The phrase "for regular tax purposes" is a legal term that refers to the standards and rules set by the government for calculating, assessing, and collecting taxes. Full definition
Income from municipal bonds usually isn't taxable for regular tax purposes. (hrblock.com)
So, you might have to add back amounts you deducted for regular tax purposes, like personal exemptions. (hrblock.com)
Line 9: Depletion: You can calculate depletion from mining, oil, gas, timber or other similar activities for regular tax purposes using either the cost or percentage depletion method. (turbotax.intuit.com)