Please I registered for a business certificate in 2016 in Boston. I never applied for an Ein as I travelled out of the country.?

I’m not sure you’re being clear. A DBA certificate has nothing to do with taxes. Forming an entity with the Secretary if State is a different...

Massachusetts sales tax?

There are many good tax lawyers on this website to hire for that question.

How do I know if I still owe back taxes?

It's not clear. You should hire a lawyer to make sure. Usually the statute is 10 years after assessment but there are many circumstances which...

Yes, the insurance company will see if there are outstanding taxes to either the DOR or the IRS. You might want to hire a tax lawyer before signing...

Qualified business deduction?

Yes your business as a sole proprietorship counts towards the 20% deduction but I do suggest you get tax prep help as it's fairly complicated.

Can the IRS put a levy on my bank acct and garnish my wages without prior notification?

Yes, this isn't a task you should handle on your own since you have two governmental agencies seeking back taxes from you. Try to meet with a...

What legally will happen when I file taxes??

It's relatively easy to get a WAGE & INCOME report from the IRS sent to you and see what was reported under your SS by all payers and see if...

Is my approach for tax audit correct?

I don't mail anything to the IRS. If it's an audit it should be at your home or at the IRS. It could be a fraud. You should hire counsel to advise...

Filling 1040NR - HSA reimbursement - expat not living in the US anymore?

The HSA is treated just like an IRA and so cashing it out would be the same as cashing out an IRA. If you use the HSA for medical costs, then there...

How do I fill out a W9?

A W-9 is just a request for your federal ID [a social security number in your case]. The W-4 has a place to claim no withholding so make sure you...