Correcting a Massachusetts Criminal Sentence: Rule 29, Rule 30(a), and the Limits of Finality

A Massachusetts criminal sentence is not as final as it looks on the day it is imposed, and not as open to revision as clients hope. Three provisions govern what can change afterward: Mass. R. Crim. P. 29, which permits revision or revocation of a disposition within a sixty-day limit; Mass. R. Crim. P. 30(a), which permits correction of an illegal sentence at any time while the defendant remains restrained by it; and, for Superior Court state prison sentences only, the Appellate Division under M.G.L. c. 278, §§ 28A to 28C.

The law that has grown around them is largely a law of limits, and most cases turn on those limits. This guide is written for defense lawyers and collects the current law, through the Supreme Judicial Court’s March 2026 decision in Commonwealth v. Psikarakis, in one place. It applies in the District Court, the Boston Municipal Court, and the Superior Court alike, except where a section says otherwise.

This page covers what happens after a sentence is imposed. The sentencing hearing itself, and the trial before it, appear in the Massachusetts criminal court practice section.

The Two Rules and the Line Between Them

Everything in this area starts with one distinction. A sentence that was lawful but arguably too harsh can be revisited only under Rule 29, within its sixty-day windows. A sentence the law never authorized is governed by a different rule with a different standard.

“An ‘illegal sentence’ is one that is in excess of the punishment prescribed by the relevant statutory provision or in some way contrary to the applicable statute.” Commonwealth v. Layne, 21 Mass. App. Ct. 17, 19 (1985). A sentence is also unlawful where it is “premised on a major misunderstanding by the sentencing judge as to the legal bounds of his authority.” Commonwealth v. McGuinness, 421 Mass. 472, 475 (1995).

The first kind has a deadline. The second has no deadline, though it has limits of its own.

A clerical error in the mittimus or on the docket is a third category, corrected as a clerical matter rather than under either rule. The line is between clerical corrections and “errors of substance” that “trample the defendant’s rightful expectations.” Commonwealth v. Selavka, 469 Mass. 502 (2014), citing Commonwealth v. Miranda, 415 Mass. 1, 5 (1993). Before litigating an illegality, confirm that the sentence imposed in open court and the sentence recorded are the same thing.

This guide addresses the sentence. A challenge to the conviction itself, including newly discovered evidence and a plea attacked for defective advice, proceeds under Mass. R. Crim. P. 30(b), which permits a new trial “at any time if it appears that justice may not have been done.” Dunbrack v. Commonwealth, 398 Mass. 502, 504 (1986). Misfiling one as the other is a recurring waste of a filing.

Rule 29 and Its Sixty-Day Windows

The current rule, effective April 1, 2022, speaks of revision or revocation of a “disposition” rather than a sentence, and provides two avenues that share one deadline.

Under Rule 29(a)(1), the trial judge on the court’s own motion, or the prosecutor by written motion filed within sixty days of a disposition, may revise or revoke a disposition any part of which was illegal. This is the mechanism the Supreme Judicial Court asked the rules committee to create in Selavka, 469 Mass. 502 (2014), so that the Commonwealth would have a defined route to challenge an unlawful sentence. That request has been answered: where Selavka observed that neither rule expressly permitted a Commonwealth motion, Rule 29(a)(1) now expressly does.

Under Rule 29(a)(2), the judge on the court’s own motion, or the defendant by written motion, may seek revision within sixty days of the disposition, within sixty days of the issuance of a rescript by an appellate court on direct review, or within sixty days of the disposition of criminal charges against a codefendant, on the standard that “it appears that justice may not have been done.” Motions are supported by affidavit, may be decided on the affidavits without a hearing, and a final order is appealable by either party.

The amendment history matters for date calculation, and it is easy to get wrong. Rule 29 was amended effective September 1, 2016, and again effective April 1, 2022, as appearing in 489 Mass. 1503 (2022). The codefendant-disposition window is a product of the 2022 amendment; decisions predating it, including Tejeda in 2019, quote a version of Rule 29(a)(2) that does not contain it.

Under the pre-2016 rule the rescript period was measured from receipt by the trial court of a rescript, and the current rule measures it from issuance. Counsel calculating a deadline from an older opinion will calendar the wrong date.

The Jurisdictional Deadline

The sixty days are jurisdictional. “This sixty-day time period established in the rule is absolute and may not be extended.” Commonwealth v. Callahan, 419 Mass. 306, 308 (1995). Accord Commonwealth v. DeJesus, 440 Mass. 147, 151 (2003); Commonwealth v. Fenton F., 442 Mass. 31, 36 (2004). The Appeals Court stated the rule again in Commonwealth v. Perkins, No. 25-P-0597 (Mass. App. Ct. May 8, 2026).

What is jurisdictional is the filing. A motion filed within the sixty days preserves the court’s power even if the hearing comes later, so in any case where the disposition might deserve a second look, the motion should be filed and held rather than considered and missed. A motion filed on day sixty-one is a different matter, and the court is without power to hear it.

Appellate review of a ruling on a timely motion is for abuse of discretion or error of law. Commonwealth v. Tejeda, 481 Mass. 794, 795 to 796 (2019). Review of a ruling under Rule 30(a) is the same. Commonwealth v. Plasse, 481 Mass. 199, 204 (2019); Commonwealth v. Perez, 480 Mass. 562, 567 (2018).

Two decisions are named Layne. The 1982 Supreme Judicial Court decision, 386 Mass. 291, states the jurisdictional-deadline rule; the 1985 Appeals Court decision, 21 Mass. App. Ct. 17, gives the definition of an illegal sentence. Each citation belongs with its own proposition.

The Frozen Record, and Its One Exception

A Rule 29 judge decides whether the disposition was just when imposed, on the facts as they existed at sentencing. The court “may not take into account conduct of the defendant that occurs subsequent to the original sentencing.” Commonwealth v. Barclay, 424 Mass. 377, 380 (1997); DeJesus, 440 Mass. at 152. The judiciary “may not act as [a] super-parole board,” Commonwealth v. Amirault, 415 Mass. 112, 117 (1993), so exemplary conduct in custody, completed programs, and post-sentencing rehabilitation are not grounds. They belong to parole and to clemency.

There is one recognized exception, and it is the reason the codefendant window exists. In Tejeda, 481 Mass. 794 (2019), the Supreme Judicial Court used its superintendence power to “recognize a limited exception to the requirement that motions to revise and revoke be based solely on facts as they existed at the time of sentencing: a judge may consider a disparate sentence of a coventurer, tried separately and subsequently, who was convicted of the same crime where, at the time of sentencing, it is reasonably apparent that the defendant was less culpable than or equally culpable to his or her yet untried coventurer.” 481 Mass. at 796.

The Appeals Court restated it in Perkins (2026): a “judge may take into account a disparity among the sentences of codefendants.”

The coventurer must have been tried separately and subsequently, must have been convicted of the same crime, and the relative culpability must have been reasonably apparent at the time of the defendant’s own sentencing. A codefendant who simply received a better deal later does not satisfy it.

Apart from that exception, the affidavit serves one purpose: to marshal facts contemporaneous with the sentencing that the sentencing judge did not fully absorb, such as health conditions, family circumstances, or employment already in hand.

Two further limits on what Rule 29 can do. The rule permits revision of the sentence, not the finding. A judge may not vacate a guilty finding and enter a continuance without a finding under Rule 29. Commonwealth v. McCulloch, 450 Mass. 483, 489 (2008).

And the rule runs in both directions: “[i]t is well settled that a sentencing judge has the authority under rule 29(a) to increase a sentence previously imposed, provided that the revision takes place within sixty days,” Commonwealth v. Derry, 26 Mass. App. Ct. 10, 11 (1988). A motion filed on a client’s behalf opens the disposition, and counsel should assess that exposure before filing.

The Reasonable-Time Requirement

A timely filed motion may be held for decision, but not indefinitely. The judge must act within a reasonable time, and a delay of six to seven years was unreasonable in Barclay. See McCulloch, 450 Mass. at 487. Counsel who file protectively should calendar the motion and press for a hearing date rather than let it age, because a motion decided years out invites both the reasonable-time objection and the practical reality that the deciding judge may no longer recall the session.

The Illegal Sentence and Rule 30(a)

The sixty-day limit does not convert an unlawful sentence into a lawful one. Rule 30(a), as appearing in 435 Mass. 1501 (2001), provides: “Any person who is imprisoned or whose liberty is restrained pursuant to a criminal conviction may at any time, as of right, file a written motion requesting the trial judge to release him or her or to correct the sentence then being served upon the ground that the confinement or restraint was imposed in violation of the Constitution or laws of the United States or of the Commonwealth of Massachusetts.”

The rule was designed “to enable defendants to challenge the legality or the technical basis of a sentence,” not to provide plenary appellate review. Commonwealth v. Christian, 429 Mass. 1022, 1023 (1999), a rescript opinion.

Christian provides the working example: a defendant originally given a three-year suspended sentence who, after revocation, is ordered to serve four years may move under Rule 30(a), because the fourth year was beyond the judge’s authority.

The same decision draws the boundary: Rule 30(a) applies to the sentence imposed after a probation revocation, not the validity of the revocation order itself, which is reviewed on direct appeal. Accord Commonwealth v. Bruzzese, 437 Mass. 606 (2002).

Three limits apply.

The restraint requirement is broader than imprisonment. Rule 30(a) permits a defendant to “seek release from illegal confinement or other restraint on their liberty,” and to correct an illegal sentence “at any point while the defendant’s liberty is restricted.” Martin v. Commonwealth, 492 Mass. 74 (2023). Probation is a restraint on liberty. A probationer serving an unlawful term is not outside the rule. A sentence already fully served presents a different problem, and counsel should assess mootness before promising relief.

The ground must be illegality. It must be illegality in the Layne and McGuinness sense, not inequity. A lawful sentence that is merely harsh belongs to Rule 29 and its deadline, and relabeling it does not change its character.

A Rule 30(a) motion involves risk. A defendant who attacks one component of a sentencing scheme may expose the whole scheme to restructuring, as the court observed of the defendant in Commonwealth v. Cumming, 466 Mass. 467, 471 (2013), who had “knowingly exposed himself to the possibility that his entire sentencing scheme might be restructured.”

Where an untimely Rule 29 motion is aimed in substance at an illegal sentence, the better course is to file under Rule 30(a), or to ask the court to treat the mislabeled filing as a Rule 30(a) motion. The substance of the challenge, not its caption, determines which rule’s limits apply.

Finality and Double Jeopardy

The boundary on the correction power runs in the defendant’s favor. Even an illegal sentence acquires, with the passage of time, a finality that bars further punitive changes detrimental to the defendant. Selavka, 469 Mass. at 513 to 515, where a GPS condition the statute required but the judge omitted could not be added months after sentencing.

The protection holds even where the original sentence failed to comply with a statutory minimum: “Absent some action during this [sixty-day] window [under rule 29(a)], the time for the appellate process has come to an end, and the defendant has a reasonable expectation of finality in the sentence, even an illegal one.” Martin v. Commonwealth, 492 Mass. 74, 79 to 80 (2023), applying the rule to a sentence imposed by the Appellate Division itself.

The governing factors come from Commonwealth v. Ellsworth, 485 Mass. 29, 34 (2020): whether the original sentence was legal or illegal, the timeliness of a motion to revise or revoke, and whether the sentence has been fully served. Timeliness is one factor and not a trump. Ellsworth itself is the counterexample: the Commonwealth filed a timely motion and double jeopardy still barred resentencing, because two years had passed and any remaining terms would have been satisfied shortly.

The Supreme Judicial Court’s newest word shows the other side of the line. In Commonwealth v. Psikarakis, SJC-13792, decided March 20, 2026, consolidated with Commonwealth v. Maurice M. Smith, SJC-13796, the defendants’ state prison terms of one year to a year and a day for possessing a large capacity firearm were unlawful because M.G.L. c. 269, § 10(m) requires a maximum term of at least two and one half years.

The Commonwealth had said so at the plea, filed its Rule 29(a)(1) motion the same day sentence entered, and appealed the denial immediately. On those facts the Court held that no legitimate expectation of finality had formed, and resentencing was permitted even though one defendant had fully served the illegal sentence. Justice Wendlandt dissented, arguing that the majority had created a novel mandatory minimum maximum.

Psikarakis should be read on its facts rather than as a general rule. The Court did not hold that a timely Commonwealth motion always defeats finality, and it expressly did not decide what happens where the Commonwealth fails to file within the sixty days. Timeliness together with an active appellate process is what made the difference there.

The Reporter’s Notes to Rule 29(a) state the division of labor after the sixty days lapse: any motion to revise or revoke an illegal sentence “must come from the defendant under [rule 30(a)], which would raise no double-jeopardy problems.”

A defendant’s expectation of finality “is not absolute: it is diminished when he or she files a motion for postconviction relief,” a successful challenge to one sentence in a package “opens up all the interdependent, lawful sentences for reconsideration without violating the double jeopardy clause,” and time served “must be fully subtracted from any new sentence.” Perez v. Commonwealth (Mass., decided July 30, 2025).

For the defense, the first question is whether the Commonwealth filed within the sixty days. Where the Commonwealth misses the window, the sentence stands under Selavka and Martin. Where it files within the window, the argument moves to the merits under Psikarakis.

Changing Probation Conditions After Sentencing

The same finality principles govern modification of probation conditions. A judge may clarify a condition stated in general or ambiguous terms, but may enlarge the scope of probation only where there has been a material change in the probationer’s circumstances, and never so as to be so punitive as to significantly increase the severity of the original probation.

In Commonwealth v. Muniz Rodriguez, 494 Mass. 723 (2024), the addition of GPS exclusion zones after sentencing survived double jeopardy only because the original sentence expressly contemplated that zones would be set. The zones as drawn, covering two entire cities, were vacated as a banishment that increased the sentence. The case frames both sides of the docket: what was contemplated at sentencing may later be specified, and what was not contemplated may not later be added.

The Appellate Division of the Superior Court

For Superior Court sentences to state prison, one more route exists. M.G.L. c. 278, § 28A creates an Appellate Division to review “sentences to the state prison imposed by final judgments in criminal cases, except in any case in which a different sentence could not have been imposed,” and also reformatory-for-women sentences of more than five years. That exception matters, because a mandatory sentence is not reviewable, and an appeal filed on one is dead on arrival.

Section 28B gives the defendant ten days from imposition of the sentence to file the appeal with the clerk for the county where judgment was rendered. The review involves risk as well as opportunity: the division may substitute “any other disposition of the case which could have been made at the time of the imposition of the sentence,” and “no sentence shall be increased without giving the defendant an opportunity to be heard.” Under Martin, a sentence the Appellate Division imposes acquires the same sixty-day finality as any other.

The District Court and the Boston Municipal Court cannot commit to state prison, so as a practical consequence their sentences are not reviewable by the Appellate Division. Correction practice in those courts runs through Rule 29, Rule 30(a), and the appeal of the conviction. The sentencing structures of those two courts are treated in the office’s practitioner’s guide to sentencing in the District Court and Boston Municipal Court.

Practice Pointers

File the Rule 29 motion protectively within sixty days in any case where the disposition might deserve revisiting, and calendar the rescript and codefendant windows, which practitioners overlook more often than the primary one. Calculate the rescript deadline from issuance, not receipt.

Build the affidavit from sentencing-day facts, and say so expressly, because the frozen-record rule is the most common ground of denial. Where a codefendant tried separately and later received a disparate sentence, plead Tejeda and its conditions specifically rather than relying on the codefendant window alone.

Match the motion to the defect. Illegality goes to Rule 30(a) at any time while the client is restrained, which includes probation. Inequity goes to Rule 29 within the sixty days. Where a filing straddles the line, plead Rule 30(a) in the alternative and ask the court to reach the illegality even if the Rule 29 branch is untimely. Where the target is the conviction rather than the sentence, the motion is under Rule 30(b).

Check the mittimus and the docket before litigating an illegality, because a clerical discrepancy is corrected without any of this.

Before filing under Rule 30(a), weigh the Cumming risk that the whole scheme reopens, confirm the client is still restrained by the sentence under attack, and remember that Rule 29 permits an increase as well as a reduction.

When the Commonwealth moves to correct upward, start with the dates. If its motion came after the sixty days, Selavka, Martin, and the double jeopardy principles they rest on should end the inquiry before the merits begin. If it came within the window, Ellsworth still supplies factors beyond timeliness.

Where a client faces a probation violation on a suspended sentence the court had no authority to impose, the violation session is not too late to raise the illegality, and Christian is the vehicle.

Serpa Law Office defends criminal cases and sentencing litigation in the District Courts, the Boston Municipal Court, and the Superior Courts of Greater Boston. Referring counsel may contact Attorney Serpa at 617.936.0201.

Last Reviewed: August 2026