One approach is to save a copy of your 2022 return with a different file name such as “SE tax calc” and add a Sch C with your expected income and deductions. TurboTax will then complete the calculations you are looking for. An alternative is to be sure you pay enough estimated tax at least equal to your 2022 tax liability to avoid a penalty. You can also use a rule of thumb and pay estimated tax of 15.3% of your expected net self employment income plus your marginal tax rate.
