By Devlin Barrett, David Enrich and Christopher M. Matthews 

The U.S. Justice Department is pushing BNP Paribas SA to pay more than $10 billion to resolve a criminal probe into allegations it evaded U.S. sanctions against Iran and other countries for years, which would represent one of the largest penalties ever imposed on a bank, according to people familiar with the negotiations.

A final resolution of the yearslong investigation of the French bank is likely weeks away, and it's possible the ultimate settlement amount could total far less than $10 billion. BNP is looking to pay less than $8 billion, according to the people familiar with the settlement discussions, although a person close to the bank said its negotiators have never mentioned the $8 billion figure in talks with U.S. authorities.

BNP and the U.S. authorities also remain locked in negotiations over whether the bank will temporarily lose the ability to transfer money into and out of the U.S., the people said.

Prosecutors are continuing to try and extract a guilty plea from the bank and, in recent negotiations, have pointed to the muted market reaction in the wake of Credit Suisse AG's admission to conspiring to aid tax evasion as evidence that a guilty plea by BNP would not be disastrous, according to a person familiar with prosecutors' thinking.

But the bank's ability to process dollar transactions has emerged as a sticking point in recent days, according to several people familiar with the discussions. Benjamin Lawsky, who heads New York's Department of Financial Services, has suggested a temporary suspension of its ability to clear U.S. dollar transactions be included in a final settlement, a person familiar with the matter has said.

BNP executives are concerned over the possibility the U.S. will temporarily restrict the bank's ability to transact in U.S. dollars, according to a person familiar with the bank's thinking. BNP has multiple businesses--including its investment bank, a corporate-finance unit and a trade-finance operation--that do many of their transactions in dollars.

In negotiations with the U.S., BNP executives and their lawyers have warned that their corporate clients and Wall Street trading partners have expressed anxiety to BNP about the possible dollar-transacting restrictions, according to people familiar with the discussions. BNP officials have warned the U.S. authorities that imposing such restrictions, even temporarily, could potentially destabilize the bank, these people said.

Officials from the Justice Department, the Manhattan U.S. Attorney's office and the Manhattan District Attorney have all participated in the negotiations.

BNP and prosecutors haven't come to terms on the size of the financial penalties the bank will ultimately pay. Prosecutors are pushing BNP to pay more than $10 billion and have expressed the view that the volume of the transactions BNP allegedly processed in violation of U.S. sanctions against Iran and other countries could actually warrant an even larger penalty and that the bank is already, in effect, getting a discount.

The tab for settling the case has rapidly ballooned. In February, BNP announced that it was setting aside $1.1 billion to cover the expected settlement. At the time, analysts regarded it as a surprisingly large sum. Two months later, BNP warned that "there is the possibility that the amount of the fines could be far in excess" of what the bank previously had set aside.

BNP has previously said that its internal investigation into the matter uncovered "a significant volume of transactions" from 2002 to 2009 that could be "considered impermissible under U.S. laws and regulations" related to sanctions.

In recent conversations with investors and clients, BNP Paribas officials have tried to assuage their concerns about a potentially large financial penalty, according to the person familiar with the bank's thinking.

They have pointed out that BNP had about EUR90 billion (about $122.5 billion) of shareholders' equity at the end of March, so it could easily absorb a multibillion-dollar legal settlement, this person said. The bank's ratio of equity capital to risk-adjusted assets, a key measure of its ability to absorb future losses, stood at 10.6% on March 31, well above regulatory minimums.

In addition, BNP officials have told investors and clients that as soon as the settlement is completed, the bank can raise billions of dollars in debt via a public bond offering, this person said. BNP executives were heartened by Credit Suisse's ability earlier this month to issue about $5 billion of debt a few days after pleading guilty to U.S. tax-evasion charges and paying $2.6 billion to settle the case.

Andrew Grossman and Andrew R. Johnson contributed to this article.

Write to Devlin Barrett at devlin.barrett@wsj.com, David Enrich at david.enrich@wsj.com and Christopher M. Matthews at christopher.matthews@wsj.com

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