Will the IRS penalize me for non payment of SS and Medicare self employment taxes?

[djnavelski]

I’m retired and started an online home craft business in 2021 after the death of my significant other. Filed my taxes using TurboTax self employed and don’t recall these taxes being calculated or having to pay anything

[Bsch4477]

If you completed Sch C where you should have reported self employment income, TurboTax would have calculated self employment tax automatically. 

[DoninGA]

If you had a net profit from the self-employment on Schedule C Line 31 then you would have had Self-Employment taxes (Social Security and Medicare taxes) reported on your federal tax return.

The SE taxes are calculated on Schedule SE.  The amount from Schedule SE flows to Schedule 1 Line 4.  The total from Schedule 1 Part II Line 21 flows to your federal tax return Form 1040 Line 23.

If you did not have a net profit then no SE taxes would be entered.