I assume these are probably simple questions for someone who knows how but reading the instructions for depreciating business property in Publication 4562 is giving me a headache.
QUESTION ONE: CALCULATING DEPRECIATION
I have a small business for which I have a small amount of depreciable property (computer, cell phone, furniture, etc.). I am using the S/L depreciation method and the mid-quarter (MQ) convention. I am having trouble figuring out the calculations for depreciation. As a simple example:
If I had an item with $100 basis placed in service the last quarter of the first year of use and depreciable over 5 years, I assume the calculations look somewhat like this:
Year 1 rate = 0.125, Depreciation = $12.50 Year 2 rate = 1/(5-0.125), Depreciation = rate*(100-12.50) = $17.95 Year 3 rate = 1/(5-1-0.125), Depreciation = rate*(100-12.50-17.95) $17.95 Year 4 rate = 1/(5-2-0.125), Depreciation rate*(100-12.50-17.95-17.95) = $17.95 Year 5 rate = 1/(5-3-0.125), Depreciation rate*(100-12.50-17.95-17.95-17.95) = $17.95 Year 6 rate = ???
I assume there is some fractional calculation for year 6 so that you can depreciate the full total value of the basis but for the life of me I can't figure out what the calculation is. If I follow the pattern and use rate=(1/5-4-0.125) and multiply that by the remaining basis I get $17.95 depreciation which would result in total depreciation of $102, which is more than the basis! I know by simple addition that the answer should probably be $15.70 but I have no idea how mathematically you get there other than to add up the accumulated depreciation and subtract it from the original basis.
QUESTION TWO: DISPOSING OF DEPRECIABLE PROPERTY
Now, assume the $100 item referenced above breaks in the second quarter of year 3 and has no saleable value. What happens to the depreciation calculations? Do you write off all the rest of the item's value in the year it breaks?
Example: Year 1 Depreciation = $12.50 Year 2 Depreciation = $17.95 Year 3 Depreciation = $69.55
OR
Do you depreciate only to the point where the item had usable value and then lose any remaining depreciation?
Example: Year 1 Depreciation = $12.50 Year 2 Depreciation = $17.95 Year 3 Depreciation = 0.375*$17.95 = $6.73 (remaining depreciation value of $62.82 is "lost")
Thank you for any help on this complex question!