The change, approved by cabinet last week, brings civil service pay in line with the government's January-December fiscal year, the Arab News and Saudi Gazette reported.
The reports said the latest austerity measure took effect on October 1.
Saudi Arabia, the world's biggest oil exporter, is cutting government spending and re-orienting its economy after a collapse over the past two years of the global oil price which provided most of its revenue.
Last week, cabinet also cut by 20 per cent the salaries of ministers and froze the wages of lower-ranked civil servants.
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Almost twice as many Saudis are employed in the bloated public sector - where hours are shorter and leave longer - than in private firms.
In April, the king's son, Deputy Crown Prince Mohammed bin Salman, announced the wide-ranging Vision 2030 plan to diversify the economy.
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