With Republicans controlling the White House and Capitol Hill, Brady said there can't be any delay.
"We get a chance for tax reform once in a generation," the Texas Republican said on "Squawk Box," promising the lowest tax rates in "modern times."
President Donald Trump has also made tax cuts a top priority for his administration.
Trump and GOP leaders want Democrats to help chart the course for taxes, Brady said, but stressed Republicans are prepared to go it alone.
Under the banner "A Better Way Forward," Brady is leading the House effort to revamp the tax code.