How long will my offer in compromise take to complete?

It depends upon the area of the country in which you live. At this time, in Southern California, it is taking the IRS at least six months. In many cases, it takes more than a year to give final approval to an offer in compromise. In the meantime, unless you handle the negotiations properly, you will be required to make payments which will not reduce the amount of the offer you are required to make, and might even increase the amount!