This appeal follows the trial court’s quashing of garnishment for child support due Sheila Burnham (mother). On June 27, 1980 the Circuit Court of Jefferson County entered a dissolution decree requiring Daniel F. Burnham (father) to pay $35.00 per week for child support of one child. Subsequent to this order father paid mother various amounts at different times totaling $2,190.00 for child support. Father became disabled. Beginning in October, 1984, mother, on behalf of their minor child, received monthly social security payments varying in amount from $236 to $284 per month. Previously in September, 1984, mother received a lump-sum payment of $2537.30 from the government in respect of the disability of father. After father returned to work mother filed the present execution and garnishment proceeding against father and his employer, Chrysler Corporation, on April 17, 1986. Father filed a motion to modify the child support decree on May 26, 1986. The garnishment order was quashed in full on April 23,1987. The appeal is from that order.
For two reasons father requests dismissal of this appeal: (1) he claims garnishee is a necessary party to the appeal and (2) the pending motion to modify may resolve the issue raised here. The notice of appeal was directed to the order quashing the garnishment. Accordingly the necessary party argument is vague. All of the parties were before the trial court and are before this court. The record confirms that mother timely filed her appeal of the trial court’s order. This is sufficient to perfect the appeal.
Father’s second argument for dismissing the appeal is not well taken. The general rule in Missouri is that a trial court is without jurisdiction to modify retroactively an existing decree.
Bopp v. Bopp,
Wife brings two related claims on appeal. First she argues the trial court erred in quashing garnishment by summarily ruling that the combined total child support and social security payments made to wife between the dates of decree and garnishment exceeded the total amount of child support due. As part of this claim wife asserts father is not entitled to credit the overage of disability payments against support ar-rearages. Wife’s second claim is that the trial court erred in refusing to hold a hearing but instead it decided the issue based upon a limited stipulation of facts which compared the total amount of support owed *570 with the total amount of social security and father’s payments made to mother. Because we find the first claim of error dis-positive, we reverse and need not discuss mother’s second claim.
The final sentence of the trial court order appealed from reads: “Court orders motion to quash sustained because total payments received by respondent [mother] exceeds total support accrued since date of decree.” This court previously addressed a similar situation in
McClaskey v. McClaskey,
This court expanded the
McClaskey
holding in
Newton v. Newton,
The Missouri Supreme Court reached a different conclusion regarding credit for social security payments in
Craver v. Craver,
Craver
dealt with arrearages of maintenance payments whereas this case concerns child support arrearages. The rationale of
Craver,
however, is equally applicable. A motion to modify is required when retirement or disability triggers social security payments. As between the parties, the burden of seeking modification of the support obligation rests with the party seeking to substitute social security benefits for the amount owed under a decree.
Craver,
The Craver court recognized the difference between third party payments (by family or friends, for example) of support and social security benefits. The latter are a matter of Federal statutory allocation of funds to dependents which occurs regardless of a court decree. The entitlement is available to spouse and eligible children without regard to marital status. Our ruling does not apply to third party, nongovernmental payments made for father with the intent to meet support obligations and received by mother for that purpose.
The Missouri Supreme Court also acknowledged in
Craver
that modification in response to receipt of social security payments may not be appropriate in all cases.
Craver,
The general rule that a trial court is without jurisdiction to modify an existing decree retroactively remains in force. See,
Bopp v. Bopp,
Father also argues that the exact amount of support due was in dispute and unascertainable by the court. This is factually wrong. The amount of child support ordered is $35 per week. According to the stipulation filed with the trial court, father had personally paid a total of $2190 during the relevant period. The stipulation also contains a statement that $12,425 was due wife for child support arrearage accruing from June 27, 1980 (the date of the decree) to April 17, 1986 (the date mother filed for garnishment). After subtracting the $2190 paid by father, the accrued arrearage was ascertainable to be $10,235. Even without the stipulation, the weekly award multiplied by the proper number of weeks equals the total child support due mother. By reference to a calendar the court can accurately determine the amount of support due using simple mathematics. This figure may change if the child support is changed by the court when hearing and considering the motion to modify filed May 26, 1986 as the change relates to child support accruing after that date.
We reverse and remand. The trial court shall set aside the quashing garnishment and enforce the child support judgment in a manner not inconsistent with this opinion.
