It's already pretty commonly stated Izaya has quite a few accounts to keep his money in Tokyo along with a few Swiss bank accounts, however, for this headcanon I believe he's made a few bank accounts for Mairu and Kururi along with an account the girls can access after they finish school as an incentive. I believe he regularly adds rather generous amounts of cash in to each account as a way of helping out the girls without putting them into danger by being close with them. He knows they want him close but is aware of what that would cause and just does what he can without being noticed.
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Book of Headcanons - Izaya Orihara
FanfictionMuch needed headcanons for the infamous information broker~!