UPDATE - I was randomly finally able to submit the rest of my HST. No rhyme or reason to this - I did the exact same thing I've been doing all day. What a pain in the ass.
I'm self employed, so I have to remit my HST to CRA. I choose to do it quarterly. Yesterday I went in to enter my numbers and it wouldn't accept my reporting dates. I know I was entering the right dates, so I gave up and went over to submit my payment since it was due yesterday (I have until June 15 to actually file my first quarter HST). Yesterday it accepted a payment of $2999 on my debit Mastercard (my daily withdrawal limit is $3K and I'm not sure if it was CRA or my bank who wouldn't allow a $3K payment). I still owe $125. I've tried at least 4 times this morning to submit the balance and the website keeps declining the transaction. It's not my bank - I was just at the grocery store and used my debit card without issue. The earliest date I can schedule a withdrawal for is May 8th, which is ridiculous as I shouldn't have to potentially incur interest when their website won't take my payment. I bank with Simplii, so I can't go into a branch, and I refuse to pay some third party to "allow" me to pay at Canada Post. Any tricks to get them to accept my payment through debit Mastercard? I'm certain it's not an issue of them only allowing one payment per 24 hours as I've made multiple payments on the same day in the past.