Two hundred million pounds will be invested into Jaguar's Castle Bromwich factory in Birmingham if union members agree to new working practices.
Tata, who own Jaguar Land Rover say two new models will be built in Birmingham and a thousand jobs will be created.
The ballot results are expected today.
Jaguar Landrover says it is taking on 1,100 people in a massive expansion of its factory at Castle Bromwich in Birmingham.
An announcement is due shortly from Jaguar Landrover about plans to build new cars at the company's plant in Castle Bromwich in Birmingham.