DA has been a place where people have shared lots of information and good ideas, so let's make this an Add-On thread for people to post their smart (perhaps not obvious) methods, or things they do, when dealing with Banks/CUs and CDs/Savings Accts.
I'll start...
(1)
When you want to open a CD, if possible, instead of just opening the one CD, it's a good idea to split those funds into smaller CDs (w/the same maturity date) instead. The reason is, if you ever need to take an early withdrawal (and you can never predict life), not all Banks/CUs will let you take a partial early withdrawal -- in which case you'd be forced to close the entire CD early -- and pay the penalty on the entire amount of the CD instead of something closer to what you need. Plus, while there are places that currently say they allow partial withdrawals, history has shown that institutions can change their rules and try to enforce those changes, even for CDs opened before the rules change. By splitting your CD into multiple parts it's great "insurance just in case" that doesn't cost you anything but an extra 2 minutes on the phone.
So if you're about to open a CD for $430k, instead of one $430k CD, open up something like three $100k CDs and one $130k one. Your rate of return will be the same, and if an emergency comes up (say you need $76k), you can just close one, and won't be stuck being forced to close the entire $430k -- and pay the penalty on the entire $430k. And not just for Jumbos either. Anything over $30k or so I think is a good idea to split.
(2)
For those who have accounts at a lot of banks/CUs: Just about every place has a "dormant account" fee, and it can be impossible to remember to do a transaction at each of them in the manner and timeframe to satisfy the terms at each one before they start charging you a "dormant account" fee. So an easy alternative: at one of your places, set up automated ACHs into each of the savings accounts of the places you deal with, to send a couple pennies every 6 months. Set it and forget it. No dormant account fees that way, and if you really want your pennies back you can always get them back at any time.
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Feel free to post other good suggestions in dealing with banks/CUs/CDs/Savings Accounts!