Can I deduct OpenAI API costs for my app?

Usually, yes—if you’re paying OpenAI API costs for an app you’re building or operating as a business, they are generally treated as a deductible business expense, similar to cloud hosting, SaaS, data processing, or software tools.

For U.S. taxes, the key points are:

• If the app is an active business, API fees are typically deductible if they are ordinary and necessary for that business.
• If the API is used to run the app for customers, prototype features, test functionality, or support development, it is usually business-related.
• If you use the same OpenAI account for personal and business use, deduct only the business portion.
• Keep invoices, payment records, usage logs, and notes showing how the API was used for the app.
• If you have not launched yet, some costs may be treated as startup or development costs rather than immediately deductible operating expenses, depending on the facts.
• If the app is only a hobby or side project with no real profit motive, deductions may be limited or unavailable.

Practical approach: categorize OpenAI API payments as a software/cloud/API service expense in your bookkeeping, allocate any personal use out, and ask a tax professional whether pre-launch costs should be deducted currently, capitalized, or treated as startup expenses.