Checking account drag
How much does idle checking cost? $650
Using a $15,000 example, 0.07% APY earns $11 per year while 4.40% earns $660.
Bottom line
Checking account drag is worth fixing when the cash is not needed for daily bills.
Keep enough in checking for near-term transactions, then move surplus cash into a liquid, insured account or a deliberate cash ladder.
Next calculation
Taxes can change the HYSA vs T-bill winner.
If the cash is taxable and your state income tax rate is meaningful, compare after-tax yields before deciding between HYSA and Treasury bills.