ven if President Obama and Republicans in Congress can reach a last-minute compromise that averts some tax increases before today's deadline, experts still foresee a significant drag on the economy in the first half of 2013 from the fiscal impasse in Washington, D.C., the New York Times reported today. While negotiators in the capital focus on keeping Bush-era tax rates in place for all but the wealthiest Americans, other tax increases are expected to go into effect regardless of what happens in the coming days. For example, a two percentage point jump in payroll taxes for Social Security is all but certain after Jan. 1, a change that will equal an additional $2,000 from the paycheck of a worker earning $100,000 a year. Many observers initially expected the lower payroll-tax deduction rate of 4.2 percent to be preserved. But in recent weeks, as it became clear that political leaders were prepared to let that rate rise to 6.2 percent, economists reduced their predictions for growth in the first quarter accordingly.