skills-only

BillFast

Notes in. Invoice out.

Paste notes, hours, or a timesheet into ChatGPT. BillFast turns them into a clean, tax-ready invoice — exact totals, VAT per rate, English or German.

Try saying Support

Submit skills-only now. Directory link added after approval.

Why it exists

From messy notes to line itemsWorkshop prep 4h, workshop 6h becomes a proper table.
Asks, never guessesMissing rate, tax number, or IBAN? One checklist. No made-up numbers.
Exact mathNet, VAT per rate, discounts, total — to the cent.
English or GermanInvoice or Rechnung, your choice.
Draft-safeMissing fields stay as visible [PLACEHOLDER] on a DRAFT.

How it works

Paste notes, hours, or upload a timesheet CSV.
Confirm the draft table and totals.
Download the invoice (PDF where ChatGPT can run code, print-ready otherwise).

Try saying

Create an invoice from these notesTurn this timesheet into an invoice with 19% VATGenerate an invoice PDF for this clientRechnung auf Deutsch mit 19 % MwSt

Example

Acme GmbH · 12 h × €110 · 19 % VAT · due in 14 days
Net €1,320.00 · VAT €250.80 · Total €1,570.80

Good to know

PDF file only where ChatGPT can run code; otherwise print-ready invoice in chat.
No memory across chats — client defaults aren't saved between conversations.
Does not send invoices, take payments, or connect to accounting/banking tools.
Human-readable invoice, not XRechnung/ZUGFeRD e-invoice.
Not tax advice — does not choose your VAT rate or tax status.

Free. Runs inside ChatGPT for the skills-only package. See Privacy · Terms · Support.