I wouldn't say this is a better strategy, but you can definitely min/max this even if your income is not stable by extrapolating out your expected income and expected witholding a few times a year and adjusting your W-4 based on your calculations.
You may think this situation is still irrational, that the other person is being irrational. But again, there are many life situations out there. Perhaps they have lived in situations where they had to fight for what they needed. Perhaps they lived with an earner who would spend their money on drugs if it wasn't taken away, and yet if the non-earner saved it up themselves, the earner would find it and spend it.
The supposedly rational thing may depend on everyone around you to also be rational, and everyone around them, etc. And given that we are human, and humans are not fully rational...
Fill it out correctly and your employers will do the right thing.
https://www.ecfr.gov/current/title-26/part-31#p-31.3121(a)(1...
$100 isn’t nothing but it’s not everything either.
Where N is some value between like .... 30 and 90? I forget.
But they only pay that if they don’t return it that year (for normal W-2 employees).
Last time I looked, you needed to be in a higher tax bracket than I was to make Muni bonds worth it, in part because my state (WA) does not have income tax. Something like the 35% bracket.
And anyway, my investment strategy is not long bonds at this point in my life.