* Plans no tax hikes after election
* Pledges to cut deficit to 3 pct/GDP by 2012 by cuts
* Borrowing costs seen falling
By Robert Mueller and Jana Mlcochova
PRAGUE, April 13 (Reuters) - The main Czech rightist party, if elected to form a coalition, would bring the public deficit down to the EU's 3 percent of GDP limit by 2012, from almost double that last year, without raising any taxes, its main economic adviser said on Tuesday.
The Czechs will hold a general election at the end of May to usher in a cabinet with a full political mandate, after a year-long tenure of a caretaker government, which kept the budget gap under control during the economic downturn but lacked power to push through any fiscal reforms.
The right-wing Civic Democrats (ODS) trail the leftist Social Democrats, but the Social Democrats are almost sure to fall short of a majority, polls indicate. Some surveys suggest the right-wing and centrist parties stand a chance of forming a majority coalition.
"Based on our plans (on) how to deal with public finances from now on ... including milestones in 2012 when we should reach a 3 percent deficit and in 2017 (when we target) a balanced budget, we can do without a rise in taxes," Martin Kocourek, who heads the supervisory board at state power utility CEZ <CEZPsp.RP> and is the Civic Democrats' main economic adviser, told Reuters.
The interim government pushed through a hike in value-added tax rates and excise taxes, and raised the limit for social and health insurance taxes, to bring the public sector deficit to 5.3 percent this year from 5.9 percent in 2009.
Kocourek said that would be enough tax hikes for the next four years.
"By pledging not to raise the tax burden, we will build pressure to do something on the expenditure side," he said.
AGEING POPULATION
The Organisation for Economic Cooperation and Development said last week the Czechs should bring the structural, growth-adjusted deficit close to zero in the medium term, targeting cutting expenditure. [
]Kocourek said his party's programme was in line with the developed countries club's recommendations.
Rating agencies -- the Czechs are rated 'A' by Standard and Poor's' -- and investors are waiting to see how the new administration tackles the budget, which was in deficit even during years of record economic growth prior to the global financial crisis.
The country's ageing population is straining the pension and health systems and a generous welfare policy has led to abuse.
The Social Democrats staunchly oppose cutting benefits and pension reforms. They propose raising taxes instead to cut the deficit to 3 percent of GDP in 2013.
Analysts have doubted both parties' ability to cut the deficit as fast as they promise.
Kocourek said the ODS aimed to freeze social payments at current levels and tighten the rules for qualifying for them. This would lead to savings of 15.9 billion crowns ($861.8 million) in 2011, he said.
He also predicted a dip in debt servicing costs.
Investors consider the central European nation's treasury paper a safer bet than those of euro zone peripheral countries because the Czech Republic has a relatively low debt level, which is forecast to be around 40 percent of GDP this year.
Five-year credit default swaps <CZGV5YUSAC=R>, measuring the market's perception of how risky the country is, were at 65.8 points on Tuesday, versus an all-time high of 350 in February 2009. The yield on the five-year state bond <CZ5YT=RP> traded at 2.756 percent on Tuesday, 57 basis points over the German Bund. (Editing by Susan Fenton)