InvoiceGen Blog
Guides, tips, and best practices for invoicing, billing, and getting paid on time. Written for freelancers and small business owners.
How to Create a Professional Invoice: A Complete Guide
Step-by-step guide to creating professional invoices that get you paid faster. Covers layout, essential fields, and best practices.
Invoice vs Receipt vs Quote: What's the Difference?
Understand the key differences between invoices, receipts, and quotes, and when to use each document in your business.
Invoice Payment Terms Explained: Net 30, Net 60, EOM & More
Master payment terms like Net 30, 2/10 Net 30, and due on receipt. Learn how to set terms that improve your cash flow.
10 Invoicing Mistakes That Delay Payment (and Quick Fixes)
Avoid costly errors that delay payments. From missing details to unclear terms, here are the top invoicing mistakes and their fixes.
How to Invoice as a Freelancer: Rates, Taxes & Getting Paid
Everything freelancers need to know about invoicing clients, from setting rates to chasing late payments professionally.
How to Generate Invoice from Amazon: The Complete 2026 Guide
Learn how to generate invoice from Amazon as a buyer or seller. Step-by-step instructions for desktop, mobile, third-party orders, and VAT invoices.
How to Auto Generate Invoice in Excel: 4 Methods from Simple to Fully Automated
Learn how to auto generate invoice in Excel using templates, formulas, VLOOKUP, and VBA macros. Step-by-step tutorials with code you can copy.
How to Generate a PayPal Invoice: Complete 2026 Step-by-Step Guide
Learn how to generate a PayPal invoice on desktop and mobile. Step-by-step tutorial, fee breakdown, recurring invoices, and a fee-free alternative.
How to Generate an Invoice Number: Formats, Examples & Best Practices (2026)
Learn how to generate an invoice number that's unique, professional, and audit-proof. 5 proven formats with examples and common mistakes to avoid.
What Is an Invoice? Definition, Purpose & How They Work
A plain-English definition of an invoice: its purpose, the key parts, the main types of invoices, and how an invoice differs from a bill or a receipt.
What to Include on an Invoice: The 9 Essential Elements
The required and recommended fields every professional invoice needs to be valid and get paid — plus what makes an invoice legally sound.
What Is a Proforma Invoice? Meaning, Uses & Examples
What a proforma invoice is, when to use one, and how it differs from a quote, a commercial invoice, and a final invoice — with examples.
What Is a Tax Invoice? GST & VAT Requirements Explained
How a tax invoice differs from a regular invoice, the fields that make a GST/VAT tax invoice valid, and who has to issue one.
What Is a Commercial Invoice? A Guide for Shipping & Customs
What a commercial invoice is used for in international shipping and customs, what to include, and how it differs from a proforma invoice.
What Is a Credit Note? When and How to Issue One
How credit notes work, when to issue one instead of editing an invoice, and how a credit note differs from a debit note and an invoice.
Purchase Order vs Invoice: Key Differences Explained
Who creates a purchase order vs an invoice, which comes first, and how POs, invoices, and receipts work together in the buying process.
How to Invoice a Client: A Step-by-Step Guide for Your First Bill
The end-to-end workflow for invoicing a client — agreeing terms, sending the invoice, what to say, and following up to get paid.
How to Send an Invoice by Email (With Templates & Wording)
What to write when emailing an invoice, subject-line tips, and copy-paste templates for the first send, reminders, and thank-you notes.
Can You Invoice Without a Company? (Individuals & Sole Traders)
Yes — how individuals, sole traders, and the self-employed legally invoice clients without a registered company, and the tax basics to know.
How to Charge Late Fees on Invoices (Legally + Wording)
How much you can charge, how to calculate late-payment interest, the exact late-fee wording for an invoice, and the rules to know.
How to Chase Unpaid & Overdue Invoices (Email Templates + Steps)
A calm escalation timeline plus copy-paste reminder email templates for chasing overdue invoices — and what to do when a client won't pay.
How to Invoice for a Deposit or Upfront Payment
When to take a deposit, how to write a deposit invoice, and how to apply it to the final invoice — with a clear worked example.
Recurring Invoices & Retainers: How to Bill Repeat Clients
What a recurring invoice is, how retainers differ, and how to keep monthly billing for repeat clients consistent and on time.
How to Invoice for Expenses, Reimbursements & Mileage
Billable vs reimbursable costs, whether to mark up expenses, and how to list travel, materials, and mileage on a client invoice.
How to Invoice International Clients (Currency, Tax & Getting Paid)
Which currency to bill in, exchange-rate and tax considerations, what to include on an international invoice, and how to get paid faster.
Are Invoices Legally Binding? Invoices, Contracts & the Law
How an invoice relates to a contract, whether it's a legal document, what makes it enforceable, and your options for unpaid invoices.
How Long Should You Keep Invoices? Record-Keeping Rules
Typical invoice and receipt retention periods by country, why record-keeping matters for tax and audits, and how to store them safely.