Invoice Generator

Create professional invoices from text descriptions or structured data.

Workflow

1. Collect invoice details from the user (or parse from prompt):
• Sender (business name, address, email)
• Recipient (client name, address, email)
• Line items (description, quantity, unit price)
• Invoice number, date, due date
• Payment terms/methods
• Tax rate (optional)
• Notes (optional)
2. Read the template at assets/invoice-template.html
3. Replace placeholders with actual data, calculate totals
4. Save as .html file — user can open in browser and Print → PDF

Calculations

• Subtotal = sum of (quantity × unit price) for each line item
• Tax = subtotal × tax rate
• Total = subtotal + tax
• Always format currency with 2 decimal places

Template Placeholders

Defaults

• Currency: USD (configurable)
• Tax: 0% unless specified
• Due date: 30 days from invoice date unless specified
• Invoice number: auto-increment or user-specified

Common Mistakes to Avoid

• Don't guess line items — if the user is vague ("invoice them for the work"), ask for specifics (hours, rate, deliverables)
• Don't invent sender details — use what the user provides or ask
• Don't skip the math — always verify subtotal + tax = total. Rounding errors on invoices are unprofessional
• Don't add fake payment links — only include payment methods the user explicitly provides