Not sure how old you are, but that isn't going to be easy, and it will, at times, be more expensive than just paying some tax.
I have clients that will spend $.95 to save a $1. I have other clients that plan and act appropriately and pay 19% on a $35m AGI yearly.
I agree with AC ultimately. The better course of action is to get involved and try and get your voice heard, because fucking with the IRS just isn't going to go over well. They have the resources to spend 18 weeks pouring through every transaction for the last 5 years to come up with a $20k adjustment. The professional fees, interest, penalties and possible jail time are much much much more expensive than the tax.
Irrelevant of how happy you are on what they piss your money away on, when it comes down to it, if you have a family particularly, risking your freedom for 15-30% of your income is a tough choice.