A 5% CD and a 5% T-bill are not the same paycheck.
Treasury bill interest is generally exempt from state income tax. Bank interest is not. RungRate turns that rule — plus dated yield snapshots — into numbers you can check against 31 U.S.C. § 3124 and your own 1099s.
Open after-tax comparator · Current bill yields · Sources
How to use RungRate
- Open your state page to see whether interest is taxed and at what table rate.
- Compare bank vs bill cash with the after-tax yield tool.
- If you need scheduled liquidity, build rungs in the ladder builder and pick tenors.
What you can do here that generic “APY lists” skip
- State-by-state after-tax ranking of T-bill vs CD vs HYSA using your federal marginal rate and the state top rate table we publish.
- Dated inputs — Treasury investment rates and FDIC national averages with as-of stamps, not undated blog claims.
- Ladder construction — equal rungs, auto-roll sketch, emergency-fund liquidity tiers.
Start with the decision you actually have
“Is the higher CD still higher after tax?”
Pick your state. Enter the three yields. See dollars/year side by side.
“How do I stagger maturities?”
Split principal across 4–52 week style rungs and estimate interest per rung.
“What taxable yield matches this bill?”
Tax-equivalent yield for the state exemption edge only.
Data, not slogans
Every table page lists sources next to the grid. Defaults in tools are editable because your brokerage screen is the authority on your trade.