Are my nyc and 457 plan pensions taxable after I retire

If the pension is paid by NY state or NY local government, or by the federal government (including social, security) it is not taxed by NY. The first $20K of your 457 plan withdrawals are also not taxed. See: Information for seniors (http://www.tax.state.ny.us/pit/income_tax/information_for_seniors.htm)