AMUNDSON, Justice.
Robert Vander Woude (Robert) appeals from an order of the circuit court ordering him to pay child support arrearages of $5,227.50, plus prejudgment interest. We affirm.
FACTS
Robert and Donna J. Vander Woude, n/k/a Donna J. Jones (Donna), were divorced on February 11, 1974. Donna received physical custody of the parties’ two minor children, Michelle and Deonne, and Robert was ordered to pay $42.50 per week per child as child support.
Thirteen years after the divorce, between May 1987 and December 1988, Robert was off from his job at Morrell’s due to a labor dispute and claimed to be unable to make his child support payments. During this time, the parties’ oldest child, Michelle, reached the age of majority. Robert did not make the required weekly child support payments of $85 between May 1, 1987, and Michelle’s eighteenth birthday on February 16, 1988, nor did he make weekly $42.50 support payments between February 16, 1988, and December 3, 1988. The missed child support payments during this period totaled $5,227.50.
After December 3, 1988, Robert returned to work and resumed his weekly child support payments of $42.50. However, Robert missed a significant number of $42.50 payments between his return to work and August, 1990, when the parties’ youngest [363]*363daughter, Deonne, attained majority. Robert’s missed weekly payments for this period of time totaled $1,572.50.
In October, 1990, Donna wrote Robert informing him that he was in arrears on his child support in the amount of $1,572.50 for the period following his return to work until Deonne’s eighteenth birthday. When Robert did not reply, Donna wrote a second letter on November 11, 1990, threatening legal action if Robert did not pay the $1,572.50 by December 1, 1990. In the letter, Donna stated: “No more support after that! I know that has got to be a thorn out of your side.”
On December 23, 1990, Robert sent a letter and a check for $1,572.50 to Donna. Robert wrote the words “paid in full” on the memo portion of the check.
Donna cashed the check and wrote Robert a letter taking exception to portions of his letter that had accompanied the check. Donna stated that while she had thought of letting the earlier child support arrearages of $5,227.50 pass, she now regretted that decision.
Donna subsequently filed a motion for an order to show cause seeking a judgment against Robert for the $5,227.50 in child support arrearages. After a hearing on the matter, the circuit court issued a memorandum opinion awarding Donna $5,227.50, plus prejudgment and post-judgment interest. Robert appeals.
ISSUES
1. Whether an agreement between divorced parents modifying child support arrearages is enforceable?
2. Whether an accord and satisfaction settling child support arrearages existed?
3. Whether the trial court erred in awarding prejudgment interest on each installment of child support not paid?
ANALYSIS
1. Modification of Child Support Ar-rearages by Agreement
Parents are obligated to provide support for their children. This obligation is not only a matter of public policy, but is also statutory. SDCL 25-5-18.1; SDCL 25-7-6.1. This court has stated that a parent’s duty to support his children is paramount and other debts of the parent are secondary. Donohue v. Getman, 432 N.W.2d 281, 283 (S.D.1988); Brunick v. Brunick, 405 N.W.2d 633, 634 (S.D.1987). “The children’s best interest requires that they be supported.” Stach v. Stach, 369 N.W.2d 132, 136 (S.D.1985).
Statutorily, courts and administrative entities may not retroactively modify past due child support obligations except for the period in which there is a pending petition for modification. SDCL 25-7-7.3. Robert asserts that while SDCL 25-7-7.3 limits retroactive modification by a court or administrative agency, it does not prohibit retroactive modification of child support ar-rearages by parents themselves. Justice Morgan in his special writing in Kier v. Kier, 454 N.W.2d 544 (S.D.1990), asserted that SDCL 25-7-7.3 does not expressly prohibit an obligee parent from modifying a payment. Id. at 548 (Morgan, J., concurring in part and dissenting in part).
However, while SDCL 25-7-7.3 does not directly address retroactive modification of a support obligation by a parent, SDCL 25-7A-17 requires that any agreement relieving a party of its support obligations be in writing and have the approval of the court.
An agreement between parents or other responsible persons relieving a party of any duty of support or responsibility or purporting to settle past, present or future support obligations as settlement or prepayment may not act to reduce or terminate any rights of the department of social services or any support obligee to recover from parents or other responsible persons for support provided, unless the department or any support obli-gee has consented to the agreement in writing and the agreement has been approved by a court of competent jurisdiction. (Emphasis supplied.)
[364]*364SDCL 25-7A-17. “It is clear the statute is designed to restrict a party’s ability to contract away a duty of support.” Sharp v. Sharp, 422 N.W.2d 443, 447 (S.D.1988). Robert and Donna’s alleged agreement to forgive Robert’s $5,227.50 in child support arrearages was primarily an oral agreement, although it was also alluded to in several letters between the parties. Nonetheless, the agreement was never approved by a court, and thus it is not enforceable.
Furthermore, this court does not look favorably upon agreements to modify child support that have not received the court’s approval. “This court does not approve of personal modifications to divorce decrees absent court amendment or. a binding agreement; only a trial court may retroactively modify child support payments based on the payor’s financial situation and the children’s welfare.” Stack, 369 N.W.2d at 136 (citation omitted). Similarly, we hold that Robert and Donna were without authority to modify or forgive Robert’s child support arrearages without court approval.
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AMUNDSON, Justice.
Robert Vander Woude (Robert) appeals from an order of the circuit court ordering him to pay child support arrearages of $5,227.50, plus prejudgment interest. We affirm.
FACTS
Robert and Donna J. Vander Woude, n/k/a Donna J. Jones (Donna), were divorced on February 11, 1974. Donna received physical custody of the parties’ two minor children, Michelle and Deonne, and Robert was ordered to pay $42.50 per week per child as child support.
Thirteen years after the divorce, between May 1987 and December 1988, Robert was off from his job at Morrell’s due to a labor dispute and claimed to be unable to make his child support payments. During this time, the parties’ oldest child, Michelle, reached the age of majority. Robert did not make the required weekly child support payments of $85 between May 1, 1987, and Michelle’s eighteenth birthday on February 16, 1988, nor did he make weekly $42.50 support payments between February 16, 1988, and December 3, 1988. The missed child support payments during this period totaled $5,227.50.
After December 3, 1988, Robert returned to work and resumed his weekly child support payments of $42.50. However, Robert missed a significant number of $42.50 payments between his return to work and August, 1990, when the parties’ youngest [363]*363daughter, Deonne, attained majority. Robert’s missed weekly payments for this period of time totaled $1,572.50.
In October, 1990, Donna wrote Robert informing him that he was in arrears on his child support in the amount of $1,572.50 for the period following his return to work until Deonne’s eighteenth birthday. When Robert did not reply, Donna wrote a second letter on November 11, 1990, threatening legal action if Robert did not pay the $1,572.50 by December 1, 1990. In the letter, Donna stated: “No more support after that! I know that has got to be a thorn out of your side.”
On December 23, 1990, Robert sent a letter and a check for $1,572.50 to Donna. Robert wrote the words “paid in full” on the memo portion of the check.
Donna cashed the check and wrote Robert a letter taking exception to portions of his letter that had accompanied the check. Donna stated that while she had thought of letting the earlier child support arrearages of $5,227.50 pass, she now regretted that decision.
Donna subsequently filed a motion for an order to show cause seeking a judgment against Robert for the $5,227.50 in child support arrearages. After a hearing on the matter, the circuit court issued a memorandum opinion awarding Donna $5,227.50, plus prejudgment and post-judgment interest. Robert appeals.
ISSUES
1. Whether an agreement between divorced parents modifying child support arrearages is enforceable?
2. Whether an accord and satisfaction settling child support arrearages existed?
3. Whether the trial court erred in awarding prejudgment interest on each installment of child support not paid?
ANALYSIS
1. Modification of Child Support Ar-rearages by Agreement
Parents are obligated to provide support for their children. This obligation is not only a matter of public policy, but is also statutory. SDCL 25-5-18.1; SDCL 25-7-6.1. This court has stated that a parent’s duty to support his children is paramount and other debts of the parent are secondary. Donohue v. Getman, 432 N.W.2d 281, 283 (S.D.1988); Brunick v. Brunick, 405 N.W.2d 633, 634 (S.D.1987). “The children’s best interest requires that they be supported.” Stach v. Stach, 369 N.W.2d 132, 136 (S.D.1985).
Statutorily, courts and administrative entities may not retroactively modify past due child support obligations except for the period in which there is a pending petition for modification. SDCL 25-7-7.3. Robert asserts that while SDCL 25-7-7.3 limits retroactive modification by a court or administrative agency, it does not prohibit retroactive modification of child support ar-rearages by parents themselves. Justice Morgan in his special writing in Kier v. Kier, 454 N.W.2d 544 (S.D.1990), asserted that SDCL 25-7-7.3 does not expressly prohibit an obligee parent from modifying a payment. Id. at 548 (Morgan, J., concurring in part and dissenting in part).
However, while SDCL 25-7-7.3 does not directly address retroactive modification of a support obligation by a parent, SDCL 25-7A-17 requires that any agreement relieving a party of its support obligations be in writing and have the approval of the court.
An agreement between parents or other responsible persons relieving a party of any duty of support or responsibility or purporting to settle past, present or future support obligations as settlement or prepayment may not act to reduce or terminate any rights of the department of social services or any support obligee to recover from parents or other responsible persons for support provided, unless the department or any support obli-gee has consented to the agreement in writing and the agreement has been approved by a court of competent jurisdiction. (Emphasis supplied.)
[364]*364SDCL 25-7A-17. “It is clear the statute is designed to restrict a party’s ability to contract away a duty of support.” Sharp v. Sharp, 422 N.W.2d 443, 447 (S.D.1988). Robert and Donna’s alleged agreement to forgive Robert’s $5,227.50 in child support arrearages was primarily an oral agreement, although it was also alluded to in several letters between the parties. Nonetheless, the agreement was never approved by a court, and thus it is not enforceable.
Furthermore, this court does not look favorably upon agreements to modify child support that have not received the court’s approval. “This court does not approve of personal modifications to divorce decrees absent court amendment or. a binding agreement; only a trial court may retroactively modify child support payments based on the payor’s financial situation and the children’s welfare.” Stack, 369 N.W.2d at 136 (citation omitted). Similarly, we hold that Robert and Donna were without authority to modify or forgive Robert’s child support arrearages without court approval. The trial court found Robert obligated for $5,227.50 in arrears on his child support and this finding certainly is not one where we are left with a definite and firm conviction that a mistake was made. Hilbrands v. Hilbrands, 429 N.W.2d 750, 751 (S.D.1988).
2. Accord and Satisfaction
Robert next asserts that Donna’s endorsement of his check marked “paid in full” serves as an accord and satisfaction of all his child support arrearages. Robert points out that neither our accord and satisfaction statutes nor the corresponding case law specifically exclude child support payments from application of accord and satisfaction. It is true that SDCL 20-7-1 through SDCL 20-7-4 does not specifically exclude child support payments. It is also true that we have not previously addressed the application of accord and satisfaction to child support payments.
We must, however, look at the whole law and not merely those statutes that Robert finds favorable to his case. An accord and satisfaction agreement forgiving child support arrearages would still be subject to SDCL 25-7A-17 and thus require the approval of the court in order to be valid. Robert may not creatively circumvent the approval of the court necessary to modify or eliminate his child support obligation by alleging that an accord and satisfaction existed between him and Donna since the payments are for the children’s benefit and not a debt due Donna per se. Peterson v. Peterson, 434 N.W.2d 732, 738 (S.D.1989). Robert’s child support arrearages of $5,227.50 are not a debt incurred on a loan, in a business transaction, or in a contract dispute, and, therefore, are not subject to elimination by the pleading of an accord and satisfaction due to the special nature of the obligation.
3. Prejudgment Interest
Last, Robert asserts that the trial court erred in awarding Donna prejudgment interest on the unpaid child support arrearag-es. A child support obligation becomes a judgment by operation of law as it becomes due and owing. SDCL 25-7-7.4. As a judgment, a child support obligation is subject to interest at the judgment rate. SDCL 21-1-13.1; SDCL 15-16-3. “An award of interest on support arrearages is a matter of judicial discretion.” Kier, 454 N.W.2d at 546.
Robert contends that the trial court abused its discretion in awarding interest, in that Robert had an alleged good-faith belief that he and Donna had a valid agreement forgiving his arrearages. We do not agree. The trial court’s reasoning in awarding prejudgment interest follows our decision in Kier, where the father claimed that he quit paying child support because the mother led him to believe that his obligation had been terminated. Id. at 545. The mother had returned one child support payment to the father and made the comment, “keep the check, you’re not seeing Tracy.” Id. Subsequently, the father kept the check and did not tender the next ten child support payments. Id. On appeal, we determined that there was no agreement between the parties regarding the termination of child support, nor had the [365]*365mother made any representations which would have supported a conclusion by the father that he was no longer obligated to pay child support. Id. at 547.
In the case before us, Donna did not demand child support payments during the period in which Robert was not working at Morrell’s. However, Donna’s failure to demand child support payments did not negate Robert’s obligation to make payments, which he did resume when he returned to work. Furthermore, Donna and Robert had no agreement whereby Robert’s child support obligation was terminated. The only mention of terminating Robert’s ar-rearages for the period in which he was laid off was made in Donna’s letter to Robert where she stated: “Even though you lied, I was going to let pass all those months of child support due ... I now regret that decision.” As in the Kiev decision, we do not find sufficient justification for Robert’s belief that his child support obligation had been terminated. Accordingly, we do not find that the trial court abused its discretion in awarding prejudgment interest and its award of same is affirmed.
Affirmed.
MILLER, C.J., and WUEST, J., concur.
SABERS, J., concurs specially and concurs in result.
HENDERSON, J., concurs in part and dissents in part.