Poland's 2013 budget draft adopted by the government on Tuesday is "difficult" but "optimal" for the period of economic slowdown, deputy PM and Economy Minister Waldemar Pawlak told reporters.

"There was a tough discussion at yesterday's government sitting. [Finance] Minister [Jacek] Rostowski hasn't left us too much of maneuvering space," Pawlak said, adding that external situation will force the government to act if need be both this and next year.

The budget will now be sent to social consultations, Pawlak also said.

The Polish government has preliminarily adopted 2013 budget draft, which is build on 2.2% GDP growth with deficit capped at PLN 35.6 billion, government press office said in a statement Tuesday night.

Poland plans to raise PLN 299.18 billion revenues, while spending is expected to hit PLN 334.79 billion, the statement reads.

Poland's 2013 budget draft should be based on more conservative assumptions of 1.5% GDP growth, former Monetary Policy Council member and member of PM's economic council Dariusz Filar told the daily Gazeta Wyborcza.

Poland may struggle to reach the PLN 299.19 billion in revenues in 2013, due to lower PIT and VAT revenues, economists told daily Dziennik Gazeta Prawna.