Ok info but, for me, the managing of multiple cards is more about managing for maximizing rewards. lol. 
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lol yep! Managing multiple cards for me = knowing what to use for which purchase to maximize the CB rate, especially keeping a mental note of which places don't code the way you'd expect them to.
I use a spreadsheet program and a dry erase board with statement cut/due dates, last payment made date, balance and credit line. 5% rotators get updated on the dry erase as well.
@CorpCrMgr1 wrote:Thank you for sharing. I've often wondered of the time and resources some posters with 40 CC manage that many cards?
Some of my 20 cards have been sock drawed until they are cancelled.
I'm not quite at 40, but I'm on my way so I'll give my two cents 
My spreadsheet helps plan payments, with cards listed by due date. I am paid biweekly and make payments every payday. I put my spreadsheet on my smaller monitor and on my larger monitor I CTRL + click a folder with bookmarks to every issuer's log-in pages. I then work left to right, signing in to each account (credentials saved). I then work left to right again, updating my spreadsheet with balances / payments due as I go, closing tabs with no payments due. I make sure everything is good on my spreadsheet before making the payments, then go left to right again to make the payments.
This may sound like a lot but in practice takes about 5-10 minutes every two weeks for 30 cards.
P2 
Chopped 
