This isn't legal or tax advice. Get a lawyer or CPA for that...
Like your accountant has said, get an S-corporation or an LLC (if LLC, make sure it's taxed as an S-corp).
What happens is this-
Your current situation, dumbed down greatly for the purpose of easy numbers:
Income: 50,000
Income tax percentage: 25%
Self-employment tax: 15%
Total tax percentage: 40%
Amount you pay 40% taxes on: 50,000
Taxes: 50,000 * 40% = 20,000
What you could do with an S-corp:
Income: 50,000
Pay yourself 25,000 salary for the year
Other 25,000 is profit for the company
25,000 salary gets hit with income tax + self-employment, ie 40%
25,000 company profit hit only with income tax, don't pay s/e: 25%
25,000 * 40% = 10000
25,000 * 25% = 6250
Total taxes = 16,250 (a savings of $3,750)
What will it cost you to do this? In my state it's $105 to create an LLC (don't pay a stupid lawyer to do it. They'd charge $600, and all they do is go to the state's website, fill out an online form and have it done in 15 minutes. Find out how to do this yourself and save the money).
$105 spent to save $3750, or more. Just go do it.
One other thing: be sure to pay yourself a salary throughout the year. If you don't know how ask your CPA or Google it. Reasons why you need to do this:
1) If you don't pay yourself a "reasonable salary", the IRS will get pissed that you're saving too much by not paying any s/e taxes.
2) If you don't have any W2 income, most lenders and bankers who are living in the stone-age are scared to give you a loan or a mortgage because you're too risky, unless you've been in business for 2 years +. So you have your own company pay you a salary and give you a W2. They don't really care if you happen to own the company that issued the W2 and wrote the paychecks, so long as you have one of those magical forms. Stupid? Yep. Welcome to the banking world.