William O. Douglas,
Virginian Hotel Corporation of Lynchburg v…
“ But we find no suggestion that 'allowed', as distinguished from 'allowable', depreciation is confined to those deductions which result in tax benefits. 'Allowed' connotes a grant. Under our federal tax system there is no machinery for formal allowances of deductions from gross income. Deductions stand if the Commissioner takes no steps to challenge them. Income tax returns entail numerous deductions. If the deductions are not challenged, they certainly are 'allowed' since tax liability is the determined on the basis of the returns. ”
