McManus is a mechanical engineer and his wife Mairee is a surgical physician's assistant, as well as the primary earner. He breaks out his budget by week. In 2014, they brought home an average after-tax household income of $14,735 a month. In the chart below, check out their average monthly spending for 2013, 2014, and predicted for 2015. Note that these are averages, so a single month isn't depicted.