Revenue in the world's fourth-largest oil exporter recorded a 17 percent jump to 15.13 billion dinars at the end of December from a year ago, data on the Finance Ministry website showed.

The fiscal year in Kuwait starts in April.

The OPEC member's oil revenue accounted for 93 percent of income, while spending in the first nine months reached 8.09 billion dinars, 46 percent of the full year plan. 

The surplus reached 6.04 billion dinars in the first eight months of the same fiscal year.

The Gulf state's 2010/11 budget forecast a deficit of 6.58 billion dinars, assuming its crude would fetch $43 a barrel. 

Analysts have said Kuwait is likely to register the biggest budget surplus in the Gulf Arab region by the financial year-end as the oil price estimate on which it is based is well below current market prices. 

Benchmark US crude was trading at about $90.5 a barrel on Thursday.

Analysts polled by Reuters expected a fiscal surplus of 18.9 percent of gross domestic product for the current fiscal year.

Earlier this week, Kuwait's emir granted each Kuwaiti citizen 1000 dinars and free food rations until March 2012, as the Gulf Arab state marks 50 years of independence, and five years since Sheikh Sabah Al-Ahmad Al-Sabah became the emir.

The grant is worth about 1.36 billion dinars.

Analysts said that country's economy can easily withstand the grant, but surplus for the fiscal year could drop.

"The budget can easily withstand this amount of additional spending. We expect the 12th consecutive budget surplus this fiscal year  2010/11 at 5 billion dinars. The expected surplus would thus fall to about 3.9 billion dinars," said Elias Bikhazi, head of economic research at National Bank of Kuwait.