* Saudi labour ministry issues statement on unpaid wages

* Industry sources say several firms face this problem

* Government spending cuts hitting construction sector most

* Some firms face shortages of working capital

* Banks' bad loan provisions rising, may affect wider economy

By Tom Arnold and Andrew Torchia

DUBAI, Feb 9 (Reuters) - Some Saudi Arabian construction companies are struggling to pay their staff on time in a sign of growing pressure on the economy from low oil prices, which are causing the government to slow spending on building projects.

In an unusual move this week, the Ministry of Labour issued a public statement saying workers at a "major institution" had complained they had not been paid for months. It said it had established the complaints were true and taken remedial action.

The ministry did not name the institution or give details of its action; it did not respond to telephone calls seeking comment. But senior industry sources told Reuters that the firm was in the construction sector and that at least several other sizeable companies in the industry faced the same problem.

One executive at a large Saudi construction firm, speaking on condition of anonymity, told Reuters it had been having problems paying its employees for a few months. "It's not just us, it's several construction companies that work on government projects," he said.

As the government of the world's top oil exporter slows spending to reduce a budget deficit of around $100 billion, construction is proving to be the hardest hit sector, because firms depend heavily on government business for their cash flow.

"The pace of execution on some of the existing projects has slowed down, so a project that would take six months to complete may now see an extended execution time line," said Murad Ansari, analyst at EFG-Hermes in Saudi Arabia.

"Moreover, government payments have slowed down. As a result, contractors which normally rely on short-term funding for projects are feeling an impact on their working capital, so their ability to repay debt is not as strong as it was before."

Construction accounts for only about 7 percent of Saudi gross domestic product. But in coming months the sector's difficulties could have a wider impact as suppliers are hit and banks lending to the industry take more provisions for potential bad loans.

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Saudi spending and reserves http://reut.rs/1m6RPS1

Saudi GDP growth by sector http://link.reuters.com/tef52w

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PAYMENTS

Delayed payments to staff, sometimes due to red tape and inefficient bureaucracy rather than financial difficulties, have been a feature of the construction industry in Saudi Arabia and the Gulf for years.

But the problem has worsened greatly in the last few months because of government austerity measures, industry executives said, speaking on condition of anonymity because of commercial sensitivities.

"Many contractors are awaiting payment from the government. It's an industry-wide problem," said an executive at another construction firm operating in the kingdom.

The 2016 state budget envisages total spending of 840 billion riyals ($224 billion); if the government keeps to that figure, it would represent a 14 percent drop from last year's actual spending. Since the government has little political room to reduce spending on wages for civil servants, much or most of its cuts are believed to be in building projects.

During Saudi Arabia's last economic slowdown in 2009, also triggered by an oil price slump, the government raised advance payments to builders to support their cash flow and ensure that projects continued without interruption, Ansari said.

That is not happening now. The finance ministry has cut advance payments to firms doing state construction work to 5 percent of contract value from 20 percent, the al-Hayat newspaper reported.

"Money is not being paid at the top level," said one banker to the industry. "This has been going on since October and it is hard to know how long it will go on for."

The vast bulk of many big builders' business comes from the government.

At least several companies have begun talks to reschedule debts. Jabal Omar Development said last month it was in talks with creditors after failing to make the first repayment of 650 million riyals on a 3 billion riyal government loan.

Story continues