Chapter 13 of the Bankruptcy Code uses a statutory formula known as the “means test” to help ensure that debtors who can pay creditors do pay them. The means test instructs a debtor to determine his “disposable income” — the amount he has available to reimburse creditors — by deducting from his current monthly income “amounts reasonably necessary to be expended” for, inter alia, “maintenance or support.” 11 U. S. C. §1325(b)(2)(A)(i). For a debtor whose income is above the median for his State, the means test indentifies which expenses qualify as “amounts reasonably necessary to be expended.” As relevant here, the statute provides that “[t]he debtor’s monthly expenses shall be the debtor’s applicable monthly expense amounts specified under the National Standards and Local Standards, and the debtor’s actual monthly expenses for the categories specified as Other Necessary Expenses issued by the Internal Revenue Service [IRS] for the area in which the debtor resides.” §707(b)(2)(A)(ii).

The Standards are tables listing standardized expense amounts for basic necessities, which the IRS prepares to help calculate taxpayers’ ability to pay overdue taxes. The IRS also creates supplemental guidelines known as the “Collection Financial Standards,” which describe how to use the tables and what the amounts listed in them mean. The Local Standards include an allowance for transportation expenses, divided into vehicle “Ownership Costs” and vehicle “Operating Costs.” The Collection Financial Standards explain that “Ownership Costs” cover monthly loan or lease payments on an automobile; the expense amounts listed are based on nationwide car financing data. The Collection Financial Standards further state that a taxpayer who has no car payment may not claim an allowance for ownership costs.