I saw 6 month T Bills are paying 4.88% APR. I think you can do better and be very liquid if you split your cash into $100K or smaller chunks and invest in top FDIC insured savings accounts. You will average above 5%. I can assure you FDIC is very prompt in repaying deposits in failed banks. You can consider them same as T Bills. Using the FDIC cover, I think you can expose yourself to higher risk and get better return. If you win, you keep. If you lose, FDIC makes you whole. What is there to complain?