A mayor can't just "raise taxes", it has to go through the state legislature, and it doesn't seem like he has support for it there because it'll fuck up the state budgets too if he drives people into Ct or Jersey.
Federal tax- 37%
NY State Tax- 10.9%
NY city tax- 3.9%, Mamdani wants 5.9%
Social Security and Medicare tax for self-employed- 15.3%, plus another 0.9%
Federal Corporate Tax-21%
NY corporate tax rate-7.25%, Mamdana wants to make it 11%
Property Tax- based on property, about another $20-30k
State Sales Tax-4%
City Sales Tax-4.5%
MCTD surcharge-0.375%
Yeah, I'm sure everybody with money is thinking "well I could just leave the city and buy a nice house with a yard an commute, or I could give the already highest taxed state and local area in the country another few hundred thousand every year to ride a public bus full of hobos and drug addicts".