I am doing freelancing for two different companies and I have several questions. I deliver for them digital files, such as research, PowerPoints or excel files. Do I need to add sales tax to the invoices? When and how do I file taxes? I have never worked before in California and just started working in October last year.

Is a credit card statement considered a viable replacement of a receipt for income tax documentation of expenses or are credit card slips still required?

What is a Future Delphi credit scoring and how does it work?

Can I claim child tax credit for my son born on December 31?

Can The IRS Revoke My Passport?

What is the best way to save credit card surcharges?

What are the some available defenses against product liability claims?

If I participate in my employer's 401K plan, can I also set up a SEP-IRA for my self-employment income?