All "capitalist" economies have very large amounts of central planning for them to function (not to mention state subsidies and other protections from failing to make money), and use taxation and the national debt for that. Socialism plans centrally to the same extent that capitalist economies do, but also has the state owning the infrastructure that the economy relies upon. So it doesn't need to tax for that purpose. Socialism in that sense has never actually been practiced historically though, in the same way as there has never been "capitalism" in the sense of no central planning or regulation. Luckily.
"capitalists" have many central planners each planning the same thing but coming up with different results. Then we reward the ones who are right. Socialism features one planner - they may have helpers, but just one. If one planner gets it wrong in capitalism you can go with a different one.
