Hello - 2021 was the first year that I started working as an independent contractor. I misunderstood the requirements for estimated quarterly tax payments and just paid one large sum prior to the 9/15 deadline. Do you have a sense of how common penalties for late estimated payments are?
Here are some links to more information regarding estimated payments, and penalties for late payment. One is from TurboTax and I think it addresses your question :
As a follow up, here is a link to the instructions for form 2210, which is the form that is used to determine the amount of penalty, in the event that there is a penalty.
If you have any further questions after reviewing this information, don't hesitate to reach out with details more specific to your situation.
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