How to write an invoice

A clear invoice tells the client who is billing them, what work was completed, how much is owed, when payment is due, and any payment instructions.

By smpl.stu · Updated

Basic invoice structure

SectionWhat to include
HeaderInvoice label, invoice number, issue date.
FromYour name or business name and contact details.
ToClient name and billing details.
WorkLine items for services or deliverables.
TotalsSubtotal, tax, discounts, and final amount due.
Payment termsDue date and payment instructions.

Common mistakes

  • Missing due date.
  • Vague line items.
  • Unclear tax handling.
  • No payment instructions.
  • No record of what was sent.

The faster option

smpl.invoices helps freelancers create a structured invoice without rebuilding the same document manually.

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smpl.invoices: Free — Unlimited invoices, saved rates and line items, Canadian sales-tax support, PDF download and owner-confirmed e-Transfer/bank payments. Pro — $8.99 CAD/month or $89.90 CAD/year. See who owes you and send overdue reminders together. Apply disclosed flat or percentage late fees automatically. Recurring invoices, or signed service agreements that charge the client’s saved card each visit. Your logo, card-payment links and branding removal. Each product has its own optional Pro plan.

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