FastBill Alternative: When Does VAT GPT Fit Better?
Looking for a FastBill alternative because you sell on Amazon and eBay and need marketplace taxes besides invoices? Per its own site, FastBill is invoicing and bookkeeping software for freelancers, small businesses and small firms. VAT GPT is our product. As of 29 October 2026.
Last updated: 29 October 2026. All statements about FastBill come from fastbill.com, retrieved on 29 October 2026; this is no rating of FastBill.
In short
- FastBill: invoices, receipts and banking; plans from 10 € (9 € billed annually) to 59 € and up a month net.
- VAT GPT: tax software in the browser; reads marketplace reports, prepares the VAT return, EÜR and OSS return.
- Decision: everyday invoices and receipts, or tax returns from Amazon and eBay data.
What does FastBill offer per its own site?
fastbill.com states, among other things (FastBill):
- Audience: "Freelancer, Kleinunternehmer, Consultants, Agenturen, Handwerksbetriebe, UGs und GmbH".
- Job: "bringt Ordnung in deine Rechnungen, Belege und Banking." (brings order to invoices, receipts and banking)
- Taxes: a "Umsatzsteuervoranmeldung" described as automated and needing no ELSTER certificate.
- Interfaces: "DATEV-Schnittstelle" and an "Amazon Rechnung" solution.
- Not mentioned: eBay and OSS do not appear on the retrieved pages.
What this means for you: FastBill fits ongoing invoices and receipts; whether it covers your OSS sales, ask FastBill.
What does FastBill cost?
Prices per month, net, as of 29 Oct 2026 (FastBill: pricing):
| Plan | Monthly billing | Annual billing |
|---|---|---|
| Solo | 10 € | 9 € |
| Plus | 15 € | 14 € |
| Pro | 30 € | 27 € |
| Premium | from 59 € | from 53 € |
| VAT GPT Pro | 49 € incl. VAT | 444 € a year incl. VAT |
Per the page: "Alle Preise verstehen sich als Nettopreise zuzüglich der gesetzlichen Mehrwertsteuer." (all prices net plus VAT). The VAT return is listed in Solo; receipt import is an add-on from 9 € a month.
What this means for you: Compare net with gross: VAT GPT's 49 € includes VAT, FastBill's prices do not.
Who fits FastBill, who fits VAT GPT?
FastBill fits if you want to write invoices continuously, collect receipts and match payments.
VAT GPT fits if you have Amazon and eBay reports, are established only in Germany and your distance sales to other EU countries (together with certain electronic services) exceed 10,000 euros net (previous or current year): the VAT of the destination country then applies (§ 3c Abs. 4 UStG), and OSS is an optional procedure for reporting it centrally (§ 18j UStG; BZSt: One-Stop-Shop).
What this means for you: Without marketplace sales abroad, an invoicing tool is often enough.
How VAT GPT helps
- Upload: Amazon and eBay reports and invoices; the AI reads amounts, countries and tax rates.
- Check: you review and confirm the values.
- Send: with Pro through ELSTER to the tax office, the OSS return to the BZSt.
Not included: no tax advice and no invoicing for your customers. There are Free, Go and Pro (49 € a month or 444 € a year, incl. VAT). Try it for free
FAQ
What is a FastBill alternative for Amazon and eBay sellers? VAT GPT prepares the VAT return, EÜR and OSS return from marketplace reports; it is our own product, not a test.
What does FastBill cost? Per fastbill.com from 10 € (9 € billed annually) to 59 € and up a month net plus VAT.
Does FastBill support the OSS return? The retrieved pages do not mention OSS; ask FastBill directly.
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No tax advice: the content does not replace individual advice.