Publisher: O. M. Atoyebi, SAN FCIArb.(U.K) August 4, 2026

Accidental Slips, Amendment of Judgments, Appellate Review, Clerical Errors, Correction of Judgments, Finality of Litigation, Inherent Jurisdiction, Slip Rule

Contributor: Favour Somto Nwachukwu

Introduction

The finality of judicial decisions is a fundamental principle in the administration of justice.[1] Once a court of competent jurisdiction has delivered its judgment and conclusively determined the dispute, the parties and the public are entitled to expect that the decision will remain binding, subject only to the recognised appellate process.[2] However, the principle of finality does not absolutely preclude every form of post-judgment intervention by the court that delivered the decision. Nigerian law recognises limited circumstances in which a court may revisit, correct or amend its judgment without undermining its finality or exceeding the lawful limits of judicial power.

This article examines the principles governing the amendment, correction and variation of judgments after their delivery by Nigerian courts. It distinguishes permissible corrections of clerical mistakes, accidental slips, omissions and computational errors from impermissible alterations that affect the substance of a judgment. It also considers the scope of the slip rule, the doctrine of functus officio and the inherent power of courts to correct errors necessary to give effect to their true intention.

The Doctrine of Functus Officio and Its Application to Judgments

Functus officio is a Latin expression meaning ‘having performed one’s function’. It describes a person or body that has exercised its authority and completed its task in a particular matter. Once a court delivers its final decision, it becomes functus officio in respect of that matter. The court cannot reopen the case or sit on appeal over its own decision because it has no jurisdiction to review the merits of that decision, except in narrowly defined circumstances.[3]

The doctrine of functus officio therefore provides the starting point for determining whether a court may amend its own judgment. It reinforces the principle of finality in litigation, which promotes certainty, ensures the orderly administration of justice and sustains public confidence in the judicial process.

In Onyemobi v. President O.C.C,[4] the Court held that, for the doctrine of functus officio to apply in a civil matter, the party relying on it must establish circumstances capable of sustaining a plea of res judicata. Accordingly, the party must show that the parties and subject matter in the previous proceedings are the same as those in the subsequent proceedings and that the earlier decision or order was final.[5]

Notwithstanding the general rule, Nigerian law recognises limited exceptions to the doctrine of functus officio. In Ibrahim v. Gwandu,[6] the Court identified the recognised exceptions as applications relating to default judgments, stays of execution, stays of proceedings, stays of injunctions, payment by instalments and the correction of clerical errors.[7]

Similarly, in Iteogu v. L.P.D.C.,[8] the Supreme Court held that once a court delivers its judgment, it becomes functus officio and cannot reopen the matter under any guise, except where the slip rule applies or where it is necessary to correct a clerical mistake. The court cannot subsequently vary the substance of the judgment merely to reflect what it intended to decide.

The Court further distinguished a clerical error arising from an accidental slip or omission from an intellectual or judicial error, such as wrongly assuming jurisdiction over a matter. A clerical error may be corrected under the slip rule because the correction does not alter the substance of the judgment. By contrast, an intellectual or judicial error requires a review through the appropriate appellate process and cannot be corrected by the court under the guise of amending its judgment.[9]

The Slip Rule: Scope and Application

The slip rule permits a judge to correct an error or ambiguity in a judgment where the defect may obscure or misrepresent the court’s true intention. Once a court has determined an issue, it generally lacks jurisdiction to revisit that determination unless a statutory provision or a recognised exception authorises it to do so.[10]

In Intra Motors (Nig.) Plc. v. Akinloye,[11] the Court reaffirmed that the slip rule applies to accidental slips or clerical mistakes in a judgment or court order. The error must arise from the expression of the court’s manifest intention rather than from the substance of its judicial reasoning.[12]

Similarly, in Macron Serv. Ltd. v. Afro Cont. Ltd,[13] the Court held that the slip rule empowers a court to amend or correct its record. Although discretionary and broad, the power must be exercised only where the interests of justice require it. Whether an error falls within the slip rule depends on the facts of each case, assessed objectively.[14]

Under the rule, a court may amend its judgment to correct an error and ensure that the judgment accurately reflects its intended meaning. However, the court cannot use the rule to vary a judgment or order that correctly represents its decision. Its power is limited to correcting clerical mistakes or errors arising from accidental slips or omissions. The error must concern the expression of the court’s manifest intention rather than the substance of its decision. Accordingly, a court may vary its order only to give effect to its original intention and make that intention clear.[15]

The Supreme Court carefully delineated the scope of the slip rule in Berliet (Nig.) Ltd. v. Kachalla.[16] The Court held that once a judge delivers a final judgment in a suit, the judge becomes functus officio in respect of that matter. Except for ancillary orders authorised by statute, such as orders staying the execution of the judgment or permitting the payment of a judgment debt by instalments, the judge ceases to be seised of the matter and cannot reopen it on an application by either party.[17] Accordingly, once the court enters judgment, it cannot alter the substance of its decision. It may correct only minor errors, such as spelling or typographical mistakes and mathematical errors requiring the insertion of the correct figures.[18] An appropriate motion should seek such corrections and does not require an appeal or rehearing.[19]

Distinguishing Clerical and Substantive Errors

The most significant practical and doctrinal challenge in the Nigerian law on the amendment of judgments is distinguishing clerical, accidental or computational errors from errors that affect the substance of the court’s decision. This distinction is not always readily apparent, and the courts have developed considerable case law indicating where the line should be drawn in specific circumstances. A clerical or accidental error generally arises while recording, transcribing or expressing a decision that the court has already reached in substance.

Examples recognised by the courts include misspelt names, incorrect case numbers or citations, arithmetical errors in calculating sums awarded, the inadvertent omission of a word or phrase necessary to give effect to the court’s evident intention, and similar defects of form rather than substance.

In Holborn (Nig.) Ltd. O.C.C. Ent. Ltd,[20] the Court held that the slip rule permits the correction of clerical mistakes and errors arising from accidental slips or omissions. Although a court may correct a misnomer or misdescription under the rule, it cannot, whether in the exercise of its inherent jurisdiction or the powers conferred by the applicable rules of court, vary a judgment or order that accurately reflects its decision. Neither may it alter the operative or substantive part of the judgment to substitute a different decision or form of relief.

The slip rule may be invoked only through an application seeking the correction of an accidental error. It does not permit a party to seek a review of findings of fact or conclusions of law contained in an earlier judgment. To allow such an application would effectively convert it into an appeal. In that case, however, neither party had applied for the invocation of the slip rule.

By contrast, a substantive error arises from the court’s reasoning, evaluation of evidence or legal conclusion, even where that reasoning, evaluation or conclusion is later shown to be erroneous. The appropriate remedy is an appeal to a higher court, not an application inviting the court that delivered the judgment to correct or amend it.

In Ugwa v. Lekwauwa,[21] the Court of Appeal held that an error qualifies as a clerical mistake or accidental slip only where it affects the judgment as a written document. It ceases to be clerical where it affects the decision-making process or any of its constituent elements. Accordingly, under Order 18 rule 4 of the Court of Appeal Rules, the court could not vary the judgment because it accurately reflected its decision, including its operative and substantive provisions.[22]

Similarly, in University Press Ltd. v. I.K. Martins (Nig.) Ltd,[23] the Supreme Court held that it was immaterial whether the trial judge remained committed to the substantive decision previously reached. Allowing the judge to revisit the substantive issue at a later stage of the proceedings would effectively amount to sitting on appeal over the earlier decision and would offend the appearance of impartial justice. In such circumstances, an intermediate appellate court may have no option but to order a retrial before another judge of coordinate jurisdiction. In that case, however, the error of reconsidering the substantive issue was committed by an intermediate appellate court.

The Inherent Powers of the Court to Correct Judgments

The power of Nigerian courts to correct their judgments derives not only from express procedural rules but also from the inherent jurisdiction vested in every court of record by virtue of its constitutional status. Section 6(6)(a) of the Constitution of the Federal Republic of Nigeria 1999 vests in courts established under the Constitution all the inherent powers and sanctions of a court of law.[24] This inherent jurisdiction includes the power to correct accidental errors in judgments, independently of and in addition to any express provision in the applicable rules of court. In Ugwu v. State,[25] the Supreme Court held that courts possess the inherent power to correct errors arising from accidental slips or omissions in their orders or judgments, provided that the correction does not occasion a miscarriage of justice.[26]

Courts must, however, exercise this power cautiously, having regard to the competing need to preserve the finality of judgments. In Alli v N.U.C,[27] the Supreme Court held that it may correct or modify its own order where the order or judgment does not reflect what the Court intended to record. Accordingly, the Court may correct clerical errors to clarify an otherwise obscure sentence or order. Beyond such limited corrections, however, the Supreme Court cannot ordinarily review its own judgments.

Similarly, in Raji-Ashade v Governor of Lagos State,[28] the Court of Appeal held that the court which delivered a judgment may clarify or correct clerical slips and accidental omissions contained in it. However, where the error or omission concerns a question of law, the court lacks jurisdiction to correct it, even where the error is apparent on the face of the judgment or order.

Conclusion

The law governing the amendment of judgments in Nigeria reflects a carefully calibrated balance between two important, potentially competing values: ensuring that judgments accurately reflect the decisions of the courts that delivered them and preserving the finality of litigation. The doctrine of functus officio establishes the general rule that once a court delivers its final judgment, it exhausts its jurisdiction over the matter and cannot subsequently alter the substance of its decision.

The slip rule and the inherent jurisdiction of courts provide narrow and carefully circumscribed exceptions to this general rule. They permit courts to correct clerical mistakes, accidental slips, omissions and computational errors that do not arise from the judicial decision-making process but merely affect the recording or expression of a decision already reached. These exceptions do not extend to substantive errors, as any attempt by a court to reconsider or alter the merits of its decision would amount to sitting on appeal over its own judgment.

Ultimately, Nigerian jurisprudence on the amendment of judgments demonstrates the judiciary’s commitment to accuracy and finality as complementary pillars of a credible and dependable justice system. A judgment corrected only to remove accidental errors, while remaining unchanged in substance, serves both objectives: it accurately expresses what the court decided while retaining its final and binding character.

Reference: Amendment of judgments, slip rule, functus officio, clerical errors, accidental slips, computational errors, inherent jurisdiction, correction of judgments, finality of litigation, appellate review

1. Learnnigerianlaw, ‘The Judiciary’ (2026) https://www.learnnigerianlaw.com/learn/constitutional-law/judiciary accessed 19 June, 2026. ↑
2. Abiola Mohammed, ‘Understanding the Principles Relating to Clarification of Judgments in Nigeria’ (2025) https://oal.law/understanding-the-principles-relating-to-clarification-of-judgments-in-nigeria/ accessed 19 June, 2026. ↑
3. Integrated Realty Ltd. v. Odofin (2018) 3 NWLR (Pt. 1606) 301 ↑
4. (1995) 3 NWLR (Pt. 381) 50 ↑
5. Alabi v. Ladeji (1986) 5 NWLR (Pt. 42) 423; Odjevwedje v. Echanokpe (1987) 1NWLR (Pt. 52) 633; Bamishebi v. Faleye (1987) 2 NWLR (Pt. 54) 51; Dzungwe v. Gbishe (1985) 2 NWLR (Pt. 8)528; Cardoso v. Daniel (1986) 2 NWLR (Pt. 20) 1 referred to]. (P. 59, paras. A-B) ↑
6. (2005) 5 NWLR (Pt. 1451) 1 ↑
7. Mohammed v. Hussein (1998) 14 NWLR (Pt. 584) 108; Shodeinde v. Reg. Trustees of Ahmadiya Movements-in-Islam (1980) 19 NSCC 70; A.C.B. Ltd. v. Ehiemua (1978) 11 NSCC 55; A.T. Ltd. v. A.D. H. Ltd. (2007) 15 NWLR (Pt. 1056) 118; Dingyadi v. INEC (2011) 11 NWLR (Pt. 1255) 347; Famu v. Kassim (2013) 7 NWLR (Pt. 1352) 166 referred to.] (P. 31, paras. F-G) ↑
8. (2018) 11 NWLR (Pt. 1630) 375 ↑
9. Pp. 387, para. D; 395-396, paras. H-A)Per EKO, J.S.C. at pages 395-396, paras. H-A: ↑
10. Alh. A. AhmedCo. (Nig.) Ltd. v. A.I.B. Ltd. (2001) 10 NWLR (Pt. 721) 391; Asiyanbi v. Adeniji (1967) 1 All NLR 82; NICON v. P.I.E. Ltd.(1990) 1 NWLR (Pt.129) 697; Olurotimi v. Ige (1993) 8 NWLR (Pt.311) 257 referred to.] (P.403, paras. G-H) ↑
11. (2001) 6 NWLR (Pt. 708) 61 ↑
12. Ogunsola v. NICON (1996) 1 NWLR (Pt.423) 126; Ashiyanbi v. Adeniji (1967) AII NLR 82; Adigun v. A.-G., Oyo State (No.2) (1987) 2 NWLR (Pt.56) 197; Minister of Lagos Affairs, Mines & Power v. Akin-Olugbade (1974) 1 AII NLR (Pt.2) 226 referred to.] (P 75, Paras. D-E)Per AD AMU, J.C.A. at pages 73-74, paras. H-H ↑
13. (1995) 2 NWLR (Pt. 376) 201 ↑
14. (P. 213, paras. E-F). ↑
15. U.B.N. Plc. v. C.F.A.O. (Nig.) Ltd (1997) 11 NWLR (Pt. 527) 118; Asiyanbi v. Adeniji (1967) 1 All NLR 82; NICON v. Power & Industrial Engineering Co. Ltd. (1990) 1NWLR (Pt. 129) 697; Olurotimi v. Ige (1993) 8 NWLR (Pt. 311) 257 referred to.] (P.127, paras. D-G) ↑
16. (1995) 9 NWLR (Pt. 420) 478 ↑
17. Asiyanbi v. Adeniji (1967) 1 All NLR 82, Minister of Lagos Affairs Mines and Power v. Akin Olughade (1974) I All NLR (Pt.1)226; Commissioner for Lands. Mid-Western Stale of Nig. v. Edo-Osagie (1973) 6 SC. 155; Bakare v. Apena (1986) 4 NWLR (Pt.33) 1 referred to]. (P.493, A-F) ↑
18. Umunna v. Okwuraiwe (1978)6 & 7SC. 1 at9; N.G.S.C.Ltd. v. N. P A. (1990) 1 NWLR (Pt. 129) 741 referred to] (Pp. 495-496, paras. H-A) ↑
19. (P.493, paras. G; Pp.492-493, paras. H-A) Per ONU, J.S.C.at pages 493-494, paras G-B ↑
20. (2015) 11 NWLR (Pt. 1471) 451 ↑
21. (2010) 17 NWLR (Pt. 1222) 211 ↑
22. (P. 239, paras. G-H) ↑
23. (2000) 4 NWLR (Pt. 654) 584 ↑
24. Constitution of the Federal Republic of Nigeria 1999 (as amended), s 6(6)(a). ↑
25. 2025) 19 NWLR (Pt. 2021) 521 ↑
26. Omoju v. F.R.N. (2008) 7 NWLR (Pt. 1085) 38 referred to.] (P. 560, paras. A-B) ↑
27. (2018) 15 NWLR (Pt. 1641) 161 ↑
28. (2024) 4 NWLR (Pt. 1928) 257 ↑