What has happened to these under the new law: Personal Service Corporations.  It appears this should now be defunct.  The entire idea was to eliminate the lower tax bracket for professionals who used the corporation for little other than personal services.  I understand there is no longer a lower bracket for a C corp, all income is taxed at 21%  i.e. If taxable income is one dollar, the tax is now 21 cents. Personal Holding Corporations.  Don't know about the future of this.  The