(Adds analyst comment, regional view)
By Peter Laca
BRATISLAVA, May 27 (Reuters) - The Slovak central bank kept its key interest rates on hold on Tuesday, as expected, to keep borrowing costs stable for the 13th consecutive month as the country moves closer towards euro adoption next year.
The decision, made at the first policy meeting since the European Commission judged Slovakia fit to adopt the euro in 2009, kept the main two-week repo rate at 4.25 percent, a 25 basis point premium over the euro zone benchmark.
Of the biggest countries to join the European Union this decade, only the Czech Republic has looser monetary policy, with its key rate at 3.75 percent.
Hungary raised its benchmark by 25 basis points to 8.5 percent on Monday, while some policy makers in and Warsaw and Prague are contemplating higher borrowing costs to stave off a surge in inflation.
The National Bank of Slovakia (NBS) said board members would comment on the rate decision at a news conference scheduled for 1 p.m. (1100 GMT).
The Slovak central bank has held rates steady for just over a year despite accelerating price growth, saying inflation has been fuelled by factors outside its influence -- mainly the global increase in the costs of food and energy.
Providing the European Central Bank (ECB) does not hike rates, the NBS will have to ease its monetary policy to fall in step with the single currency area as part of euro adoption.
But analysts said signs of demand-led pressures in Slovakia's fast growing economy would probably prevent early easing.
UniCredit Bank analysts in Bratislava said slightly higher-than-expected GDP growth in the first quarter and a strong annual rise in retails sales meant the NBS might want to keep monetary conditions more restrictive.
"Even despite monetary conditions tightening through the exchange rate channel (crown strengthening), it is possible that the NBS will proceed with harmonisation of key interest rates as late as at the end of the year," UniCredit Bank said in a note.
Slovak inflation, measured by EU methodology, reached a 16-month high of 3.7 percent in April. Market watchers see a further acceleration to around 4 percent in the summer, compared with the NBS's forecast of 2.8 percent for the end of this year.
STRONG CROWN
Slovakia's effort to tame inflation has been helped by its firming currency, which has reached repeated record highs in recent weeks as investors bet on the country seeking a strong switchover rate for swapping crowns for euros.
The Slovak unit was little changed after the interest rate decision, trading at 31.090 per euro on Tuesday.
The Slovak government will negotiate with EU authorities over the conversion rate for euro zone entry in the coming weeks, and Prime Minister Robert Fico has said a strong exchange rate was needed to counter inflation risks.
The market widely believes Slovakia will revalue the crown's peg to the single currency within the Exchange Rate Mechanism ERM-2. The unit now trades 12.3 percent above the central parity rate of 35.4424 crowns per euro. (Reporting by Peter Laca; Editing by Michael Winfrey)