Active Pharmaceutical Ingredient (API) Inventory Purchase
Recording the purchase of a controlled API from a contract manufacturer for use in drug production.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Raw Material Inventory — API | Asset (+) | 1,800,000.00 | - |
| Accounts Payable (CDMO / API Supplier) | Liability (+) | - | 1,800,000.00 |
💡 Accountant's Note
API is typically the most expensive component of a drug's manufacturing cost. It is purchased from contract drug substance manufacturers (CDMOs) and held as raw material inventory until consumed in production. API costs can represent 30-70% of total COGS for small molecules and higher for biologics.
Practitioner & Systems Framework
💻 ERP Architecture
API purchases are processed through the procurement module against approved supplier purchase orders. The API is received into raw material inventory at cost, including import duties and freight. Each API lot is tracked in the materials management system by lot number, expiry date, and certificate of analysis (CoA). The inventory is valued at weighted average cost. API with shelf life approaching expiry requires NRV testing. For controlled substances (Schedule I-V in the US), additional DEA regulatory tracking requirements apply.
⚠️ Audit Flags
Auditors test API inventory existence through physical count and reconciliation to the materials management system. For high-value API (particularly biologics drug substance), auditors may request independent verification of inventory quantities at the CDMO's site. Test the expiry date profile for API approaching its use-by date — NRV provision may be required. Confirm that API purchased for clinical trials is expensed as R&D (not capitalised as inventory for commercial production). Verify that controlled substance API is tracked per DEA requirements.
📄 Required Documentation
Purchase order and CDMO invoice, goods receipt note, certificate of analysis (CoA) per lot, materials management system lot record, expiry date profile, NRV assessment for near-expiry API, DEA controlled substance tracking records (if applicable), and CDMO quality agreement.
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