By Jeannette Neumann 

MADRID-- Banco Santander SA, the euro zone's largest bank by market value, on Thursday reported a 38% rise in second-quarter net profit to EUR1.45 billion ($1.94 billion), boosted by gains at its U.K. and Spanish units and a big drop in bad debt provisions.

Santander said its second-quarter net interest income totaled EUR7.37 billion, roughly flat compared with the EUR7.34 billion the bank reported a year earlier.

Both those figures beat analysts' estimates.

Santander reported a big fall in provisions to cover losses on bad loans in the second-quarter compared with last year. The bank said the EUR2.64 billion in loan loss provisions it set aside was the lowest amount in more than two years.

The bank's second-quarter profit doesn't include net capital gains from recent asset sales, including the sale of 85% of its real estate service. Those gains have been set aside to cover restructuring and technology costs, the bank said, and to bolster provisions against U.K. clients' claims regarding the wrongful sale of payment protection insurance, or PPI.

Net profit from Santander's U.K. unit was EUR775 million in the six months to June 30, up 59% from a year earlier. The unit is run by Chairman Emilio Botín's daughter, Ana Patricia Botín, and is among the biggest contributors to the bank's overall results. A long-awaited initial public offering of the U.K. unit won't happen this year or next, Chief Executive Javier Marín told journalists Thursday. "We're not there yet," he said.

Santander's Brazil unit, which vies with the U.K. subsidiary for top-profit driver, posted net profit of EUR758 million in the first six months of this year, a decline of 18% compared with the same period a year ago.

Brazil, once a counterweight to Santander's crisis-stricken Spanish market, has seen sluggish growth in recent quarters. The International Monetary Fund on July 24 cut its 2014 forecast for Brazil's annual growth to 1.3% from 1.9%.

Santander in April offered to buy out the 25% of its Brazil unit that it doesn't currently own, a deal that could be worth EUR4.7 billion and which the bank expects to close in October.

Santander's results showed its Spanish unit is on the upswing, in line with second-quarter earnings reported by domestic peers.

The Spanish bank posted net profit of EUR513 million in the first six months to June 30, a surge of 79% from a year earlier. The unit also posted gains from the first quarter to the second.

The gains come as Spain on Wednesday said its economic growth was 0.6% in the second quarter from the previous quarter the fastest growth in six years. The increase beat economists' forecasts and makes Spain one of the strongest performers in the euro zone but came as consumer prices fell slightly in July from a year earlier, strengthening the specter of deflation in the country.

The IMF expects Spain's economy to grow by 1.2% this year, roughly on par with Brazil.

Santander said its subsidiary in Argentina posted a second-quarter net profit of EUR79 million, up 42% from the first quarter. The Spanish lender said it opened nine bank branches in the country in the second quarter and has a 10% share of loans and deposits. Mr. Marín said he expected no major impact on Santander from a potential default by the country.

Santander reiterated Thursday it plans to have a core capital ratio of 9% by the end of 2014 under the latest regulations. The bank doesn't disclose that ratio quarterly.

Exane BNP Paribas analyst Santiago López Díaz expects the ratio to be 8.9% at year-end, below the 11.2% he expects for European banks on average.

A lower capital level means a bank has less of a buffer against losses.

Write to Jeannette Neumann at jeannette.neumann@wsj.com

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