Learning Center
Practical guides on invoicing, payments, taxes, and cash flow — written for real businesses, not textbooks.
Invoicing ›
Invoice vs Receipt: What's the Difference?
Invoices request payment; receipts confirm it. Learn when to send each, what they must include, and why the difference matters for your books.
Read guide ›Invoice vs Estimate: When to Send Each
An estimate prices the work; an invoice bills for it. Learn when to send each and how to convert one into the other smoothly.
Read guide ›What Is a Proforma Invoice?
A proforma invoice is a preliminary bill sent before final delivery. Learn when businesses use it, what it includes, and how it differs from a real invoice.
Read guide ›What Is a Recurring Invoice?
A recurring invoice bills the same client the same amount on a schedule. Learn when to use them, how they work, and how to set one up.
Read guide ›How to Create a Professional Invoice
What separates a professional invoice from a messy one — layout, clarity, branding, and the details that make clients pay faster.
Read guide ›How to Write an Invoice
What to actually write on an invoice: the fields, the line items, the payment terms, and the notes that make clients pay without questions.
Read guide ›What Should an Invoice Include? (Checklist)
The complete checklist of everything a professional invoice needs: business details, line items, totals, tax, payment terms, and the small print that prevents disputes.
Read guide ›What Is a Commercial Invoice?
A commercial invoice is the customs document for international shipments. Learn what it must include — value, HS codes, origin — and how it differs from a regular invoice.
Read guide ›Invoice vs Quote: What's the Difference?
A quote is a firm price offered before work starts; an invoice requests payment for completed work. Learn when to send each and how they connect.
Read guide ›Payments ›
How to Send an Invoice (and Get It Paid)
How to send an invoice the right way: what to attach, what to write, when to send it, and what to do after. Practical steps for freelancers and small businesses.
Read guide ›How to Follow Up on an Unpaid Invoice
Chasing an unpaid invoice doesn't have to be awkward. Use these friendly-to-firm follow-up templates and a timeline that actually gets you paid.
Read guide ›How to Track Unpaid Invoices
Track unpaid invoices without a spreadsheet meltdown: one status per invoice, a weekly review, and a follow-up list that never gets stale.
Read guide ›What Are Net 30 Payment Terms?
Net 30 means payment is due 30 days after the invoice date. Learn how net terms work, when to use them, and how to protect your cash flow.
Read guide ›Freelancing ›
How to Create an Invoice for Freelance Work
The freelance invoice, step by step: what to include, how to structure hourly and project billing, and what to do after you send it.
Read guide ›How to Invoice a Client (Without It Being Awkward)
Billing clients doesn't have to feel awkward. Learn to invoice confidently, set terms up front, and make payment a natural next step.
Read guide ›Accounting ›
How to Number Invoices (and Why It Matters)
Sequential invoice numbering keeps your books traceable and your clients organized. Learn simple numbering systems and what to avoid.
Read guide ›How to Calculate an Invoice Total
Subtotal, discounts, tax, total due: calculate an invoice correctly every time with this step-by-step method and example.
Read guide ›Taxes ›
How to Calculate VAT on an Invoice
Add VAT to a net amount or strip it from a gross amount — with the formulas, a worked example, and a reminder that rates vary by country.
Read guide ›What Is a Tax Invoice?
A tax invoice is an invoice that includes the tax details your jurisdiction requires — VAT or GST breakdowns, tax IDs, and itemized amounts. Learn what must appear on one.
Read guide ›Cash Flow ›
How Long Should an Invoice Payment Take?
Net-7 to net-30: how to choose payment terms, what's realistic, and how to get paid faster without alienating clients.
Read guide ›How to Reduce Late Invoice Payments
Late payments are usually a systems problem, not a client problem. Fix the invoice, the terms, and the follow-up to get paid on time.
Read guide ›Read it, then do it
Every guide ends with the same next step: a professional invoice.
Create an invoice