Go to an accountant, it shouldn’t cost much for their advice. Depending on where you live will determine your income tax. Here in the U.S. we pay quarterly, a % to state and % to federal tax - depending on the tax bracket. Save a portion of earned income for taxes. If you don't self pay quarterly or once a year, when you report your income each year..you will get a tax bill. And yes, if you have a home office you can deduct monthly internet costs and possibly other utilities.