I am still dealing with one of these. Filed 11 years of tax returns for the client. IRS did not garnish while we were working on getting the returns prepared. Owed over 100K when it was all said and done. We did the offer, and wouldn't you know, the IRS said no. Not suprising. So we just sent in an installment agreement. Waiting for the IRS answer on that. IRS has not garrnished yet. We have been able to hold them off for two years. The clients are making very small payments right now.
The first thing you need to do, if you accept this client, is to get the open year returns filed. If he is really not making anything right now, he may have refunds to put in the pot. Then start working your way back to the years that they are looking at. Get them all done, and keep in contact with the IRS.
As stated before, no offer until all years are filed. Usually, if the IRS is not after them, they want 7 years. That is how far the software looks back unless they have a collection issue open in a year older than 7 years. If they have an open collection issue, they want back to that year.
Get your money. If this goes sideways, they will blame you for not getting them "off the hook".
Tom
Hollister, CA