I'll discuss how QuickBooks Self-Employed (QBSE) calculates your taxes so the data you'll send to TurboTax is accurate, Ray.
Your estimated federal income and self-employment taxes are calculated by applying income tax rates on your total self-employment taxable profit from your business, along with any personal income you reported from other sources. Then, your self-employment tax is determined by applying Social Security and Medicare tax rates to your business taxable profit.