The objective of the study was to evaluate the profitability of starchy potato cultivation on an agricultural holding in the years 2010-2012. Empirical data was obtained from the owner of the farm who has signed a longterm contract and cooperated with the food industry enterprise ‘PEPEES’ in Łomża. The highest marketable yield of starchy tubers was recorded in 2011. The production value per 1 ha varied in individual years and ranged from 6,002.0 to 10,649.6 PLN. The income was highly variable in individual years depending on the yield level and the price per produced unit. Direct costs affected the economic effectiveness of starchy potato cultivation, too. Seed potato and fuel costs accounted for the greatest proportion of the total costs. Starchy potato production was the most profitable in 2011.