The economy shrank last year and although the government estimates it grew 2.3 percent in 2018, that is much slower than the boom years early this decade - and not enough to put much of a dent in a record jobless rate of 12.9 percent among Saudis.
"The budget focuses on boosting activity after years of fiscal consolidation and weak growth," said Monica Malik, chief economist at Abu Dhabi Commercial Bank.
Because of the ramp-up in spending, the 2019 budget also appears to mark a slowing of Saudi Arabia's drive to cut a big state budget deficit caused by the oil price slump.
The deficit, which the government has pledged to eliminate by 2023, came in at 136 billion riyals this year, well below the 195 billion riyal gap originally projected for 2018.
That was partly because of higher oil export revenues; Brent oil has averaged about $73 a barrel so far this year, up from $54 in 2017. But Riyadh also boosted non-oil revenues with tough austerity steps such as the imposition of a 5 percent value-added-tax at the start of 2018.
Next year, the government projects only a minimal shrinking of the deficit to 131 billion riyals. Malik said her assumptions for Saudi gross domestic product and oil revenue suggested the deficit might actually widen back in 2019, to over seven percent of GDP from near four percent.
Saudi Arabia does not disclose the oil price assumptions on which its planning is based, but Malik and some other private economists estimated the 2019 budget implied Brent at $70-71 per barrel with oil production at 10.2 million barrels per day.
Jean-Paul Pigat, head of research at Lighthouse Research in Dubai, said the budget's increase in spending was lower than he had expected.
"Government spending is what ultimately drives growth in Saudi, and the wider region, and without stronger stimulus, it is difficult to see where the spark for stronger demand will come from," he said.
The government's own projections see growth in the non-oil part of the economy, which is key to creating jobs, edging up to only 2.5 percent next year from 2.3 percent this year.
The Saudi private sector has been lobbying for relief from austerity steps such as fees for hiring expatriate workers, but in briefings on Tuesday, officials gave no sign that next year's planned increases in the fees might be delayed.
The budget predicted oil revenues would jump 9 percent to 662 billion riyals in 2019, a forecast that some economists called unrealistic. Many think oil prices are unlikely to rise much if at all next year.
However, the revenue projection could be justified by further cuts to domestic fuel price subsidies -- another step which might hurt the private sector. Authorities have said further cuts will happen eventually, but did not reveal on Tuesday whether they were imminent.
Pigat said additional stimulus for the economy might come in the form of off-budget spending by the Public Investment Fund, the kingdom's main sovereign wealth fund, which is embarking on multi-billion-dollar projects to develop Saudi Arabia's tourism, entertainment and real estate industries.
Government coffers in 2018 were boosted by an unusual source: over 50 billion riyals in settlements reached with detainees in a crackdown on corruption launched at the end of last year, Finance Minister Mohammed al-Jadaan said.
Scores of top officials and businessmen were detained in Riyadh's Ritz-Carlton Hotel in a purge that began in November 2017. Investigators said earlier this year that they aimed ultimately to seize some $100 billion.
(Additional reporting by Tuqa Khalid and Saeed Azhar in Dubai; Writing by Andrew Torchia; Editing by Mark Heinrich, William Maclean) ((mailto:email@example.com; +9715 6681 7277; Reuters Messaging: rm://firstname.lastname@example.org))