[GordonReid]

I stumbled upon this thread, and I can relate to your situation. I'm not an expert in taxes, but it sounds like a complicated issue. I can understand how frustrating it must be to receive such a large tax equalization payment demand from your previous company, especially when you left the US four years ago and the company two years ago. Have you tried contacting your previous company's HR department or payroll team to ask for more information on why you owe them money? It might be helpful to have a clear understanding of the basis of their claim before deciding your next steps. I recently discovered a website where you can use a check stub generator free to create pay stubs, which might be helpful for you to keep track of your income and taxes. However, in your situation, it's important to get more information from your previous company and seek advice from a tax professional to understand your options and potential liabilities.