The Post recently reported that most homeowners in Montgomery County "will pay about the same or less in taxes this year" because of the Montgomery County Council's tax rate cut of 16 cents {front page, May 12}. This is untrue.

Although the tax rate has been cut, increases in assessments will mean higher taxes for the average homeowner. Homeowners in the third of the county that was reassessed this past year will pay on average 9 percent more in taxes. The third who were reassessed the previous year will pay 6.4 percent more. The third reassessed three years ago will pay an average of .4 percent more.

According to state figures, in Bethesda, Chevy Chase and Silver Spring areas reassessed this year, assessments rose an average of 71 percent. The previous year's average reassessment in northwestern Montgomery was 42 percent. In the eastern most part of Montgomery the average rise three years ago was 24 percent.

One third of any assessment rise is imposed each year. However, the State Assembly has imposed an emergency cap of 15 percent on assessments this year. Accordingly, the average assessment rise for the three areas mentioned is, respectively, 15 percent, 14 percent and 8 percent. This is balanced only partially by the 5 percent decrease in the average county tax rate from $3.16 to $3 per $100 taxable valuation. Another 1.6 percent decrease will occur this year because of a drop in the state's "growth factor" -- the percentage of market value that is taxable -- from 42.5 percent to 40.9 percent. NORMAN KNOPF Treasurer, Fairness in Taxation Bethesda