What is the tax status for F-1 students after filing for EB-5?

The filing of the petition alone is merely one aspect of showing intent. You are still exempt for 5 years based on student status but these are complex and you need to also look at your countries tax treaty with the U.S. to ensure accuracy.

Probably best to consult a tax attorney.

The correct answer is you should add a trusted CPA to your team of advisors. You have a few layers of tax issues to unpack (substantial presence, worldwide income, etc.), and it is best to consult with a CPA or professional tax advisor to help you properly navigate though your situation. Plus, keep in mind that unpaid tax liabilities can create immigration problems for you in the future once you apply for citizenship, so best to resolve them now. Good luck!

Filing I-526 does not grant you an immigration status; you were in the U.S. at that time incident to your F1 status. So, the answer to your question is no. You should, however, speak with a CPA to determine if you are required to file taxes, and if so, under what category. A resident for tax purposes is not the same thing as resident for immigration purposes. Finally, a mere filing of I-485 may not have any impact on whether or not you must file taxes in the U.S.

You need to ask your accountant.

This is a question for your accounting, not your immigration lawyer.