Do I have to file a separate tax extension for business and personal needs?

Yes. The IRS generally requires different tax extension applications for both personal extensions and business extensions. However, there are exceptions for certain sole proprietorships and single-member LLCs (limited liability companies). If you report your business activities on your personal tax return, then you can file a personal income tax extension (IRS Tax Form 4868) which will extend both your personal and business tax deadlines.