Try this:
First know that these items arise due to the differences in accounting methods used to complete the financial statements, and the accounting methods used to actually file a tax return with the IRS. For example, on a given PPE asset item, for IRS reporting we may assume a depreciation schedule of: 50% 35% 15% and no salvage value. On the other hand for financial reporting, we may simply use a straight line depreciation of: 33% 33% and 33%. You can illustrate this on a spread sheet very simply in about 5 minutes to see how it works.
Here’s a simple example using the above numbers;
Equipment original cost = $100 ** Revenue = $250 ** Tax rate = 30% (assume no other expenses)
IRS reporting YR1 YR2 YR3
Revenue 250 250 250
Depreciation exp 50 35 15
EBT 200 215 235
Taxes owed/paid 60 64.5 70.5
Financial Reporting
Revenue 250 250 250
Depreciation exp 33.3 33.3 33.4
EBT 216.7 216.7 216.6
Income tax prov. 65.01 65.01 64.98
*Notice in YR 1, we paid less in taxes to the IRS than what we show as our income tax provision on our income stmt. This means we will eventually have to pay out MORE in taxes in the future than what our income statement will show because these differences work out to 0. As a result, this company would record a deferred tax liability in YR 1 of (65.01 - 60) 5.01.
In YR 2, we paid slightly less still, and would add to our deferred tax liability, which at end of yr 2 would be (5.01 + (65.01 - 64.5)) 5.52.
In YR3, the final year of our asset, notice we actually pay the IRS MORE than what we record on our income stmt. A difference of (70.5 - 64.98) = 5.52. This would reduce our deferred tax liability back to 0.
The important concept to know is that they result because of a difference in depreciation schedules used by the IRS vs. FASB. Further note that the differences are temporary and will work out to 0 in the end, so if you actually pay less in taxes than what you say you paid, you will eventually have to pay more than what you say you paid (liability).
Hope this helps.
Donnie