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Transfer $70k from Wells Fargo (US) to my other account at a Credit Union bank
Yes, you can do this.  I do this for my own single-member LLC, but I usually do it online instead of writing a check. Your only legal obligation is to pay quarterly estimated tax payments to the IRS. I'm assuming you are not otherwise doing anything shady. For example, that you have funds in your business account to pay any expenses that will be due soon or that you are trying to somehow pull a fast one on someone else...