Answer : It depends on what country you are asking about. In the United States, interior designers do have to pay taxes. They are considered self-employed and are required to file a Schedule C with their annual tax return. This is true whether they are working for a company or running their own business.
Generally, self-employed individuals are responsible for paying both the employee and employer portions of Social Security and Medicare taxes. They also have to pay any applicable state income taxes, as well as federal income taxes. However, there are a few tax deductions that interior designers may be able to take advantage of, including deductions for home office expenses, business travel expenses, and equipment purchases.