i'm not completely familiar with the business version of the software. entering it in 2024, Turbotax knows that 40% or more was added in the 4th quarter. it cannot be sure of prior years if they weren't done use the app because it has no way of knowing if there were other assets that were added and then taken out of service that would negate the mid-quarter convention so by default it selects HY
in the desktop 1040 version you can go into forms mode and switch from HY to MQ (line 48)
don't know if forms mode is available in the business app but since it is a desktop app I would think so.
i did test using the 1040 app and entered 90.42% as depreciation through year 5 (2023) as per IRS tables (MQ 4TH quarter) but left the HY convention. Turbotax correctly computed year 6 (2024) depreciation as 9.58% though the depreciation report, that is not submitted to the IRS, showed 200DB/HY
switching line 48 to MQ only changed the depreciation report to show 200DB/MQ
