Taxes do need to be considered. For me as a self employed person, I can simply add it to my other self employment income. I have expenses so those are already reducing my income.

The best advice I ever got from a cpa/bookkeeper was that the sole proprietorship business is one of the best situations for individuals, and married couples can combine all their various businesses (separate sched c's for each business). This is of course United States...

Like any business you can deduct the expenses from the income before calculating taxes. Never throw away a receipt! Keep good records of expenses including that $5 usb cord at the dollar store!

We've had sole proprietorship businesses for about 40 years...

Like here on Steemit, nothing is too small it all adds up.

My disclaimer : this is not legal or financial advice but financial common sense. Do invest some $ in a sit down with a tax pro or cpa and find what works best for your own situation. Everyone's life is different, every state has it's own little rules!