I need to pay estimated tax. I started to work as self-employed in July 2021, so it is the first time I will do it. Also, I never filed any U.S. tax return before. Can I pay estimated tax online? I tried IRS Direct Pay but it needs to identify me using my previous year tax return which I do not have. However, while trying to pay using credit/debit card (e.g. through PayUSAtax), it doesn't ask for the identification using previous year tax return. Is this a way to go? Or should I sent a money order to IRS instead?
