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.

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

What is the difference between the gross and net interest rate?

Share your experience of using a bad credit loan or a payday loan: was is it helpful for you?

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?

Has anyone ever used invoice financing for their business? How was the experience and what benefits did you get?

What are the best ways of spending money apart from spending just on shopping and entertainment? When can spent money be never regretted? Add your feedback please.

When can I file my 2017 tax returns?