I am an independent contractor, so every quarter I have to pay my estimated taxes. I found it a pain to have to mail my estimated taxes voucher out and I also worried that it could get lost in the mail which would cause a headache with the IRS.
That said, I found
eftps.com, which is The Electronic Federal Tax Payment System. It is a Federal Goverment Program that allows you to schedule your payments online.
I linked my bank account with my profile and can pay safely and securily through their system. It has saved me headaches and worries about making my payments.
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