NEW DELHI — When voters swept Prime Minister Narendra Modi into power five years ago, it was in no small part because of his vows to create millions of jobs and vault India into an era of prosperity.
But now, just months before the next general election, Mr. Modi is facing a potentially troublesome challenge on the jobs promises that may be partly of his own making.
His government was accused on Thursday of suppressing an official report on the national unemployment rate that apparently showed it had reached a 45-year high in 2017.
The Business Standard, a respected Indian financial newspaper, published leaked findings from the unemployment report, which is based on a survey and produced by the National Sample Survey Office, a government agency.
There had been expectations that the report would be released in December. Two commissioners responsible for reviewing data in the report, who had advocated releasing it, resigned in protest this week.
Officials in Mr. Modi’s government scrambled on Thursday to blunt the impact of what amounted to withholding information that discredits the core of his economic record. The chairman of NITI Aayog, a government research organization, said the unemployment report was still in draft form, was not ready for dissemination and would be released in March. The response raised the possibility that the data could be revised.
But economists said the findings, if verified, were problematic for Mr. Modi, the dynamic prime minister whose popularity has always rested on his Hindu nationalism and promises to make India an economic powerhouse rivaling China.
While the leaked 2017 unemployment rate, 6.1 percent, may not sound so gloomy, it is roughly triple the rate of five years earlier, the last time a comparable national survey was conducted. And with India’s work force population of roughly 500 million, that translates into 30 million people who cannot find a job — including many of the 10 million to 12 million young people flooding into the labor market each year.
Moreover, the report represents the first comprehensive look at the job consequences of two disruptive economic changes Mr. Modi imposed in the past few years.
First was his abrupt decision in November 2016 to eliminate most of the country’s cash currency in circulation. That decision, known as demonetization, was meant to crack down on illicit cash transactions, but the change was so hasty and hectic that it created acute shortages and inflicted enormous damage on large swathes of India’s economy.
Then in July 2017, Mr. Modi implemented a sweeping new single tax code, the Goods and Services Tax, known as the G.S.T., but enforcement of the change was so disorganized that economists say it crippled many small businesses.
The leaked unemployment report, if confirmed, undercuts a basic premise of Mr. Modi’s 2014 campaign: creating jobs for the country’s enormous and young work force. People under age 35 represent roughly two-thirds of the population of 1.35 billion, and, the thinking went, they would earn and spend, accelerating economic growth that would pull millions more out of poverty.
Opposition politicians seized on the leaked report as evidence that Mr. Modi and his ruling Bharatiya Janata Party were responsible for the worst unemployment rate since 1972-73, when the country was roiled by war with Pakistan and by the effects of global oil market shocks.
“NoMo Jobs!” Rahul Gandhi, the leader of the Indian National Congress, an opposition party, wrote on Twitter, adding that the “leaked job creation report card reveals a National Disaster.”
The leaked report compounded other recent signs of employment distress in India, including data from the All India Manufacturers’ Organization in December that said 3.5 million jobs had been lost since 2016.
A far more dire study, released Jan. 9 by the Center for Monitoring Indian Economy, a business information company in Mumbai, said 11 million jobs were lost in 2018 alone.
Mahesh Vyas, the company’s managing director, attributed the plunge largely to the “combined effects of demonetization and G.S.T.”
The leaked report came against the backdrop of preparations for national elections likely to be held by early May.
While Mr. Modi once looked unbeatable, recent polls have suggested he is heading into a more competitive race. Any bad news on employment figures could damage his prospects.
Employment is expected to be the single most important issue for voters this year, a new Times Now-VMR opinion poll has found.
Economists say it would be unfair to blame Mr. Modi’s government entirely for India’s unemployment trend, which predated his ascent to power. Less investment in the rural economy, disastrous droughts and struggles in Indian manufacturing also have contributed.
“This buildup has been going on for many years,’’ said Himanshu, an associate professor of economics at Jawaharlal Nehru University in New Delhi who goes by only one name. “In fact, Modi came on the promise of providing jobs. But the situation has become worse in his period.”
While Mr. Gandhi, the scion of a long political dynasty, has been hammering the Indian government over its record on employment, Mr. Modi’s ministers were quick to defend the prime minister after the jobs report was leaked.
“This survey focuses mostly, I think, on the organized sector,” Raj Kumar Singh, the energy minister, told the independent broadcaster NDTV. “Our economy is growing at an unprecedented rate. That economy can’t grow without economic activity actually happening.’’
India’s economy has been growing at an annual rate of around 7 percent for several years, among the fastest of any major economy.
According to the Times Now-VMR poll, Mr. Modi remains the most trusted leader in the country. When asked who had the better plans for India, 44.4 percent of respondents chose Mr. Modi, compared with 29.9 percent for Mr. Gandhi.
The previous government, led by Mr. Gandhi’s party, was also uncomfortable releasing unemployment figures, which have always been a politically delicate issue. Still, said Himanshu, the economist, Mr. Modi and his aides seemed even more sensitive about them.
“They are trying to control the statistical system, and the government is obviously apprehensive of the data,” he said.