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Are you amending your 2023 tax return?   The 2024 amending software has not been finalized in TurboTax.

It is automatically calculated, and Form 8959 is automatically generated, based on your wages, railroad compensation, and self-employment income entered into TurboTax.   When you enter this income in excess of the thresholds, TurboTax creates the form.  

 A 0.9% Additional Medicare tax applies to Medicare wages, self-employment income, and railroad retirement (RRTA) compensation that exceed the following threshold amounts based on filing status:

• $250,000 for married filing jointly;
• $125,000 for married filing separately; and
• $200,000 for all other taxpayers.

If you receive both Medicare wages and self-employment income, calculate the Additional Medicare tax by:

1. Calculating the Additional Medicare tax on any Medicare wages in excess of the applicable threshold for the taxpayer's filing status, without regard to whether any tax was withheld;
2. Reducing the applicable threshold for the filing status by the total amount of Medicare wages received (but not below zero); and
3. Calculating the Additional Medicare tax on any self-employment income in excess of the reduced threshold.

Don't consider a self-employment loss for purposes of this tax. Compare railroad retirement (RRTA) compensation separately to the threshold.

All Medicare wages, railroad retirement (RRTA) compensation, and self-employment income subject to Medicare tax are subject to Additional Medicare tax, if paid in excess of the applicable threshold for the taxpayer's filing status. For more information on what wages are subject to Medicare tax, see the chart on Special Rules for Various Types of Services and Payments in Section 15 of Publication 15 (Circular E), Employer’s Tax Guide.  @nidhirawal