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Should we park our money in our escrow account?
The likely outcome of adding extra money to your escrow account is that the bank will send you a check for excess funds at the end of the year (or whenever your property tax and insurance payments are processed). Could you just redeposit that money immediately? Possibly. I bet most banks wouldn't care and would just follow the routine of clearing the excess from the account next time they process payments. I've never received a 1099 for interest in an escrow account. It is possible that when you start earning enough interest that a 1099 is required by law ($10/year) that the bank gets a little more aggressive about pushing your money back to you. I'm not sure why that hassle is any better than just opening up your average internet savings account (many don't have any of the fees you mentioned) and parking it there with a similar interest rate. You can deposit and withdraw using ACH transactions that post by the next business day. That said, unless they do start rejecting your money, there aren't a lot of downsides in your plan.