This TurboTax help page should answer most of your questions:
https://turbotax.intuit.com/tax-tips/small-business-taxes/estimated-taxes-how-to-determine-what-to-p...
When you do your tax return, you'll enter your estimated tax payments in the Estimates and Other Taxes Paid section of TurboTax. It's up to you to keep track of your payments.
If your estimated quarterly payment is $2,000 (for example), you're perfectly free to pay more.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
