delivered the opinion of the court:
Defendant-appellant, Janice J. Scullin, formerly married to Peter C. McAdams, plaintiff-appellee, filed a “Motion for Judgment” for the enforcement of arrearage of back child support payments pursuant to the decree of divorce. The divorce decree was entered on September 11, 1969, and incorporated the child custody and child support agreement of the parties. The decree for divorce stated:
“That the care and custody of the child of the parties, namely, JOHN CLARK ADAMS, bom October 24,1966, is awarded to the defendant, JANICE J. McADAMS, subject to rights of visitation upon the part of the plaintiff, PETER C. McADAMS, and the defendant is permitted to take said child outside of the State of Illinois to reside with her, and the plaintiff, regardless of defendant’s place of residence, shall have the privilege of having such child with him during two (2) months of each summer, provided, that he shall pay the cost of the child’s transportation for such two (2) month visitation period, all in accordance with the terms of the said agreement entered into between the parties on August 30, 1969; • 0
The child custody agreement which was incorporated into the decree of divorce stated:
“CUSTODY AND VISITATION
Wife shall have the care, custody and control of the child of the parties, hereinabove named, subject to reasonable rights of visitation upon the part of husband. It is expressly contemplated by the parties that the wife may seek employment outside the State of Illinois and may take said minor child outside of Illinois to reside with her in such event. Husband shall, regardless of wife’s place of residence, have privilege of having said child with him during (2) months of each summer. Husband shall pay the cost of the child’s transportation for such two (2) month visitation period.
CHILD SUPPORT
The husband shall pay to the wife, as and for child support, the sum of ONE HUNDRED THIRTY DOLLARS (*130.00) per month, plus medical and hospital bills reasonably incurred on behalf of the minor child of the parties, until said child complete his pre-college education. * * s”
After a hearing, in which the only issue was whether appellee owed the *130 per month for the two months in each year in which he had custody of the child from 1970 to 1976, the trial court denied appellant’s motion for child support payments for the previous summer support months, but ordered “[t]hat the monthly child support payments will be due and payable the summer periods from this date on.” The court’s order was based on a finding that the appellant had waived payments during a 1970 telephone conversation in which she “[a]greed with plaintiff that he need not make the payments during said visitation periods.”
The only issue appellant raises in this appeal is whether the trial court erred in failing to order appellee to pay past due child support for the summer months during which the child resided with his father, the appellee. Appellee contends that the appellant is estopped from asserting her right to said support payments, or in the alternative, that the parties had entered into a modification of the divorce decree in which summer support payments were waived. The alleged modification of the decree resulted due to the following: in 1970, appellant waived the summer support payments in exchange for appellee’s forbearance in filing a contempt proceeding sometime after 1974 for having custody of the child in Massachusetts when she was not employed.
Past-due installments of child support payments are vested rights and cannot be modified by a court. (Escott v. Escott (1975),
In Escott v. Escott (1975),
In the case before us, the custody provision of the divorce decree stated that the child support was to be paid per month. (See Escott v. Escott (1975),
Appellee relies on Strum v. Strum (1974),
We next turn to appellee’s contention that the parties had entered into a modification of the divorce decree as set out in the beginning of this opinion. In determining the validity and effect, as between divorced spouses, of an agreement by which the former wife releases the former husband from his obligation under the provisions of the divorce decree to pay child support to her, the first question to be considered is whether the agreement meets the tests of validity applicable to all releases. In particular, the agreement must be supported by a valid consideration. (Johnson v. Johnson (1975),
In Wolfe v. Wolfe (1940),
We have examined the numerous other cases appellee has cited in his brief and found that none of them are controlling.
For the reasons stated herein, we conclude that the trial court erred in failing to order appellee to pay appellant the arrearage for the support payments during the summer months when the child resided with his father. Therefore, this cause is remanded to the trial court to enter an order not inconsistent with this opinion.
Remanded with directions.
KARNS and JONES, JJ., concur.
Notes
Even if appellee’s contention were correct, he would still be liable for the five years in which Mrs. Scullin was employed while having custody of the child in Massachusetts.
