask before signing.
Mistakes, Red Flags and FAQ
Learn the warning signs of fake lenders, advance-fee loans, grant scams and misleading online calculators, plus how to verify a lender and where to report fraud.
Mistakes, Red Flags and FAQ
Compare spreadsheets, bookkeeping software and hiring an accountant by stage, complexity and cost of your time, with a decision framework and record-keeping basics.
