A budget by definition includes both income and expenses. The two halves of a budget are interdependent, so that if expenses go up, income must also rise. Otherwise, the budget won’t balance. Someone ready to retire at 62 with $1.6 million in an IRA and $2,800 in monthly Social Security benefits could start with an income estimate of approximately $97,600, based on a popular retirement fund withdrawal rate. This would be enough to fund a comfortable retirement in many cases, based on surveys of retiree spe ...