delivered the opinion of the court:
Thе husband and wife were divorced pursuant to a decree filed October 25, 1972. They had two children, ages 10 and 14 years. The divorce dеcree incorporated the child-custody and child-support agreement of the parties. The wife was given custody of the children for the school year with visitation rights for the husband. The husband was given custody of the children for a period of 2 months during the summer with visitatiоn rights for the wife. The child-support provision of the divorce decree stated that the husband “shall pay child support of $300 per month beginning by November 15, 1972, and by the 15th of each month thereafter * * *." The husband paid all of his monthly child-support installments except thosе for the months of June and July of 1973. The husband had custody of the children for those 2 months.
In the wife’s action filed against the husband for recovery of the child-support arrearage, the husband defended by arguing that he had had custody of the children for the 2 months for which he did not mаke payments, that he had incurred expenses on behalf of the children approximately equaling the amount of the unpaid installments, that the wife’s expenses for the children had decreased by about that same amount in their absence, and that, therefore, he should not be required to pay child support for the months of June and July. Additionally, the husband filed a motion to modify the child-supрort provision of the divorce decree based upon the reasoning just stated.
The court found the husband to be $600 in arrears in сhild-support payments and held the husband in contempt of court. The court also denied the husband’s motion to modify the child-suppоrt provision. The husband appeals from these rulings.
The husband did not object to the propriety of the June and July child-support installmеnts before they became due. He simply failed to make those two payments. The husband is obligated to pay the installments for June and July, and there is no legal remedy which would permit him to avoid this obligation. Past-due installments of child support are vested rights and cаnnot be modified by a court (Strum v. Strum,
However, as an exception to the general rule that past-due child-support installments become vested rights which cannot be modified, equity will sometimes intervene to assist the spouse who has failed to make child-support payments. The husband relies upon Bramson v. Bramson,
An important fact distinguishes Bramson, Earles, and Strum from the instant case. In those cases, the custody of the children had been given to thе wives, and the parties did not forsee, much less agree in advance, that the children would live outside the homes of the wives. Here, the parties agreed that the children would reside with the husband for 2 months during the summer. The child-custody and child-support agreement was сlear on its face. The wife would have custody for 10 months, and the husband would have custody for 2 months. The husband was to make monthly child-supрort payments, and no exceptions were provided. The husband is not entitled to an equitable credit because the agrеement of the parties provides to the contrary. Furthermore, the wife testified that her expenses for the children did not decline in their temporary absence from her home because she still had to make payments on the mortgage, other loаns, maintenance of the house, summer clothing for the children, and so on.
The court denied the husband’s motion to modify the child-support provision of the divorce decree. Modification of a divorce decree will be granted only when the proponent establishes that a substantial change in the circumstances of the parties has rendered modification necessary (Grеgory v. Gregory,
Finally, the husband also assigns as error the court’s refusal to allow the husbаnd’s attorney to testify regarding the negotiations which led to the child-custody and child-support agreement between the parties. The offer of proof showed that the attorney would have testified that he did not recall that the subject of child-support рayments for the summer months had, or had not, been raised dining the negotiations. The child-custody and child-support agreement was clear and complete on its face. All preliminary negotiations merge into the written agreement, and the presumption is that thе parties included every material term (Cleary, Handbook of Illinois Evidence § 16.1 (2d ed. 1963)). Moreover, the offer of proof indicаtes that the substance of the attorney’s testimony would not have changed the result. The court’s refusal to allow this testimony was prоper.
The court acted properly in holding the husband in contempt of court for failing to make the child-support payments for June and July of 1973, in denying the husband’s request for an equitable credit toward his child-support obligation, in denying the husband’s motion for a modification of the child-support provision of the divorce decree, and in refusing to allow the husband’s attorney to testify. The judgment of the trial court is, therefore, affirmed.
Affirmed.
SIMKINS, P. J., and CRAVEN, J., concur.