There are many aspects to consider in deciding what sort of company you want to form. Instead of an S-corporation, you should determine whether it would be better to form a Limited Liability Company (LLC), Limited Partnership (LP) or even a professional company (PC).
Littleadv is correct: There is minimal benefit in forming an S-corp with you and your wife as the shareholders, if you will be the only contributor-worker. There are costs associated with an S-corporation, or any corporation, that might outweigh benefits from more favorable tax treatment, or personal protection from liability:
- The cost of initial filing to incorporate is monetary;
- Additional disclosure requirements for an S-corp versus a sole proprietorship is non-monetary, but just as burdensome as filing fees.
Filing fees and disclosure rules vary from state to state. For example, my father was a cardiologist who had no employees, other than my grandmother (she worked for free), in a state with income taxes (NM). He was advised that a PC was best in New Mexico, while an S-Corp was better in Florida (there are no personal income taxes in Florida).
The only way to know what to do requires that you consult an accountant, a good one, for guidance.