Okay, due to popular demand, I will now reveal, with a few caveats, the formula for getting a rough idea of what revenues a practice will generate based on the average number of patients on-treatment. Multiply the average number of on-treatment patients by $24,000. For example, if a practice maintains an average of 50 pts on treatment, one would expect that practice to generate annual revenues of around $1.2 million. Now this assumes an "average" caseload, whatever that is, and around 5% uninsured patients. This does NOT take into account practice expenses, but for most hospital-based practices the overhead is minimal. In my nearly 20 years of hospital-based private practice, the typical yearly expenses would include malpractice insurance at around $15,000 per physician (less during the first few years of practice), health insurance at around $12,000 per physician/family, billing at 8-10% of collections, and miscellaneous expenses at around $12-15,000. So let's go back to the hypothetical 50 patient, two physician practice; after expenses, the net revenue available for physician compensation would be around $1.0 million. Currently you can have up to $45,000 per year of pre-tax money put into a retirement plan ($50,000 for those over age 50). So if both docs do that, the expected bottom-line payout to each doc should be around $450K per year.
The caveats: this will vary some by region; if you are doing alot of SRS/brachy/Gammaknife it could be higher; if there is high HMO penetration it could be less; these numbers will likely go down ALOT over the next few years, although I've been hearing that since I began practicing, and although there has been slow incremental decrease in reimbursement, somehow we, as a specialty, have been spared the deep cuts suffered by most other previously-lucrative specialties over the years. The American College of Radiology (ACR) has worked hard to keep it that way, but you never know when it will end. Final caveat: this is completely off the record and for your personal use only. Use this as a guideline, but don't take out a mortgage based on it.
Bottom line: to the med students considering this specialty, do it if you think you'll enjoy it, not for the money. The lifestyle will almost certainly remain a good one compared to most of our peers, but the money may not, so you should be in it because it's what you want to do. It's a great field to be in right now; I certainly have absolutely no regrets about it, and feel incredibly fortunate to have found it. Good luck.