Hi,
Here is an estimated taxes link. Estimated Taxes
Within this link, there is the Tax Withholding Estimator. Tax Withholding Estimator
You can use that link to compare the calculations, they should be similar to the amount owed that was shown in TurboTax, and TurboTax's calculations are very likely to be correct based on what was entered into TurboTax.
You may have received a 1098-T (tuition), or 1098-E (expense) forms from your educational institution which can be entered in the deductions and credits section of TurboTax. I suggest logging in to your school's portal, or asking them if you received those forms.
You may also be able to write expenses off under the self-employment income and expenses section of TurboTax, such as mileage, home office, office supplies, and even the TurboTax fee that you paid in 2023, for the 2022 tax year (you can enter that as an other expense or as a legal & professional fee within the self-employment income & expenses section of TurboTax).
