6.—(1) Subject to the provisions of this section, the dismissal of an employee shall be deemed, for the purposes of this Act, to be an unfair dismissal unless, having regard to all the circumstances, there were substantial grounds justifying the dismissal.

(2) Without prejudice to the generality of subsection (1) of this section, the dismissal of an employee shall be deemed, for the purposes of this Act, to be an unfair dismissal if it results wholly or mainly from one or more of the following:

(a) the employee’s membership, or proposal that he or another person become a member, of, or his engaging in activities on behalf of, a trade union or excepted body under the Trade Union Acts, 1941 and 1971, where the times at which he engages in such activities are outside his hours of work or are times during his hours of work in which he is permitted pursuant to the contract of employment between him and his employer so to engage,

F34[(aa) without prejudice to paragraph (a), the employee—

(i) being a member of a trade union which made a request referred to in section 2(1) of the Industrial Relations (Amendment) Act 2001,

(ii) being in the employment of the employer concerned in the grade, group or category to which the trade dispute, referred to in that section, relates, and

(iii) having provided evidence or other information or assistance to any person, for the purposes of the examination of that request by the Labour Court or in respect of an investigation made by it under that Act pursuant to that request,]

(b) the religious or political opinions of the employee,

F35[(ba) the employee having made a protected disclosure,]

(c) civil proceedings whether actual, threatened or proposed against the employer to which the employee is or will be a party or in which the employee was or is likely to be a witness,

(d) criminal proceedings against the employer, whether actual, threatened or proposed, in relation to which the employee has made, proposed or threatened to make a complaint or statement to the prosecuting authority or to any other authority connected with or involved in the prosecution of the proceedings or in which the employee was or is likely to be a witness,

F36[(dd) the exercise or proposed exercise by the employee of the right to parental leave, force majeure leave F37[, leave for medical care purposes, domestic violence leave or a request for a flexible working arrangement] under and in accordance with the Parental Leave Act, 1998, or carer’s leave under and in accordance with the Carer’s Leave Act, 2001,]

F38[(e) the race, colour or sexual orientation of the employee,

(ee) the age of the employee,

(eee) the employee’s membership of the travelling community,]

F39[(f) the employee’s pregnancy, attendance at ante-natal classes, giving birth or breastfeeding or any matters connected therewith,]

F39[(g) the exercise or proposed exercise by the employee of the right under the Maternity Protection Act 1994 to any form of protective leave or natal care absence, within the meaning of Part IV of that Act, or to time off from work to attend ante-natal classes in accordance with section 15A (inserted by section 8 of the Maternity Protection (Amendment) Act 2004), or to time off from work or a reduction of working hours for breastfeeding in accordance with section 15B (inserted by section 9 of the Maternity Protection (Amendment) Act 2004), of the first-mentioned Act,]

F40[(h) the exercise or contemplated exercise by an adoptive parent of the parent’s right under the Adoptive Leave Acts 1995 and 2005 to adoptive leave or additional adoptive leave or a period of time off to attend certain pre-adoption classes or F41[meetings,]]

F42[(i) the exercise or proposed exercise by the employee of the right under the Paternity Leave and Benefit Act 2016 to paternity leave or transferred paternity leave within the meaning of that Act,]

F43[(j) the exercise or proposed exercise by the employee of the right under the Parent’s Leave and Benefit Act 2019 to parent’s leave or transferred parent’s leave within the meaning of that Act.]

F44[(2A) Sections 3 and 4 of this Act do not apply to a case falling within paragraph (f), (g) F45[(h), (i) or (j)] of subsection (2) of this section and, for the purposes of those paragraphs, "employee" and "adopting parent" include a person who would otherwise be excluded from this Act by paragraph (a), (c), (f) or (g) of section 2 (1) of this Act.]

F46[(2B) Sections 3 and 4 do not apply to a case falling within subsection (2)(dd) and, for the purpose of that paragraph, "employee" includes a person who would otherwise be excluded from this Act by paragraph (a), (c), (f) or (g) of section 2(1).]

F47[(2C) Sections 3 and 4 do not apply to a case falling within subsection (2)(dd) and, for the purpose of that paragraph, "employee" includes a person who would otherwise be excluded from this Act by paragraph (a), (b), (c), (d), (e), (f), (g), (h), (i) or (j) of section 2(1).]

F48[(2D) Sections 3 and 4 do not apply to a case falling within paragraph (ba) of subsection (2) and that paragraph applies to a person who would otherwise be excluded from this Act by any of paragraphs (a) to (c) and (e) to (k) of section 2(1).]

(3) Without prejudice to the generality of subsection (1) of this section, if an employee was dismissed due to redundancy but the circumstances constituting the redundancy applied equally to one or more other employees in similar employment with the same employer who have not been dismissed, and either—

(a) the selection of that employee for dismissal resulted wholly or mainly from one or more of the matters specified in subsection (2) of this section or another matter that would not be a ground justifying dismissal, or

(b) he was selected for dismissal in contravention of a procedure (being a procedure that has been agreed upon by or on behalf of the employer and by the employee or a trade union, or an excepted body under the Trade Union Acts, 1941 and 1971, representing him or has been established by the custom and practice of the employment concerned) relating to redundancy and there were no special reasons justifying a departure from that procedure,

then the dismissal shall be deemed, for the purposes of this Act, to be an unfair dismissal.

(4) Without prejudice to the generality of subsection (1) of this section, the dismissal of an employee shall be deemed, for the purposes of this Act, not to be an unfair dismissal, if it results wholly or mainly from one or more of the following:

(a) the capability, competence or qualifications of the employee for performing work of the kind which he was employed by the employer to do,

(b) the conduct of the employee,

(c) the redundancy of the employee, and

(d) the employee being unable to work or continue to work in the position which he held without contravention (by him or by his employer) of a duty or restriction imposed by or under any statute or instrument made under statute.

(5) (a) Without prejudice to the generality of subsection (1) of this section, the dismissal by the Minister for Defence of a civilian employed with the Defence Forces under section 30 (1) (g) of the Defence Act, 1954, shall be deemed for the purposes of this Act not to be an unfair dismissal if it is shown that the dismissal was for the purpose of safeguarding national security.

(b) A certificate purporting to be signed by the Minister for Defence and stating that a dismissal by the Minister for Defence of a civilian named in the certificate from employment with the Defence Forces under section 30 (1) (g) of the Defence Act, 1954, was for the purpose of safeguarding national security shall be evidence, for the purposes of this Act, of the facts stated in the certificate without further proof.

(6) In determining for the purposes of this Act whether the dismissal of an employee was an unfair dismissal or not, it shall be for the employer to show that the dismissal resulted wholly or mainly from one or more of the matters specified in subsection (4) of this section or that there were other substantial grounds justifying the dismissal.

F38[(7) Without prejudice to the generality of subsection (1) of this section, in determining if a dismissal is an unfair dismissal, regard may be had, if F49[the adjudication officer or the Labour Court], as the case may be, considers it appropriate to do so—

(a) to the reasonableness or otherwise of the conduct (whether by act or omission) of the employer in relation to the dismissal, and

(b) to the extent (if any) of the compliance or failure to comply by the employer, in relation to the employee, with the procedure referred to in section 14 (1) of this Act or with the provisions of any code of practice referred to in paragraph (d) (inserted by the Unfair Dismissals (Amendment) Act, 1993) of section 7 (2) of this Act.]