HENDERSON, Justice.
CASE SUMMARY
We affirm the trial court’s decision on a contract for deed foreclosure, with the exception of a double counting of improvements made by the Buyers which wrongly skews the balancing of equities. Thus, we affirm in part and reverse and remand in part.
PROCEDURAL HISTORY/ISSUES
Plaintiffs/appellants Reuben 0. Beitel-spacher and Ruth Beitelspacher (Sellers) initiated an action to foreclose on a 1977 contract for deed in the circuit court for Brown County after defendants/appellees Elden L. Winther and Antoinette Winther (Buyers) failed to make a final $123,585 balloon payment. After a non-jury trial, judgment was entered foreclosing Buyers’ rights under the contract for deed, subject to Sellers’ payment of $35,126.84 to Elden Winther. This sum represented an adjustment of the equities between the parties under SDCL 21-50-2 and per this Court’s unanimous decision in Dow v. Noble, 380 N.W.2d 359 (S.D.1986).
Sellers contend, in their Notice of Appeal No. 16388, that the trial court erred in four regards:
1. The equitable adjustment formula of Dow v. Noble is inconsistent with SDCL Ch. 21-50;
2. Dow v. Noble should not be given retrospective application; .
3. If the Dow v. Noble formula applies, the trial court did not properly implement it (Sellers created six separate sub-issues on this point which are treated below); and,
4. A default judgment initially entered against Antoinette Winther should not have been set aside under SDCL 15-6-60(b) (this is essentially a red herring, but, having been raised, it is treated below).
Buyers assert, by Notice of Review, No. 16389, that the trial court erred in four aspects concerning adjustment of the equities between these parties:
1. A WEB easement penalty was improperly assessed as a detriment to the property;
2. Excessive attorney’s fees were awarded to Sellers, as the trial court failed to determine what portion of Seller’s claimed fees were reasonable;
3. Interest on the value of the payments made to Sellers should have been considered in balancing the equities; and,
4. Increases in “ASCS crop bases” should have been included in the equitable balancing process as they were a benefit to the property.
FACTS
On September 30, 1977, Sellers and Buyers signed a contract for deed on Sellers’ farm, which comprised 433 acres of pasture, 177 acres of cropland, and a 16-acre building site. The contract called for, inter alia, a total purchase price of $294,400, with $8,000 to be paid up front, and $77,376 due by October 16, 1977. These payments were made by Buyers. The remaining unpaid principal balance ($209,024) plus interest was to be paid in annual installments of $10,451.20 plus interest. A final balloon payment of $123,585.44 was due on November 1,1987. The Buyers did not make their balloon payment, as Elden Winther, one of the Buyers, tried to secure financing, but failed.
The Buyers, who were married to each other at the time they entered the contract for deed, became embroiled in a divorce action. In 1987, Antoinette Winther sought a divorce in the Circuit Court for Brown County, and was granted a judgment and decree of divorce dated February 2, 1988. Interestingly, the Buyers’ trial in the divorce action was held on October 27, 1987, only five days before the final balloon [350]*350payment on the contract for deed was due. The divorce decree directed Antoinette to deed her interest in the real property, subject to the contract for deed, to Elden, who was to assume all indebtedness related to such property.
Meanwhile, on January 5, 1988, as Buyers had missed their balloon payment, the Sellers initiated this foreclosure action. Although Antoinette had signed the contract for deed, she was directed by the divorce decree to transfer her interest, via quit claim deed, to Elden. She was not served with a certificate of readiness for trial, which “must be served” under SDCL 15-6-40(b), although the statute also provides that “[a]ny or all of the requirements of this rule may be dispensed with in any given case by the judge assigned to it.” Antoinette did not appear at the trial, and a default judgment was entered against her. Six days after she was served with notice of the default judgment, Antoinette filed a motion, with supporting affidavit, for relief from judgment under SDCL lS-e-GOlb).1 Her motion was granted by the trial court.
At the trial itself, evidence regarding the fair rental value of the property was contradictory. Although the Sellers, by their notice of appeal, allege that the trial court erred in finding that a fair rental value of the property was $20 per acre, Reuben Beitelspacher testified that such value, for cropland and pasture, was in a $20-$25 range.
The trial court determined that the total benefit to the Sellers was $308,764.16 and Seller's total detriment was $273,637.32. The trial court made an equitable adjustment for the difference in these figures, $35,126.84, which Sellers were to pay to Buyers.
Mathematically, the trial court’s equitable adjustment breaks down as follows:
Sellers’ Detriment
1. Rent: $ 99,162.11
2. Easement Payment to Buyers: $ 300.00
3. Loss of Land Value: $147,044.00
Sellers' Detriment
4. Expense of Original Sale: $ 5,838.00
5. Miscellaneous Expenses in Land Recovery: $ 21,293.21
TOTAL DETRIMENT: $273,637.32
Sellers’ Benefits
1. Principal Paid: $179,336.80
2. Interest Paid: $114,179.36
3. Improvements Made by Buyers: $ 15,248.00
TOTAL BENEFIT:
$308,764.16
Thus, the trial court’s finding under the equity adjustment formula of Dow v. Noble was reached by subtracting $273,637.32 from $308,764.16, yielding $35,126.84.
DECISION
A. Seller’s Notice of Appeal (No. 16388)
I. Applying Dow v. Noble and SDCL Ch. 21-50 to the facts.
Sellers first argue that rules of statutory construction render Dow v. Noble, 380 N.W.2d 359 (S.D.1986) inconsistent with provisions of SDCL Ch. 21-50. Two particular statutes, SDCL 21-50-2, 21-50-3 are relied upon in Sellers’ argument. SDCL 21-50-2 provides, in pertinent part: “The court in such actions shall have the power to equitably adjust the rights of all the parties thereto ...” while SDCL 21-50-3 provides:
Upon the trial of an action under this chapter the court shall have power to and by its judgment shall fix the time within which the party of parties in default must comply with the terms of such contract on his or their part, which time shall be not less than ten days from the rendition of such judgment, and unless the parties against whom such judgment is rendered shall fully comply therewith within the time specified, such judgment shall be and become final without further [351]*351order of the court, and all rights asserted under the contract shall thereupon be forever barred and foreclosed.
Sellers argue that SDCL 21-50-2 is a general statute, whereas SDCL 21-50-3 is a specific statute which limits the court’s authority under SDCL 21-50-2 to fixing the time in which a defaulting party may comply with the terms of the contract. We disagree. SDCL 21-50-2 refers to “rights” which may be adjusted. SDCL 21-50-3 has a narrower reach because it deals with, particularly, only one aspect of the parties’ rights — the time to cure default. The law must be so construed as to give effect to all of its provisions, if possible. State v. Heisinger, 252 N.W.2d 899 (S.D.1977); State ex rel. Kriebs v. Halladay, 52 S.D. 497, 501, 219 N.W. 125, 127 (S.D.1928). Sellers’ interpretation would reduce SDCL 21-50-2 to a nullity.
Sellers’ constricted interpretation of SDCL 21-50-2 is unsound, as reflected in Severson v. Eide, 52 S.D. 20, 25, 216 N.W. 581, 583 (1927), where this Court, interpreting R.C.1919, § 2915,2 the predecessor of SDCL 21-50-2, wrote:
If the situation were reversed and the rents amounted to more than the interest and taxes, we think there can be no doubt that defendants could be relieved from an apparent default by an application of the rents in payment of such interest and taxes, or as the situation is if defendants desired to hold their contract that they could reduce the amount to be paid in redemption by compelling plaintiff to account for and apply such rents to a reduction of the amount due. We can see no reason why plaintiff may not have the same right of set-off in his favor.
It is apparent that, even in 1927, the trial court’s authority to adjust equities under § 2915 extended beyond the narrow confines projected by Sellers. R.C.1919 § 2914, the predecessor of SDCL 21-50-3, was not perceived by the Severson court as the outer limit of equitable adjustment.
This Court, in Dow, Heikkila v. Carver, 378 N.W.2d 214 (S.D.1985), and Prentice v. Classen, 355 N.W.2d 352 (S.D.1984), recognized that foreclosure of land contracts can involve unjust enrichment through forfeiture. Earlier cases rejected such arguments by generally holding that there was no forfeiture because the Seller, in such a case, was merely enforcing the contract as agreed. Severson, 52 S.D., at 24, 216 N.W., at 583; Hickman v. Long, 34 S.D. 639, 150 N.W. 298 (1914). This rule was criticized as inequitable by Professor Cor-bin in 1931, see, Corbin, The Right of a Defaulting Buyer to the Restitution of Installments Paid, 40 Yale L.J. 1013 (1931), cited in Dobbs, Remedies § 1214, p. 864 (1972). Corbin’s position, as set out in Dobbs, was adopted by the Connecticut Supreme Court in Vines v. Orchard Hills, Inc., 181 Conn. 501, 510-12, 435 A.2d 1022, 1028 (1980), (quoted approvingly in Heikkila, 378 N.W.2d, at 219). Numerous other courts have followed the same path:
[Traditional analysis would suggest that forfeiture would follow. But along this dimension, too, the courts have been actively reforming the law. Increasingly they are holding that forfeiture may not be “free” and that the Seller must return the payments he has received insofar as they exceed his actual damages.
G. Nelson and D. Whitman, Real Estate Finance Law, § 3.29, p. 100 (2nd Ed.1985). The last sentence appears to be the rule in a nutshell. Cases cited in support of the above statement include Moran v. Holman, 501 P.2d 769 (Alaska 1972); Randall v. Riel, 123 N.H. 757, 465 A.2d 505 (1983); Morris v. Sykes, 624 P.2d 681 (Ut.1981); and Howard v. Bar Bell Land and Cattle Co., 81 Idaho 189, 340 P.2d 103 (1959). See also, Freedman v. Rector, Wardens and Vestrymen of St. Mathias Parish, 37 Cal.2d 16, 230 P.2d 629 (1951) (Denial of restitution violate public policies against forfeitures, penalties, and unjust enrichment). In Moran, the Alaska Supreme Court observed that “equity abhors a forfeiture”, a principle observed in South Dakota at least since 1899: “Forfeitures have [352]*352always been considered as odious in the law, and courts of law, circumscribed as their jurisdiction is, struggle against them.” Barnes v. Clement, 12 S.D. 270, 277, 81 N.W. 301 (1899). Because the legislature consciously invoked equity in the form of SDCL 21-50-2, we reject Sellers’ position. We reaffirm Dow v. Noble.3
II. Retrospective Application of Dow v. Noble.
Sellers next argue that Dow v. Noble, 380 N.W.2d 359 (S.D.1986), should not be applied here because they relied, under their contract for deed, upon earlier South Dakota caselaw. However, the keystone emphasis in Sellers’ argument is S.D. Constitution Article VI, Sec. 12, which provides that “[n]o ex post facto law, or law impairing the obligation of contracts or making any irrevocable grant or privilege, franchise or immunity, shall be passed.” Thus, their argument is double-barrelled.
Authorities from this jurisdiction and elsewhere, establish that there is no “black letter” prohibition on applying Dow retroactively: 4
The provision of the Federal Constitution is that no state “shall pass any ... law” impairing the obligation of contracts, (note omitted). This prohibition, according to the rule of the federal courts and most state courts, is directed only against impairment by legislation, and not by judgments of courts. There is no vested right in the decisions of a court, and a change of decisions of a state court does not constitute the passing of a law, although the effect of such change is to impair the validity of a contract made in reliance on prior decisions, (note omitted, emphasis supplied)
16A Am.Jur.2d, Constitutional Law § 70S, at 712-13 (1979). Here, SDCL 21-50-2 and predecessors have been on the books since 1913. Therefore, the point at issue here is not really SDCL 21-50-2, but was Sellers’ retention of payments a forfeiture? This is a matter of equity, the principles of which are ancient.
While this Court has, in the past, declined to give retrospective application to a new rule, as in Rollinger v. J. C. Penney Co., 86 S.D. 154, 192 N.W.2d 699 (1971), Baatz v. Arrow Bar, 426 N.W.2d 298 (S.D.1988), presents a situation where this Court did apply a new ruling (Walz v. City of Hudson, 327 N.W.2d 120 (S.D.1982)) retrospectively. Three criteria are used to determine whether a rule is to be given retrospective application:
1. The purpose to be served by the particular new rule;
2. The extent of reliance which has been placed upon the old rule; and,
3. The effect on the administration of justice of a retroactive application of the new rule.
Baatz, at 301. The purpose of allowing buyers to claim restitution is to prevent unjust enrichment on the part of sellers. Heikkila v. Carver, 378 N.W.2d 214, 219 (S.D.1985). As in Baatz, retroactive application is necessary to effectuate the intent and purposes of the rule. As to the degree of reliance Sellers may have placed upon earlier case law, Severson indicated that the language of R.C.1919, § 2915 (now codified in SDCL 21-50-2) could be given a broad reading, as shown in our treatment of Issue I, supra. Further, this Court, in Rollinger, 86 S.D., at 164 n. 6, 192 N.W.2d, at 704 n. 6, indicated that the defendant was engaged in a practice (revolving charge accounts) that had never been declared usurious by a court in any state. [353]*353Here, the rule urged by Sellers had been under attack since 1931. See Corbin, The Right of a Defaulting Buyer to the Restitution of Installments Paid, 40 Yale L.J. 1013 (1931). As shown in Issue I, numerous courts have ruled against sellers in this situation, including Howard v. Bar Bell Land and Cattle Co., 81 Idaho 189, 340 P.2d 103 (1959), which was handed down long before creation of this contract. Regarding an effect on the administration of justice from a standpoint of efficiency or volume, we visualize no great wave of heightened litigation.
We have weighed the inequity imposed by retroactive application, as mentioned in Fisher v. Sears, Roebuck and Co., 88 S.D. 1, 5, 214 N.W.2d 85, 87 (1974). In this case we find that greater inequity would result by giving Dow only prospective effect. The Constitution neither prohibits nor requires retrospective effect of judicial decisions. Vogt v. Billion, 405 N.W.2d 635 (S.D.1987). Retrospective application of Dow does not, in our view, present a risk of inequitable results because balancing of the equities between Sellers and Buyers is inherent in Dow and SDCL 21-50-2. The only loss to sellers is the possibility of reaping a windfall.
III. Balancing the Equities
Sellers’ third argument entails six individual allegations of error:
1. The trial court’s determination that $20 per acre fair rental value for cropland was incorrect;
2. Improvements made by Buyers were counted twice;
3. All costs of original sale were not allowed as detriment to Sellers;
4. Sellers’ increased income tax liability from repossession should have been considered;
5. Income tax paid by Sellers on interest payments received from Buyers should have been considered; and,
6. Income tax savings of the Buyers should have been considered.
We reject Sellers’ first assertion that the trial court’s assessment of rental value was not based on the evidence. Seller Reuben Beitelsbacher testified at trial that cash rental of cropland or pasturage was in the $20 to $25 range. It is beyond cavil that a party can claim no better version of the facts to which he himself has testified.
Sellers’ second allegation, that improvements were counted twice, is substantiated by the evidence. The improvements consisted of a well dug in 1983, reroofing a barn, carpeting, corral repair, and grain bins, totalling $15,248. These were apparently considered in the appraisals made of the property, and thus were counted already, before the trial court added them as benefits to Sellers. Appraiser Gerhanter made specific reference to the modernity and good repair of the house, the “good utility of the other buildings”, the storage bins, and the new well (the old one had dried up). Daniel Chase’s appraisal makes reference to the house carpeting, grain bins, and well. The trial court, in adding the value of the improvements to the benefits Sellers received, counted these assets twice.
We reject Sellers’ claim that the trial court erred in apportioning the costs of the 1977 sale among the parties. Sellers, by the trial court’s calculations, received 61 percent of the contract purchase price. In adjusting the equities under SDCL 21-50-2, we find no error in allowing Sellers only 39 percent of the sale expense as a credit.
The fourth, fifth and sixth allegations are difficult to analyze, as Sellers cite no authority beyond Dow v. Noble, 380 N.W.2d 359 (S.D.1986), which makes no mention of income taxes. As in Dow, at 361, where this Court denied a buyer interest on a down payment, we, therefore, hold that the trial court was not clearly erroneous in disregarding these three claims. A relatively detailed analysis of caselaw involving foreclosure restitution, see G. Nelson and D. Whitman, Real Estate Finance Law, § 3.29, p. 100-108 (2nd. Ed.1985), also does not refer to these tax aspects. Sellers’ tax arguments would take the Court far afield. Federal income tax liabilities [354]*354are not what these parties were contracting for. Their contract dealt with land and payments.
Summarizing Sellers’ six claims made under this issue, we find error on only the second, double counting of improvements. The remaining five claims are without merit.
IV. Default Judgment
There was no abuse of discretion in the trial court’s decision to set aside the default judgment against Buyer Antoinette Winther. A motion to vacate a judgment under SDCL 15-6-60(b) is within the sound discretion of the trial court and will not be disturbed on appeal absent an abuse of discretion. Haggar v. Olfert, 387 N.W.2d 45 (S.D.1986); Strouse v. Olson, 397 N.W.2d 651 (S.D.1986). In this regard we note that no certificate of readiness for trial was served on Antoinette, in violation of SDCL 15-6-40(b). Although 15-6-40(b) provides that such requirements may be dispensed with by the trial judge, he need not do so. The statute is permissive in phraseology. In the circumstances of this case, we do not deem the trial court’s decision on this issue to be an abuse of discretion. Further, this default judgment, as a practical matter, seems only to affect the trial court’s distribution of attorney’s fees, part of which were, initially, to be paid by Antoinette. Sellers attorney’s fees are, by the trial court’s later judgment, to be deducted from the Buyers’ restitution, so this issue is an irrelevance.
B. Buyers’ Notice of Review (No. 16389)
Buyers challenge the trial court’s adjustment of equities on four grounds: 1) A WEB water easement penalty should not be counted as a detriment to the Sellers; 2) the trial court failed to determine what portion of the Sellers’ attorney’s fees were reasonable; 3) interest on the value of Buyers’ payments should be considered as a benefit to Sellers; and 4) increases in “ASCS crop bases” should be considered as benefits to Sellers. We disagree.
The WEB penalty issue arose through Buyers' decision to deny WEB, a rural water supplier, an easement across the property, necessitating changes in WEB’s construction. To hook up to the WEB water distribution system, owners of the property, as a result of Buyers’ decision, must pay a penalty of $11,958. The evidence at trial indicates that one well had gone dry on the property, and the artesian water from the well dug by Buyers stained clothing. Further, the appraisals of Chase and Gerhanter included access to WEB water as part of their determination of the property’s value, a factor which is offset, to a degree, by the WEB penalty. The trial court did not err on this question.
As to attorney’s fees, these were awarded as part of the balancing of equities under SDCL 21-50-2. “We believe that the Sellers’ detriment, including fees accrued in actions related to the property, also is properly part of the trial court’s balancing process under SDCL 21-50-2.” Dow v. Noble, 380 N.W.2d 359, 360 (S.D.1986). These fees are not awarded as costs. Dow, id. The trial court, thus, did not err in its award. Also, Elden Winther’s proposed Finding of Fact No. 14 conceded that Sellers had incurred $7,903 in attorney’s fees, as a detriment.
We likewise reject Buyers’ argument that interest should have been calculated on the principal payments received by the Sellers. This appears to be a variant of an argument this Court rejected in Dow, where the Buyers argued, without citing authority, that interest should have been calculated on their down payment. Now, as then, no authority is cited. Lacking same, we dismiss the argument. Corbly v. Matheson, 335 N.W.2d 347 (S.D.1983). As in Dow, at 361, we hold that “the trial court was not clearly erroneous in not considering this item.”
Finally, we deem Elden Winther’s assertion that increased participation in ASCS crop programs should have been considered, to be waived. Again, no authority is cited which indicates error by the trial court. See Dow, at 361.
Affirm in part, reverse and remand in part.
[355]*355WUEST, C.J., and MORGAN, J., concur.
SABERS and MILLER, JJ., dissent.