Categories Reference
How transactions are organized into categories for taxes and unit economics.
Invoices and Receipts
What invoices and receipts are, what data each contains, and how they differ.
Counterparties
What counterparties are and how they work. A counterparty is any business or person on the other side of your transactions.
Nexus Reference
Quick reference for sales tax nexus. When you're required to collect and remit tax, US thresholds vs EU/UK rules.
Schedule C Lines Reference
Quick reference for IRS Schedule C expense lines. Which line to use for each type of business expense.
VAT Reference
Quick reference for VAT terms, money flows, and credit mechanisms. How output VAT, input VAT, and reclaims work.