* Q1 GDP fall deeper than flash estimate
* First ever full-year contraction forecast
* Budget takes hit from slowing economy
(Adds budget implications in paragraphs 3, 13-17)
By Peter Laca
BRATISLAVA, June 3 (Reuters) - The Slovak economy shrank by 5.6 percent in the first quarter, the Statistics Office said on Wednesday, forecasting a first ever full-year contraction in 2009 as domestic demand begins to crumble.
The year-on-year fall in gross domestic product, which was worse than the flash estimate of a 5.4 percent decline, was the first contraction in nine years and compared with annual growth of 2.5 percent in the fourth quarter of 2008.
The economic downturn, which is also causing higher unemployment, has been curbing budget revenues and complicating efforts by Prime Minister Robert Fico to expand welfare programmes one year before a general election.
"The key was the fall in external demand, and this will continue," said Juraj Valachy, an analyst at Tatra Banka in Bratislava. "We've also started to see significant secondary effects on the Slovak economy, as household consumption declines, as well as investments and others."
Slovakia, a euro zone member since January, has been hit by the global economic downturn which has curbed demand for its exports, mainly cars and electronic goods, in the West.
Data released on Wednesday showed household consumption falling by 1.2 percent on the year, after a 4.7 percent rise in the fourth quarter of 2008 and compared with strong 8.4 percent growth in the first three months of last year.
Slovakia is now heading for its first full-year economic contraction ever. The Statistics Office said it forecast full-year GDP to shrink by 3.5 percent, more than the central bank's prediction of a 2.4 percent contraction.
Analysts predicted even a deeper fall.
"Despite optimism in the world, Slovak companies still report falling foreign demand, and we also see a rise in unemployment," said Eduard Hagara, an ING Bank analyst in Bratislava.
"Household consumption could show a more significant decline in the future... This year will be very bad, we see a 5.3 percent GDP fall on the year, and then 1.5 percent growth in 2010," he said.
The Slovak economy has been slowing sharply from one of the highest growth rates in the European Union in the past few years. GDP growth was a record high of 10.4 percent in 2007 and stood at 6.4 percent last year.
In addition to slowing demand, Slovakia was hurt by an interruption of gas supplies in January, which forced major industrial companies to curb or completely shut production.
BUDGET HIT
Slovakia's economy fared worse than its central European neighbours, Poland and Czech Republic, whose flash GDP estimates showed growth of 0.8 percent and a drop of 3.4 percent in the first quarter, respectively. The Slovak GDP fall was smaller than Hungary's flash estimate of a negative 6.4 percent.
The government originally expected Slovakia to be one of the best performing economies in the EU this year, and its latest forecast from February saw real GDP growth of 2.4 percent.
Cabinet officials have said the projections will be revised downwards, and Fico said a contraction was possible this year.
The government aims to keep the public finance deficit at no more than 3 percent of GDP to comply with the EU rules, but the economic downturn may cause a bigger fiscal gap.
"We expect that a fall in tax revenues as well as higher expenditures related to rising unemployment and anti-crisis measures will lead to widening of the fiscal deficit to around 5.5 percent of GDP," said Maria Valachyova, the senior analyst at Slovenska Sporitelna, the Slovak unit of Erste Bank. (Additional reporting by Martin Santa, editing by Mike Peacock/Toby Chopra)