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How can Schwab afford to refund all my ATM fees?
I am using my debit card regularly: in ATM's with a pin, in stores with my signature, and online. But later you say  But from what I recall from starting my own business (a LONG time ago), for debit cards there's only a per-transaction fee of like $0.25, not a percentage cut. Only pin transactions have just a per-transaction fee paid by you to the merchant (and you are reimbursed by Schwab).  If you use your card with just a signature or online without a pin, then it is a credit transaction from the merchant's perspective.  The merchant pays a fee and Schwab gets its cut of that.  So for two of the transaction types that you describe, the merchant pays Schwab (indirectly) out of your payment.  Only when you enter your pin does it process as a debit transaction where Schwab pays the merchant.   Because check cards withdraw the money from your account immediately, you don't even get the twenty to fifty day grace period.  So those merchant fees are pure profit for Schwab, offsetting the loss from the ATM fees.   You claim $4-5k in fees at $.25 each.  That's sixteen to twenty thousand transactions.  Assuming that several is four to five years, that's more than ten transactions a day.  That seems like a lot.  I can see three for meals, one for miscellaneous, and maybe some shopping.  But if I go shopping one day, I don't normally go again for a while.  I have trouble seeing a consistent average of five or more transactions a day.   Even if we use just the higher ATM fees (e.g. $2), that's still more than a transaction a day.  That's an extreme level of usage, particularly for someone who also makes frequent purchases via card.   I haven't done any other business with them. I find this confusing.  How does money get into your account?  At some point, you must have deposited money into the account.  You can't debit from an account without a positive balance.  So you must have done or be doing some kind of business with them.  If nothing else, they can invest the balance that you deposit.  Note that they make a profit off such investments.  They share some of that profit with you in the form of interest, but not that much really.   Of course, Schwab may still be losing money on your transactions.  We can't really tell without more information on how much of each transaction type you do and how much of a balance you maintain.  Perhaps they are hoping that you will do other, more profitable, activities in the future.   I doubt there are that many Schwab customers like you describe yourself.  As best I've been able to see, they advertise their banking services just to investment customers.  So it's unlikely that many customers who don't use their investment services use their banking services just for ATM reimbursements.