DeWitt Corporation reported pretax book income of $800,000. Tax depreciation exceeded boo depreciation by $400,000. In addition, the company received $100,000 of tax-exempt municipal bond interest. DeWitt used a net operating loss carryover of $200,000 to offset taxable income in the current year. Compute DeWitt's book equivalent of taxable income. Use this number to compute DeWitt's total income tax provision or benefit for the current year, assuming a tax rate of 34%.