TITLE 5 - US CODE - SUBCHAPTER I - GENERAL PROVISIONS

5 USC 5501 - Disposition of money accruing from lapsed salaries or unused appropriations for salaries

Money accruing from lapsed salaries or from unused appropriations for salaries shall be covered into the Treasury of the United States. An individual who violates this section shall be removed from the service.

5 USC 5502 - Unauthorized office; prohibition on use of funds

(a) Payment for services may not be made from the Treasury of the United States to an individual acting or assuming to act as an officer in the civil service or uniformed services in an office which is not authorized by existing law, unless the office is later sanctioned by law.
(b) Except as otherwise provided by statute, public money and appropriations may not be used for pay or allowance for an individual employed by an official of the United States retired from active service.

5 USC 5503 - Recess appointments

(a) Payment for services may not be made from the Treasury of the United States to an individual appointed during a recess of the Senate to fill a vacancy in an existing office, if the vacancy existed while the Senate was in session and was by law required to be filled by and with the advice and consent of the Senate, until the appointee has been confirmed by the Senate. This subsection does not apply
(1) if the vacancy arose within 30 days before the end of the session of the Senate;
(2) if, at the end of the session, a nomination for the office, other than the nomination of an individual appointed during the preceding recess of the Senate, was pending before the Senate for its advice and consent; or
(3) if a nomination for the office was rejected by the Senate within 30 days before the end of the session and an individual other than the one whose nomination was rejected thereafter receives a recess appointment.
(b) A nomination to fill a vacancy referred to by paragraph (1), (2), or (3) of subsection (a) of this section shall be submitted to the Senate not later than 40 days after the beginning of the next session of the Senate.

5 USC 5504 - Biweekly pay periods; computation of pay

(a) The pay period for an employee covers two administrative workweeks.
(b) When, in the case of an employee, it is necessary for computation of pay under this subsection to convert an annual rate of basic pay to a basic hourly, daily, weekly, or biweekly rate, the following rules govern:
(1) To derive an hourly rate, divide the annual rate by 2,087.
(2) To derive a daily rate, multiply the hourly rate by the number of daily hours of service required.
(3) To derive a weekly or biweekly rate, multiply the hourly rate by 40 or 80, as the case may be.

Rates are computed to the nearest cent, counting one-half and over as a whole cent.

(c) For the purposes of this section:
(1) The term employee means
(A) an employee in or under an Executive agency;
(B) an employee in or under the Office of the Architect of the Capitol, the Botanic Garden, and the Library of Congress, for whom a basic administrative workweek is established under section 6101 (a)(5) of this title; and
(C) an individual employed by the government of the District of Columbia.
(2) The term employee does not include
(A) an employee on the Isthmus of Panama in the service of the Panama Canal Commission; or
(B) an employee or individual excluded from the definition of employee in section 5541 (2) of this title other than an employee or individual excluded by clauses (ii), (iii), and (xiv) through (xvii) of such section.
(3) Notwithstanding paragraph (2), an individual who otherwise would be excluded from the definition of employee shall be deemed to be an employee for purposes of this section if the individuals employing agency so elects, under guidelines in regulations promulgated by the Office of Personnel Management under subsection (d)(2).
(d) 
(1) The Office of Personnel Management may prescribe regulations, subject to the approval of the President, necessary for the administration of this section insofar as this section affects employees in or under an Executive agency.
(2) The Office of Personnel Management shall provide guidelines by regulation for exemptions to be made by the heads of agencies under subsection (c)(3). Such guidelines shall provide for such exemptions only under exceptional circumstances.

5 USC 5505 - Monthly pay periods; computation of pay

The pay period for an individual in the service of the United States whose pay is monthly or annual covers one calendar month, and the following rules for division of time and computation of pay for services performed govern:
(1) A months pay is one-twelfth of a years pay.
(2) A days pay is one-thirtieth of a months pay.
(3) The 31st day of a calendar month is ignored in computing pay, except that one days pay is forfeited for one days unauthorized absence on the 31st day of a calendar month.
(4) For each day of the month elapsing before entering the service, one days pay is deducted from the first months pay of the individual.

This section does not apply to an employee whose pay is computed under section 5504 (b) of this title.

5 USC 5506 - Computation of extra pay based on standard or daylight saving time

When an employee as defined by section 2105 of this title or an individual employed by the government of the District of Columbia is entitled to extra pay for services performed between or after certain named hours of the day or night, the extra pay is computed on the basis of either standard or daylight saving time, depending on the time observed by law, custom, or practice where the services are performed.

5 USC 5507 - Officer affidavit; condition to pay

An officer required by section 3332 of this title to file an affidavit may not be paid until the affidavit has been filed.

5 USC 5508 - Officer entitled to leave; effect on pay status

An officer in the executive branch and an officer of the government of the District of Columbia to whom subchapter I of chapter 63 of this title applies are not entitled to the pay of their offices solely because of their status as officers.

5 USC 5509 - Appropriations

There are authorized to be appropriated sums necessary to carry out the provisions of this title.