Taiwan AI API Expenses: Tax ID, 5% VAT and Withholding

Disclaimer: This article is a general overview of information and does not constitute tax or accounting advice. For the tax rates, withholding obligations, and input tax recognition rules that actually apply, please rely on announcements from the Ministry of Finance and the judgment of your accountant or bookkeeper.

Why buying directly from the vendor often gets stuck at expense reporting

Engineering teams usually only need a credit card to apply for API keys from OpenAI or Anthropic, and access can be activated in a few minutes. But the real hassle is often not "how to integrate it" but "how to record this payment." Especially when a company needs to file taxes, request payment, or go through internal expense approval, overseas credit card bills often run into three problems.

Problem 1: Receipts are not uniform invoices

For a Taiwan company to file expense claims and deduct input VAT, in principle it needs legitimate uniform invoices or equivalent vouchers. However, overseas providers such as OpenAI and Anthropic issue receipts or invoices in their own formats, not Taiwan uniform invoices. Whether your accountant can use this document as an expense voucher, and whether it can be used to deduct input VAT, depends on how your company actually handles taxes and on your accountant's judgment. Having a receipt does not mean you can automatically file the expense.

Problem 2: 5% VAT for Taiwan accounts

A more recent change: starting May 1, 2025, for Taiwan accounts, if no valid uniform business number is entered in the account settings, OpenAI adds a 5% value-added tax (VAT) to the bill. This drew considerable discussion at the time, because many developers only noticed the extra charge after seeing it on their bill.

One point that is easy to confuse: entering a uniform business number in the account mainly lets OpenAI determine that you are a "registered Taiwan business operator" so that the 5% is not charged. But this does not mean that the eGUI (electronic uniform invoice) you receive after entering the number can automatically be used to fully deduct input VAT. Whether the tax ID field correctly matches a legitimate voucher for the "correct purpose," and whether it can be recognized as input tax, still depends on your company's tax status and the nature of the transaction. Please confirm this directly with your accountant. This article does not draw a conclusion.

Reference source: OpenAI Help Center — Taiwan VAT and eGUI

Problem 3: Withholding issues when paying foreign companies

When a Taiwan company pays a foreign for-profit enterprise for "service fees," there may be an obligation to withhold tax or for the payee to file on its own. Whether this applies and at what rate depends on factors such as the nature of the transaction (whether it constitutes "providing services within the Republic of China"), the amount, and whether a tax treaty applies, and it varies from company to company. Please be sure to consult your accountant or bookkeeper on this. This article does not provide any specific tax rates or applicability conclusions. Getting a withholding obligation wrong usually has far more serious consequences than asking your accountant one more question.

What buying through a Taiwan supplier can simplify

If your company does not want to re-verify these three questions every time, a common approach is to purchase AI API credits from a supplier with a Taiwan company entity that can issue formal uniform invoices, rather than paying the overseas vendor directly by credit card.

Take BazaarLink as an example: it is an AI API relay service operated by a Taiwan company (Jilian Technology Co., Ltd.), allowing you to call OpenAI, Anthropic, Google, and other model providers through a single set of APIs. Pricing is billed in USD and quoted in NT$ (updated daily based on the exchange rate). It can issue uniform invoices, and companies can also negotiate monthly billing terms (Net-30, negotiable). These are all normal transaction processes between Taiwan companies, so your accountant does not need to separately research "how to handle a USD charge from overseas."

Note that this only addresses whether the voucher is a Taiwan uniform invoice and whether the counterparty is a Taiwan company. It does not change your company's actual tax status or applicable rules. In other words, a uniform invoice can make the expense claim process much smoother, but how expenses should be recognized and whether they can be fully deducted is still the same question. Once the voucher is correct, however, your accountant will find the handling much easier.

Conclusion

When overseas AI API bills cannot be filed for expense reporting, it is usually not because you did something wrong, but because the original purchasing path was never designed for the expense reporting process of Taiwan companies. Rather than discovering afterwards that a 5% VAT was added or that your accountant returned the receipt, it is better to choose a purchasing channel that can issue Taiwan uniform invoices from the start, and handle two things separately: whether the voucher is compliant, and how the tax should be recognized. The first can be solved by choosing the right supplier; the second should always be discussed with your accountant.

TWD billing · Taiwan invoices · leading AI models · OpenAI-compatible API