If you have more than $250k use a brokerage account, with linked checking account. And hold a simple laddered t-bill portfolio in the brokerage account, you get

If you have more than $250k use a brokerage account, with linked checking account. And hold a simple laddered t-bill portfolio in the brokerage account, you get the $250k fdic insurance on the bank account portion, the sipc on the brokerage portion + excess of sipc insurance coverage (you have to research this, but should cover all but the biggest institutions) + asset segregation (you ostensibly own the bonds and they should not be co mingled). E*trade example below https://us.etrade.com/l/f/asset-protection https://us.etrade.com/l/f/asset-protection