Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Transfer $50k to another person's account (in California, USA)
A non-cash transaction will not be a problem. The bank will have to fill out federal paperwork if there are large amounts of cash involved.  This is to stop the underground economy.  This can even extend to non-banks. If you were to walk into a car dealer or some other stores and hand them a bag  of cash they will also report it. You can do what you propose without having to transfer any money between accounts. Your girlfriend can put the furniture and landscaping on her credit card, or write checks to the stores or companies. Based on the number of questions on this site regarding how to transfer funds between banks and accounts, the mechanics of the transfer is the hard part. Resist the urge to use cash to make the transfer. That will require paperwork. Many people find that the old standard of using checks to transfer funds is easy, safe and quick.