Estimated tax payments and withholding have absolutely NO bearing on whether or not you qualify for none, some or all of the electric vehicle credit. After you deduct your standard deduction or itemized deductions, you have your taxable income. If the tax on that income, less any credits you must apply first, is more than zero, you will receive that portion of the credit, not to exceed $7,500. I've taken the full credit twice (once for tax year 2016 and again for tax year 2019), so I can assure you that I am correct. However, since I had no conflicting credits and I don't know your situation, I suggest you trust TurboTax to calculate your credit correctly. It even knows that a GM or a Tesla no longer qualifies. Had I not purchased my Chevy Volt in Q1 2019, TT would have calculated just $3,750 and, if not until Q4 2019, it would have calculated just $1,875.
