Europe is introducing a globally agreed set of capital rules that incorporate lessons from the financial crisis of 2007-09, when taxpayers had to bail out several lenders.

JP Morgan's analysis showed 13 out of 35 banks may fail to meet minimum capital needs, with regulators' harmonization efforts likely to reduce average common equity tier 1 ratio for the sector from 14 percent to 12.1 percent in 2018.

The capital rules, that are being phased in through to 2019, will end the bulk of the waivers that some national regulators allow, making it harder for investors to compare banks.

The harmonization efforts will likely have a capital equivalent impact of 137 billion euros (99.48 billion pounds) on European banks, with an estimated shortfall of 26 billion euros of common equity tier 1 capital, JP Morgan said.

The bulk of the shortfall is likely to be faced by Raiffeisen Bank (>> Raiffeisen Bank International AG), Credit Agricole SA (>> CREDIT AGRICOLE), UniCredit Spa (>> UniCredit SpA), Societe Generale (>> SOCIETE GENERALE), Banco Santander (>> Banco Santander, S.A.) and Natixis (>> Natixis), JP Morgan said.

Credit Agricole, SocGen and Santander are most likely to cut dividend to address the capital shortfall, JP Morgan analysts said. Others are likely to reduce risk weighted assets and lower leverage exposure.

Only Raffeisen Bank, with a capital shortfall of 1 billion euros, would still face the risk of dilution while the rest may be able to bridge the gap, the analysts added.

The brokerage upgraded Commerzbank AG (>> Commerzbank AG) to "overweight" from "neutral", saying the German bank should continue to benefit from the European Central Bank's ongoing Quantitative Easing-led asset revaluation in its non-core assets portfolio.

JP Morgan's top picks portfolio includes UBS AG (>> UBS), Deutsche Bank AG (>> Deutsche Bank AG), Commerzbank, Lloyds Banking Group (>> Lloyds Banking Group PLC), Danske Bank (>> Danske Bank A/S) and Nordea Bank (>> Nordea Bank AB).

(Reporting by Tenzin Pema in Bengaluru; Editing by Anupama Dwivedi)