¶ 1. Plaintiff appeals the denial of her motion to enforce the terms of a stipulated amended final order for property settlement and child support. The order sets a schedule for property settlement and child support payments and includes an avoidable late fee provision triggered by defendant's failure to pay within the timetables and grace periods established by the order. The family court refused to enforce the late fee provisions contained in its own order. We reverse without- reviewing the grounds of the family court’s decision because the doctrine of res judicata precludes defendant from collaterally attacking the validity of the order. We reverse and remand for enforcement of the order.
¶ 2. The parties were divorced by the family court’s final order and decree of divorce in December 1996. The relevant provisions of that order require defendant to pay child support and spousal maintenance beginning in December 1996, and a total of $143,600 in property settlement over a six year period that commenced December 1, 1998. Interest on arrearages ran at six percent annually for the first three years, and seven percent thereafter.
¶3. In April 1998, plaintiff filed the first of two motions for contempt and judgment against defendant because of his repeated failure to timely pay spousal maintenance and child support. Defendant had established a pattern of making payments more than a month after they were due, and plaintiff claimed that defendant’s tardiness caused her financial *572 difficulties. The record does not indicate how the first motion was resolved, but by March 1999 plaintiff was again forced to move for contempt and judgment, this time because of nonpayment. Plaintiff’s motion detailed defendant’s failure to make any of the property settlement payments. Defendant had also stopped making child support and spousal maintenance payments.
¶ 4. While the second contempt motion was pending, the parties reached a new agreement and stipulated to an amended order. The Chittenden Family Court incorporated this stipulation into its amended final order on June 6,1999. The amended order established a schedule for the payment of the property settlement balance — all of which was still owing and part of which was in arrears at the time — plus interest. In an attempt to secure compliance with this timetable, and avoid future contempt issues with regard to maintenance and child support, the amended order provided for the assessment of late fees. For all late payments, defendant would be charged a fee calculated at eight percent of the monthly sum owed — both principal and interest. The fees are capped at $11,100 over the life of the agreement. Defendant could avoid the late fees by on-time payment. If defendant successfully made all the required payments within thirty days of their due dates, the amended order provided that plaintiff would forgive the last four property settlement payments for a possible total of $11,100.
¶ 5. Defendant subsequently failed to make several of the scheduled payments. Plaintiff moved to enforce the terms of the amended final order, seeking the missing payments, late fees, and attorney’s fees. Defendant responded with a motion to strike the late fee provision arguing that it was usurious. In a subsequent ruling, the same judge who had signed the amended final order that plaintiff is currently trying to enforce denied plaintiff’s motion. The judge ruled that the late fee provision was inapplicable to child - support payments because there is already a separate statutory scheme for enforcing child support- orders. With respect to the property settlement, the judge ruled that the state’s lending laws, 9 V.S.A. §§ 41a, 42, 44, barred the late fees that the court termed as “unreasonable, if not unconscionable.” This appeal followed.
¶ 6. We conclude that the doctrine of res judicata precluded the family court from refusing to enforce the amended final order. In so doing, we reaffirm the principles recently articulated in
Johnston v. Wilkins,
¶ 7. Defendant’s argument against the application of the late fee provision amounts to an improper collateral attack on the order. Defendant did not directly appeal the amended final order at the time it was issued because he voluntarily agreed to the provision he now argues is usurious and barred by statute. He stipulated, with the aid of counsel, to the amended final order that added the late fee provision so as to resolve contempt motions pending against him because .of his ongoing failure to make payments *573 required by the original divorce order. Furthermore, defendant, like the defendant in Johnston, did not move for relief from the judgment under V.R.C.P. 60(b). He did not voice any opposition to the judgment until plaintiff moved to enforce it against him in response to his admitted failure to abide by its terms.
¶ 8. “Res judicata bars litigation of a claim or defense if there exists a final judgment in former litigation in which the parties, subject matter, and causes of action are identical or substantially identical.”
Lamb v. Geovjian,
¶ 9. The stipulation at issue here was incorporated into a final order. The parties are identical. The subject matter — securing timely payment of the sums owed pursuant to the original final order — was central to the litigation of the contempt motions that the stipulated amended order resolved. Defendant argues that res judicata is improper here because plaintiff initiated the motion that led to the family court order now on appeal. This argument is unavailing because res judicata applies equally to claims and defenses. The family court order on review is based entirely on defenses that defendant argued below.
¶ 10. ‘“The doctrine of res judicata serves vital public interests beyond any individual judge’s ad hoc determination of the equities in a particular case.’”
Id.
at 382,
¶ 11. The doctrine’s purpose is to deliver finality and repose — the very things that plaintiff thought she was securing when she stipulated to the late fee provision in exchange for her agreement to drop the contempt and judgment motion. Res judicata required defendant to bring forth all of his objections to the order before it became final, and if necessary, to renew them immediately on direct appeal.
¶ 12. Finality and repose sometimes must yield to the interests of justice, however. We have consistently stated that aside from direct appeals to this Court V.R.C.P. 60(b) is the exclusive avenue for relief from judgments in family court. See
Trahan v. Trahan,
¶ 13. The stipulation entered into by the parties here, and subsequently incorporated into the court’s amended final order, represents the essence of a calculated tactical decision. Defendant was facing a second contempt and judgment motion for nonpayment at the time. He apparently concluded that it was to his advantage to resolve the contempt issue by settling for a new payment schedule with the possibility of additional fees for late payment. In return, plaintiff agreed to drop the contempt and judgment motions and add a provision to the order that would have freed defendant (if he faithfully made payments) from having to pay up to $11,100 in property settlement that he otherwise would have owed under the previous order. This is not a case where defendant acted under duress, and there is no suggestion that there was anything improper about the bargaining process that yielded the stipulation. See, e.g.,
Putnam v. Putnam,
¶ 14. Rule 60(b)(6) also requires the party seeking relief to bring the motion within a reasonable amount of time from judgment. In this case, defendant waited more than three years before raising the late fee issues. The amended final order is dated June 6, 1999; the memorandum of law where defendant first raises the issue in court is dated March 5, 2003. When a party has delayed so long in seeking relief under V.R.C.P. 60(b)(6), that party bears the burden of showing that extraordinary circumstances caused that delay.
Riehle,
Reversed and remanded for enforcement of the Chittenden Family Court’s amended final order dated June 6,1999.
