<prompt> Human: I started withholding 15 but another contractor suggested I withhold 30 percent. I set up an automatic withdrawal out of our primary account to savings only for taxes. Also, auto payment is based on the average of highest 4 earnings. Is 30 too much? I dont work every week and am pregnant so I will probably not work as much the further along in my pregnancy. Also, if I pay taxes quarterly and overpay, will I receive a return on my annual tax filing? We file married jointly for expected annual income of 50,000 and no state taxes.  <response>: The best simple-math answer is 15 your marginal rate. The 15 covers self employment Schedule SE, it actually goes to about 14.5 since some of it is deductible, but lets be safe and since this unwithheld income is added on top of your other income, its taxed at whatever bracket that falls into. If youre married, you get 24,000 standard deduction, and so 26,000 puts you in the 12 bracket. So 27 is probably best.And note this is all percent of profit, not revenue, since its your profit thats taxed.And yes, just like with regular withheld income, you get back every dollar you overpay. 