To return to the original question, whether it would be a good way to pay the IRS? I may never be in that boat but I am curious nonetheless. I just read on the TW website under the question
How can I withdraw or transfer money from my borderless account?
"Please note - you can't use your USD Borderless details to make direct debits, bill payments, or any withdrawal payment to another company as this doesn't yet work from our Borderless account".
I must say, I find some of the help less than clear. Does this suggest that payment to someone like the IRS is not possible?
In general, I find US banking a pain in the neck and way behind Europe in particular. I have a US bank account, which I've fortunately kept open, despite not living there for a long time. However, initiating transfers is archaic - they still talk about "wire transfers" and cheques (checks) are still widely used. Online, I can't even set up a payee and transfer money as and when I feel like. Thankfully, TW are able to grab money from my account by ACH debit, which has worked so far but is not instantaneous and is not free.