Thе central issue on appeal in this marital dissolution is whether and to what extent an interest in stock option and retention stock benefit plans provided by a spouse’s employer constitutes marital property. We conclude that such plans, in the instant case, constitute marital property and that a time rule should be applied to determine to what extent the stock options and retention shares were earned during the marriage. Because the trial court erroneously excluded certain unvested stock options and retention stock, we affirm as modified.
I. BACKGROUND
Richard K. Davidson and Marsha C. Davidson were married on June 5, 1993.
Prior to the mаrriage, Marsha was employed by Security Benefit Group in Topeka, Kansas, where she earned approximately $45,000 per year, plus benefits. At the time of the marriage, Marsha had a bachelor’s degree in English education and a master’s degree in curriculum and education, and had finished the bulk of the classwork for an additional master’s degree and her coursework on a Ph.D. She completed her Ph.D. in adult education during the marriage.
Marsha left her career in Topeka so that she could live in Omaha, Nebraska, with Richard. This was Marsha’s third marriage. She had a 17-year-old child from one of her prior marriages who accompanied her to Omaha to live with Richard.
Marsha did not work outside the home during the marriage. She did, however, expend time and energy in community service. Although Richard testified that Union Pacific did not require his wife to devote time and effort to community activities, he did testify that he felt a personal obligation to give something to the Omaha community and that Marsha had helped him to fulfill that perceived obligation.
Richard’s previous marriage, which lasted 19 years, ended in November 1992. Two children were bom to that marriage, both living with their natural mother during this marriage. At trial, one child was in college, and the other was a senior in high school.
Richard was employed by the Union Pacific throughout his mаrriage to Marsha. Richard’s career in the railroad industry began in 1960 with the Missouri Pacific Railroad, where he was *659 employed as a brakeman. By 1982, when the Missouri Pacific Railroad was purchased by the Union Pacific, Richard was acting as the Union Pacific’s vice president of operations. Two years later, Richard was promoted to executive vice president of operations of the Union Pacific Railroad (Railroad), and in 1991, he became the Railroad’s president. Within a matter of weeks, Richard became the Railroad’s chairman, while retaining his position as president.
Richard’s achievements continued during his marriage to Marshа. In 1994, approximately 1 year into the marriage, Richard was named president of the Union Pacific Corporation (Corporation). The Corporation is the parent company of the Railroad. Where the record is unclear as to this distinction, the term “Union Pacific” will be used. Finally, in 1995, Richard was promoted to chief operating officer of the Corporation. Richard held that position at the time of trial and testified that he expected to become chairman of the Corporation by the end of the year.
Problems arose during the marriage, and by June 1,1995, the parties had separated. Richard filed a petition for dissolution оn June 29, and a trial was held on May 7, 8, and 24,1996. The primary point of contention at trial was the marital estate; specifically, the value of the marital estate and each party’s contribution thereto. Richard’s accountants prepared two financial statements concerning Richard’s assets. The first financial statement was calculated as of May 31, 1993, immediately prior to the marriage. The second statement was calculated as of December 31, 1995, after the parties’ separation but approximately 4 months prior to the trial. Rather than identify and value each asset, the trial court relied on Richard’s financial statements to calculate the value of the marital estate. The trial court determined that the increase in Richard’s net worth between May 31, 1993, and December 31, 1995, was the value of the marital estate.
During the relevant period, Richard’s taxable income was $4,051,854 in 1993; $1,578,435 in 1994; and no taxable income in 1995 because of a loss carryover from a farming operation. A large portion of Richard’s compensation during those years was composed of employee stock options and stock retention shares.
*660 Stock retention shares are stock shares that are unvested when granted but will vest at some predetermined point in time. In the instant case, Richard’s unvested retention shares would vest only if Richard remained employed with Union Pacific until a certain point in time.
An employee stock option is an employee’s contractual right to purchase an employer’s stock during a specified period at a predetermined price. An employee stock option may be vested and matured, vested and unmatured, or unvested. If the employee has an absolute right to exercise the option immediately, the option is vested and matured. If the employee cannot exercise the option until some future date, but the employee has an absolute right to exercise the option on that date, the option is vested and unmatured. If the option cannot be exercised until some future date and the option is subject to divestment, the option is unvested.
Richard had received stock options and stock retention shares from the Corporation since 1983. At the time of trial, Richard had both vested and matured and unvested stock options, and unvested stock retention shares. Robert Knight, a director of compensation and human resource information systems for the Corporation, testified that Union Pacific’s employee stock options program was designed to recognize and reward past performance and to create an incentive for future contribution to the organization. According to the Corporation’s proxy statement, stock retention shares were granted to retain executives, provide incentive for long-term performance, and create shareholder value. Knight testified that Richard’s stock retention shares were indeed designed to retain Richard through a predetermined point in time. The estimated effective income tax rate of the employee stock options was 43 percent, and the rate of the retention shares was 32 percent, assuming they were sold as of December 31, 1995.
The trial court determined that Richard’s unvested stock options and retention shares should not be included in the marital estate because they were too difficult to value. This finding necessitated an adjustment to Richard’s May 31,1993, financial statement because that statement included some unvested options in its calculations. The trial court adopted a procedure *661 called the Black/Sholes valuation method to value the remaining options because that method was used by Richard’s accountants, by Union Pacific, and by Marsha’s expert witness.
After valuing the marital estate at $5,280,010, the court divided that amount, giving two-thirds to Richard and one-third to Marsha. The trial cоurt made this division, stating that Marsha had interrupted her career and provided domestic support during the marriage. This division resulted in a cash award to Marsha of $1,718,643, which was to be paid within 180 days, less certain credits. The trial court also awarded Marsha $5,000 per month in alimony for a period of 6 months, $52,079 in attorney fees, and $9,586 in expert witness fees. In addition, the trial court awarded Marsha $7,500 a month in temporary maintenance during the appeal.
II.ASSIGNMENTS OF ERROR
Restated, Richard’s assignments of error assert that the trial court erred in (1) determining that the marital estate’s value was approximately $5.3 million, (2) awarding Marsha one-third of the marital estate, (3) not providing Richard with certain credits, and (4) awarding Marsha attorney fees and costs.
On cross-appeal, Marsha asserts that the trial court erred in (1) failing to include certain unvested stock options and retention stock in the marital estate, (2) giving Richard a certain credit, and (3) valuing the assets of the marital estate as of December 31, 1995.
III.SCOPE OF REVIEW
In actions for dissolution of marriage, an appellate court reviews the case de novo on the record to determine whether there has been an abuse of discretion by the trial judge. This standard of review applies to the trial court’s determinations regarding division of property, alimony, and attorney fees.
Priest
v. Priest,
IV.ANALYSIS
The parties dispute the trial court’s determination as to the extent, value, and division of the marital estate, as well as certain credits and attorney fees. Appeals in domestic relations matters are heard de novo on the record, and thus, an appellate
*662
court is empowered to enter the order which should have been made as reflected by the record.
Shockley
v.
Shockley,
1. Extent of Marital Estate
We have long held that the marital estate includes property accumulated and acquired during the marriage through the joint efforts of the parties. See, e.g.,
Reichert
v.
Reichert,
This court has not addressed whether unvested employee stock options and stock retention shares accumulated and acquired during the marriage through the joint efforts of the parties constitute marital property. Other jurisdictions have held that employee stock options and stock retention shares are a form of defеrred compensation. See, e.g.,
Klingenberg v. Klingenberg,
2. Joint Efforts of Parties
Richard asserts that the employee stock options and retention shares at issue were obtained as a result of his sole effort and, thus, were not accumulated and acquired through the joint efforts of the parties.
As a general rule, all property accumulated and acquired by either spouse during the marriage is part of the marital estate, unless it falls within an exception to the general rule. See,
Maricle
v.
Maricle,
3. When Accumulated and Acquired
This court has never determined the issue of whether and to what extent stock options and retention shares are accumulated and acquired during the marriage. Other jurisdictions’ approaches are instructive.
In
Smith
v.
Smith, supra,
the court held that unvested employee stock options granted during the marriage should be included within the marital estate. See, also,
Green v. Green, supra.
The court distinguished employee stock options from pensions, stating that “[an employee stock option] has аlready been earned, while a pension is earned over the whole period of the worker’s employment.”
Smith
v.
Smith,
However, most courts recognize that employee stock options may be granted for past, present, or future services, or some combination thereof, depending on the circumstances surrounding the options’ grant. E.g.,
In re Marriage of Hug,
*664 this rule more closely recognizes the purpose of stock options grаnted an employee which are designed so that they vest and become exercisable over a period of time; such options represent both compensation for the employee’s past services and incentives for the employee to continue in his employment in the future.
Were Hall to have included the unvested employee stock options in the marital estate in their entirety, such as in Smith, that portion of the options which represented compensation for services performed prior to the marriage or subsequent to the dissolution would have been erroneously included within the marital estate. However, by excluding thе unvested employee stock options in their entirety, that portion of the options which represented compensation earned for past or future services performed during the marriage was erroneously excluded from the marital estate. See In re Marriage of Hug, supra.
Most courts faced with the issue of when stock options and retention stock are accumulated and acquired look to whether and to what extent the unvested employee stock options at issue were granted for past, present, or future services and then determine what percentage thereof was earned during the marriage and what percentage was еarned prior to the marriage and/or subsequent to its dissolution. See,
DeJesus
v.
DeJesus,
We are persuaded that those jurisdictions applying the time rule are the most consistent with Nebraska law concerning when property is accumulated and acquired for purposes of determining the marital estate. See
Shockley
v.
Shockley,
In the instant case, the trial court did not attempt to determine whether and to what extent Richard’s unvested employee stock options or retention shares were granted for past, present, or future services. Therefore, we conclude that the trial court abused its discretion in excluding the unvested employee stock options in their entirety.
As we have determined that the time rule applies to employee stock options and retention shares in dissolution actions, the question is, In applying the time rule, what stock options and retention shares are included within the marital estate? In applying the time rule, it is incumbent upon the trial court to calculate whether and. to what extent the options were granted as compensation for past, present, or future services. Then the trial court should determine what percentage of each portion thereof was accumulated and acquired during the marriage.
To determine which percentage represents compensation for past, present, and future services, “[n]either the language of the [employee stock option or stock retention share] agreement itself nor the testimony of the employer is dispositive.” Thomas R Malone, Employee Stoсk Options and Restricted Shares: Determining And Dividing the Marital Pot, 25 Colo. Law. 87 at 90 (1996). Relevant, nonexhaustive considerations include whether the employee stock options or stock retention shares were intended to (1) secure optimal tax treatment, (2) induce the employee to accept employment, (3) induce the employee to remain with the employer, (4) induce the employee to leave his or her employment, (5) reward the employee for completing a specific project or attaining a particular goal, and (6) be granted on a regular or irregular basis. These, as well as any other relevant cоnsiderations, should be applied by the trial court according to the unique circumstances presented.
Based on Union Pacific’s proxy statement and the testimony of Knight, we conclude in the instant case that Richard’s stock options were granted to compensate Richard equally for both past and future services and that his retention shares were granted entirely for future services.
*666 4. Determining Percentage Earned During Marriage
Once the trial court has determined whether and to what extent the unvested employee stock options or stock retention shares were granted for past, present, or future services, the trial court should determine what percentage of eаch portion was accumulated and acquired during the marriage. The following formulas or variations thereof should be used by the trial court to make that determination.
If an option or retention share is granted prior to the marriage, that portion of the option or retention share which represents compensation for past services was accumulated and acquired entirely outside the marriage. If, however, an option or retention share is granted during the marriage, the trial court must determine the percentage of compensation for past services accumulated and acquired during the marriage, if any, by creating a fraction. The numerator is the period of time from the beginning of the marriage until the date of the grant, and the denominator is the period of time from the beginning of the employee-spouse’s employment until the date of the grant. See
DeJesus
v. DeJesus,
Married TDatel to Grant TDate/# Davsl = % Past
Employed [Date] to Grant [Date/# Days] Service
It should be noted that if the employee-spouse’s employment began after the parties were married, that portion of the option or retention share which represents compensation for past services was accumulated and acquired entirely within the marriage.
To determine the percentage of compensation for future services, if any, when the option or retention share is granted prior to the marriage but vests during the marriage, the trial court should create a fraction. The numerator is the period of time from the beginning of the marriage until the stock option or retention share vests, and the denominator is the period of time from the date of the grant until the employee stock option or retention share vests. Diagrammed, the fraction looks like this:
Married TDatel to Vested TDate/# Davsl = % Future
Granted [Date] to Vested [Date/# Days] Services
*667 If the option or retention share is granted during the marriage and vests during the marriage, that portion of the option or retention share which represents compensation for future services, if any, was accumulated and acquired entirely during the marriage. If, hоwever, the option or retention share is granted during the marriage and will vest sometime after dissolution, the percentage of future services, if any, is determined by a fraction. The numerator is the period of time from the date of the grant until dissolution, and the denominator is the period of time from the date of the grant until the employee stock option vests. DeJesus v. DeJesus, supra. Diagrammed, the fraction looks like this:
Granted iDatel to Dissolved TDate/# Davsl = % Future
Granted [Date] to Vested [Date/# Days] Services
Finally, any option/retention share or portion thereof which is granted during the marriage and determined to be compensation for present services is accumulated and acquired in its entirety when granted.
In re Marriage of Short,
Pursuant to our de novo review, we now apply the above fractions to the stock options and retention shares. We emphasize that although the trial courts should apply some fraction to determine to what extent the employee stock options or stock retention shares were earned during the marriage, the trial courts are not limited to any specific application of the time rule.
In re Marriage of Hug,
In the instant case, we conclude that there is no need to adjust the typical fractions applicable to future compensation; however, adjustments should be made to the fractions concerning pаst compensation. The period during which Richard’s past services were performed must be limited to the time elapsed from the last date upon which an option was granted to Richard until the date upon which the option at issue was granted. Had the Corporation intended to compensate Richard for services rendered prior to the date upon which the previous option was granted, Union Pacific would have simply awarded more *668 employee stock options to Richard at that time. In our adjusted past services fraction, the numerator is the period of time from the date the last employee stock options were granted or the beginning of the marriage, whichever is later, until the date of the grant. The denominator is the period of time from the date the last employee stock options were granted, until the date of the grant. Diagrammed, the fraction looks like this:
Last
Granted/
Married fDatel to Granted TDate/# Davsl = % Past
Last [Date] to Granted [Date/# Days] Service
Granted/
Employed
The percentage of each block of stock options and stock retention shares granted for past services and the percentage granted for future services are set forth in the appendix to this opinion.
5. Value of Marital Estate
Marsha argues that the trial court erred in valuing the marital estate as of December 31, 1995, rather than as of the time of trial. In
Else
v. Else,
(a) Valuing Unvested Stock Options and Retention Shares Earned During Marriage
We recognize that other jurisdictions have employed a variety of methods to value employee stock options and retention shares. In
Green
v.
Green,
In the instant case, the trial court valued the employee stock options using the Black/Sholes method, whiсh is a mathematical formula used to value stock options. This method takes into account the option price, the term of the option, the market value of the underlying security, a risk-free rate of return, and the underlying volatility of the stock option, in order to come up with a present value for the options at issue. Richard asserts that the trial court erred by applying the Black/Sholes option pricing method rather than the intrinsic value method. We note, however, that Richard’s own accountants used the Black/Sholes option pricing method to value Richard’s employee stock options on his financial statements. Likewise, thе Corporation used the Black/Sholes option pricing method to value Richard’s shares in its 1996 proxy statement. Therefore, we conclude that the trial court did not abuse its discretion in this instance by using the Black/Sholes option pricing method to value Richard’s employee stock options.
(b) Black/Sholes Valuation Method
The next step in our de novo review is to determine the value of the unvested options and retention shares that constitute mar *670 ital property. To do so, we multiply the difference between the options’ exercise price and present value by the number of shares at issue, and then multiply the product thereof by the sum of the past percentаge and the future percentage divided by 2. The product thereof represents the pretax value of the stock options to the marital estate, which should be adjusted to reflect the posttax value. Diagrammed, the equation looks like this:
(Black/Sholes - Option Price x # shares) (Past % + Future % /2) x (100% - Effective Tax Rate %) = Estate Value .
We use a similar equation for the stock retention shares, simply omitting the option price and past percentage.
The valuation calculations are set forth in the appendix to this opinion. Those calculations indicate that the total value of Richard’s employee stock options and stoсk retention shares attributable to the marital estate is $5,655,974. According to the method of calculation used by the trial court, and a comparison of the financial statements prepared by Richard’s accountants, the remaining portion of the marital estate is $2,230,145. Added together, we conclude that the value of the marital estate is $7,886,119.
6. Division of Marital Estate
In dividing property and determining alimony, a court should consider four factors: (1) the circumstances of the parties; (2) the duration of the marriage; (3) the history of contributions to the marriage, including contributions to the care and education of the children and interruption of personal careers or eduсational opportunities; and (4) the ability of the supported party to engage in gainful employment without interfering with the interests of any minor children in the custody of each party,
Reichert
v.
Reichert,
In the instant case, Marsha and Richard separated after 2 years and were married for only 38 months. Richard’s 33-year career in the railroad industry had reached its zenith at the time the parties were married. Richard was already president of the Railroad and had received stock option grants every year since 1983. It is true that Richard was promoted to chаirman of the *671 Railroad and then to president of the Corporation during the marriage and that he was awarded significant grants of stock options and retention shares. However, the record reflects that Richard had steadily climbed the corporate ladder and was well positioned to attain these promotions before he married Marsha. Most importantly, the bulk of the marital estate consists of stock options and retention shares that were earned as a result of those promotions.
We are aware that Marsha assisted Richard with his employee-related responsibilities by providing social support and that she tutored Richard’s college-age son. Furthermore, although Marsha completed her Ph.D. during the marriage, she interrupted a successful career to marry Richard. These contributions to the marriage are relevant and must be taken into consideration. See
Chrisp
v.
Chrisp,
Considering that no children were bom to the parties, that the parties separated after 2 years, that the marriage lasted 38 months, that Richard’s career was well established, and that Marsha is highly educated and capable of finding employment, we conclude that the trial court’s adherence to the general guidelines was an abuse of discretion.
We determine Marsha is entitled to $950,000, less a credit of $145,789, which is the value of the Lexus and Mustang automobiles ($41,013), the jewelry ($49,515), the personal property retained by Marsha ($15,261), the payment to prepare the premarital home for sale ($15,000), and the $25,000 cash payment that was to be made immediately upon entry of the trial court’s decree. That amount shall be paid in cash within 45 days of the release of this opinion.
7. Credits
Richard argues that the trial court erred in not ordering the $7,500 monthly payment Richard must make to Marsha during the pendency of this аppeal be credited against Marsha’s share of the marital estate. Although the trial court did not expressly state that the $7,500 payments be credited against Richard’s total liability, we assume that the trial court intended its order to *672 be in conformity with the law. The law is clear in this state that alimony payments paid during the pendency of an appeal must be credited toward the payor’s other alimony and property division payments. See Isenberger v. Isenberger, 239 Neb. 706, 477 N.W.2d 927 (1991). Thus, we conclude that the $7,500 payments shall be credited toward Richard’s obligations in addition to those credits already awarded.
On cross-appeal, Marsha asserts that the trial court erred in giving Richard a crеdit for voluntary payments he made to Marsha during the pendency of the proceedings below. The record reflects that a substantial number of these payments were made to maintain the family home, which was ultimately awarded to Richard. Richard should not receive a credit for maintaining his own assets. We conclude that the trial court abused its discretion in giving a credit for Richard’s voluntary payments as reflected in exhibit 61.
8. Attorney Fees
The award of attorney fees in a dissolution action involves consideration of such factors as the nature of the case, the amount involved in the controversy, the services performed, the results obtained, the length of time required for preparation of the case, the skill devoted to preparation and presentation of the case, the novelty and difficulty of the questions raised, and the customary charges of the bar for similar services.
Priest
v.
Priest,
V. CONCLUSION
We are aware that the portion of the marital estate awarded to Marsha is less than the one-third to one-half guideline of the general rule. However, under the unique circumstances of the instant case, we are satisfied that Marsha’s award is fair and reasonable. Richard shall pay Marsha $950,000, less those credits awarded in this opinion, within 45 days of this opinion’s release. In all other respects, the trial court’s decree is affirmed.
Affirmed as modified.
*673 APPENDIX
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*674 [[Image here]]
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*675 [[Image here]]
STOCK RETENTION SHARES
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*676 [[Image here]]
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*677 [[Image here]]
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1. The percentage that represents compensation for past services was accumulated and acquired entirely outside the marriage because the options were granted prior to the marriage.
2. The percentage that represents compensation for future services was accumulated and acquired entirely within the marriage because the options were granted and vested during the marriage.
3. The percentage that represents compensation for past services was accumulated and acquired entirely within the marriage because the prior options were granted during the marriage and the options at issue vested during the marriage.
