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IRS.gov Website
Publication 946
taxmap/pubs/p946-016.htm#en_us_publink1000299547

How Much Can You Deduct?(p29)

rule

Words you may need to know (see Glossary)

Figure the special depreciation allowance by multiplying the depreciable basis of qualified reuse and recycling property, qualified cellulosic biofuel plant property, qualified disaster assistance property, and certain qualified property acquired after December 31, 2007, by 50%.
For qualified property other than listed property, enter the special allowance on line 14 in Part II of Form 4562. For qualified property that is listed property, enter the special allowance on line 25 in Part V of Form 4562.
Tax Tip
If you place qualified property in service in a short tax year, you can take the full amount of a special depreciation allowance.
taxmap/pubs/p946-016.htm#en_us_publink1000299549

Depreciable basis.(p30)

rule
This is the property's cost or other basis multiplied by the percentage of business/investment use, reduced by the total amount of any credits and deductions allocable to the property.
The following are examples of some credits and deductions that reduce depreciable basis.
For additional credits and deductions that affect basis, see section 1016 of the Internal Revenue Code.
For information about how to determine the cost or other basis of property, see What Is the Basis of Your Depreciable Property in chapter 1. For a discussion of business/investment use, see Partial business or investment use under Property Used in Your Business or Income-Producing Activity in chapter 1.
taxmap/pubs/p946-016.htm#en_us_publink1000299615

Depreciating the remaining cost.(p30)

rule
After you figure your special depreciation allowance for your qualified property, you can use the remaining cost to figure your regular MACRS depreciation deduction (discussed in chapter 4. Therefore, you must reduce the depreciable basis of the property by the special depreciation allowance before figuring your regular MACRS depreciation deduction.
taxmap/pubs/p946-016.htm#en_us_publink1000299553

Example.(p30)

On November 1, 2013, Tom Brown bought and placed in service in his business qualified property that cost $450,000. He did not elect to claim a section 179 deduction. He deducts 50% of the cost ($225,000) as a special depreciation allowance for 2013. He uses the remaining $225,000 of cost to figure his regular MACRS depreciation deduction for 2013 and later years.
taxmap/pubs/p946-016.htm#en_us_publink1000299617

Like-kind exchanges and involuntary conversions.(p30)

rule
If you acquire qualified property in a like-kind exchange or involuntary conversion, the carryover basis of the acquired property is eligible for a special depreciation allowance. After you figure your special allowance, you can use the remaining carryover basis to figure your regular MACRS depreciation deduction. In the year you claim the allowance (the year you place in service the property received in the exchange or dispose of involuntarily converted property), you must reduce the carryover basis of the property by the allowance before figuring your regular MACRS depreciation deduction. See Figuring the Deduction for Property Acquired in a Nontaxable Exchange, in chapter 4 under How Is the Depreciation Deduction Figured. The excess basis (the part of the acquired property's basis that exceeds its carryover basis) is also eligible for a special depreciation allowance.