This marks the first time since February 2015 that actual budget revenue has fallen short of estimates.
The central government's budget revenue for the five months came in at 2.684 billion euros, 32.6 million euros, or 1.2 percent, below the target for the period, but up by 90.7 million euros, or 3.5 percent, from a year ago.
The value-added tax brought 1.488 billion euros into the state's coffers, some 1.7 percent less than planned. Excise tax revenue totaled 547.6 million euros, 1.2 percent below the estimate. Revenue from the corporate income tax, at 110.1 million euros, fell 10.8 percent short of the target.
Year-on-year, revenue from these taxes increased by 3.7 percent, 3.3 percent and 12.1 percent, respectively.
The personal income tax generated a total of 723.3 million euros in central government and municipal budget revenue, 1.6 percent less than projected, but 9.7 percent more than a year ago.
This year's central government budget projects 6.767 billion euros in annual revenue not including EU funds and 9.071 billion euros including EU funds.