How is a loss on a primary residence treated in income taxes? Is is like any capital loss (limited), or can it be declared against ordinary income?

“How is a loss on a primary residence treated in income taxes?”--->You can’t deduct the loss on the sale of the primary residence;the loss of funds from the sale of your personal residence cannot be deducted as a personal loss. However, if the home is an investment property and is not your principal place of residence, then you may be able to claim the loss as an ordinary loss NOT a capital loss.
“ Is is like any capital loss (limited), or can it be declared against ordinary income?”---->No. As said above; it is NOT like other regular capital loss used first to offset capital gains and other income.