To amend the Internal Revenue Code of 1986 to provide for taxpayers making donations with their returns of income tax to the Federal Government to pay down the public debt.

Donate Extra Money Against National Debt Act of 2018 or the DEMAND Act of 2018 This bill amends the Internal Revenue Code to allow taxpayers to donate an amount (not less than $1), in addition to any tax owed, which shall be deposited in the general fund of the Treasury and transferred to an account used to reduce the public debt. Each donation must be designated on a taxpayer's income tax return at the time such return is filed.