What exactly is accounts receivable financing and factoring and how can it help a business?

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.

Hello,

I am a Tunisian national on J1 Visa in the US. However, I have never paid taxes in Tunisia. I did my PhD and was working in France for 5 years paying taxes there. I got my visa in France. Is my tax residency France or is it Tunisia? Because if I claim it to be Tunisia, there is no two years tax treaty. If it's France, what documents I need to claim the tax refund?
Thanks

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

Is commission rebate from the buyer's Realtor to the buyer a taxable income? Transaction was done outside of the escrow and 1099-Misc (Box 7) was issued to the buyer following January. 1) is this taxable income for the buyer and 2) if so, is he responsible for SE taxes as well?

To my peers. Do you have concerns over the new RTRP(Registered Tax Return Preparer) testing and licensing? Do you have up to date information? Are any of you thinking of leaving taxes. What about you fincial planners that also prepare are you understanding the disclosure rules that efect everyone in the tax industry? Look for some great dialog.

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?