Invoice Generator Skill

An invoice that's clear and complete gets paid faster — it has the details a client (and their finance team) need to approve and pay without a back-and-forth. This skill produces a professional invoice with everything in the right place: itemised work, the totals, and how and when to pay.

> Note: this is a documentation aid, not tax, accounting, or legal advice. Tax handling (VAT/GST/sales > tax, reverse charge, withholding), required fields, and registration numbers vary by country and situation — > confirm your tax treatment and legal requirements with an accountant. Tax lines below are flagged to set.

Working from a brief

Given "invoice a client $2,000 for a website project", produce the full invoice anyway — lay out every standard field and mark the ones to set (your detail) (invoice number, dates, tax rate, payment details). Compute the arithmetic from the line items you're given; don't invent a tax rate — flag it to set.

Required Inputs

Ask for these only if they aren't already provided (else mark to set):

• From / to — your business name + contact (and tax/registration ID if applicable), and the client's billing details.
• Line items — description of work/goods, quantity, unit rate.
• Tax — whether tax applies and the rate (flag to confirm), or exempt/not applicable.
• Terms — payment due (e.g. Net 30), accepted methods (bank transfer, card, etc.), and any late-payment terms.
• References — PO number, project name, invoice number (or note your numbering scheme).

Output Format

Invoice

• Header — "INVOICE", a unique invoice number, issue date, and due date.
• From — your business name, address, contact, tax/registration ID (if any).
• Bill to — client name, address, contact; PO/reference if provided.
• Line items — a table: description · qty · unit rate · amount.

| Description | Qty | Rate | Amount | |---|---|---|---|

• Totals — subtotal, tax (rate + amount, flag to set), discounts if any, and total due (in the right currency). Show the arithmetic so it's verifiable.
• Payment details — how to pay (bank/account details, payment link, etc.) and the terms (due date, late fee if any).
• Notes — a short thank-you / any terms; and a reminder to confirm tax treatment with an accountant.

Quality Checks

• ] Has a unique invoice number, issue date, and explicit due date
• ] Both parties' details are complete (and tax IDs where relevant)
• ] Line items are itemised and the subtotal/tax/total arithmetic is correct and shown
• ] Payment method(s) and terms (e.g. Net 30) are clear
• ] Currency is explicit; tax rate is flagged to set rather than assumed
• ] Reads professionally and is easy for a finance team to approve

Anti-Patterns

• ] Do not invent a tax rate or tax treatment — flag it to confirm with an accountant
• ] Do not omit the invoice number or due date — they're what makes it trackable and payable
• ] Do not leave payment instructions vague — say exactly how to pay
• ] Do not miscompute totals — show the math so it can be checked
• ] Do not present this as tax/legal advice — it formats an invoice, it doesn't certify compliance

Based On

Billing & accounts-receivable practice — complete, itemised invoices with clear terms and payment instructions (tax treatment left to a qualified accountant).