I found myself owing the IRS 18k last year. What I did was hop on a payment plan. They let you choose the amount you'll pay, so you can pick something manageable. Toss any bonuses and extra cash towards paying it off. You'll accrue interest on the outstanding balance, but it's a small amount to pay and is not capitalized.

You may also want to head over to r/whitecoatinvestor, which is a better forum for people with high incomes who are trying to work through financial questions.