Automating tax calculation from Amazon VAT reports: a system design for VAT service providers

Описание и применение

Платформа автоматизирует расчёт НДС из отчётов Amazon, классифицируя транзакции по семи категориям, применяя таблицу правил страны и выводя все необходимые поля декларации, уменьшая ручную работу и ошибки.

Задача

VAT service providers spend excessive time and risk errors converting Amazon VAT Transactions Reports into country‑specific return boxes.

Результат

The platform reduces manual effort, eliminates spreadsheet errors, and provides traceable calculations for VAT returns across multiple countries.

Рабочий процесс

• Upload Amazon VAT Transactions Report and deduction documents
• System classifies each row into a sales category based on tax collector, buyer VAT status, and ship‑from/ship‑to countries
• Apply country‑specific treatment table to compute output and input tax per category
• Fetch daily exchange rates and convert transaction amounts to filing currency
• Aggregate totals into UK VAT Return boxes (Box 1–9) or equivalent EU return structures
• Present calculated totals to seller for confirmation
• Seller confirms and submits; operations review calculations and manage payment proofs
• File return with accounting firm; await payment; mark filed

Доказательства

Accountants sort the report in Excel by country, rate and deductible item, then copy the numbers into each country's return.

Источник

Instead of writing rules country by country, we first put every transaction into one of 7 sales categories.

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The system fetches exchange rates daily and converts each transaction at the rate for its date.

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20 end‑to‑end automated tests covering the main calculation paths

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