Getting an extra two days to file taxes beyond the usual April 15 tax filing deadline isn’t likely to cure a nation of procrastinators this year. Tens of millions of us routinely wait until just before the deadline to file returns. More than 30 percent of taxpayers filed the week before Tax Day or later via extensions in 2011, and Internal Revenue Service statistics show the pace is similar this year. Perhaps working under deadline pressure helps you focus better on the task at hand. But procrastinating may come at a price. “The amount of work that’s going to need to be done at the last minute is no less just because you’ve waited, and the potential for errors is greater,’’ says Suzanne Shier, a tax strategist