Yes, you need to file quarterly. Your Quarterly filing is based on your annual income, not your income for the quarter (why yes, that is a PITA to figure). I'm in Florida, so when I was an IC, I automatically put 40% of my income into a savings account, and that was enough to cover Federal Income Sax, FICA, and Self-employment tax. If you need to pay State Taxes, track down the requirements for that, and up that 40% to a number large enough to cover State as well.
