Official Check - (1) who's asset is it before it is cashed, and (2) is it a gift, in tax terms, before it is cashed?

The check belongs to her, and the fact that it is an official check (money was already withdrawn from your account) makes it even more so. As to...

Corporatation stock is considered a "security" within the meaning of IRC Sec 165, and a worthless security can be written off as a personal capital...

I am the administrative, do i need my brother permission to sale?

I agree with my colleague, but I would add that you should be aware that upon the sale of the condo, you will likely be liable to your brother for...

I have O-3 visa, I haven't been working in the US, no income in the US. Do I need to do anything, like filing a tax return?

You do not need to file a tax return.

Does a tax refund have to be split with spouse if I file married separately ?

There is no requirement to split your refund with your spouse.

Is that true?

Typically, this is true. However, if there was a "clerical error" made by the Department of Finance, the corrections are retroactive for 6 years....

The short answer is "yes" - even foreign citizens without any status in the U.S. can purchase properties here. What happens to the property if you...

Do I have to submit tax transcript with N-400? For some reason I cannot get it through IRS website/phone.

This seems more of a naturalization issue than a tax issue. I cannot say why you cannot get a transcript by calling the IRS - but they should be...

There are too many issues here to resolve on your own without an attorney's help. From the facts you presented, it appears that your sister would...

My mom is buying a business with my aunt and will own 50% she wants to put her portion under my name. How will this affect me?

If your mother is purchasing a business and putting it under your name, she is effectively gifting you with this share of the company. Depending on...