Invoicing guides

Short, practical answers to the rules behind each invoice. Each guide links to a free generator or calculator.

• GST invoice format: every mandatory field, explainedWhat a GST tax invoice must contain under Rule 46: GSTIN, invoice number rules, HSN/SAC, place of supply, tax split, signature and copies.
• CGST + SGST or IGST: which one applies to your invoice?Same state means CGST + SGST, different states means IGST. How place of supply decides it, worked examples at 18%, and what happens on exports.
• Tax invoice requirements in AustraliaWhat an ATO tax invoice must show: 'tax invoice', ABN, date, description, GST, and buyer details from $1,000. Plus the $82.50 and 28-day rules.
• What a UK VAT invoice must includeThe fields HMRC requires on a full VAT invoice, when a simplified invoice is allowed (up to £250), reverse charge wording and the 30-day rule.
• Commercial invoice vs proforma invoiceA proforma invoice is a preliminary quote; a commercial invoice is the final sale and customs document. Comparison and when to use each.
• How to fill out a commercial invoice for exportField-by-field guide to a commercial invoice: exporter, consignee, HS codes, country of origin, Incoterms 2020, values, weights and declaration.
• Rent receipts for HRA: format and rulesWhat a rent receipt for an HRA claim must show, when the landlord's PAN is required, when a revenue stamp is needed, and how HRA exemption is calculated.
• Bill of supply vs tax invoiceComposition dealers and exempt suppliers issue a bill of supply with no GST; regular suppliers issue a tax invoice. Differences and required wording.
• How to make an invoice, step by stepWhat to put on an invoice and in what order: your details, customer, number, dates, items, tax, total and payment terms. Free templates for GST, VAT and more.
• Invoice vs receipt: what's the difference?An invoice asks for payment; a receipt confirms payment was made. Side-by-side comparison, what each must show, and when you need both.
• How to number invoices correctlyInvoice numbers must be unique and usually sequential; India's GST caps them at 16 characters per financial year. Formats, examples and fixing mistakes.
• Credit note vs debit noteA credit note reduces what a customer owes (returns, discounts, overcharges); a debit note increases it (undercharges). When to issue each, with GST examples.
• HSN and SAC codes on GST invoicesHSN codes classify goods and SAC codes classify services on GST invoices. How many digits to show for your turnover, where to find codes and common examples.
• E-invoicing in India: IRN and QR code explainedWho must generate e-invoices under GST, how the IRN and QR code work, the reporting time limit and what stays the same for small businesses.
• Incoterms 2020 explainedAll 11 Incoterms 2020 rules in one table: who pays freight, insurance and import duty, where risk passes, and which to use for sea, air and courier.
• Can you invoice without an ABN?If an Australian supplier doesn't quote an ABN, the payer may have to withhold 47%. When that applies, the exceptions, and how to check an ABN before invoicing.

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