Initial amount.
Initial amount. The amount a taxpayer is at risk on the effective date with respect to an activity to which section 465 applies shall be determined in accordance with this section. The initial amount the taxpayer is at risk in the activity shall be the taxpayer's initial basis in the activity as modified by disregarding amounts described in section 465(b) (3) or (4) (relating generally to amounts protected against loss or borrowed from related persons).