SPRINGFIELD - With time running out on the state's fiscal year, Illinois Gov. Pat Quinn threatened Tuesday to veto any budget sent to him by lawmakers that is unbalanced.

It was the latest and most heated message from the Democratic governor, who has spent the past four months threatening to cut programs if lawmakers don't approve an income tax increase, which he wants to help close a deficit estimated as high as $11.6 billion.

"I'm prepared to stay here all summer to get the job done. Whatever it takes," Quinn said to a joint session of the House and Senate Tuesday.

The governor's ultimatum surprised some lawmakers, who said Quinn painted himself into a corner in his bid to leverage an 11th-hour budget agreement on the final day of the state's fiscal year.

"The Democrats are not going to give him, for political reasons, a tax increase," said state Sen. Bill Brady, R-Bloomington, who is a candidate for governor.

State Sen. Mike Jacobs, D-East Moline, said he didn't see a tax increase coming in the near future and criticized Quinn for not compromising more.

"You can't be in a position of leadership and not try to meet people half way," Jacobs said.

The standoff means Illinois is poised to enter the new fiscal year today without a spending plan on the books. That doesn't mean state operations will immediately cease, but it does set up a scenario in which paychecks could be missed within the next two weeks if a solution isn't found. Because state funding is in limbo, some local social service providers have already implemented layoffs.