If you have already paid social security tax on $132,900 on your primary job, then on your 1099-MISC income, you only pay self-employment tax at the rate of 2.9% (which is the Medicare element of the tax).

If you also have W2 income, you have to break out the Social Security and Medicare taxes. Only the Social Security part maxes out.  Turbo Tax does it automatically for you.

The SE tax includes what you already paid in from your W2s so your schedule SE tax will only be the difference up to the max amount of $8,249.80 for social security. The max income for social security for 2019 is $132,900 between W2 wages and the schedule C Net Profit.

Medicare is 2.9% (both er & ee parts) of all wages & schedule C profit - no max.