yes , although they requested my W-2s for the interview, I was given an RFE for my employer's. I got pretty much the same advice from green card aspirants or permanent residents from message boards which caused unneccessary stress and panic. USCIS is quite aware that many who are illegally employed are unaware that they can pay taxes without a SS# which is why the sole responsibility is on the employer.
The responsibility is
always with the individual who owes taxes. Your employer doesn't know how much to withhold. You might have six kids and can claim enough exemptions to make your taxable income zero. Or, you might be making a lot of passive income on the side, in which case you need to withhold an additional amount. The responsibility to make sure your withholding is correct is with you. I can tell my employer right now to change my withholding to zero (by claiming a lot of allowances), although in the end I only harm myself by having to pay a penalty if I withhold less than 90% of the tax I owe.
And if I may say, while it's unfortunate if many illegally employed are unaware they
can pay taxes without SSN, I hope they also understand that they
must pay taxes.
I think it's in the best interest of illegally employed to pay taxes, especially if they do not have a legal immigration status. In my opinion, Americans have been very tolerant of illegal immigration. But, if American citizens or their elected representatives were to find that these individuals tend to not pay taxes, and it raises the tax burden on all legally employed, I'm not sure if this tolerance would last very long.
Let me do a simple calculation here. Let's assume those illegally employed who do not pay taxes are 5% of the workforce and they represent the average taxpayer in terms of tax obligations. Then, I would expect my income tax to be 5% inflated above what it should be if all gainfully employed individuals were to pay tax. This is $1000 tax in my case. Why should I have to pay $1000 more so you don't have to pay your (back) taxes?
In all fairness, I don't want to accuse all who are illegally employed or illegally present of evading taxes; I just wanted to explain what the consequences would be. I'm sure those who evade taxes are a minority. There are probably many more who have too much tax withheld from their paycheck and, because they don't have a SSN, don't file a return and don't get the refund they deserve. I'm grateful for every illegally employed individual who pays taxes, even if it may be an easier choice for them to do otherwise.