https://docs.whmcs.com/9-1/tags/proforma-invoices/Recent content in proforma-invoices onHugo -- gohugo.iohttps://docs.whmcs.com/9-1/payments/tax-configuration/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/payments/tax-configuration/Details General Settings fields like Tax/VAT ID Number and Inclusive/Exclusive Tax, VAT Settings fields including VAT Mode, VAT Number Validation, and UK VAT Validation Mode, steps to add or update tax rules, and Advanced Settings for Taxed Items and Calculation Mode.https://docs.whmcs.com/9-1/billing-and-invoicing/invoicing-tutorials/enable-proforma-invoicing/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/billing-and-invoicing/invoicing-tutorials/enable-proforma-invoicing/Steps through enabling Tax Support and Proforma Invoicing/Sequential Paid Invoice Numbering in Tax Configuration’s VAT Settings, setting the Sequential Invoice Number Format, Next Paid Invoice Number, and Auto Reset Numbering, then enabling Enable Proforma Invoicing in the General Settings Invoices tab.https://docs.whmcs.com/9-1/system/general-settings/general-settings-invoices/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/system/general-settings/general-settings-invoices/Documents Continuous Invoice Generation, Metric Usage Invoicing, PDF Invoices/Paper Size/Font Family, Store Client Data Snapshot, Mass Payment, Clients Choose Gateway (including its effect on API-driven invoice gateway changes), Group Similar Line Items, Cancellation Request Handling, Automatic Subscription Management, Proforma Invoicing, Sequential Paid Invoice Numbering, invoice/credit/debit note number incrementation, late fee type and amount, and accepted credit card types. Also documents the Invoice Immutability compliance selector, its three states (full compliance, immutability disabled with credit and debit notes, and immutability and credit and debit note generation disabled), and the confirmation window that gates the disabled states.