A flood of tax revenue from the property boom and employment growth has delivered a budget windfall to the Andrews government.

A final tally of the state's finances reveals the budget was in surplus by $2.7 billion last financial year.

Commercial lending for residential construction has grown sharply. Credit:Jessica Shapiro

That was $776 million more than predicted, and a massive $1.45 billion increase on the result for the previous year.

The result confirms the Andrews government – and to some extent the state opposition – will be able to plunder a large war chest for road, rail, health, education and law and order announcements ahead of the 2018 state election.