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

Does a nonprofit (not for profit) organization need to have an independent review and/or audit of its financial statements?

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.

Which washer/dryer will qualify for an energy-efficient tax credit?

Can anyone share some tips for budding entrepreneurs. What are the do's and dont's for them.

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

What are the some available defenses against product liability claims?

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.