KudTax Blog
Bookkeeping for Online Sellers: The Guide to Automating It
Why e-commerce bookkeeping works differently from classic bookkeeping — and how the five steps from document to locked month-end close can be automated. Including the points where automation stops and a human has to decide.
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Avoiding Accounting Mistakes: The 5 Most Common in Online Retail
Five mistakes that show up in almost every e-commerce set of books — from archiving that fails GoBD to Amazon stock movements nobody noticed. How to spot each one, what it costs if it surfaces in an audit, and how to close it.
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Amazon FBA & Multi‑Marketplace Accounting 2025: The Complete Guide for Online Sellers
Payout streams, fee labyrinths, OSS VAT and e‑invoicing: how online sellers can bring their accounting for Amazon FBA, Shopify & more into shape in 2025 – automated, GoBD‑compliant and with clean invoice management.
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ViDA 2025 explained: e-invoicing, Digital Reporting & Single VAT Registration — what changes now and what’s coming by 2035
The EU’s VAT in the Digital Age (ViDA) was adopted on 11 March 2025. This explainer covers the three pillars — e-invoicing/DRR, platform rules and Single VAT Registration — the binding timeline through 2035, and the key obligations for businesses.
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AI-Powered E-Commerce Accounting: How Invoices, Payments and Transactions Are Matched Automatically
How does AI-powered matching work in e-commerce accounting? This practical guide explains how orders, invoices, payments, fees, refunds and payouts are connected using exact IDs, rules, confidence scores and human controls.
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Bundling E-Commerce Transactions: Consolidate Orders into Summary Accounting Entries by Period, Account and Marketplace
Thousands of orders do not have to create thousands of hard-to-review export entries. This guide explains how compatible e-commerce sales can be consolidated by period, accounts, platform and marketplace while every underlying transaction remains traceable.
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DATEV Import Failed? The 7 Most Common EXTF Errors and How to Fix Them
Your tax advisor writes back: “The file won’t import.” Almost every time, one of the same seven structural errors is to blame – from a broken header to the wrong date format to the Excel trap. This guide shows how to spot each one, fix it, and prevent it for good.
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Understanding Amazon Fees: Where Your Margin Actually Goes
A 15% referral fee sounds manageable – until fulfilment fees, cost of goods, and VAT join the party. This guide dissects an Amazon sale line by line, debunks the most common margin miscalculations, and shows how to work out your true contribution margin per unit.
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Gross, Net, 19% or 7%: How to Calculate VAT Correctly
€119 gross does not become €100.04 net – even if your calculator says so. This guide covers the two core VAT formulas, the difference between Germany’s 19% and 7% rates, the most common day-to-day calculation errors, and what all of it means for your pricing.
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Validating VAT IDs: Why Reverse Charge Without Verification Is Risky
A zero-rated B2B invoice to another EU country requires a valid customer VAT ID – and the burden of proof sits with you. This guide explains when reverse charge applies, what a qualified confirmation is, how to build validation into your invoicing process, and which mistakes get genuinely expensive.
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The True Cost of Manual Accounting: The Hours Nobody Books
DIY bookkeeping feels free – until you count the hours. Two minutes per document sounds harmless, but at 2,000 orders a month it becomes more than 66 working hours. This article makes the hidden costs visible: time, error consequences, tax advisor queries, and the opportunity cost of growth.
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One Price, 27 VAT Rates: How OSS Sales Reshape Your Margin
Sell EU-wide at a uniform gross price and you will not earn the same everywhere: the destination country’s VAT is extracted from the very same price – from 17% in Luxembourg to 27% in Hungary. This article explains the mechanism, the €10,000 threshold, your pricing options, and how to quantify the effect per country.
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Amazon Settlement Reports Explained: Payouts, Fees, Refunds and Reserves
Why does an Amazon payout not match sales? This 2026 guide explains Amazon Settlement Reports, fees, refunds, deferred transactions, account-level reserves and the correct reconciliation workflow for DATEV.
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E-Commerce Payment Accounting: PayPal, Stripe, Klarna, Mollie and Shopify Payments
A practical guide for merchants and accountants on reconciling PayPal, Stripe, Klarna, Mollie and Shopify Payments: payouts, fees, refunds, chargebacks, reserves, open items and DATEV-ready accounting data.
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DATEV Export for Online Retailers: Journal Entries, Document Links, Open Items and Import Errors
What should a DATEV export from Amazon, Shopify and payment providers actually contain? This guide explains posting batches, document links, open-item accounting, required fields and common DATEV import errors for online retailers and tax firms.
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OSS and IOSS 2026: Differences, VAT Thresholds and Common E-Commerce Mistakes
OSS or IOSS? This practical guide explains the differences, the EU-wide €10,000 threshold, the €150 IOSS limit, filing deadlines, marketplace scenarios and common VAT mistakes in e-commerce, including the new EU customs rules effective from July 2026.
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How to Account for Returns, Chargebacks, Gift Cards and Discounts in E-Commerce
How should online retailers account for returns, refunds, chargebacks, gift cards, store credit and discounts? This practical guide explains VAT, supporting documents, payment reconciliation and DATEV-ready workflows with worked examples.
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E-Commerce Accounting for Tax Firms: Automating High-Volume Transaction Data
How can German tax firms process Amazon, Shopify, marketplace and payment data at scale? This practical guide presents a standardised workflow for high-volume data, subledgers, open items, controls, GoBD compliance and DATEV handovers.
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Amazon Vendor Central Accounting: Credit Notes, Co-op Fees, Allowances and Payouts
How should Amazon Vendor invoices, credit notes, co-op fees, allowances, shortage claims and remittances be accounted for? This practical guide explains the full Vendor Central reconciliation from purchase order to DATEV-ready payout allocation.
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E-Commerce Balance Sheet 2026: What Tax Advisers Need to Review for Online Retailers
Inventory held by Amazon FBA and 3PL providers, payment-provider balances, returns, vouchers, OSS, foreign currencies and marketplace fees: this guide explains the key year-end issues for e-commerce tax advisers.
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Shopify Accounting 2026: How to Reconcile Shopify Payments, PayPal, Klarna and DATEV
A practical guide to Shopify accounting in 2026: reconcile Shopify Payments, PayPal, Klarna, fees, refunds and payouts, then create clean, traceable booking data for DATEV.
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E-invoicing 2026: XRechnung & ZUGFeRD in e-commerce
Since 2025 every German business must be able to receive e-invoices — and from 2027 issuing them becomes mandatory in stages. What separates XRechnung from ZUGFeRD, which B2B deadlines actually apply, and how online sellers import and generate structured invoices without friction.
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GoBD Festschreibung: what the monthly close really means
German GoBD rules require bookings to become immutable once finalized — no erasing, corrections only via reversal entries. What's behind the monthly close, why a combined DATEV booking batch helps, and what a clean 'export & lock' process looks like in practice.
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DAC7 in practice (2025): What platforms report — and how online sellers are affected
The EU’s DAC7 directive obliges digital platforms to report their sellers to tax authorities. This article explains the rules, data fields, deadlines, due diligence and XML reporting process under national laws such as Germany’s PStTG.
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VAT in e-Commerce: What Online Sellers Need to Know
This blog explains the VAT obligations for online sellers, how the One-Stop-Shop (OSS) system works, what to consider when using Amazon FBA and storing goods across the EU – and how KudTax helps you automate your e-commerce bookkeeping in a compliant and efficient way.
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Which Business Structure is Ideal for Your Online Shop?
Thinking about starting an online shop and wondering whether to go with a sole proprietorship, UG, or GmbH? In this blog, we compare the most common business structures for e-commerce in Germany, including legal, tax, and strategic factors – so you can make the right decision from day one.
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