THE tax chief yesterday rejected criticism that the Government had failed to assess revenue accurately. The Government collected $93.7 billion in 1999-2000, $4.1 billion more than Financial Secretary Donald Tsang Yam-kuen's estimate in March. Acting Commissioner of Inland Revenue Agnes Sin Law Yuk-lin attributed the increase to the booming economy and increased revenue from stamp duty. Meanwhile, Mrs Sin admitted that the credibility of tax assessors had been undermined because of the scandal involving former chief Wong Ho-sang. Mr Wong was sacked after he failed to declare a stake in his wife's taxation services company. The department had increased the number of officials brought under the declaration system - under which they declare their financial interests - from 37 to 75.