HARRIS, Justice.
We granted further review of a court of appeals decision affirming a district court order dissolving the parties’ marriage. We did so in order to critique the division of benefits under a pension plan. Because we also agree with the trial court’s determination, we affirm.
Robert (born in 1939) and Camy (born in 1943) Benson were married in 1962. They adopted two sons, one of whom was killed in a 1987 traffic accident. Welfare of the other son is not involved.
Beginning in 1962 Robert worked as a union truck driver. Camy was employed as a beautician for a number of years until 1978 when she became manager of an apartment complex.
Camy continued her employment in this capacity until 1991, when she left to work in an antique shop. She viewed this career change as preparation for a postretirement enterprise: Robert had an interest in buying and refurbishing antiques and the goal was for the couple to start an antique business upon Robert’s retirement. When it became apparent the marriage was in trouble, Camy quit this job and found a job with another apartment complex. When her old position as apartment manager reopened, she returned to work there.
Although Robert’s employment was sporadic at times, over the course of the marriage his income was higher than Camy’s. At the time of trial Robert had an annual gross income of $35,772 and Camy’s was $21,288. In addition to their annual incomes, each party received other benefits such as health insurance. In particular Robert had almost twenty-five years of credit in a union pension plan. The plan is a noncontributory, defined benefit plan, and was vested at the time of trial. Camy received free rent and utilities at the apartment complex she managed, valued at a minimum of $515 per month.
The district court dissolved the parties’ marriage. The court awarded Camy alimony of $500 per month for five years and, of special interest here, also awarded her a portion of Robert’s pension plan by establishing a formula to divide his future pension benefits. The remaining marital assets were divided equally.
Robert appealed. The court of appeals affirmed on all counts and refused to award Camy attorney’s fees. It is from this decision that Robert sought and was granted further review. Camy again seeks attorney fees for defending the appeal. Our review in this equitable proceeding is de novo. Iowa R.App.P. 4.
I. Robert first claims the district court erred by devising a formula which awards Camy a percentage of the future value of his pension benefits. As we shall explain, courts considering marriage dissolution cases face numerous problems dividing future benefits under pension plans. These problems seem to be increasing both in frequency and difficulty. Some background discussion might be helpful.
A pension plan is “a plan established and maintained by an employer primarily to provide systematically for the payment of [generally ascertainable] benefits to ... employees, or their beneficiaries, over a period of years (usually for life) after retirement.” Black’s Law Dictionary 1135 (6th ed. 1990). The two broad classifications of pension plans are government-administered plans and private plans. Government plans include the railroad retirement system, the federal old age and survivors insurance system, and federal, state, and local government employee retirement systems. Private plans include those established by industry, nonprofit, educational, and charitable organizations, and those created by individuals who have no employment-related coverage. Private plans may be either “qualified” or “nonqualified” under the internal revenue code, with qualified plans receiring special tax advantages. See generally 26 U.S.C. § 401 (1988); The Employment Retirement Income Security Act (ERISA), 29 U.S.C. §§ 1001-1381 (1985).
[254]*254To understand the process by which the accumulation of pension benefits may eventually lead to the disbursement of pension payments, it is important to grasp the meaning of three distinct terms: maturity; vesting; and accrual. The word “matured” simply refers to the point in time when benefits commence. Put another way, “matured” describes the status of pension benefits when “all requirements have been met for immediate collection and enjoyment.” Cearley v. Cearley, 544 S.W.2d 661, 664 n. 4 (Tex.1976) (emphasis added).
The word “vest” is a legal concept referring to “an immediate, fixed right of present or future enjoyment.” Black’s Law Dictionary 1563 (6th ed. 1990). In the context of pensions, a plan is said to be completely “vested” when “an employee (or his or her estate) has rights to all the benefits purchased with the employer’s contributions to the plan even if ... the employment relation terminates before the employee retires.” Id. (emphasis added). Vesting provisions vary considerably from pension plan to pension plan with respect to the types of benefits which will vest (retirement, death, and/or disability), the point in time at which vesting will occur (immediately vs. deferred), the rate at which payments will vest (a full 100% vs. a graded percentage scale), and the form in which benefits will vest (deferred claims, annuity contracts, etc.). See Steven R. Brown, An Interdisciplinary Analysis of the Division of Pension Benefits in Divorce and Post-judgment Partition Actions: Cures for the Inequities in Berry v. Berry, 39 Baylor L.Rev. 1131, 1146 (1987).
Benefit “accrual” refers to the specific dollar amount credited to or accumulated by an individual plan participant at a given point in time. Id. at 1148. Accrual is not a legal concept, but rather a phrase borrowed from actuarial and accounting principles. Utilizing the two previously defined terms, we can see there are three basic periods within which pension benefits “accrue.” At the beginning of employment, after the employee satisfies the pension plan’s conditions for participation, the employee’s pension interests will be nonvested and unmatured. After the employee participates under the plan for a certain length of time and receives an unconditional ownership interest in a portion of the contributions made by his or her employer, the pension benefits are vested but still unmatured. Finally, when the employee obtains the immediate and present right to begin drawing the pension benefits, generally upon retirement, the employee’s interest will be vested and matured. Benefits accrue during each of these three periods in accordance with the plan’s accrual schedule. See id. at 1155-56. The -rate of the benefit accrual depends upon the type of pension plan.
There are two principal types of private pension plans: defined benefit plans and defined contribution plans. These plans are similar in that both may be funded by contributions made either solely by the employer (noncontributory) or by both the employer and the employee (contributory). They are distinct however in that:
Under a defined benefit plan, the future benefit to be received is specified in advance and “defined” by a benefit formula or benefit schedule. The plan contributions are then made as required to fund the specified benefit. Conversely, under a defined contribution plan, the contributions
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HARRIS, Justice.
We granted further review of a court of appeals decision affirming a district court order dissolving the parties’ marriage. We did so in order to critique the division of benefits under a pension plan. Because we also agree with the trial court’s determination, we affirm.
Robert (born in 1939) and Camy (born in 1943) Benson were married in 1962. They adopted two sons, one of whom was killed in a 1987 traffic accident. Welfare of the other son is not involved.
Beginning in 1962 Robert worked as a union truck driver. Camy was employed as a beautician for a number of years until 1978 when she became manager of an apartment complex.
Camy continued her employment in this capacity until 1991, when she left to work in an antique shop. She viewed this career change as preparation for a postretirement enterprise: Robert had an interest in buying and refurbishing antiques and the goal was for the couple to start an antique business upon Robert’s retirement. When it became apparent the marriage was in trouble, Camy quit this job and found a job with another apartment complex. When her old position as apartment manager reopened, she returned to work there.
Although Robert’s employment was sporadic at times, over the course of the marriage his income was higher than Camy’s. At the time of trial Robert had an annual gross income of $35,772 and Camy’s was $21,288. In addition to their annual incomes, each party received other benefits such as health insurance. In particular Robert had almost twenty-five years of credit in a union pension plan. The plan is a noncontributory, defined benefit plan, and was vested at the time of trial. Camy received free rent and utilities at the apartment complex she managed, valued at a minimum of $515 per month.
The district court dissolved the parties’ marriage. The court awarded Camy alimony of $500 per month for five years and, of special interest here, also awarded her a portion of Robert’s pension plan by establishing a formula to divide his future pension benefits. The remaining marital assets were divided equally.
Robert appealed. The court of appeals affirmed on all counts and refused to award Camy attorney’s fees. It is from this decision that Robert sought and was granted further review. Camy again seeks attorney fees for defending the appeal. Our review in this equitable proceeding is de novo. Iowa R.App.P. 4.
I. Robert first claims the district court erred by devising a formula which awards Camy a percentage of the future value of his pension benefits. As we shall explain, courts considering marriage dissolution cases face numerous problems dividing future benefits under pension plans. These problems seem to be increasing both in frequency and difficulty. Some background discussion might be helpful.
A pension plan is “a plan established and maintained by an employer primarily to provide systematically for the payment of [generally ascertainable] benefits to ... employees, or their beneficiaries, over a period of years (usually for life) after retirement.” Black’s Law Dictionary 1135 (6th ed. 1990). The two broad classifications of pension plans are government-administered plans and private plans. Government plans include the railroad retirement system, the federal old age and survivors insurance system, and federal, state, and local government employee retirement systems. Private plans include those established by industry, nonprofit, educational, and charitable organizations, and those created by individuals who have no employment-related coverage. Private plans may be either “qualified” or “nonqualified” under the internal revenue code, with qualified plans receiring special tax advantages. See generally 26 U.S.C. § 401 (1988); The Employment Retirement Income Security Act (ERISA), 29 U.S.C. §§ 1001-1381 (1985).
[254]*254To understand the process by which the accumulation of pension benefits may eventually lead to the disbursement of pension payments, it is important to grasp the meaning of three distinct terms: maturity; vesting; and accrual. The word “matured” simply refers to the point in time when benefits commence. Put another way, “matured” describes the status of pension benefits when “all requirements have been met for immediate collection and enjoyment.” Cearley v. Cearley, 544 S.W.2d 661, 664 n. 4 (Tex.1976) (emphasis added).
The word “vest” is a legal concept referring to “an immediate, fixed right of present or future enjoyment.” Black’s Law Dictionary 1563 (6th ed. 1990). In the context of pensions, a plan is said to be completely “vested” when “an employee (or his or her estate) has rights to all the benefits purchased with the employer’s contributions to the plan even if ... the employment relation terminates before the employee retires.” Id. (emphasis added). Vesting provisions vary considerably from pension plan to pension plan with respect to the types of benefits which will vest (retirement, death, and/or disability), the point in time at which vesting will occur (immediately vs. deferred), the rate at which payments will vest (a full 100% vs. a graded percentage scale), and the form in which benefits will vest (deferred claims, annuity contracts, etc.). See Steven R. Brown, An Interdisciplinary Analysis of the Division of Pension Benefits in Divorce and Post-judgment Partition Actions: Cures for the Inequities in Berry v. Berry, 39 Baylor L.Rev. 1131, 1146 (1987).
Benefit “accrual” refers to the specific dollar amount credited to or accumulated by an individual plan participant at a given point in time. Id. at 1148. Accrual is not a legal concept, but rather a phrase borrowed from actuarial and accounting principles. Utilizing the two previously defined terms, we can see there are three basic periods within which pension benefits “accrue.” At the beginning of employment, after the employee satisfies the pension plan’s conditions for participation, the employee’s pension interests will be nonvested and unmatured. After the employee participates under the plan for a certain length of time and receives an unconditional ownership interest in a portion of the contributions made by his or her employer, the pension benefits are vested but still unmatured. Finally, when the employee obtains the immediate and present right to begin drawing the pension benefits, generally upon retirement, the employee’s interest will be vested and matured. Benefits accrue during each of these three periods in accordance with the plan’s accrual schedule. See id. at 1155-56. The -rate of the benefit accrual depends upon the type of pension plan.
There are two principal types of private pension plans: defined benefit plans and defined contribution plans. These plans are similar in that both may be funded by contributions made either solely by the employer (noncontributory) or by both the employer and the employee (contributory). They are distinct however in that:
Under a defined benefit plan, the future benefit to be received is specified in advance and “defined” by a benefit formula or benefit schedule. The plan contributions are then made as required to fund the specified benefit. Conversely, under a defined contribution plan, the contributions to the fund are specified and “defined,” but there is no predetermined scale of retirement benefits. Instead, the benefit amount received by the retiring employee is determined by the accumulated contributions allocated to that employee at retirement.
Id. at 1137-38. Because Robert’s pension plan is a noncontributory, defined benefit plan, we focus on this type of plan.
As mentioned, in a defined benefit plan the future benefit is specified in advance by a formula. Defined benefit plans commonly utilize one or a combination of the following four basic formulas: (1) a flat amount formula, which provides a flat benefit that is unrelated to the employee’s earnings or length of service; (2) a jflat percentage of earnings formula, which provides a benefit that is related to earnings but unrelated to length of service; (3) a flat amount per year of service formula, which provides a benefit that is related to length -of service but unrelated to earnings; and (4) a percentage of earnings [255]*255;per year of service formula, which provides a benefit that is related to the employee’s earnings and length of service. Id. at 1141-42. Thus, depending upon the formula, the future benefit payable by a defined benefit plan may contain two variables: (1) years of service; and (2) earnings.
We have considered the effect of pensions in dissolution actions on a number of occasions. Under Iowa law pensions are characterized as marital assets, subject to division in dissolution actions just as any other property. In re Marriage of Branstetter, 508 N.W.2d 638, 640 (Iowa 1993). The valuation and division of pension benefits has nevertheless become the subject of considerable litigation in recent years. The problem may arise in a number of different factual situations. See In re Marriage of Mott, 444 N.W.2d 507, 510-11 (Iowa App.1987) (considering situations where the benefits were (1) vested and matured, (2) vested but unma-tured, and (3) unvested and consequently unmatured). We have recognized two general ways for a court to divide and distribute pension benefits.
One method is to determine the present value of the benefits and allocate a share to the pensioner’s spouse (the present-value method). Branstetter, 508 N.W.2d at 642 (citing In re Marriage of Bevers, 326 N.W.2d 896, 900 (Iowa 1982)). Although this method has the advantage of immediate distribution, it also has several disadvantages. Valuation of a pension is complicated (especially when the plan is unvested) and requires the services of an actuary. Mott, 444 N.W.2d at 511. Moreover the financial obligation resulting from a lump sum payment is often beyond a pensioner’s present economic ability to pay. Id.
The second method is to award the spouse a percentage of the pension, payable when benefits become matured (the percentage method). Branstetter, 508 N.W.2d at 642 (citing In re Marriage of Howell, 434 N.W.2d 629, 633 (Iowa 1989)). As the trial court correctly noted, this percentage is based on the number of years the employee accrued benefits under the plan during the parties’ marriage in relation to the total years of benefits accrued at maturity. This method has the advantage of allowing deferred payment, and it properly allocates the risk between the parties (in the event the pension is not vested). Mott, 444 N.W.2d at 511. It has however been noted that care must be taken when setting the formula so that the recipient spouse does not become entitled to any post-dissolution increases in pension benefits. See In re Marriage of Klein, 522 N.W.2d 625, 628 (Iowa App.1994) (discussing the court of appeals’ eases developing this rule). Only the net worth of the parties at the time of the trial is relevant in adjusting their property rights, and our courts have interpreted this rule to mean that any increase in the pension benefits accrued after a dissolution decree cannot be considered marital property. See id.
In the present case the district court opted to utilize the percentage method when dividing Robert’s pension benefits, fashioning the following formula for determining Camy’s share of any payout of matured benefits from Robert’s pension plan. A fraction is first computed, the numerator being the number of years during the marriage Robert accrued benefits under the pension plan (twenty-five) and the denominator being the total number of years Robert’s benefits accrued prior to maturity (i.e., receipt of payments upon retirement). This fraction represents the percentage of Robert’s pension attributable to the parties’ joint marital efforts. This figure is then multiplied by Camy’s share of the marital assets (fifty percent). Finally this second figure is multiplied by Robert’s total accrued monthly benefit upon maturity (retirement) to calculate Camy’s share. The equation may be expressed as follows:
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[256]*256Robert finds fault with this formula, contending it enables Camy to receive a percentage of any post-dissolution increases in pension benefits — increases to which Robert claims he alone is entitled. Robert maintains the court should have awarded Camy only a percentage of the pension plan’s present value at the date of trial. Robert agrees however with the court’s method of requiring payment to Camy only when the benefits are paid out to him.
At first blush there is some appeal in Robert’s contention. A series of appellate cases cited by the parties has developed the proper application of the percentage method. These cases however have not led to consistent results. See Mott, 444 N.W.2d at 511 (granting a fixed percentage of an unvested and unmatured pension, calculated and payable at maturity); In re Marriage of Curfman, 446 N.W.2d 88, 90 (Iowa App.1989) (creating a percentage formula granting an interest in a defined benefit plan which was unvested — contingent upon survival — and un-matured, calculated and payable at maturity); In re Marriage of Oler, 451 N.W.2d 9, 12 (Iowa App.1989) (granting an interest in the wife’s IPERS benefits under the percentage method, calculated and payable at maturity— but granting an interest in the husband’s vested but unmature pension under the percentage method by calculating/locking in the value at the vested rate accrued at the time of dissolution, but not payable until maturity/retirement); In re Marriage of Fuchser, 477 N.W.2d 864, 866 (Iowa App.1991) (granting an interest in a military pension under the percentage method with the amount locked in — calculated at a value fixed at the time of dissolution — but not payable until maturity); In re Marriage of Hornung, 480 N.W.2d 91, 95 (Iowa App.1991) (granting an interest under the percentage method apparently to be calculated and payable at maturity).1 The unresolved question is the time at which we are to set the “value” of the benefit for purposes of calculating the equation: the vested value accrued at the time of dissolution (i.e., the amount the pensioner would be entitled to receive if he or she were to retire immediately and begin drawing benefits) or the value accrued at maturity (i.e., the amount the pensioner actually receives when he or she finally begins to draw benefits— generally at retirement).2
Camy argues she is entitled to receive the increase for three reasons. She first points out that the more years Robert works beyond the dissolution, the smaller the fraction becomes which is used to compute her share of the benefits. This gives Robert an incentive to continue working. Furthermore, as the pension plan is noncontributory, Robert is not required to make any personal contributions. Camy also notes Robert is only able to reach these higher benefits levels [257]*257because of the base of pension benefits accrued with her help during the marriage. In this regard, the district court observed:
[Robert] wishes to freeze [Camy] out of better benefits despite the fact that they have been married for thirty years and for the entire time during which [Robert] has been employed by the [union]. This does not appear to me to be equitable since [Camy] is denied the benefits of the twenty-five years that she put into the marriage and [Robert] gets all the benefits of the base which [Camy] helped secure.
Camy’s argument can be supported on financial grounds. Under the percentage method, Robert receives an advantage because payment of Camy’s share of his pension is deferred until his benefits mature. Because payment is deferred, if we “lock in” the value of Camy’s interest at the time of dissolution, it would prevent her from earning a reasonable return on her interest. See Fuchser, 477 N.W.2d at 868 (opinion concurring in part and dissenting in part) (noting that locking in the value of the pension benefit at the time of initial vesting would inequitably deprive the pensioner’s spouse of cost-of-living increases). To prevent this occurrence it is preferable to set the value of the benefit for purposes of the equation at the time of maturity. The logic of this approach can be seen from an examination of how pension contributions are managed in a defined benefit plan. In such a plan, the employer pools all contributions (the employer’s, and the employee’s if contributory) into one common fund.
During the time from [dissolution] to retirement ... the entire fund — comprised of the employee spouse’s separate property interests and the nonemployee spouse’s separate property interests — continues to establish its earnings profile over time. Since these separate property interests are combined until retirement, the plan administrator can invest [both] the employee spouse’s [and the nonemployee spouse’s] separate property in the fund. This “added” investment value increases the fund’s earning power, which in turn is used (and may be necessary) to create the employee’s future “defined” benefit_ The “defined” benefit received by the employee spouse is made possible ... in part by the use of the nonemployee spouse’s separate property interest in the fund. The entire amount of earnings attributable to the non-employee spouse’s separate property interest remains within the fund, committed to create the “defined” benefit. [If] [t]he nonemployee spouse receives only his [or her] value as calculated and “frozen” on the date of [dissolution], [it] allows the employee spouse to reap the benefits of the earnings attributable to the nonem-ployee spouse’s separate property interest in the fund. The actual earnings attributable to the nonemployee spouse’s separate property interest cannot be awarded to the nonemployee spouse, as a separate value, because they are needed to generate the value of the ultimate “defined” benefit. [I]t seems inequitable for a ... court to “freeze” the value of the nonemployee’s interests in the pension benefits at [dissolution] and prohibit that spouse from realizing any investment income generated from his [or her] separate property interest.
Brown, 39 Baylor L.Rev. at 1188-89.
For purposes of calculation under the percentage method, we think the value of the pension benefit is to be determined at the time of maturity (here, retirement). We therefore hold the trial court was correct in employing this method.
II. Robért also assigns error in the award of alimony to Camy ($500 per month for five years). Even though our review is de novo, we accord the trial court considerable latitude in making this determination and will disturb the ruling only when there has been a failure to do equity. In re Marriage of Wahlert, 400 N.W.2d 557, 560 (Iowa 1987). This deference to the trial court’s determination is decidedly in the public interest. When appellate courts unduly refine these important, but often conjectural, judgment calls, they thereby foster appeals in hosts of cases, at staggering expense to the parties wholly disproportionate to any benefit they might hope to realize.
Especially in view of the trial court’s latitude in such matters, we agree with the [258]*258alimony award. We note the parties have differing earning capacities. We also observe that Camy’s right to enjoy the benefit of Robert’s pension plan must be postponed. We therefore find no merit in Robert’s challenge to the alimony award.
III. Camy requests appellate attorney’s fees. An award of attorney’s fees is not a matter of right but rests within the discretion of the court. In re Marriage of Francis, 442 N.W.2d 59, 67 (Iowa 1989). The court considers the financial positions of the parties and whether the party making the request was obligated to defend the trial court’s decision on appeal. In re Marriage of Williams, 303 N.W.2d 160, 167 (Iowa 1981). Because the terms of the dissolution decree have left the parties in relatively similar financial situations, we order Robert and Camy to each pay their own attorney’s fees for this appeal. Costs on appeal are taxed to Robert.
DECISION OF COURT OF APPEALS AND JUDGMENT OF DISTRICT COURT AFFIRMED.
All justices concur except LAVORATO, LARSON and TERNUS, JJ., who dissent.