KELLER, P.J.,
delivered the opinion of the Court
in which KEASLER, HERVEY, HOLCOMB and COCHRAN, JJ., joined.
We must determine whether a defendant may collaterally attack a prior judgment of conviction used to enhance a new offense, in the trial of that new offense, on the ground that the prior judgment was too lenient. We hold that he cannot.
I. BACKGROUND
A. Trial
Appellant was serving time in prison for burglary (three years) and aggravated sexual assault (forty-five years). He was bench-warranted to Smith County to answer for a theft offense. While in the Smith County jail, he escaped. He was ultimately convicted on both the theft and escape charges. He was sentenced to two years in state jail for the theft and ten years in prison for the escape. The escape sentence was ordered to be run concurrently with the theft sentence. The written judgment for the escape conviction is silent as to whether the escape sentence was to run concurrently to or consecutively with appellant’s prior burglary and aggravated sexual assault sentences. This written judgment is also silent concerning whether or not there was a plea agreement.
Appellant later committed more crimes and was ultimately charged with new felony offenses of escape, burglary of a habitation, and theft. The State alleged two prior judgments of conviction for enhancement purposes.1 One of those prior judgments was for the Smith County escape case. Appellant filed a motion to quash that enhancement allegation. Relying upon Article 42.08 of the Code of Criminal Procedure, he claimed that the judgment was void because the escape sentence was run concurrently with his other sentences when the statute required that it be cumu-lated with the earlier burglary and sexual assault sentences he was serving at the time he committed the escape.2
[885]*885The State presented three responses to appellant’s claim: (1) Article 42.08(b) did not require the escape judgment to be stacked because appellant was not actually “in” the prison system at the time of the escape, since he had been bench-warranted to the Smith County jail. (2) Even if the judgment had to be stacked, the absence of stacking did not make the judgment void and the deficiency could be corrected in a nunc pro tunc order. (3) Equitable notions of justice should prevent the defendant from gaining the benefit of concurrent sentencing and then turning around to complain about it later.
The trial court denied appellant’s motion, the enhancement allegations were subsequently found to be true, and appellant was sentenced as an habitual offender on all three offenses, receiving sentences of thirty-three years, twenty-five years, and twenty-five years, respectively.
B. Appeal
In his sole point of error on appeal, appellant re-urged his contention that the Smith County escape judgment was void. In response, the State re-urged the first argument it had made at trial.3 The court of appeals found that Article 42.08(b) required that the sentence for the Smith County escape be stacked onto the sen-fence for the prior aggravated sexual assault,4 and it found that the failure to stack rendered the prior judgment void and thus unusable for enhancement purposes.5 As a result, the court of appeals reversed the judgment of the trial court and remanded the case for a new punishment hearing.6
The State filed a motion for rehearing, repeating its original argument and making the following additional arguments: (1) a prior conviction can be valid for enhancement purposes even if the sentence is void, (2) the trial court had no evidence before it that appellant met the criteria outlined in Article 42.08(b), (3) appellant bargained for the punishment obtained and cannot now complain of an action he earlier requested, and (4) a cumulation order is not part of the sentence. Appellant filed a response to the State’s motion. In responding to argument (3) above, appellant acknowledged that he “did enter into a plea bargain for his sentence in the Smith County escape case” but claimed that he did not “invite” the error as a result. The motion for rehearing was denied.
En banc consideration was also requested but denied. In an opinion dissenting from the denial of en banc consideration, Justice Keyes argued that a cumulation [886]*886order is not part of a sentence, so its absence could not render a sentence void.7
C. Discretionary Review
In its petition for discretionary review, the State raises several issues, which can be summarized as follows: (1) whether appellant was estopped from complaining that his sentence was illegal, (2) whether a defendant’s constitutional rights would be violated by a nunc pro tunc order that would make the sentences run consecutively, (3) what is the legal effect of a failure to order a sentence to run consecutively as required by Article 42.08(b), and (4) what amount of evidence is required to invoke the mandatory provisions of Article 42.08(b).8
In arguing the estoppel question, the State claims that appellant entered into a plea agreement for his sentence on the Smith County escape charge. In his response brief, appellant contends that there is no evidence in the record to prove that his conviction was the result of an agreement.9 Our review of the trial rec[887]*887ord in the present case reveals that there was indeed no indication that the parties entered into a plea agreement. The trial record contains no court reporter’s record or plea papers that might have shed light on whether a plea agreement existed, and the trial record does not otherwise contain any indication of a plea agreement. However, nothing in the trial record specifically refutes the existence of a plea agreement either, and as we observed above, appellant conceded the existence of a plea agreement in a pleading before the court of appeals. But even if we assume there was a plea agreement, we have no information concerning its terms, and more specifically, whether the terms included concurrent sentencing, unless we construe the State’s contention that there was a plea agreement as an admission10 to that effect.11
II. ANALYSIS
We need not decide whether to treat this case as involving a plea agreement with respect to the concurrent sentencing issue. As we shall explain, if there was no plea agreement on the concurrent sentencing issue, then the judgment is not void, and thus not subject to collateral attack, because it was at some point in time subject to reformation.12 If there was a plea agreement on the concurrent sentencing issue, then appellant is estopped from challenging the judgment. We detail our reasoning on these points below.
A. No Agreement Means Judgment Is Not Void
Appellant’s challenge to the enhancement allegation in this case constitutes a collateral attack on the prior judgment of conviction.13 Such a collateral attack is permitted only if the prior judgment is void, and not merely voidable.14
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KELLER, P.J.,
delivered the opinion of the Court
in which KEASLER, HERVEY, HOLCOMB and COCHRAN, JJ., joined.
We must determine whether a defendant may collaterally attack a prior judgment of conviction used to enhance a new offense, in the trial of that new offense, on the ground that the prior judgment was too lenient. We hold that he cannot.
I. BACKGROUND
A. Trial
Appellant was serving time in prison for burglary (three years) and aggravated sexual assault (forty-five years). He was bench-warranted to Smith County to answer for a theft offense. While in the Smith County jail, he escaped. He was ultimately convicted on both the theft and escape charges. He was sentenced to two years in state jail for the theft and ten years in prison for the escape. The escape sentence was ordered to be run concurrently with the theft sentence. The written judgment for the escape conviction is silent as to whether the escape sentence was to run concurrently to or consecutively with appellant’s prior burglary and aggravated sexual assault sentences. This written judgment is also silent concerning whether or not there was a plea agreement.
Appellant later committed more crimes and was ultimately charged with new felony offenses of escape, burglary of a habitation, and theft. The State alleged two prior judgments of conviction for enhancement purposes.1 One of those prior judgments was for the Smith County escape case. Appellant filed a motion to quash that enhancement allegation. Relying upon Article 42.08 of the Code of Criminal Procedure, he claimed that the judgment was void because the escape sentence was run concurrently with his other sentences when the statute required that it be cumu-lated with the earlier burglary and sexual assault sentences he was serving at the time he committed the escape.2
[885]*885The State presented three responses to appellant’s claim: (1) Article 42.08(b) did not require the escape judgment to be stacked because appellant was not actually “in” the prison system at the time of the escape, since he had been bench-warranted to the Smith County jail. (2) Even if the judgment had to be stacked, the absence of stacking did not make the judgment void and the deficiency could be corrected in a nunc pro tunc order. (3) Equitable notions of justice should prevent the defendant from gaining the benefit of concurrent sentencing and then turning around to complain about it later.
The trial court denied appellant’s motion, the enhancement allegations were subsequently found to be true, and appellant was sentenced as an habitual offender on all three offenses, receiving sentences of thirty-three years, twenty-five years, and twenty-five years, respectively.
B. Appeal
In his sole point of error on appeal, appellant re-urged his contention that the Smith County escape judgment was void. In response, the State re-urged the first argument it had made at trial.3 The court of appeals found that Article 42.08(b) required that the sentence for the Smith County escape be stacked onto the sen-fence for the prior aggravated sexual assault,4 and it found that the failure to stack rendered the prior judgment void and thus unusable for enhancement purposes.5 As a result, the court of appeals reversed the judgment of the trial court and remanded the case for a new punishment hearing.6
The State filed a motion for rehearing, repeating its original argument and making the following additional arguments: (1) a prior conviction can be valid for enhancement purposes even if the sentence is void, (2) the trial court had no evidence before it that appellant met the criteria outlined in Article 42.08(b), (3) appellant bargained for the punishment obtained and cannot now complain of an action he earlier requested, and (4) a cumulation order is not part of the sentence. Appellant filed a response to the State’s motion. In responding to argument (3) above, appellant acknowledged that he “did enter into a plea bargain for his sentence in the Smith County escape case” but claimed that he did not “invite” the error as a result. The motion for rehearing was denied.
En banc consideration was also requested but denied. In an opinion dissenting from the denial of en banc consideration, Justice Keyes argued that a cumulation [886]*886order is not part of a sentence, so its absence could not render a sentence void.7
C. Discretionary Review
In its petition for discretionary review, the State raises several issues, which can be summarized as follows: (1) whether appellant was estopped from complaining that his sentence was illegal, (2) whether a defendant’s constitutional rights would be violated by a nunc pro tunc order that would make the sentences run consecutively, (3) what is the legal effect of a failure to order a sentence to run consecutively as required by Article 42.08(b), and (4) what amount of evidence is required to invoke the mandatory provisions of Article 42.08(b).8
In arguing the estoppel question, the State claims that appellant entered into a plea agreement for his sentence on the Smith County escape charge. In his response brief, appellant contends that there is no evidence in the record to prove that his conviction was the result of an agreement.9 Our review of the trial rec[887]*887ord in the present case reveals that there was indeed no indication that the parties entered into a plea agreement. The trial record contains no court reporter’s record or plea papers that might have shed light on whether a plea agreement existed, and the trial record does not otherwise contain any indication of a plea agreement. However, nothing in the trial record specifically refutes the existence of a plea agreement either, and as we observed above, appellant conceded the existence of a plea agreement in a pleading before the court of appeals. But even if we assume there was a plea agreement, we have no information concerning its terms, and more specifically, whether the terms included concurrent sentencing, unless we construe the State’s contention that there was a plea agreement as an admission10 to that effect.11
II. ANALYSIS
We need not decide whether to treat this case as involving a plea agreement with respect to the concurrent sentencing issue. As we shall explain, if there was no plea agreement on the concurrent sentencing issue, then the judgment is not void, and thus not subject to collateral attack, because it was at some point in time subject to reformation.12 If there was a plea agreement on the concurrent sentencing issue, then appellant is estopped from challenging the judgment. We detail our reasoning on these points below.
A. No Agreement Means Judgment Is Not Void
Appellant’s challenge to the enhancement allegation in this case constitutes a collateral attack on the prior judgment of conviction.13 Such a collateral attack is permitted only if the prior judgment is void, and not merely voidable.14
[888]*888Initially, we point out that there is a difference between an entire judgment being “void” and a portion of a judgment being “void.” For example, a judgment may contain two or more sentencing elements (e.g. imprisonment and fine), one of which may be valid while the other is void.15 When only one of the sentencing elements is void, the judgment is rendered void only if the judgment cannot be reformed to cure the infirmity (i.e. the infirmity cannot be cured without resort to resentencing).16 Some cases addressing other types of judgment defects have likewise indicated that the judgment is not void if the defect could have been reformed on the direct appeal of the judgment in question17 or in a nunc pro tunc order.18
This Court has addressed at least three different curable judgment defects relating to punishment that arose from a contested trial, in which there was no plea agreement. In Williams v. State, we confronted on direct appeal a claim that a cumulation order was void.19 We agreed, and we deleted the cumulation order but otherwise affirmed the conviction.20
In Ex parte Johnson, an applicant claimed on habeas corpus that his conviction for aggravated robbery was void because it contained an unauthorized fine.21 The jury had rendered a verdict assessing punishment at fifty years of confinement and a $10,000 fine, but according to the habitual-sentencing statute under which the applicant was punished, no fine was authorized.22 We held that the trial court was empowered to reform the judgment by deleting the unauthorized fine.23
In Barker v. State, the defendant did what appellant did here: he challenged a prior conviction used for enhancement purposes at the trial of a new offense.24 He claimed that the prior judgment was void because, in addition to a valid three-day jail sentence and fifty-dollar fine, the judgment contained an invalid provision commuting the sentence to a six-month term of probation.25 We rejected the defendant’s contention.26 First, we relied upon Ex parte King for the proposition that “a judgment or sentence containing an irregularity which may be reformed on appeal or by nunc pro tunc entry is not void, and may not be collaterally attacked.”27 Sec[889]*889ond, we cited Lenore v. State for the proposition that “a prior judgment providing for a fine of $25 when the minimum punishment provided by law was a $100 fine was erroneous, but not void, and was available for enhancement of punishment in a prosecution for a subsequent offense.”28
Clearly, where concurrent sentencing is not a part of a plea agreement, reforming the judgment to make the sentence consecutive can be accomplished without resort to resentencing. We have already held that a cumulation order can be deleted without disturbing the remainder of the judgment. Imposing a cumulation order where one is required is simply the flip side of the coin. This type of situation does not involve a range of valid possible punishment options that would require a new sentencing hearing to be held. If concurrent sentencing between two sentences (here the escape and the prior aggravated sexual assault) is invalid, then only one valid option remains (consecutive sentencing), making reformation possible, at the very least, on direct appeal.
We need not decide whether the defect here is itself of the void or voidable variety,29 whether it is even voidable at all,30 or whether a cumulation order (or lack thereof) is part of the “sentence.”31 However one characterizes the defect of failing to cumulate appellant’s sentence in the prior escape judgment, the reformable nature of the defect means that it cannot render the prior judgment void.32
B. Agreement Means Appellant Is Es-topped from Challenging the Judgment
This Court has not, in a majority opinion, addressed the application of the estoppel doctrine in circumstances such as these. But the issue was discussed in a plurality opinion on rehearing in Heath v. State33 and in a concurring opinion in Ex parte Williams,34 both of which involved a defendant challenging a prior plea-bargained judgment of conviction on the ground that the trial judge imposed probation without the authority to do so.35 The Heath plurality decided that the doctrine of estoppel would not bar a plea-bargain[890]*890ing defendant’s challenge to an illegal sentence.36 By contrast, the Williams concurrence concluded that the plea-bargaining defendant in that case was estopped from challenging the trial court’s judgment because he had accepted the benefits of probation.37 Although a majority of the Court in Williams chose to deny relief upon a different ground,38 this Court has subsequently suggested that the estoppel issue raised by the concurring opinion is an open question.39
An examination of the plurality opinion in Heath reveals that its holding on the estoppel issue was based upon a faulty premise. Immediately before reaching its conclusion, the plurality discussed Shannon v. State40 The Heath plurality pointed out that, in Shannon, the defendant was sentenced to two years of confinement in accordance with a plea agreement, but he contended on appeal that the offense for which he was sentenced was actually a Class A misdemeanor with a maximum punishment of one year.41 The court of appeals in Shannon agreed, but remanded the case for resentencing.42 In a petition for discretionary review, the State correctly argued that because there was a plea bargain, the proper remedy was to undo the entire plea.43 We agreed.44 The court of appeals in Shannon had erroneously applied to the negotiated plea setting the rule that error affecting only punishment results in only a new sentencing hearing.45
The Heath plurality then made an illogical leap: it assumed that the mistake made by the court of appeals in Shannon (which never applied the doctrine of estoppel) was somehow an assumption underlying the doctrine of estoppel.46 Without any explanation other than the unsupported assumption that Shannon somehow had something to do with the issue at hand, the Heath plurality reached the odd conclusion that applying estoppel to bar a plea-bargaining defendant’s complaint about an illegally lenient sentence would result in “treating those errors as punishment errors only” and somehow involving resen-tencing. But this proposition makes no sense. The Heath plurality took the premise that it is unfair to bind just one party to a plea bargain, and concluded from this that when a sentence is void, both parties must be unbound from the plea bargain. The alternative the Heath plurality overlooked was that both parties could be bound by the plea bargain — which is precisely what estoppel would accomplish. We thus conclude that the Heath plurality lacks persuasive force.
Acknowledging a “dearth of Texas case-[891]*891law” on the subject,47 the Williams concurrence cited Pry stash v. State,48 which applied to the somewhat different “invited error” context, and out-of-state cases that were more on point.49 We now turn to a full examination of the authorities relating to this subject.
We have previously dealt in Prystash v. State with a type of estoppel involving unilateral requests that result in “invited error,” but estoppel is a flexible doctrine that manifests itself in various forms that are not limited to unilateral requests. The variant of estoppel at issue here is “estoppel by judgment.”50 In this type of estoppel, “[o]ne who accepts the benefits of a judgment, decree, or judicial order is estopped to deny the validity or propriety thereof, or of any part thereof, on any grounds; nor can he reject its burdensome consequences.”51 The only exception to this principle is for challenges to the subject-matter jurisdiction of the court rendering the judgment.52
Moreover, a close cousin of “estoppel by judgment” is “estoppel by contract,” where a party who accepts benefits under a contract is estopped from questioning the contract’s existence, validity, or effect.53 So estoppel can apply not only to unilateral requests (as in Prys-tash), but also in the context of agreements, where the “request” is mutual. As is true with most contracts, it is typical that both parties to a plea bargain will benefit from the judgment.
Indeed, courts in several other jurisdictions have held that a defendant cannot enter a plea agreement that imposes an illegal sentence, benefit from that sentence, and then attack the judgment later when it is suddenly in his interests to do so.54 In rejecting a defendant’s claim for overturning a too-lenient, illegal sentence, the Mississippi Court of Appeals anticipated exactly what applicant wishes to accomplish in the present case:
On the other hand, a defendant should not be allowed to reap the benefits of an illegal sentence, which is lighter than [892]*892what the legal sentence would have been, and then turn around and attack the legality of the illegal, lighter sentence when it serves his interest to do so. Allowing such actions would [wreak] havoc upon the criminal justice system in this state. For example, all subsequent convictions and sentences of that defendant which are reliant upon the conviction concomitant with the illegal sentence would have to be set aside. This would result in a number of enhanced and habitual offender sentences being set aside for the very offender who had already enjoyed greater leniency than the law allows.55
For the same reasons, that court refused to grant relief in a later case when the defendant challenged a prior unauthorized probation after it had been revoked and used to enhance a later offense.56
We find these cases persuasive. A defendant who has enjoyed the benefits of an agreed judgment prescribing a too-lenient punishment should not be permitted to collaterally attack that judgment on a later date on the basis of the illegal leniency.57 Here, appellant received a judgment that was illegally lenient by having his sentence run concurrently instead of consecutively. Had he complained about the illegal leniency at the time of trial, or even on direct appeal, the State could likely have obtained a legal judgment that would now be available for enhancement purposes. But instead, appellant quietly enjoyed the benefits of the illegally lenient judgment, challenging it now only because, due to his own subsequent criminal conduct, the judgment can be used to enhance his punishment for a new offense. If he agreed to the concurrent sentencing provision, then through his own conduct he helped procure and benefit from the illegality and he should not now be allowed to complain.
The judgment of the court of appeals is reversed, and the judgment of the trial court is affirmed.
MEYERS, WOMACK and JOHNSON, JJ., joined Parts I and IIA and dissented to Part IIB.
PRICE, J., filed a dissenting opinion.