http://www.investopedia.com/terms/d/deferredtaxasset.asp
What Does Deferred Tax Asset Mean?
An asset on a company's balance sheet that may be used to reduce any subsequent period's income tax expense. Deferred tax assets can arise due to net loss carryovers, which are only recorded as assets if it is deemed more likely than not that the asset will be used in future fiscal periods.

www.ec.europa.eu/internal_market/bank/doc...
Deferred tax assets (DTA)
The presentation by Maurizio Cravero, Unicredit, was followed by the following comments:
Deduction of DTAs could be justified by the uncertainty of future profitability. Different tax
systems create an unlevel playing field. A proposal that could create unlevel playing field at
global level should not be proposed in the EU.
The increase in DTA in the past years reflects the fragile economic situations.
Rating agencies supposedly adjust capital for DTA, as it would limit loss absorbent potential.
There are tax, accounting and supervision differences within the EU (Spain, Italy).
Certain types of DTA such as timing differences should be given some value.
Possibilities include application of risk weighting to DTA or deduction over a certain
threshold, taking as an example the US treatment.
Simple haircut rule as starting point can be considered.
The CRD talks about contingent claims without definition.
There is a range of different types of DTA (some are closer to capital, other farther), which
can be treated differently.

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