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If you are not concerned about product liability, then there are few really great reasons. IF you are a one person corp, then there is no real tax difference between sole proprieter, LLC or S corp. You also will not be likely to get loans or credit for the company without a personal guarantee, so no benefit there either. It would take several years of corporate tax returns to provide enough proof to a bank that it is a valid entity in its own right.
Also, dont forget that C and S corps need to have annual meetings, file annual reports etc. or the shield of the corporation becomes null and void. LLCs do not have this rule, and some lawyers feel that they are less sheilded. So unless you are trying to go public and be the next google, there is not really any benefit to being a corporation.
My company is an LLC. We sell truck accessories and wanted to protect ourselves from liabilty lawsuits. If the company is successfully sued, then there are barriers for my personal assests. I also wanted to not have my personal credit score directly impacted by business activity, because I do some real estate investing on the side. I still had to sign personal guarantees, but my credit report will only show the business debt if it does not get paid. Otherwise it appears that I have less credit extended than is the reality. This is useful to me for the purpose of qualifying for home loans.
I hope that helps!
If you are not leaving money in the business at year-end, then an LLC or S-Corp is the better choice. But there's really no tax benefit, as gpilling pointed out, only the legal liability protection.