WOW I have that account but we have ONE account for our vacation fund. I had no idea you can have more accounts under one log in. I have to check this out.
Were you able to see how? If you click on the Summary tab it lists all of your accounts. At the bottom of the list it says something like "Add another Capital One account". Including kids accounts we now have around 14.
So whatever card/bill is at the top of your snowball, the payment comes out of the Capital One each month (or however often you pay)?? So if you are paying credit card X with the extra snowball money it is paid from the Capital One card acct? Your other debts that you pay min. on are coming out of a different checking acct?? Do you ONLY use the Capital Once card for the bill on the top of your list???
Here's how I've been paying down debt. It's a little long but stay with me....
Dh and I get paid biweekly on opposite weeks. So every week is pay day for one of us.
I created a Word document and I list each paycheck for the month (usually 4 of them) and each one's estimated amount. Beneath each paycheck, I list the bills to be paid with that check (based on their due dates) and planned transfers to savings. Not just debt but also water, electric, cushion for checking acct, etc. Anything leftover goes toward our SWA visa which is what we use for most purchases.
Our first bill that I attacked was our overdraft protection for our checking account. It wasn't the smallest balance but it was a ridiculous interest rate and the next 2 bills had 0% promotions and all 3 were roughly similar balances. I usually paid $25 biweekly with my pay to the OD protection. In the past I got no where doing this because I kept adding to the balance!
This time I scraped all I could and made a vow to never add to the balance. It was slow going but made progress. That first bill was the hardest!
Once that was paid off, I attacked the Sears bill. That was $25 min. paid on Week #2 each month. So on Week #2 I still paid the usual $25 Sears payment but then on my biweekly paychecks when I would have paid the OD protection payment in the past, I now sent those to Sears also, as if I were still paying the OD protection. I guess I could have just paid $75 to Sears as one payment but I'm a visual person and substituting an old bill with a new one was how I saw it. It also kept my checking account a bit more even keeled, no large up & down dips.
Then once the Sears bill was paid I moved on to the
Amazon bill. That min was $75, paid from Week #1 pay. Then on Week#2 when I would have paid the Sears bill, I now put that $25 to the Amazon bill. Then changed my biweekly $25 from Sears to Amazon. So Amazon was getting $150/month but I would send it as 4 separate payments, at the same time when the old bills were due. They don't mind as long as they get their min each month.
Then just keep going down the list of bills. Some weeks my snowball is less than $200. Some weeks it's $800. All of that $800 was once paid as a multiple smaller bills that are now $0!
I find this works
much easier if you pay your bills online, whether you pay through your bank's bill-pay feature or directly through your credit card's website. If I was making a single monthly payment by check and snail mail it wouldn't work for me. Also when I kept the font all black, my Word document started looking like a CF full of numbers so I color-coded each week. Purple for Week1 paycheck and bills, Orange for Week2 pay, Green for Week3, Blue for Week4. Then when we start a new month I copy and paste from the previous month and just change the dates to the new month. I keep the old stuff so I can refer back at any time.
This also makes it
really easy on those few times per year where we get 3 paychecks per month to designate them toward the snowball. (I make those red so they really stand out on the page!) Those paychecks have NO bills listed under them so unless I overspent on my regular monthly SWA card, it
all goes to the snowball.

I can only chuckle to myself when coworkers say it makes no difference whether there are 2 or 3 paychecks per month. I know for certain, if I'm diligent that 3rd pay can make a huge difference!
When you asked about using the Capital One checking acct here is what I used to do...
Whatever bills were paid off and now part of the snowball, I'd transfer those amounts to my Cap One checking just to get it out of our regular checking account. I'd schedule in advance for it to occur on payday so that it wouldn't be hanging around making our checking account look fat. Then I'd schedule the bill to pay from my Cap One checking.
After a while I realized it simply added another step of banking and added a couple days to when I can schedule a snowball payment.
Now, as an experienced snowballer, I can view my paystub online at work 2 days before payday, I then schedule bills to pay online the day before payday. Then on payday when I drink my morning coffee, I see that my paycheck went in and snowball payment went out. It's very satisfying & motivating.
Sorry this is so long but I cannot emphasize enough how easy it is to follow as long as I don't overspend with everyday expenses such as groceries, gas, occasional restaurant, etc.
Good luck and hope this helps.
