evidence: Harris on Trump raising prices for families by $4,000 a year Harris claimed in her Thursday speech at the Democratic National Convention that Trump’s proposed policies would raise prices for American families. "He intends to enact what, in effect, is a national sales tax, call it a ‘Trump Tax,’ that would raise prices on middle-class families by almost $4,000 a year," she said. [...] Separate studies estimate that the impact of Trump’s proposed tariffs would also raise prices for families, but by a lower amount. The Peterson Institute for International Economics estimated the new duties would cost the average middle-class household about $1,700 annually. And the Tax Policy Center said the impact could be $1,350 a year for middle-income households.