Tax revenue in July rose 3.6 percent from a year earlier to 4.615 trillion yen, the Finance Ministry said Monday.
The rise was attributed mainly to income tax on a large volume of maturing long-term postal savings.
Income tax revenue increased 3.6 percent to 3.322 trillion yen as revenues from withholding tax grew 3.7 percent to 2.874 trillion yen and those from declared income tax increased 3.5 percent to 448.26 billion yen.
The increase stems from a 20 percent tax on the interest income from maturing long-term postal savings with relatively high yields, a ministry official said.
Corporate tax receipts came to 60.24 billion yen, compared with a deficit of 19.11 billion yen a year earlier stemming from tax refunds.
Revenue from April 1 to the end of July came to 8.304 trillion yen, up 5.7 percent. from the same period last year.
Vice Finance Minister Toshiro Muto said last week that tax revenue for the current fiscal year may be lower than the government's estimate of 50.73 trillion yen due to the economic slump.
Major corporations, notably those in sectors related to information technology, are expected to report dismal half-year earnings, which would result in lower corporate tax receipts.