KudTax Blog
VAT in e-Commerce: What Online Sellers Need to Know
The VAT obligations online sellers face, how the One-Stop-Shop system works, and what to watch when using Amazon FBA and storing goods across the EU.
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Etsy and Lexware Office: prepare your CSV export
Prepare Etsy records for Lexware Office: choose the right CSV, reconcile fees and payouts, and understand the limits of importing journal entries.
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Choosing e-commerce accounting software: 7 practical checks
Compare data coverage, payment reconciliation, DATEV exports and costs. Use a complete test month to choose accounting software for your online business.
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Which Business Structure is Ideal for Your Online Shop?
Sole proprietorship, UG or GmbH for your online shop? The differences in liability, taxes and setup costs – and when each form actually makes sense.
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Amazon FBA and FBM: bookkeeping, fees and reconciliation
Reconcile Amazon FBA and FBM: settlements, fees, own shipping, refunds and the DATEV handover. Includes a cash-flow example for both fulfilment models.
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DAC7 in Practice: What Platforms Report About Their Sellers
DAC7 obliges digital platforms to report sellers to tax authorities. The rules, data fields, deadlines, due diligence and the XML reporting process.
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Payment Provider Accounting: PayPal, Stripe, Klarna and Mollie
Reconciling PayPal, Stripe, Klarna, Mollie and Shopify Payments: payouts, fees, refunds, chargebacks, reserves, open items and DATEV-ready data.
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Bookkeeping for Online Sellers: The Guide to Automating It
Why e-commerce bookkeeping differs from classic bookkeeping – and how the five steps from document to locked month-end close can be automated.
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Avoiding Accounting Mistakes: The 5 Most Common in Online Retail
Five mistakes in almost every e-commerce set of books – from archiving that fails GoBD to Amazon stock movements nobody noticed, and how to close each.
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ViDA: E-Invoicing, Digital Reporting and Single VAT Registration
The EU adopted VAT in the Digital Age in March 2025. The three pillars, the binding timeline through 2035 and the obligations that follow for businesses.
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AI-Powered Matching in E-Commerce Accounting
How orders, invoices, payments, fees and payouts get connected automatically – using exact IDs, rules, confidence scores and human review.
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Bundling E-Commerce Transactions into Summary Entries
Thousands of orders need not become thousands of export entries: consolidate by period, account and marketplace while every transaction stays traceable.
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DATEV Import Failed? The 7 Most Common EXTF Errors and How to Fix Them
“The file won't import.” Almost every time one of the same seven structural errors is to blame – a broken header, the wrong date format, the Excel trap.
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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 in. 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. The two core VAT formulas, the difference between 19% and 7%, and the calculation errors people actually make.
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Validating VAT IDs: Why Reverse Charge Without Verification Is Risky
A zero-rated B2B invoice to the EU needs a valid customer VAT ID, and the burden of proof is yours. When reverse charge applies and what counts as proof.
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The True Cost of Manual Accounting: The Hours Nobody Books
Two minutes per document sounds harmless – at 2,000 orders a month it is more than 66 working hours. What DIY bookkeeping actually costs.
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One Price, 27 VAT Rates: How OSS Sales Reshape Your Margin
Same gross price, different margin: destination VAT runs from 17% to 27%. What that costs you per country and which pricing strategies actually work.
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Amazon Settlement Report Explained: Why Payouts Don't Match Sales
Why an Amazon payout never matches sales: settlement reports, fees, refunds, deferred transactions, reserves and the DATEV reconciliation workflow.
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DATEV Export for Online Retailers: Journal Entries and Import Errors
What a DATEV export from Amazon, Shopify and payment providers must contain: posting batches, document links, open items and the usual import errors.
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OSS vs IOSS 2026: €10,000 Threshold, €150 Limit & Mistakes
OSS or IOSS? The differences, the EU-wide €10,000 threshold, the €150 IOSS limit, filing deadlines, marketplace cases and the new customs rules.
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How to Account for Returns, Chargebacks and Gift Cards in E-Commerce
Returns, refunds, chargebacks, gift cards and discounts for online retailers: VAT, supporting documents, payment reconciliation and DATEV-ready workflows.
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E-Commerce Accounting for Tax Firms: High-Volume Transaction Data
Processing Amazon, Shopify and payment data at scale: a standardised workflow for subledgers, open items, controls, GoBD compliance and DATEV handovers.
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Amazon Vendor Central Accounting: Credit Notes, Co-op and Allowances
Vendor invoices, credit notes, co-op fees, allowances and shortage claims: the full reconciliation from purchase order to DATEV-ready payout.
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E-Commerce Balance Sheet 2026: What Tax Advisers Must Review
Inventory at Amazon FBA and 3PL providers, payment-provider balances, returns, vouchers, OSS and foreign currencies: the year-end issues that matter.
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Shopify Payout Reconciliation: Payments, PayPal & Klarna (2026)
Reconcile Shopify Payments, PayPal, Klarna, fees, refunds and payouts, then hand clean, traceable booking data to DATEV.
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E-invoicing 2026: XRechnung & ZUGFeRD in e-commerce
Receiving is mandatory since 2025, issuing follows from 2027: what separates XRechnung from ZUGFeRD, which B2B deadlines apply, and how to handle both.
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GoBD Festschreibung: what the monthly close really means
Once finalized, bookings are immutable – corrections only via reversal. What the monthly close requires and what a clean export-and-lock process looks like.
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