It sounds like you'll benefit from using our Tax Caster Calculator. Even though the calculator is set up for 2022, it should get you pretty close to your number for 2023. You'll want to fill out the whole calculator, but especially be sure to put your estimated net business income (income minus expenses) in the Business owner/Self-employed section. This will calculate what, if anything, you're projected to owe for the year, which you can use to determine how much to pay in quarterly estimated payments. As of today, there is still time to make a third-quarter estimated tax payment (due by September 15th, 2023) and a fourth-quarter estimated tax payment (due by January 15, 2024).
When you use that calculator, it calculates your self-employment tax, which includes the portion for Social Security and Medicare taxes. Also, when you use Form 1040-ES to make an estimated tax payment to the IRS (or if you make an estimated tax payment online), you don't have to make a separate payment to any other agencies to cover your Social Security and Medicare tax. Estimated tax payments do go towards that.
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