Mid-quarter convention
(11) Mid-quarter convention. In determining whether the mid-quarter convention applies for a taxable year under section 168(d)(3) and 1.168(d)-1, the depreciable basis, as defined in 1.168(d)-1(b)(4), for the taxable year the qualified property is placed in service by the taxpayer is not reduced by the allowed or allowable additional first year depreciation deduction for that taxable year. See 1.168(d)-1(b)(4).