Tools & Calculators

Tools & Calculators

How to Calculate Invoice Totals: Complete Guide with Examples

Master invoice calculations with this comprehensive guide. Step-by-step examples for line items, tax calculations, discounts, deposits, international invoicing, and industry-specific formulas. Includes free invoice calculator.

Tools & Calculators

How to Calculate Late Fees on Invoices: Complete Guide 2026

Learn how to calculate late fees on invoices using flat fees, percentage, simple interest, and compound interest. Includes formulas, examples, and legal considerations.