The Obama administration on Friday told about 800,000 taxpayers who purchased insurance policies via Healthcare.gov that they had been sent incorrect tax information. The affected individuals have been advised to hold off on filing their tax returns until the government sends them corrected data, which will likely arrive the first week of March. The incorrect forms included miscalculated “benchmark premiums,” officials said. Those premiums are reported so that taxpayers receive subsidies-as-tax-credits based on their projected income for 2014 and insurance coverage purchased. The mistake means some taxpayers will receive more credit help, while others will receive less than their first forms stated, officials said.