Was my terminated payroll accountant legally allowed to submit quarterly tax filings on my behalf

It would depend on the contract you have with them and the nature of the termination. Impossible to say without knowing a lot of details. As to...

Can I establish an LLC as a foreigner for the purposes of buying, renovating and onselling property in the US?

Yes, an entity can be structured to avoid FIRPTA withholding, but as with anything, there are a lot of trade offs and it is not simple. You need to...

The distribution creating negative equity in the S corp is a taxable capital gain unless the shareholder has a loan to the corp. One also cannot...

What are my options against Tax Preparer?

The IRS does not deal with state tax returns so there is a bit of a conflict here. You are required to pay the taxes you legally owe, not the...

Does my spouse have to include me on her tax filing if we are separated?

Anyone can file married-separate, so no.

How much money can I give my children as an advance on their inheritance without them being taxed?

At the federal level, you can give away up to $5.4 million without gift tax. The amount is credited toward the estate tax which only kicks in at...

Forg my signature

Which he shouldn't have done, but what is your question? Please re-post with more information.

What is the optimal state for me to start an LLC from the tax perelspective?

You need a good tax/business attorney to set this up for you. When US citizens live abroad, they are entitled to a number of benefits under tax...

I received a Notice of Proposed Assessment on Income Taxes for Tax year 2009 and 2010 and I did not respond.

You need to get a consultation with a CA tax attorney who handles state tax matters. Since this is so long in the past, they may have some other...

Can I use my ITIN for work purposes? Some what like a social security.

No, you cannot use an ITIN for employment purposes. Tax reporting only.