Every person elected or appointed to any municipal office, before the person enters upon the discharge of the duties thereof, shall take and subscribe the oath of office prescribed for civil officers, and, except in the case of the auditor, shall file the same with the city auditor within ten days after notice of the election or appointment has been given. The oath of the city auditor shall be filed in the office of the auditor of the county in which the municipality is located. Refusal to take the oath of office, as required by this section, shall also be deemed a refusal to serve and, therefore, a failure to qualify for the office pursuant to section 44-02-01.
40-13-04. Salaries of officers and employees fixed by ordinance - Diminution of officers' salaries during term prohibited. Except when otherwise provided by law, any officer or employee of a city is entitled to receive the salary, fees, or other compensation fixed by ordinance or resolution. After having been once fixed, the salary of an officer may not be diminished to take effect during the term for which the officer was elected or appointed.
40-13-05. Officers not to be interested in contracts or work of municipality - Exception. Except as otherwise provided by law, no municipal officer, in a municipality having a population of ten thousand or more according to the last federal decennial census, shall be directly or indirectly interested in: 1. Any contract, work, or business of the municipality; 2. The sale of any article the expense, price, or consideration of which is paid from the municipal treasury or by any assessment levied by any act or ordinance; or 3. The purchase of any real estate or other property belonging to the municipality or which shall be sold for taxes or assessments or by virtue of any process issued in any suit brought by the municipality.
Provided, however, that the foregoing shall not be applicable if unanimously approved by the other members of the governing body of the political subdivision by a finding unanimously adopted by such other members and entered in the official minutes of the governing body, to be necessary for the reason that the services or property obtained are not otherwise available at equal cost.