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Invoicing & Receipt Guides

Plain-English guides to writing invoices and receipts, setting payment terms, numbering, and getting paid on time.

Invoicing guides

How to Write an InvoiceLearn how to write an invoice step by step: required fields, numbering, line items, payment terms, and common mistakes to avoid. Free guide from FreeSlip. Invoice TemplateOur free invoice template guide covers every field your template needs, service vs. product layouts, and why an online generator beats a static Word template. Invoice NumberingInvoice numbering explained: sequential vs. coded systems, real examples (INV-2026-001), handling voided invoices, and what auditors expect. FreeSlip guide. Payment TermsInvoice payment terms explained: Net 30, Net 15, due on receipt, 2/10 net 30 discounts, late fees, and how terms affect your cash flow. FreeSlip guide. What Is an Invoice?What is an invoice? Plain-English definition, invoice vs. bill vs. receipt, the main types (standard, proforma, recurring), and why invoices matter for taxes. Contractor InvoicesHow to write a contractor invoice that gets paid: progress billing, line items for labor and materials, change orders, and retainage explained. Freelancer InvoicesFreelancer invoice guide: hourly vs. project billing, what to include, payment terms that protect you, and a late-payment follow-up sequence that works. Proforma InvoicesWhat is a proforma invoice? Learn when to use one, how it differs from a commercial invoice, and what fields it needs — with a clear example. Past-Due InvoicesPast-due invoice? Follow this 7/14/30/60-day reminder timeline with exact wording for each nudge, plus how to set late fees the professional way. Small Business InvoicingSmall business invoicing made simple: workflows, invoice numbering, payment terms, tracking unpaid invoices, and tax records — the complete guide. Invoice vs ReceiptInvoice vs receipt: the key differences explained — purpose, timing, and when to issue each — plus the full quote-to-payment lifecycle. Free tools.

Receipt guides

How to Write a ReceiptLearn how to write a receipt: the required fields, a simple numbering system, paper vs digital options, and mistakes to avoid. Free tool included. Rent ReceiptsLandlord's guide to rent receipts: why to issue them, what every rent receipt must include, how often, and record-keeping tips. Free rent receipt maker. Cash ReceiptsHow to write a cash receipt that holds up: required fields, payer acknowledgment, storage tips, and using cash receipts at tax time. Free tool. What Is a Receipt?What is a receipt? A plain-English definition, the types of receipts, how receipts differ from invoices, and why they matter for returns and taxes. Invoice vs ReceiptInvoice vs receipt: the key differences explained — purpose, timing, and when to issue each — plus the full quote-to-payment lifecycle. Free tools.