OPINION

NARES, J.

In a dissolution, husband (David) claimed community interest in a corporation formed during the marriage, Gas Turbine Services Corporation (GTS), whose stock had been issued to wife (Barbara). In bifurcated proceedings the court found: (1) Barbara was the title holder to the GTS stock; (2) judicial estoppel did not bar David from asserting community interest in GTS; (3) the increased value of GTS was due to David's effort, expertise and contacts; (4) under the doctrine of equitable apportionment and Pereira v. Pereira (1909) 156 Cal. 1 [ 103 P. 488], Barbara's separate property investment in GTS was due a 10 percent annual return, and the balance of GTS profits was community property.

Barbara appeals, asserting (1) error in finding that judicial estoppel did not bar David's claim; and (2) error in applying the doctrine of equitable apportionment. We conclude substantial evidence supports the court's findings. Accordingly, we affirm.

FACTS AND PROCEDURE

Barbara and David lived together from December 1981. David worked in the aerospace field. Barbara was unemployed, but she had some $75,000 in separate property. Barbara and David were married August 29, 1982.

David lost his San Diego job in September 1982. He commuted to a new job in Dallas, Texas for several months before quitting to join his experience with Barbara's capital, and go into business with Barbara.

In March 1983, they retained corporate counsel (Dwyer) who formed GTS, naming Barbara and David as the original incorporators. Until their separation, Barbara and David were the only members of the GTS board. David was named president of GTS and agent for service of process. Barbara helped with typing, scheduling and bookkeeping.

The GTS stock was issued solely in Barbara's name. According to David, Barbara wanted the stock in her name "[t]o protect the assets of the company from [his ex-wife]." Attorney Dwyer told both Barbara and David that the stock could later be transferred into both their names. Dwyer testified at his deposition that Barbara and David referred to GTS as "our corporation" and said "we're going to build it together." The GTS accountant asked the parties why the stock was solely in Barbara's name. The accountant was told that Barbara and David were having "trouble" with David's former wife.

Barbara initially capitalized GTS with $1,000 from her separate property. In addition, she loaned GTS nearly $50,000 for start-up costs. In 1985 David received some $20,000 in settlement of a lawsuit. He loaned these funds to GTS to cover payroll. Barbara and David's loans were accounted for separately. GTS repaid Barbara, but David testified his loans were never repaid.

GTS obtained further commercial loans to purchase equipment and machinery and to provide working capital. The loans were personally guaranteed by Barbara and David.

David's ex-wife discovered GTS in October 1983, and filed a motion to increase her spousal support. In opposition to the motion, David filed a declaration in propria persona denying (under penalty of perjury) any ownership interest in GTS. This motion forms the basis for Barbara's contention that David should be judicially estopped from claiming community interest in GTS. At trial there was extensive testimony regarding Barbara's involvement in the preparation of David's declaration.

GTS became quite profitable. After six years of marriage David filed for dissolution, claiming GTS as a community asset. Barbara called a meeting of GTS's board of directors, and fired David. The court placed GTS in receivership. At the request of the receiver, David was reinstated as chief executive, and Barbara was enjoined from entry upon GTS premises.

In the first trial Barbara argued (1) GTS was her separate property, as its stock was issued in her name alone; and (2) David should be judicially estopped from claiming any interest in GTS. The commissioner found, under Evidence Code section 662, Barbara was the sole owner of the stock. The commissioner also ruled David's community property claim was not barred by judicial estoppel due to the coordinated "interactions of the parties as it pertains to the prior disso[lution] case."

In the second trial Barbara argued (1) judicial estoppel should bar David's claim, notwithstanding her pending appeal of the first judgment; (2) the doctrine of equitable apportionment should not be applied, because David had increased the value of her separate property (GTS), not his; and (3) David had been adequately compensated for his services, and thus apportionment was not required.

Following a lengthy trial, the judge rejected Barbara's arguments and applied the apportionment formula of Pereira v. Pereira, supra, 156 Cal. 1. Based on expert testimony, the court valued GTS at $927,000. The court apportioned Barbara's original $1,000 plus a 10 percent annual return, totaling $1,934, to her separate property. The balance of $925,066 was apportioned to community property. The court also made specific findings that David had been paid market value for his services, and that David was the reason for the great success of GTS. Barbara appealed from the second judgment, raising identical contentions.

DISCUSSION

(1) Barbara argues this is not an apportionment case, and she asserts the question whether to apply equitable apportionment is one of law which should be reviewed de novo. Barbara cites no valid authority for this proposition.

Appellate review of a trial court's finding that a particular item is separate or community property is limited to a determination of whether any substantial evidence supports the finding. ( Marriage of Ananeh-Firempong (1990) 219 Cal.App.3d 272, 279 [ 268 Cal.Rptr. 83]; McLellan v. McLellan (1972) 23 Cal.App.3d 343, 356 [ 100 Cal.Rptr. 258].) We apply the substantial evidence test to the judicial estoppel issue and to the issue whether equitable apportionment should be applied to this case. We apply the abuse of discretion test to the court's application of Pereira. ( Beam v. Bank of America (1971) 6 Cal.3d 12, 18 [ 98 Cal.Rptr. 137, 490 P.2d 257].)

I. JUDICIAL ESTOPPEL

(2) Barbara argued, because of David's declaration in opposition to his ex-wife's motion for increased spousal support, that he should be judicially estopped from claiming an interest in GTS. Judicial estoppel is an equitable doctrine aimed at preventing fraud on the courts. It is applied to keep litigants from playing "fast and loose with the court." ( Schulze v. Schulze (1953) 121 Cal.App.2d 75, 83 [ 262 P.2d 646].)

David testified before the commissioner that Barbara drafted the declaration and presented it for his signature. At her deposition, Barbara denied any involvement in preparing the declaration. However, at trial, David produced a handwritten declaration prepared by Barbara. She then admitted to assisting David with his declaration and taking an active role in defeating his ex-wife's motion.

The commissioner found "judicial estoppel clearly does not apply in this particular case" because of the "interactions of the parties" in opposition to the spousal support motion filed by David's ex-wife.

A trial court's determination on the issue of estoppel is a factual finding which will be upheld if supported by substantial evidence. ( County of Sonoma v. Rex (1991) 231 Cal.App.3d 1289, 1296 [ 282 Cal.Rptr. 796].)

The purpose of judicial estoppel is to prevent injury to an innocent litigant. Barbara admits in her brief, that she "did help draft the earlier declaration." We conclude the commissioner's finding is supported by substantial evidence.

II. EQUITABLE APPORTIONMENT

(3a) Barbara contends that since the community had received market value compensation for David's services to GTS, the trial court should not have reached the issue of apportionment. Barbara's assertion begs the question of what triggers a court's application of the doctrine of equitable apportionment.

We begin by noting that in California, property acquired prior to marriage is separate, while property acquired during the marriage is presumed community property. (Civ. Code, §§ 5107, 5108, 5110.) Income from separate property is separate, the intrinsic increase of separate property is separate, but the fruits of the community's expenditures of time, talent, and labor are community property. (Civ. Code, §§ 5107, 5108; Perkins, Appreciation of the Separately Owned, Closely Held Business (1987) 14 Comm.Prop.J. 62, 64.)

(4) Indeed, the basic concept of community property is that marriage is a partnership where spouses devote their particular talents, energies, and resources to their common good. (Knutson, California Community Property Laws: A Plea for Legislative Study and Reform) (1966) 39 So.Cal.L.Rev. 240.) Acquisitions and gains which are directly or indirectly attributable to community expenditures of labor and resources are shared equally by the community. ( Ibid.)

Where community efforts increase the value of a separate property business, it becomes necessary to quantify the contributions of the separate capital and community effort to the increase. (Perkins, Appreciation of the Separately Owned, Closely Held Business, supra, 14 Comm.Prop.J. at p. 64.) It is well settled in California that income produced by an asset takes on the character of the asset from which it flows. Thus, rents, issues and profits are community property if derived from community assets, and separate property if derived from separate assets. (Civ. Code, §§ 5107, 5108; Hicks v. Hicks (1962) 211 Cal.App.2d 144, 152-153 [ 27 Cal.Rptr. 307], citing Estate of Cudworth (1901) 133 Cal. 462, 468 [ 65 P. 1041].)

In Pereira v. Pereira, supra, 156 Cal. at page 7, the California Supreme Court first announced the rule that where a husband owns a separate property business and devotes his efforts to the enterprise, there must be an apportionment of the profits. (See also Beam v. Bank of America, supra, 6 Cal.3d at p. 17; Estate of Neilson (1962) 57 Cal.2d 733, 740 [ 22 Cal.Rptr. 1, 371 P.2d 745]; Gilmore v. Gilmore (1955) 45 Cal.2d 142, 149 [ 287 P.2d 769]; Harrold v. Harrold (1954) 43 Cal.2d 77, 80 [ 271 P.2d 489]; Huber v. Huber (1946) 27 Cal.2d 784, 792 [ 167 P.2d 708].)

Viewing the language cited in Pereira in light of California's partnership model of marriage, the necessity of apportionment arises when, during marriage, more than minimal community effort is devoted to a separate property business. (See Weinberg v. Weinberg (1967) 67 Cal.2d 557 [ 63 Cal.Rptr. 13, 432 P.2d 709] [community entitled to share of profits even where owning spouse devotes "minimal" effort]; Kenney v. Kenney (1954) 128 Cal.App.2d 128 [ 274 P.2d 951] [community entitled to share of profits for "comparatively insignificant" services].)

The community is entitled to the increase in profits attributable to community endeavor. ( Beam v. Bank of America, supra, 6 Cal.3d at p. 17; Pereira v. Pereira, supra, 156 Cal. at p. 7.) Accordingly, courts must apportion profits derived from community effort to the community, and profits derived from separate capital are apportioned to separate property. ( Beam v Bank of America, supra, 6 Cal.3d at p. 18; Estate of Neilson, supra, 57 Cal.2d at p. 740; Pereira v. Pereira, supra, 156 Cal. at p. 7.)

(3b) Barbara's point, that the community received market value compensation, does not affect our inquiry. Whether or not the community received salary, a court must determine to what extent the increased value of the separate property business is attributable to community effort. (See Weinberg v. Weinberg, supra, 67 Cal.2d at p. 565.)

Barbara further argues that equitable apportionment does not apply here because David was increasing the value of her property, not his. This misreads Pereira and its progeny.

A fair reading of Pereira supports the view that where more than minimal community effort combines with a separate capital investment to increase the value of the separate investment, the court must determine the amount of the increase attributable to the capital, and the amount attributable to community effort. ( Pereira v. Pereira, supra, 156 Cal. at p. 7.)

Here, GTS was started during the marriage. Barbara was issued all GTS stock, valued at $1,000. The commissioner found the stock was Barbara's separate property. She and David were the only officers of the corporation. David devoted 100 percent of his effort to building GTS and was primarily responsible for its success. We hold that the trial court's application of equitable apportionment to the increased value of the GTS stock is supported by substantial evidence.

III. PEREIRA

Once the court is satisfied that it should apportion business profits, the question arises which method to apply. (5) California courts have developed two alternative approaches to allocating business profits. The Pereira approach is to allocate a fair return to the separate property investment and allocate the balance of the increased value to community property as arising from community efforts. ( Beam v. Bank of America, supra, 6 Cal. 3d at p. 18; Estate of Neilson, supra, 57 Cal.2d at p. 740; Pereira v. Pereira, supra, 156 Cal. at p. 7.) The Van Camp approach is to determine the reasonable value of the community's services, allocate that amount to community property and the balance to separate property. ( Beam v. Bank of America, supra, 6 Cal.3d at p. 18; Tassi v. Tassi (1958) 160 Cal.App.2d 680, 690 [ 325 P.2d 872]; Van Camp v. Van Camp, supra, 53 Cal.App. at pp. 27-28.)

Beam observed that courts have not developed a precise standard in choosing between Pereira or Van Camp, but have endeavored to adopt that formula which is most appropriate and equitable under the circumstances. ( Beam v. Bank of America, supra, 6 Cal.3d at p. 18.) The court is not bound to adopt a predetermined percentage as a fair return on separate business capital, nor need it limit the community interest to a salary as reward for a spouse's efforts, but may select whichever formula will effect substantial justice between the parties. ( Ibid.)

Pereira is typically applied where business profits are principally attributed to efforts of the community. (See, e.g., Estate of Neilson, supra, 57 Cal.2d at p. 740; Pereira v. Pereira, supra, 156 Cal. at p. 7.) Conversely, Van Camp is applied where community effort is more than minimally involved in a separate business, yet the business profits accrued are attributed to the character of the separate asset. (See e.g., Tassi v. Tassi, supra, 160 Cal.App.2d at p. 690; Logan v. Forster (1952) 114 Cal.App.2d 587, 601 [ 250 P.2d 730]; Van Camp v. Van Camp, supra, 53 Cal.App. at pp. 27-28.) The court has discretion to choose whichever formula will effect substantial justice.

(6) Here, Barbara argues the community has been compensated for its efforts. She relies on the trial court's finding that the community received fair market compensation, and would end apportionment there. However, she ignores the trial court's dispositive finding that David was primarily responsible for the increased value of GTS.

To elaborate on the Pereira apportionment formula, the court's focus is on the increased value of the business. Here, the trial court found the GTS stock, initially valued at $1,000, was issued in Barbara's name. The court then determined the value of the stock at the time of trial was $927,000. Under Pereira, the totality of the stock's (and, therefore, the business's) increase in value (here $926,000) is attributed to either the separate capital investment or to the efforts of the community. (See, e.g., Estate of Neilson, supra, 57 Cal.2d at p. 740; Pereira v. Pereira, supra, 156 Cal. at p. 7; In re Marriage of Denney (1981) 115 Cal.App.3d 543, 549 [ 171 Cal.Rptr. 440].) That part of the increase derived from the capital is apportioned to separate property. That part which derives from the community effort is apportioned to the community. ( Ibid.)

As noted, the Pereira formula attributes to separate property the amount invested plus a fair return. The balance is attributed to the community. (See e.g., Estate of Neilson, supra, 57 Cal. 2d at p. 740; Pereira v. Pereira, supra, 156 Cal. at p. 7; In re Marriage of Denney, supra, 115 Cal.App.3d at p. 549.) Here, the trial court accorded Barbara her original $1,000, plus a 10 percent annual return, for a total of $1,934 in separate property. That figure was then subtracted from the increased value of GTS ($927,000), leaving a balance of $925,066 which was apportioned to the community.

To limit the community to compensation received by way of salary during the marriage would ignore California's egalitarian marriage model and the apportionment formula of Pereira, and thereby leave over $925,000 unattributed. Implicit in the trial court's finding that David was responsible for the increase is a finding the capital investment would not have returned its 927 percent increase without his efforts. The increase, therefore, was "due to the personal character, energy, ability and capacity of [David]. [That] share of the earnings [is], of course, community property." ( Pereira v. Pereira, supra, 156 Cal. at p. 7.)

The trial court found GTS had started with nothing. David had the contacts and expertise, and devoted 100 percent of his time, skill and efforts to the success of GTS. David had a capably chosen and capably trained team of employees. The court further determined Barbara was unable to effectively operate GTS, either personally or by her proposals regarding management.

Given the clear mandate of Beam v. Bank of America, supra, 6 Cal.3d at page 18, to achieve substantial justice between the parties, on the facts of this case, we conclude the trial court did not abuse its discretion in applying Pereira.

The heart of Barbara's argument is that since David was "generously paid for his services during marriage," the trial court's application of Pereira gave him a "double dip." On the contrary, were we to heed her urging and reverse the trial court's judgment, Barbara would receive the "double dip." David's "generous salary" was (and is) community property, and Barbara thereby also enjoyed the benefit of David's salary. That salary, however, does not fairly reflect community efforts. David took Barbara's $1,000 and parlayed it into a million-dollar business. The trial court recognized David's contribution and properly applied Pereira. That judgment will not be disturbed on this appeal.

DISPOSITION

The judgment is affirmed.

Benke, Acting P.J., and Huffman, J., concurred.

A petition for a rehearing was denied August 31, 1993, and appellant's petition for review by the Supreme Court was denied December 1, 1993.