Many investors are concerned about higher tax rates, but Commonwealth CIO Brad McMillan says he's not worried (yet). : With many debating what the new tax bill might entail, investors are starting to worry. Perhaps the biggest fear is that the new tax law will include higher tax rates that could derail the economic recovery and the market. It’s been argued that it will hurt confidence, take money out of consumer and business spending and investment, and maybe even take us back to a state of depression.