If addressed early enough, austerity is not necessary. Use zero-level funding to keep the same level of nominal government spending. If accompanied by GDP growth, government spending as a percentage of GDP will decrease over time.
There is also the long-abandoned concept of spending offsets - for every $1 of new government spending, $2, $1.50, $1.25 of exisiting government spending must be eliminated.
Choking off government spending by starving it of revenue doesnt' work, especially in this low rate environment, because they borrow more money instead of reducing spending.