(NatWest Group's compilation of forecasts included expected impairments of GBP943 million and an operating loss of GBP257 million for the second quarter. "NatWest Swung to 2Q Operating Pretax Loss After Higher-Than-Expected Impairment Charge," at 0619 GMT, incorrectly said that the bank was expected to report an impairment charge of GBP943,000 and an operating loss of GBP257,000. The correct version follows:)

By Sabela Ojea

NatWest Group PLC reported Friday a swing to a pretax loss for the second quarter of 2020 after booking much-higher-than-expected impairments for the period due to the coronavirus pandemic.

The U.K. bank posted a pretax loss of 1.29 billion pounds ($1.69 billion) for the quarter compared with a pretax profit of GBP1.68 billion for the same period a year earlier. It was expected to report an operating loss of GBP257 million for the period, according to the bank's compilation of forecasts.

The FTSE-100 lender's total income decreased to GBP2.68 billion from GBP4.08 billion for the second quarter of 2019. The bank was expected to report total income of GBP2.58 billion for the second quarter, according to its own compilation of consensus.

NatWest booked an impairment charge of GBP2.06 billion for the period, compared with the GBP943 million impairments the market expected, according to its compilation of forecasts. Full-year impairments are likely to be in the range of GBP3.5 billion and GBP4.5 billion, it noted.

The bank ended the period with a common equity Tier 1 ratio--a key measure of balance-sheet strength--of 17.2%, up from 16.2% as at Dec. 31, 2019.

Write to Sabela Ojea at sabela.ojea@wsj.com; @sabelaojeaguix