I am a MD/MBA student and I am in a good position to write on the business side of medicine.
The secret to being a rich doctor lies with the following:
-managing cash flows
are you getting paid consistently? are the payments increasing over time? are you reinvesting some of the cash into your practice? are you saving enough in interest bearing accounts? are you good enough in managing account receivables (collection agencies)? Are you a provider for the major insurance companies?
-managing cost structures
do you have too many overhead expenses? staff levels? should you buy or lease expensive medical equipment? do you have enough doctors in your group practice to share the overhead costs? can u avoid doing expensive procedures that place too much financial burden on your part? have you looked around for the cheapest insurance?
-managing debt structures
do you have good payment plans to pay off ur student debt? mortgages? office loans? have you looked for loans that have the lowest interest rates?
Remember some debt is useful to get tax deductions, but too much debt is bad.
Its always a good idea to get loans to start ur private practices from the US Small Business Adminstration versus from banks, as the latter charge a lotta interest and fees.
-managing investments
There are some people I know who really dont work at all.They pretty much sit in thier homes playing the stock market, and earn 6 figure incomes. So if you wanna make extra cash, the stock market can be a good idea.
To reduce risk/earn money you must follow up on business news such as WSJ, Business Week, CNBC etc.
There are some doctors who invest/own nursing homes, hospitals, clinics etc to get some side cash.
-developing and implementing strategies for future growth
Successful businessmen have excellent foresight with regards to "whats the next big thing?". If you are able to predict where and when you will be able to earn more and develop strategies to get there, you will be richer than your peers who didnt think that far ahead.
-reducing risk
Risk in medicine has mainly to do with malpractice and uninsured populations. Group practices reduces both these risks, as you can "eat up" sunk costs (theory of economies of scale).
-marketing
If you are the best doctor in town and nobody knows that you exist, thats a problem. Marketing and advertising through mail, media and referrals could substantially increase your patient base. offering discounts or coupons or convenient hours and locations can substantially help draw patients.
-location
You want to be located in a community that has low operating/living expenses (definitely NOT the cities). Its the suburban areas where the costs are high and the patient payor mix is mostly insured.
-tax liabilities
In 2005, the tax brackets for a single (unmarried) person were:
10%: from $0 to $7,300
15%: from $7,301 to $29,700
25%: from $29,701 to $71,950
28%: from $71,951 to $150,150
33%: from $150,151 to $326,450
35%: $326,451 and above
(Source: Wikipedia)
If you make over $100,000 it puts you in the 30%-35% tax bracket...in other words a third of ur money goes back to the government.
If you are able to "shelter" income through legal means and obtain enough deductions you can decrease ur taxes signicantly...I sound like Andy in the movie The Shawshank Redemption when he convinces the guard about his taxes.
good luck-)