* Tight result expected later on Saturday
* Both right and left-wing governments possible
* Exit polls due at 1200 GMT
(Writes through with polls open, quotes)
By Michael Winfrey and Robert Mueller
PRAGUE, May 29 (Reuters) - Czechs voted on Saturday in an election likely to produce no clear winner, with the country split over leftist promises to ward off economic crisis and right-wing warnings such policies would lead to bankruptcy.
Political analysts say an inconclusive result could lead to yet another weak government, extending a decade-long logjam in structural reforms that has caused the Czech Republic to lag behind other European Union newcomers.
Social Democrats backed by mostly older and less well off Czechs are expected to win the most votes in the two-day poll but fall short of a majority, with the country of 10.5 million divided over whether to cut spending or raise welfare benefits.
Drawn-out coalition talks could rattle investors who want a decisive government to shepherd a nascent recovery in the NATO member state after its economy fell 4.1 percent last year.
A main concern is whether officials can rein in a budget deficit that hit 5.9 percent of annual output last year and enact changes to pension, healthcare and welfare systems that have changed little in the 21 years since the fall of communism.
"The country may either face the rule of a leftist government or a grand coalition of parties which have little in common or a multi-party project deemed to be unstable," said Gyula Toth, an economist at bank Unicredit.
"This outcome could obviously have negative implications on potential budget deficit reduction hopes."
Exit polls will be released when polling stations close at 1200 GMT to wrap up the two days of voting. Results will come in during the afternoon and evening. Media reported high turnout and said final turnout could top 70 percent.
DEEP DIVISION
As many as eight parties could win seats, which could produce potential coalitions of many parties including a tie-up of the two main groupings, the latter of which analysts say could weaken reforms and potentially increase corruption.
But the main election issue is the budget, with the Civic Democrats invoking the Greek crisis to warn that Social Democrat leader Jiri Paroubek would bring about economic meltdown if allowed to take power.
"I believe in a success that will allow for the creation of a government of fiscal responsibility, based on a centre-right coalition," Civic Democrat leader Petr Necas said after voting on Friday.
Pavla Nechutova, a 33-year-old newly on maternity leave, said pledges by leftist parties to raise social spending would create too much debt that will have to be paid back later.
"I don't want anything orange or red to govern," she said after voting, referring to the colours of the Social Democrats and Communists. "That means nonsensical laws, and more debt. I don't want to work all my life just paying that back."
Analysts say fear of bankruptcy may be overblown, as public debt of 35 percent of gross domestic product is half of the EU average. But they add that an ageing population -- retirees are expected to outnumber workers by 2050 -- will create large deficits in the pay-as-you-go pension system.
The Civic Democrats have proposed private pension accounts, while the Social Democrats say no change is needed for now.
Interim Prime Minister Jan Fischer, who took power a year ago after a Civic Democrat government collapsed a year ago, has promised to hand over budget options to whichever type of government emerges from the election and subsequent talks.
It would ensure either side can cut the deficit to the EU-prescribed level of 3 percent of GDP by the Civic Democrats target of 2012 or a year later for the Social Democrats, with market watchers preferring the rightist party's scenario.
Many Czechs say the worst result would be a Social Democrat minority government backed by the hard-left Communists, heirs to the totalitarian regime that ruled until the 1989 Velvet Revolution and a party considered anathema in Czech politics.
"I was at the demonstrations 20 years ago. I lived through Communism and I don't want my children to live through the same thing," said 42-year-old accountant Helena Bambasova.