OPINION
In this workers’ compensation case, we review on certiorari whether an employer waived a retirement presumption in the Workers’ Compensation Act by failing to expressly reserve the presumption in a stipulation for settlement. Relator Ford Motor Company asserts that it was entitled to cease payment of permanent total disability benefits when respondent George Frandsen turned 67 years old pursuant to a provision in Minn.Stat. § 176.101, subd. 4 (2010), which states: “Permanent total disability shall cease at age 67 because the employee is presumed retired from the labor market. This presumption is rebuttable by the employee.” Frandsen objected to Ford’s petition to discontinue benefits. The Workers’ Compensation Court of Appeals (WCCA) denied the petition on the grounds that Ford failed to expressly reserve the right to assert the retirement presumption in a stipulation for settlement that the parties entered into in April 2007. Ford sought review by certiorari. We reverse and remand the case for further proceedings.
The facts of this case are not in dispute. Frandsen was employed by Ford Motor Company (Ford) on November 3, 2004, when Frandsen was injured in the course and scope of his employment. Ford assumed responsibility for the injury and paid Frandsen medical, rehabilitation, and temporary total disability (TTD) benefits pursuant to the Minnesota Workers’ Compensation Act. See Minn.Stat. ch. 176 (2004). Frandsen was subsequently found to be disabled under the Social Security Act, 42 U.S.C. ch. 7 (2002), and began receiving Social Security Disability Insurance (SSDI) on August 1, 2005. From August 1, 2005, through March 25, 2007, Frandsen received both workers’ compensation TTD benefits and SSDI.
In April 2007, the parties entered into a stipulation for settlement of Frandsen’s workers’ compensation claims. The parties agreed that Frandsen was permanently and totally disabled as a result of his workplace injury. Consequently, the parties agreed to reclassify the TTD benefits that Ford had previously paid to Frandsen as permanent total disability (PTD) benefit payments. See Minn.Stat. § 176.101, subd. 4. This reclassification from TTD to PTD benefits permitted the parties to stipulate that, as of March 23, 2006, Ford had paid Frandsen $25,000 in PTD compensation. Under Minn.Stat. § 176.101, subd. 4, once an employer has paid an employee $25,000 in PTD benefits, the employee’s weekly compensation is “reduced by the amount of any disability benefits being paid by any government disability benefit program” if the benefits are occasioned by the same workplace injury. Because the PTD benefits Frandsen received after March 23, 2006 should have been offset by the amount he received in SSDI benefits,
In addition to recognizing this overpayment, the parties’ stipulation contained several provisions allowing Ford to recoup its overpayment. First, the parties agreed that Frandsen was entitled to permanent partial disability (PPD) benefits in the anticipated amount of $19,950. See Minn. Stat. § 176.101, subd. 2a(a) (2004). Of that $19,950 in PPD benefits, the settlement provided that Frandsen’s attorney would receive $13,000 and the remaining $6,950 would be applied to Ford’s overpayment. The parties also agreed that any additional PPD benefits that Frandsen was entitled to receive would be applied to Ford’s overpayment.
Second, the parties agreed that Ford could reduce the amount of weekly PTD payments to Frandsen to offset Ford’s overpayment. See Minn.Stat. § 176.179 (2010) (stating that in the event of overpayment to an employee entitled to receive further benefits, “the mistaken compensation may be taken as a partial credit against future periodic benefits”). The settlement required that $52.43 per week would be withheld from Frandsen’s benefits and applied to Ford’s overpayment. The parties agreed to adjust that offset amount “annually on [the] date of [Frand-sen’s] injury, and annually when [Frand-sen’s] social security benefit is increased.”
Finally, Ford expressly reserved its right under the Workers’ Compensation Act to bring subrogation and indemnity claims. The stipulation does not mention the discontinuance of benefits or the statutory retirement presumption. The parties submitted the signed stipulation to the Office of Administrative Hearings on April 27, 2007, and a compensation judge approved the settlement and issued an award on stipulation.
On September 14, 2010, Ford petitioned the WCCA to discontinue payment of Frandsen’s PTD benefits pursuant to Minn.Stat. § 176.101, subd. 4, which states that “[permanent total disability shall cease at age 67 because the employee is presumed retired from the labor market.” Frandsen turned 67 years old on February 10, 2010. Ford argued that Frandsen could not rebut this retirement presumption because in a deposition taken July 14, 2010, Frandsen testified that he planned to retire when he reached the “Rule of 85”— the number of years Frandsen worked at Ford plus his age — which would have occurred when Frandsen was 66 years old. Frandsen objected to Ford’s petition to discontinue benefits by stating that “[t]he employee alleges that he is entitled to ongoing permanent total disability.” Frandsen did not state whether he was arguing that the retirement presumption did not apply or that he could rebut the presumption at an evidentiary hearing.
The WCCA denied Ford’s petition to discontinue payment of Frandsen’s PTD benefits. Frandsen v. Ford Motor Co., No. WC10-5175,
I.
The disposition of this case involves statutory and contractual interpretation, both of which are “legal issues subject to de novo review.” State ex rel. Humphrey v. Philip Morris USA, Inc.,
Minnesota Statutes § 176.101, subd. 4, governs the receipt of PTD benefits. The relevant portion of that statute states:
Permanent total disability shall cease at age 67 because the employee is presumed retired from the labor market. This presumption is rebuttable by the employee. The subjective statement the employee is not retired is not sufficient in itself to rebut the presumptive evidence of retirement but may be considered along with other evidence.
Minn.Stat. § 176.101, subd. 4. This provision, by its own terms, is a rebuttable statutory presumption, or “[a] legal inference or assumption that a fact exists.” Black’s Law Dictionary 1304 (9th ed.2009). A presumption shifts the burden of production or persuasion to the opposing party. Id. Furthermore, the Legislature has specifically stated that the word “ ‘[s]hall’ is mandatory.” Minn.Stat. § 645.44, subd. 16 (2010). Thus, according to the plain language of Minn.Stat. § 176.101, subd. 4, an employer’s statutory obligation to pay PTD benefits ends when the employee turns 67 years old, unless the employee can rebut the presumption of retirement by a preponderance of the evidence. See Grunst v. Immanuel-St. Joseph Hosp.,
To decide whether Ford waived the retirement presumption in Minn.Stat. § 176.101, subd. 4, we must engage in a two-part inquiry. First, we must consider whether waiver must be affirmatively asserted in a stipulation for settlement or whether the retirement presumption can be waived through inaction by the employer. Second, we must apply our approach to the first question to the facts of this case to determine whether Ford’s failure to expressly reserve the retirement presumption waived the presumption. We analyze these issues in turn.
II.
Assuming that the employer has the power to waive the retirement presumption,
Waiver is the intentional relinquishment of a known right. Valspar Refinish, Inc. v. Gaylord’s Inc.,
The WCCA erroneously concluded that waiver can be implied from mere inaction by the parties. See Frandsen,
Applying this rule to the retirement presumption, it is clear that the plain language in MinmStat. § 176.101, subd. 4, requires an employee to produce evidence to demonstrate that inaction by an employer was intended to waive the retirement presumption. As discussed above, the retirement presumption and the corresponding cessation of PTD benefits is a mandatory provision of the Workers’ Compensation Act. See MinmStat. §§ 176.101, subd. 4, 645.44, subd. 16. According to its plain language, Minn.Stat. § 176.101, subd. 4, affords an employer the right to presume that an employee would have retired at age 67 and, correspondingly, to stop paying PTD benefits without taking any action prior to this cessation.
To require an employer to expressly reserve the right to rely upon the retirement presumption improperly relieves the employee of his or her burden to either rebut the presumption by a preponderance of the evidence or to prove that the employer knowingly and intentionally waived the presumption. Therefore, we hold that the retirement presumption shall apply unless the employee rebuts the presumption or proves knowing and intentional waiver by the employer.
III.
When deciding whether a party has waived a right, “[e]ach case must rest on its own facts.” Beck v. Spindler,
The WCCA reviewed the parties’ stipulation and concluded, “The settlement agreement in this case contains no language from which we can reasonably conclude the parties intended that permanent total disability benefits would cease when the employee reached 67 years of age.” Frandsen,
After conducting our own review of the stipulation, we find no indication that Ford intended to waive the retirement presumption. The stipulation contains no durational language from which we can infer the length of time that Ford intended to pay PTD benefits to Frandsen. The lack of information about future benefits is unsurprising because the parties agree that this settlement was a “to-date” stipulation intended to settle only those claims out
Frandsen argues that our holding in Stephenson, supports 'affirmance of the WCCA decision in this case. In Stephenson, we held that an employer’s failure to expressly reserve in a stipulation the right to bring third-party claims resulted in waiver of those claims.
Finally, it is important to note that whether an employer intended to waive the retirement presumption is a factually-intensive inquiry; here, the employee cites to no affirmative actions by the employer, language in the stipulation, or circumstances surrounding the agreement that show such an intention and we have found none. In fact, the employee conceded at oral argument that there was no evidence of any discussion of the retirement presumption at the time of the stipulation let alone an affirmative waiver by the employer. At the end of the day, the employee’s position is essentially that entering into a stipulation with the implied knowledge of the existence of the retirement presumption is enough to establish an employer waiver. We disagree. The employee has the burden to come forward with at least some evidence of waiver and we need not decide here what is the minimum level of evidentiary support that the employee must produce. It is sufficient for purposes of the present dispute to simply note that waiver of the retirement presumption is not established without some evidence of intent on the part of the employer and no such evidence was produced here.
In conclusion, we hold that the Workers’ Compensation Court of Appeals erred when it denied Ford’s petition to discontinue permanent total disability benefits on the grounds that Ford waived the retirement presumption in Minn.Stat. § 176.101, subd. 4. Assuming that an employer may waive its statutory right to presume that an employee would retire at age 67, the employee bears the burden of proving that the employer knowingly and intentionally waived that right. Here, the record lacks any evidence that Ford intended to continue paying PTD benefits to Frandsen after he turned 67. We therefore reverse the
Reversed and remanded.
Notes
. Ford never argued that the retirement presumption is a nonwaivable right; instead,
. We note without comment that the procedure for ending PTD benefits under Minn. Stat. § 176.101, subd. 4, supports the proposition that the retirement presumption takes effect upon inaction by the employer. The WCCA has treated the retirement presumption as a basis for employers to end PTD
In cases in which the presumptive retirement provision of Minn.Stat. § 176.101, subd. 4, applies, an employer or insurer may discontinue payment of permanent total disability benefits to an employee who has been adjudicated or administratively determined to be permanently and totally disabled without filing with this court a petition to discontinue benefits. In such cases, an employer and insurer have no continuing liability for permanent total disability benefits after the employee attains the age of 67 years. If an employee claims entitlement to permanent total disability benefits after attaining the age of 67 years, he or she may file a petition pursuant to Minn.Stat. § 176.291.
70 Minn. Workers’ Comp. Dec. 341, 346 (Minn. WCCA June 29, 2010) (emphasis added); see also Campeau v. Nat’l Purity, Inc., No. WC10-5080,
