VAT Calculation Service Updates
Starting April 1 2026 Amazon will add a “KSeF Number” column to the VAT Calculation Report for Poland, and from June 1 2026 the VAT Calculation Service will switch to shipment‑level tax calculation across ten EU marketplaces (UK, DE, FR, IT, ES, NL, PL, SE, BE, IE). Sellers must modify SC_VAT_TAX_REPORT queries to include KSeF_Number and change invoicing logic to compute VAT once per shipment.
Overview
Starting April 1 2026 Amazon will add a “KSeF Number” column to the VAT Calculation Report for the Poland marketplace, exposing the invoice identifier generated by Poland’s national e‑invoice system. From June 1 2026 the VAT Calculation Service (VCS) will move from calculating tax on each individual unit to applying VAT once per shipment across ten EU marketplaces. Sellers and developers who rely on VCS for invoice creation or reconciliation must adjust their data pipelines and invoicing logic to stay compliant.
Key Points
- KSeF column appears on April 1 — The VAT Calculation Report for Poland will contain a new field that displays the exact KSeF reference issued by the country’s electronic invoicing platform.
- Shipment‑level tax from June 1 — VAT will be computed on the total net value of a shipment rather than on every line‑item, using the destination country’s rate.
- Ten EU marketplaces affected — United Kingdom, Germany, France, Italy, Spain, Netherlands, Poland, Sweden, Belgium and Ireland will all adopt the shipment‑level approach.
- SC_VAT_TAX_REPORT queries need updating — Any integration that extracts the VAT Calculation Report must be modified to include the new KSeF column, otherwise the data feed will miss a required identifier.
- Invoicing engines must switch formulas — Applications that generate seller invoices should replace per‑unit VAT calculations with a single‑rate computation on the shipment’s net total.
- VAT Invoice Data Report schema unchanged — The format of the VAT Invoice Data Report (VIDR) remains the same, but the tax amounts it contains will reflect the new shipment‑level methodology.
What’s Changing
-
Polish KSeF column addition —
- Amazon will append a “KSeF Number” column to every row of the VAT Calculation Report for orders shipped to Poland.
- Example: A seller who fulfilled three units of a kitchen gadget on March 30 2026 will receive a report on April 2 2026 that includes a field such as “KSeF‑20260400123,” matching the invoice stored in Poland’s national system.
Analysis & Recommendations
Why This Matters
The new KSeF identifier is required for Polish e‑invoice filing, and the shipment‑level VAT method changes the number and amount of tax lines on invoices. Without updating extraction scripts and invoicing formulas, sellers risk non‑compliant filings and revenue reconciliation errors after the June 1 2026 cut‑over.
Key Takeaways
- April 1 2026: VAT Calculation Report for Poland will include a new "KSeF Number" column.
- June 1 2026: VAT will be calculated once per shipment instead of per unit on ten EU marketplaces.
- SC_VAT_TAX_REPORT queries must be updated to select the KSeF_Number field or the identifier will be omitted.
- Invoicing engines must replace per‑unit VAT formulas with a single‑rate calculation on the shipment's net total.
Recommended Actions
- →Update extraction scripts in Seller Central > Reports > VAT Calculation Report to add KSeF_Number to the SELECT list.
- →Revise your invoicing system to compute VAT using total net shipment value multiplied by the destination country's rate.
- →Run sandbox tests for all ten affected marketplaces in Amazon's sandbox before June 1 2026 to verify correct tax and KSeF handling.
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