Ask How do I handle taxes and legal issues in freelance business?

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I recently started freelancing business, and I'm confused about taxes and legal stuff. Do I need to register my business? Should I be paying taxes differently than a regular job? I don't want to run into problems later, but I have no idea where to start.

Also, are there any contracts or legal documents I should be using with clients? I want to make sure I'm doing everything the right way.

I'd really appreciate any advice from experienced freelancers. How do you manage taxes and legal matters in your freelance business?