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I had no issues with paying state and federal estimated income taxes online. Can someone share the website to pay the estimated FICA taxes?
When you pay self-employment tax you are paying Social Security and Medicare for yourself since it is not being withheld by an employer. Your estimated tax is going for the SE tax as well as your ordinary income tax. When you prepare your actual tax return the amount for SS and Medicare will be calculated and it will go to where it is supposed to go-- for SS and Medicare.
https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922
https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax
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