These vary between states, counties, towns, and even districts within towns. But one tax all successful business proprietors pay is self-employment tax. It amounts to roughly double what you paid to "FICA" on your employee pay stubs, or another 7 percent right off the top of your pay and profit (unless you form a corporation, which is another story for another day). Some jurisdictions have property taxes on homes, automobiles and business equipment--even professional camera gear. Business license requirements are also very common, with some businesses needing to pay multiple jurisdictions. Some areas require special licenses for visiting commercial photographers. Check with your good, local attorney and local officials.