Best CSV format for bulk invoice generation
A good CSV invoice file is boring in the best way: one header row, consistent columns, stable invoice identifiers, and no hidden data trapped in merged cells or notes. The cleaner the CSV, the faster the invoice mapping step becomes.
Use predictable column names
Choose names that describe the invoice field clearly: invoice_no, customer_name, billing_address, issue_date, due_date, payment_terms, item_description, quantity, unit_price, subtotal, tax_amount, and total_due.
Repeat the invoice number for itemized rows
For itemized invoices, every row that belongs to the same invoice should repeat the same invoice_no. This lets the invoice generator group the rows into one customer invoice.
Keep money fields consistent
Use one currency convention and numeric format. Avoid mixing symbols, commas, text notes, and empty calculations in the same amount column.
Do not put important data only in comments
Invoice numbers, dates, totals, customer names, and item descriptions should live in their own columns so they can be mapped into the template.
Preview before exporting every invoice
Before generating the full batch, preview records with short and long customer names, multiple line items, discounts, taxes, and edge-case totals.