Amainvoice or VAT GPT? The comparison for Amazon sellers

Both work with Amazon data, on different tasks. Amainvoice calls itself accounting software for Amazon sellers and, by its own account, automates the steps from data capture to the DATEV export. VAT GPT imports Amazon and eBay reports, calculates VAT and, with Pro, sends advance VAT returns and other returns via ELSTER, plus the OSS return to the BZSt.

Only VAT GPT sends all three returns itself. Of the tools we compare, according to the providers' own pages (checked 3 November 2026), only VAT GPT submits the OSS return itself to the BZSt, plus the VAT advance return and the annual VAT return via ELSTER to the tax office, calculated from your Amazon and eBay reports. You do not have to go into Mein ELSTER or the BZStOnline portal yourself. With the others, you upload the OSS file in the BZStOnline portal yourself, or a tax adviser or the provider's service files it for you. Sending needs Pro. OSS software compared

Last updated: 29 October 2026

In short

Amainvoice: According to amainvoice.de, connection to Seller Central via API, no CSV exports, posting batches with SKR03/SKR04 and DATEV export.
Prices: Amainvoice bills per document according to amainvoice.de, VAT GPT per plan; the models are not directly comparable.
Decision: It depends on who does your bookkeeping and who sends the returns.

What Amainvoice can do, according to Amainvoice

Target group: “Amainvoice is 100% tailored to Amazon sellers”.
Connection: Connect the Amazon account to Seller Central via API, “no CSV exports”.
Bookkeeping: Posting batches with charts of accounts such as SKR03 and SKR04 and export to accounting systems such as DATEV; exports for working with the tax adviser.
EU VAT: PAN-EU, CEE, OSS and Intrastat, VAT ID number checks and VAT sales lists per country.
OSS: Amainvoice “calculates the VAT for the correct OSS return” and creates reporting lists for the tax authorities.

What this means for you: Read the list as Amainvoice's own description, and check it on its site.

What VAT GPT can do

Marketplace reports: Import Amazon and eBay CSV reports and break down the VAT for Germany and the EU (OSS).
Returns: Prepare the advance VAT return (monthly or quarterly) and the annual VAT return and send them via ELSTER with Pro; EÜR (income surplus statement), trade tax and income tax likewise.
OSS: Calculate the OSS return for all EU countries and send it to the BZSt with Pro.
Receipts: Upload invoices, the AI reads amounts, countries and tax rates – you check and confirm.

Amainvoice and VAT GPT side by side

	Amainvoice (according to amainvoice.de)	VAT GPT
Target group	Amazon sellers	Online sellers on Amazon and eBay, self-employed people and small businesses
Data from Amazon	via API with Seller Central, no CSV exports	import Amazon and eBay CSV reports
OSS	calculates the VAT for the OSS return, creates reporting lists	calculate the OSS return and send it directly to the BZSt with Pro
Price	flat €43 per month up to 200 documents, above that €0.24 per document (201 to 1,000 documents, at most €153 per month) and further tiers; the page gives no VAT note; valid from 9 February 2026	Free; Go 30 days free with all Pro features; Pro
Pricing basis	Documents = sum of invoices and cancellation invoices	fixed price per plan

Sources: amainvoice.de (German-language pages; quotes are our translations; retrieved on 19 October 2026) and VAT GPT. The sources are listed at the bottom of this page. The pricing models are not directly comparable: Amainvoice bills by documents, VAT GPT by plan.

When Amainvoice fits

You sell via Amazon FBA and need the EU rules for PAN-EU, CEE, Intrastat and sales lists per country that Amainvoice describes on its site.
You want ongoing Amazon bookkeeping with posting batches and a DATEV export for your tax firm.
You want to obtain the Amazon data via API rather than via CSV report.

What this means for you: Choose Amainvoice if these points describe your situation.

When VAT GPT fits

You want to send the advance VAT return, EÜR, trade tax and income tax yourself via ELSTER with VAT GPT Pro and the OSS return yourself to the BZSt.
You also sell on eBay and have the reports as CSV.
You want a fixed price per plan instead of billing by documents.

How VAT GPT helps you with this

If your figures come from Amazon or eBay reports, it works like this in VAT GPT:

Upload files: your Amazon or eBay CSV report and your invoices. The AI reads amounts, countries and tax rates.
Check the result: VAT GPT breaks down the VAT for Germany and the EU (OSS) and prepares the advance return and the OSS return. You check and confirm.
Send: with VAT GPT Pro – via ELSTER to the tax office, the OSS return directly to the BZSt.

Everything is in one place:

advance VAT return
annual VAT return
OSS return
EÜR
trade tax return
income tax return

There are Free (basic features, free of charge), Go (30 days free with all Pro features) and Pro. Try for Free Now

Frequently asked questions

What does Amainvoice cost? According to amainvoice.de, a flat €43 per month up to 200 documents, above that tiered by documents; the page gives no VAT note.

What counts as a document at Amainvoice? The sum of invoices and cancellation invoices.

How does Amainvoice get my Amazon data? Via an API connection to Seller Central, without CSV exports.

How does VAT GPT get my Amazon data? You import the Amazon or eBay CSV report.

Do I have to choose between the two? That depends on who does the bookkeeping for you and who sends the returns. Whether the two programs exchange data with each other, we have not checked.

Does VAT GPT send my returns itself? Yes, with Pro: advance VAT return, EÜR, trade tax and income tax via ELSTER, the OSS return to the BZSt.