A flexible budget is a budget that adjusts to the activity or volume levels of a company. Unlike a static budget, which does not change from the amounts established when the budget was created, a flexible budget continuously "flexes" with a business's variations in costs.What is flexible budget example? Example of a Flexible Budget ABC Company has a budget of $10 million in revenues and a $4 million cost of goods sold. Of the $4 million in budgeted cost of goods sold, $1 million is fixed, and $3 million varies directly with revenue. Thus, the variable portion of the cost of goods sold is 30% of revenues.