Treasury Bills + State Income Tax Exemption = 6%+ Effective APY (October 2023)

I’ve mentioned this before, but here’s a quick reminder as the tax-equivalent yields are now at 6% APY in most states with income taxes (anything 5% and up, see above graphic). Due especially to high state income taxes, my cash is mostly held in Treasury bills and money market funds that contain 90%+ treasury bills. Both can be owned within most major brokerage accounts that allow the purchase of individual bonds from either auction or secondary markets. (Treasury Direct allows purchase at auction, but I don’t like the user interface or customer service.)

So while I enjoy keeping track of new fintech apps, unless there is a good upfront bonus, it’s hard for me to justify another application at current rates. I skipped Milli when it hit 5.25% APY in August 2023. I skipped Elevault when it hit 5.50% APY in October 2023. I will likely skip Domain Money at 6% APY.

Treasury bond interest is exempt from state incomes taxes, which gives them a comparative boost over interest from banks. If you are subject to state income taxes, use a tax-equivalent yield calculator to compare Treasury bill/bond yields with interest rates from bank accounts and other bonds.

For example, if you are single with $70,000+ taxable income in California, your marginal state income tax rate is at least 9.3%. That means the 5.57% interest from a 4-week Treasury bill is equivalent to a bank account paying 6.42% interest or higher!

Treasury Bills + State Income Tax Exemption = 6%+ Effective APY (October 2023)

Be sure to check and make sure your “Treasury” money market fund is holding 90%+ Treasuries and not repurchase agreements. I’ve noticed that Vanguard Treasury Money Market Fund is now back to 94% Treasuries and only 4% repos, but that could change again in the future, so I’m keeping an eye on it.

Finally, at tax time be sure to look up the appropriate U.S. government obligations income information and use it when filing your state income taxes. You may need to nudge your accountant along with supplying this information.

[Top image credit – Wikipedia]

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Treasury Bills + State Income Tax Exemption = 6%+ Effective APY (October 2023) from My Money Blog.