LAVERY, J.
The defendant appeals from the trial court’s decision granting the plaintiffs motion to modify an order of child support. On appeal, the defendant argues that the trial court improperly (1) increased his child support obligation in response to the plaintiffs motion, (2) retroactively modified a prior judge’s order concerning child support payments, and (3) proceeded with the hearing on the plaintiffs motion in the absence of sworn affidavits from both parties. We disagree with the defendant’s arguments and affirm the judgment of the trial court.
The record reveals the following facts. On June 4, 1991, the plaintiff brought this action seeking the dissolution of her fifteen year marriage to the defendant. The trial in this matter was held on March 10, 1992, and by decision dated March 18, 1992, the trial court, Karazin, J., rendered judgment dissolving the parties’ marriage. At the time of the dissolution, the trial court ordered, inter alia, the continuation of a prior order of unallocated alimony and child support of $250 per week.
On May 12, 1993, the parties appeared in court on the plaintiffs motion for emergency financial relief. After a hearing on the motion, the trial court, Moran, J., ordered the defendant to pay $595 per week to the [260]*260plaintiff as child support effective as of that date. On June 8, 1993, Judge Moran entered further orders continuing the child support at $595 per week and modifying the alimony award to $365 per week, effective immediately.
The plaintiff subsequently filed a motion to modify the child support, dated September 14, 1993, which is the subject of this appeal. In that motion, the plaintiff requested that her award of child support be increased to $652 per week because the defendant had “consistently and substantially understated his net monthly income and overstated his federal tax withholding for the purpose of defrauding his children of the support to which they are entitled under the Child Support Guidelines.”1 A hearing was held on the motion on November 17, 1993. At the conclusion of this hearing, the trial court, Petroni, J., ordered that for the fourteen [261]*261week period between the date of Judge Moran’s order, May 12, 1993, through August 31, 1993, the defendant was required, pursuant to the child support guidelines, to pay child support in the amount of $652 rather than the $595 that originally had been ordered. The trial court therefore ordered that the difference of $57 be paid and added to the defendant’s support obligation. The trial court further ordered, on the basis of the documentation submitted at the hearing, that as of the date of the modification hearing, the defendant’s child support obligation be increased to $670 per week.
I
The defendant first argues that the trial court improperly increased his child support obligation in response to the plaintiffs motion to modify. Specifically, the defendant argues that neither the motion to modify nor the trial court’s decision was based on the criteria for modification set forth in General Statutes § 46b-86,2 namely, a substantial change of circumstances or a deviation from the child support guidelines. According to the defendant, if there was an error in Judge Moran’s [262]*262support order, the plaintiff should have filed a motion to open the judgment within four months of the date of the judgment.3 Since the plaintiff did not do this, the defendant argues that the plaintiff was required to prove fraud in order to justify opening the judgment. Because the court did not make a finding of fraud, the defendant therefore argues that it had no authority to modify the support order since the motion was filed more than four months after the date of Judge Moran’s order.4 We disagree with the defendant’s arguments.
The plaintiffs motion to modify alleged that the defendant’s sworn statements concerning his alleged federal tax withholding were false. At oral argument on the motion, the plaintiff stated that she was alleging fraud.5 After the hearing on the motion, and after consid[263]*263ering the evidence, Judge Petroni, without making a finding of fraud, concluded that the defendant had improperly determined his tax exemptions, resulting in a lesser amount of child support due for the four minor children.6 The court therefore modified the award so that it complied with the standard established by the [264]*264child support guidelines. We conclude that the court acted within its discretion in so ordering.
“Courts have intrinsic powers, independent of statutory provisions authorizing the opening of judgments, to vacate any judgment obtained by fraud, duress or mutual mistake.” In re Baby Girl B., 224 Conn. 263, 283, 618 A.2d 1 (1992). In the present case, we conclude that Judge Petroni properly vacated Judge Moran’s decision on the ground of mutual mistake.7
“The support guidelines create a rebuttable presumption that the amount of support calculated thereunder is the appropriate amount of support to be ordered by the court. General Statutes § 46b-215b. This presumption can be rebutted only if the trial court finds, on the record, that it would be inequitable or inappropriate to apply the guidelines because of evidence satisfying one of the guidelines deviation criteria.” Feliciano v. Feliciano, 37 Conn. App. 856, 858-59, 658 A.2d 141, cert. granted, 234 Conn. 915, 661 A.2d 96 (1995); see Favrow v. Vargas, 222 Conn. 699, 712-13, 610 A.2d 1267 (1992).
At oral argument before this court, the defendant conceded that, taking judicial notice of the child support guidelines in effect at the time, and using the defendant’s affidavit submitted to the court for the May 12,1993 hearing, the appropriate amount of child support equals $652. This is the amount that Judge Petroni ordered so as to correct what he considered the defendant’s improper conduct in claiming his tax exemptions. The record supports the conclusion that Judge Petroni found that a mutual mistake had been committed in the prior financial orders entered by Judge Moran due to the format of the defendant’s affidavit. [265]*265The record further supports the conclusion that Judge Petroni corrected the parties’ mutual mistake and increased the defendant’s required payments to comply with the standard required by the child support guidelines. Considering the policy of the child support guidelines, we conclude that Judge Petroni properly corrected the mathematical error in Judge Moran’s decision and properly increased the defendant’s support obligation.
II
The defendant next argues that Judge Petroni lacked the authority, pursuant to § 46b-86, to modify retroactively Judge Moran’s order concerning support payments. We conclude, however, that the trial court did not retroactively modify the support order and, therefore, we disagree with the defendant’s argument.
We agree with the defendant that retroactive modification of a support order is prohibited. See Sanchione v. Sanchione, 173 Conn.
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LAVERY, J.
The defendant appeals from the trial court’s decision granting the plaintiffs motion to modify an order of child support. On appeal, the defendant argues that the trial court improperly (1) increased his child support obligation in response to the plaintiffs motion, (2) retroactively modified a prior judge’s order concerning child support payments, and (3) proceeded with the hearing on the plaintiffs motion in the absence of sworn affidavits from both parties. We disagree with the defendant’s arguments and affirm the judgment of the trial court.
The record reveals the following facts. On June 4, 1991, the plaintiff brought this action seeking the dissolution of her fifteen year marriage to the defendant. The trial in this matter was held on March 10, 1992, and by decision dated March 18, 1992, the trial court, Karazin, J., rendered judgment dissolving the parties’ marriage. At the time of the dissolution, the trial court ordered, inter alia, the continuation of a prior order of unallocated alimony and child support of $250 per week.
On May 12, 1993, the parties appeared in court on the plaintiffs motion for emergency financial relief. After a hearing on the motion, the trial court, Moran, J., ordered the defendant to pay $595 per week to the [260]*260plaintiff as child support effective as of that date. On June 8, 1993, Judge Moran entered further orders continuing the child support at $595 per week and modifying the alimony award to $365 per week, effective immediately.
The plaintiff subsequently filed a motion to modify the child support, dated September 14, 1993, which is the subject of this appeal. In that motion, the plaintiff requested that her award of child support be increased to $652 per week because the defendant had “consistently and substantially understated his net monthly income and overstated his federal tax withholding for the purpose of defrauding his children of the support to which they are entitled under the Child Support Guidelines.”1 A hearing was held on the motion on November 17, 1993. At the conclusion of this hearing, the trial court, Petroni, J., ordered that for the fourteen [261]*261week period between the date of Judge Moran’s order, May 12, 1993, through August 31, 1993, the defendant was required, pursuant to the child support guidelines, to pay child support in the amount of $652 rather than the $595 that originally had been ordered. The trial court therefore ordered that the difference of $57 be paid and added to the defendant’s support obligation. The trial court further ordered, on the basis of the documentation submitted at the hearing, that as of the date of the modification hearing, the defendant’s child support obligation be increased to $670 per week.
I
The defendant first argues that the trial court improperly increased his child support obligation in response to the plaintiffs motion to modify. Specifically, the defendant argues that neither the motion to modify nor the trial court’s decision was based on the criteria for modification set forth in General Statutes § 46b-86,2 namely, a substantial change of circumstances or a deviation from the child support guidelines. According to the defendant, if there was an error in Judge Moran’s [262]*262support order, the plaintiff should have filed a motion to open the judgment within four months of the date of the judgment.3 Since the plaintiff did not do this, the defendant argues that the plaintiff was required to prove fraud in order to justify opening the judgment. Because the court did not make a finding of fraud, the defendant therefore argues that it had no authority to modify the support order since the motion was filed more than four months after the date of Judge Moran’s order.4 We disagree with the defendant’s arguments.
The plaintiffs motion to modify alleged that the defendant’s sworn statements concerning his alleged federal tax withholding were false. At oral argument on the motion, the plaintiff stated that she was alleging fraud.5 After the hearing on the motion, and after consid[263]*263ering the evidence, Judge Petroni, without making a finding of fraud, concluded that the defendant had improperly determined his tax exemptions, resulting in a lesser amount of child support due for the four minor children.6 The court therefore modified the award so that it complied with the standard established by the [264]*264child support guidelines. We conclude that the court acted within its discretion in so ordering.
“Courts have intrinsic powers, independent of statutory provisions authorizing the opening of judgments, to vacate any judgment obtained by fraud, duress or mutual mistake.” In re Baby Girl B., 224 Conn. 263, 283, 618 A.2d 1 (1992). In the present case, we conclude that Judge Petroni properly vacated Judge Moran’s decision on the ground of mutual mistake.7
“The support guidelines create a rebuttable presumption that the amount of support calculated thereunder is the appropriate amount of support to be ordered by the court. General Statutes § 46b-215b. This presumption can be rebutted only if the trial court finds, on the record, that it would be inequitable or inappropriate to apply the guidelines because of evidence satisfying one of the guidelines deviation criteria.” Feliciano v. Feliciano, 37 Conn. App. 856, 858-59, 658 A.2d 141, cert. granted, 234 Conn. 915, 661 A.2d 96 (1995); see Favrow v. Vargas, 222 Conn. 699, 712-13, 610 A.2d 1267 (1992).
At oral argument before this court, the defendant conceded that, taking judicial notice of the child support guidelines in effect at the time, and using the defendant’s affidavit submitted to the court for the May 12,1993 hearing, the appropriate amount of child support equals $652. This is the amount that Judge Petroni ordered so as to correct what he considered the defendant’s improper conduct in claiming his tax exemptions. The record supports the conclusion that Judge Petroni found that a mutual mistake had been committed in the prior financial orders entered by Judge Moran due to the format of the defendant’s affidavit. [265]*265The record further supports the conclusion that Judge Petroni corrected the parties’ mutual mistake and increased the defendant’s required payments to comply with the standard required by the child support guidelines. Considering the policy of the child support guidelines, we conclude that Judge Petroni properly corrected the mathematical error in Judge Moran’s decision and properly increased the defendant’s support obligation.
II
The defendant next argues that Judge Petroni lacked the authority, pursuant to § 46b-86, to modify retroactively Judge Moran’s order concerning support payments. We conclude, however, that the trial court did not retroactively modify the support order and, therefore, we disagree with the defendant’s argument.
We agree with the defendant that retroactive modification of a support order is prohibited. See Sanchione v. Sanchione, 173 Conn. 397, 406, 378 A.2d 522 (1977). We previously concluded, however, that Judge Petroni acted within his discretion in correcting the parties’ mutual mistake in the support order based on the incorrect information submitted by the defendant at the May 12, 1993 hearing. The court, upon discovering the mistake, entered the order that was mandated by the child support guidelines effective as of the date of the original order. We conclude that this correction does not amount to a retroactive modification of the support order.
Judge Petroni further ordered a prospective modification of the defendant’s support obligation to $670 per week based on evidence that his weekly salary had increased from $1370 to $1430. This order likewise does not violate the prohibition against retroactive modification of a support order.
[266]*266III
The defendant next argues that the trial court improperly proceeded with a hearing on the plaintiffs motion in the absence of sworn financial affidavits from both parties pursuant to Practice Book § 463.8 The plaintiff argues in response that the purpose of her motion was not to effect a change in circumstances but rather was intended to conform the support order to the true income of the defendant. She therefore argues that the trial court acted within its discretion in not requiring her to file a new financial affidavit. We agree with the plaintiff.
In Glinski v. Glinski, 26 Conn. App. 617, 623, 602 A.2d 1070 (1992), we noted that “§ 463 specifically allows a court to render permanent financial orders in the absence of the opposing party’s financial affidavit. See Sachs v. Sachs, 22 Conn. App. 410, 419, 578 A.2d 649, cert. denied, 216 Conn. 815, 580 A.2d 60 (1990).” We conclude, in the circumstances of this case, that it was not an abuse of discretion for the trial court to consider the plaintiff’s motion based on the documentation that was already before the court.
The judgment is affirmed.
In this opinion the other judges concurred.