I wish I could find a way to use the card to pay Q1 2020 estimated tax. Right now the menu offers only 2019.
You could pay under 2019. Then, when you do your taxes, you will have an overpayment, right? You then apply that overpayment to your 2020 tax year. Or get it refunded.
Also, many towns let you pay property tax with a CC. Our town is at 2.5%. Not the best way to reach spend, but it works. I did it for my last $500 to make sure I hit the spend.