In this rising rate environment, I'm a fan of shorter-term T bills or money market funds. Savings accounts are too slow to keep up. I calculate my tax-equivalent yield (TEY) for Vanguard money market funds VMFXX or VUSXX to be around 4.5% now. I've got various T bills maturing between Feb and May with TEY of 4.6-5.1%.
Very short-term T-Bills are yielding over 4% right now, and are exempt from state and local taxes.
What are T-Bills?
Treasury Bills offered by the US government. They are available in maturities between 4 and 52 weeks. The 4, 8, 13, 17, and 26 week bills are auctioned every week. The 52 weeks bills are auctioned every 4 weeks.
You can buy at auction either directly at TreasuryDirect in $100 increments, or at most brokerages like Fidelity or Vanguard, usually in $1000 increments. You can AutoRoll your purchases at some brokerages like Fidelity or at TreasuryDirect, which means it'll automatically buy another bill of the same maturity when your existing one matures. Basically a rolling ladder and you can stop it at any time. Brokerages are preferred (in my opinion) since you can easily sell if you need the money before maturity. You can't sell at TreasuryDirect. You can transfer to a brokerage and then sell, but I wouldn't count on that being able to be done quickly.
T bills are very liquid. You can buy and sell on the secondary market, just like stocks. You can find daily rates here:
https://home.treasury.gov/resource-center/data-chart-center/interest-rates/TextViewYou'll want to use "Coupon Equivalent" to compare to a savings account or other investments. As mentioned, T bills are exempt from state and local taxes, so may give you an additional boost over regular savings as well. If you buy at auction, you won't know exactly what rate you'll get until after you buy it. But it'll probably be pretty close to the recent numbers posted here.