I can help you here...
QUESTION 1: Is it sufficient for me to provide an invoice in free from? (For example, submit a piece of paper stating the project work, the amount of hours, the period of time during which the work was executed and so on..)
Certainly, you can. I bill may of my clients in email form
. What this actually turns on is what your employer (contractor) wants.. How you bill them is irrelevant from a tax perspective.
QUESTION 2: After I receive the cash, how to I report it to the IRS and how many taxes will be withheld? There are no tax treaties between my country of citizenship (Moldova) and the US, from what I've looked into.
Because they have said that they will pay you as an independent contractor, what they are telling you is that they will provide a 1099 form
in January, or so, with which you can use to prepare
your taxes. The 1099 tells you (and the IRS gets a copy of this as well) how much income
to report when preparing (or having prepared) your US taxes.
Remember, however, that as an independent contractor you should also (GET to, also) use schedule C
with your US return, so that you can deduct any expenses associated with this independent contractor work (although you may not have formalized this as a business, because you are paid with a 1099, as a contractor, the IRS sees this as a business, and therefore expects you to have reasonable expenses associated.
QUESTION 3: What is the deadline for reporting the taxes and paying them? The deadline IS, in deed, April 15th of the year FOLLOWING the year you are reporting the taxes for.
Hope this helps
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