AI API Expense Reporting in Taiwan: Invoices & Month-End
Which documents does a company need when buying OpenAI, Claude, or Gemini APIs? Covers invoices, receipts, eGUI, usage records, input tax and reconciliation.
When a company buys AI APIs, accounting needs to look at more than the screen showing "payment successful." Keep at least four things: the actual invoice or receipt, proof of payment, usage details, and the contract or credit terms. Whether an expense can be recognized and whether business tax can be deducted are two separate questions, and they should be handled separately.
This article focuses on Taiwan companies buying APIs. Personal ChatGPT and Claude subscriptions are billed differently from API accounts. If you have not yet decided which to buy, see "How to Choose Between API and Subscription" first.
From payment to month-end reconciliation, follow this order
- First check internal controls: whether a quotation, unified business number, a specific invoice type, project funding, or a claim deadline is required.
- Choose a channel: confirm buyer details, currency, payment method, service fees, and invoicing arrangements.
- Create API keys with clear purposes, separated by department or project, and set permissions and budgets. Working out later which project a charge belongs to is harder to fix than choosing the accounting category.
- Right after payment, save the order, the actual invoice or receipt, and the proof of payment.
- At month-end, match the documents, usage and foreign-currency conversion data together.
When integrating, besides the base URL, also check the model ID and tool features. "OpenAI-compatible" does not mean existing code needs no changes at all. For the public API entry point and usage, see the documentation.
Prepare a set of documents that can be reconciled first
| Document or data | What it can show | What it cannot prove on its own |
|---|---|---|
| Invoice / receipt, uniform invoice | Counterparty, line items, amount, and the buyer shown on the document | That every document supports Taiwan input tax deduction |
| Card or bank transfer proof | Actual payment, payment date, currency, and possible fees | That payment alone equals expense recognition for the period |
| Usage details | Usage in the period, cost by model or project | That a usage table is equivalent to a legal tax document |
| Contract and credit terms | Service rights, expiry, refunds, or reconciliation arrangements | That being able to negotiate monthly billing on the website means monthly billing terms have been obtained |
Where to find the original providers' API documents
The table below was checked on 2026-09-17. It lists how to obtain the documents, and does not treat the provider's country as an expense-claim conclusion.
| Service | Official billing source to check | What the company must confirm separately |
|---|---|---|
| OpenAI API | Billing history in the API Platform; Enterprise obtains monthly invoices per contract | Account type, tax registration data, and the documents actually received; eGUI is different from a general invoice |
| Claude API | Billing and payment records in Claude Console | Buyer details for the Console organization; do not use a Claude Pro subscription receipt in place of API usage documents |
| Gemini API | Google Cloud Billing | Payments profile, contracting entity, buyer tax data, and the current bill |
| DeepSeek API | Payment and usage dashboard of that account | Payment currency, buyer information, and documents actually provided; confirm with the provider before paying |
| BazaarLink | Orders, invoices, and account usage for the actual payment channel | Invoicing channel, company title and unified business number; special enterprise arrangements must be confirmed first |
The OpenAI official billing explanation distinguishes documents and payment arrangements for Enterprise and other API accounts. The Claude API invoice explanation distinguishes contract usage from prepaid credit documents. The Gemini API official billing guide links to Cloud Billing. After downloading a document, read its content; do not assume a PDF is a Taiwan uniform invoice just because of its file extension.
For each provider's buyer details and documents, see OpenAI unified business number and eGUI, Claude unified business number and subscription / API documents, and Gemini invoices.
Cross-border electronic services: first distinguish the buyer
The Ministry of Finance's official explanation clearly distinguishes between overseas e-commerce sales to individuals and electronic services to business operators and government or organizations. For company purchases, you cannot directly reuse the personal-account process of "receive 5% and you get an eGUI," nor can you skip the reporting judgment for overseas services just because there is no Taiwan invoice.
The treatment under Article 36 of the Business Tax Act depends on the buyer and the purpose: a business operator used exclusively for taxable purposes, a business operator with mixed use, and government or organizations should not be given the same answer. Have accounting confirm the actual invoice or receipt, the buyer's tax registration, and the purpose. Whether an overseas service involves income tax withholding must also be judged separately based on the transaction.
How BazaarLink can support Taiwan procurement
BazaarLink is operated by 集聯科技有限公司 (unified business number 62232477) and can issue Taiwan electronic uniform invoices in both two-part and three-part formats. When a company title and unified business number are needed, fill in the buyer details before payment and choose a checkout channel marked as supporting invoice issuance. Quotations, specific expense-claim documents, enterprise remittance, or monthly billing needs should first be confirmed with sales. Until approved, do not treat them as ready-made payment terms.
Usage can be managed under the same account, which also makes it easier to organize multi-model purchasing. Customer unit prices for API models follow what is shown on the model catalog at the time. Service fees, exchange rates and transaction terms for payment channels are shown on the checkout page. For estimates, use the customer price of the actual purchase channel rather than directly applying the original provider's price.
Data mismatch after payment: do these things first
Expenses advanced on a personal card are not automatically ineligible for reimbursement, but you should keep the original documents, the business purpose, and the company's approval records. A single screenshot of the charge is usually not enough to reconstruct the full transaction. First obtain the supplier's invoice or receipt, order, and payment records.
If the company title or unified business number was left out, contact the original transaction party to confirm whether it can be corrected. Do not assume every issued document can be amended. For BazaarLink orders, you can provide the order number to support@bazaarlink.ai for case-by-case confirmation. If a third party is asked to help with procurement, also confirm the actual authorization, the transaction, and the items issued by the supplier. Do not simply buy an invoice that has no connection to the original transaction.
For accounting categories and the timing of recognizing prepaid credits, see AI API accounting categories in Taiwan.
FAQ
Can BazaarLink issue Taiwan uniform invoices?
Yes. 集聯科技有限公司 can issue two-part and three-part Taiwan electronic uniform invoices. Before payment, the company should fill in the invoice title and unified business number, and choose a checkout channel marked as supporting invoice issuance. For special expense-claim documents, contact sales first to confirm.
Can I not expense an overseas API charge if there is no Taiwan invoice?
That cannot be decided on that basis alone. Expense recognition should be confirmed based on the actual invoice or receipt, proof of payment, business purpose, and company policy. Input tax credit deduction and overseas electronic service reporting are a separate judgment.
Can API charges paid with an employee's personal card never be expensed?
Not automatically. Keep the original transaction documents, payment records and purpose information, then follow the company's approval process and accounting judgment. Do not attach only a screenshot of the card charge.
Are BazaarLink API prices always the same as the original providers' prices?
This article does not provide that guarantee. Customer unit prices for models follow the current model catalog. Service fees, exchange rates and other conditions for payment channels are subject to the checkout page or the approved enterprise contract.
Can a research project buy API credits directly and expense them?
First confirm the project's eligible expense items, usage period, and payment and document requirements. If a quotation, company unified business number, or specific documents are needed, confirm with sales before payment what can be provided. Do not assume it qualifies just because the supplier is in Taiwan.
TWD billing · Taiwan invoices · leading AI models · OpenAI-compatible API