OPINION
COMPTON, Justice.
This case raises questions concerning contribution among joint tortfeasors. The specific issue is when a claim for contribution arises.
I. FACTUAL AND PROCEDURAL BACKGROUND
An accident occurred involving vehicles driven by Robert McGee and Wayne Var-ney. McGee was driving a truck owned by his employer, Power Communications. He was returning home after picking up material for work the next day. Varney was driving a car also owned by his employer, James Turner, d/b/a J & O Drilling. Var-ney and four passengers were returning from an outing at the Fairbanks Fair. The car was insured under Turner’s policy with Providence Washington Insurance Company of Alaska (Providence Washington). Varney was an insured driver under the policy.
Providence Washington paid $36,894.76 to Lynn Ice, a passenger in the Turner car, for damages she sustained in the accident. In exchange, Providence Washington ob[713]*713tained from Ice the release of Varney, Turner, McGee and Power Communications from further liability. Providence Washington paid $6,269.00 to Turner for damages to his car.
Also as a result of the accident, McGee filed suit against Varney. That action was dismissed when Providence Washington agreed to pay McGee $275,000 on Varney’s behalf. In exchange, McGee released Var-ney, Turner, J & O Drilling and Providence Washington from future liability.1
Following its settlement of these claims, Providence Washington, as subrogee of Turner,2 filed suit against McGee and Power Communications (collectively McGee, unless otherwise noted) for contribution on the amounts paid to Ice and Turner.3 Providence Washington alleged that McGee was a joint tortfeasor on a theory of negligence, and Power Communications a joint tortfeasor on the theories of vicarious liability and negligent entrustment of its vehicle to McGee. McGee answered that Providence Washington was required under Alaska R.Civ.P. 13(a)4 to bring these claims in McGee’s previous action against Varney. Because the claims were not brought at that time, McGee claimed that they were barred.
This case was originally assigned to Judge Gerald J. Van Hoomissen. Judge Van Hoomissen denied McGee’s motion for judgment on the pleadings, but granted partial summary judgment to Power Communications on the claim of negligent en-[714]*714trustment. The case was reassigned to Judge James R. Blair. At a pretrial conference, McGee renewed his motion for judgment on the pleadings. The following day Judge Blair granted the motion, holding that the claims were barred under Civil Rule 13(a).5
Providence Washington appeals the rulings on the judgment on the pleadings, the summary judgment and attorney’s fees.
II. DISCUSSION
We have recognized that a complaint is subject to dismissal under Alaska R.Civ.P. 12(b)(6) when an affirmative defense appears clearly on the face of the pleading. Aspen Exploration Corp. v. Sheffield, 739 P.2d 150, 152 (Alaska 1987). We have also recognized that when a pleading is dismissed on the basis of an affirmative defense, “resolution of [the] case is not found within the confines of Rule 12(b)(6) but rather in an analysis of [the defense].” Id. The defense asserted by McGee is the compulsory counterclaim rule contained in Civil Rule 13(a). Analysis of Civil Rule 13(a) is a matter of law over which this court may exercise its independent judgment. Miller v. LHKM, 751 P.2d 1356, 1359 n. 5 (Alaska 1988).
A. THE TRIAL COURT ERRED IN DISMISSING PROVIDENCE WASHINGTON’S CLAIM ON THE BASIS OF CIVIL RULE 13(a).
Contribution is governed by the Alaska Uniform Contribution Among Tort-feasors Act (the Act), AS 09.16.010-.060. The Act creates a right to pro rata contribution between joint tortfeasors. AS 09.-16.010(a), (b). Insurers who pay to discharge the liability of a tortfeasor are sub-rogated to the tortfeasor’s right of contribution. AS 09.16.010(e). The Act also establishes a right to pro rata contribution among all parties released in a settlement agreement if an agreement is construed as a satisfaction of judgment which extinguishes the liability of other tortfeasors. Criterion Ins. Co. v. Laitala, 658 P.2d 112, 115-17 (Alaska 1983). Finally, the Act grants a procedural right to sue in a separate action before liability has been determined. AS 09.16.030(a).
McGee argues that Providence Washington may not bring the instant suit because any claim for contribution should have been brought in the previous action of McGee v. Varney, 4FA-83-298 Civil. He bases this claim on Civil Rule 13(a).
This argument fails because Civil Rule 13(a) only applies to claims which are mature at the time pleadings are served. See 3 J. Moore, Moore’s Federal Practice 1113.14[1], at 13-82-84 (2d ed. 1985). In the case at bar, the claim for contribution did not accrue until after the last pleading was filed in McGee v. Varney. On January 13, 1984, McGee filed an amended complaint which was answered on January 16. Ice did not settle her claim until June 20,1984.6 [715]*715At that time Providence Washington paid the total claim.
We agree with those courts that hold that a claim for contribution is substantively separate from the underlying tort and does not arise until the contribution claimant has paid more than his or her proportionate share of the total claim. See A Patient Care Center v. Ted Hoyer & Co., 498 So.2d 1381, 1382 (Fla.App.1986); State ex rel. General Elec. Co. v. Gaertner, 666 S.W.2d 764, 767 (Mo.1984); Markey v. Skog, 129 N.J.Super. 192, 322 A.2d 513, 517 (1974). The total amount of the liability to Ice first had to be established to determine proportions. That amount was not known until the June 20 settlement was reached. No cause of action for contribution accrued until it was determined that Providence Washington had paid one hundred percent of the settlement. Only at that time, assuming Providence Washington’s allegations of McGee’s negligence to be true, would Providence Washington have paid more than its proportionate share.7 See Criterion Ins. Co., 658 P.2d at 115-17; AS 09.16.010(b). Therefore, the claim for contribution could not have been a compulsory counterclaim until after June 20,8 which was well past the date that responsive pleadings were required,9 see Alaska R.Civ.P. 12(a), and as a result, the action is not now barred by Civil Rule 13(a).
B. THE TRIAL COURT DID NOT ERR IN GRANTING SUMMARY JUDGMENT TO POWER COMMUNICATIONS ON THE ISSUE OF NEGLIGENT ENTRUSTMENT.
In reviewing motions for summary judgment, this court may make an independent review to determine whether any issue of material fact remains to be litigated and whether any party is entitled to judgment on the relevant law.
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OPINION
COMPTON, Justice.
This case raises questions concerning contribution among joint tortfeasors. The specific issue is when a claim for contribution arises.
I. FACTUAL AND PROCEDURAL BACKGROUND
An accident occurred involving vehicles driven by Robert McGee and Wayne Var-ney. McGee was driving a truck owned by his employer, Power Communications. He was returning home after picking up material for work the next day. Varney was driving a car also owned by his employer, James Turner, d/b/a J & O Drilling. Var-ney and four passengers were returning from an outing at the Fairbanks Fair. The car was insured under Turner’s policy with Providence Washington Insurance Company of Alaska (Providence Washington). Varney was an insured driver under the policy.
Providence Washington paid $36,894.76 to Lynn Ice, a passenger in the Turner car, for damages she sustained in the accident. In exchange, Providence Washington ob[713]*713tained from Ice the release of Varney, Turner, McGee and Power Communications from further liability. Providence Washington paid $6,269.00 to Turner for damages to his car.
Also as a result of the accident, McGee filed suit against Varney. That action was dismissed when Providence Washington agreed to pay McGee $275,000 on Varney’s behalf. In exchange, McGee released Var-ney, Turner, J & O Drilling and Providence Washington from future liability.1
Following its settlement of these claims, Providence Washington, as subrogee of Turner,2 filed suit against McGee and Power Communications (collectively McGee, unless otherwise noted) for contribution on the amounts paid to Ice and Turner.3 Providence Washington alleged that McGee was a joint tortfeasor on a theory of negligence, and Power Communications a joint tortfeasor on the theories of vicarious liability and negligent entrustment of its vehicle to McGee. McGee answered that Providence Washington was required under Alaska R.Civ.P. 13(a)4 to bring these claims in McGee’s previous action against Varney. Because the claims were not brought at that time, McGee claimed that they were barred.
This case was originally assigned to Judge Gerald J. Van Hoomissen. Judge Van Hoomissen denied McGee’s motion for judgment on the pleadings, but granted partial summary judgment to Power Communications on the claim of negligent en-[714]*714trustment. The case was reassigned to Judge James R. Blair. At a pretrial conference, McGee renewed his motion for judgment on the pleadings. The following day Judge Blair granted the motion, holding that the claims were barred under Civil Rule 13(a).5
Providence Washington appeals the rulings on the judgment on the pleadings, the summary judgment and attorney’s fees.
II. DISCUSSION
We have recognized that a complaint is subject to dismissal under Alaska R.Civ.P. 12(b)(6) when an affirmative defense appears clearly on the face of the pleading. Aspen Exploration Corp. v. Sheffield, 739 P.2d 150, 152 (Alaska 1987). We have also recognized that when a pleading is dismissed on the basis of an affirmative defense, “resolution of [the] case is not found within the confines of Rule 12(b)(6) but rather in an analysis of [the defense].” Id. The defense asserted by McGee is the compulsory counterclaim rule contained in Civil Rule 13(a). Analysis of Civil Rule 13(a) is a matter of law over which this court may exercise its independent judgment. Miller v. LHKM, 751 P.2d 1356, 1359 n. 5 (Alaska 1988).
A. THE TRIAL COURT ERRED IN DISMISSING PROVIDENCE WASHINGTON’S CLAIM ON THE BASIS OF CIVIL RULE 13(a).
Contribution is governed by the Alaska Uniform Contribution Among Tort-feasors Act (the Act), AS 09.16.010-.060. The Act creates a right to pro rata contribution between joint tortfeasors. AS 09.-16.010(a), (b). Insurers who pay to discharge the liability of a tortfeasor are sub-rogated to the tortfeasor’s right of contribution. AS 09.16.010(e). The Act also establishes a right to pro rata contribution among all parties released in a settlement agreement if an agreement is construed as a satisfaction of judgment which extinguishes the liability of other tortfeasors. Criterion Ins. Co. v. Laitala, 658 P.2d 112, 115-17 (Alaska 1983). Finally, the Act grants a procedural right to sue in a separate action before liability has been determined. AS 09.16.030(a).
McGee argues that Providence Washington may not bring the instant suit because any claim for contribution should have been brought in the previous action of McGee v. Varney, 4FA-83-298 Civil. He bases this claim on Civil Rule 13(a).
This argument fails because Civil Rule 13(a) only applies to claims which are mature at the time pleadings are served. See 3 J. Moore, Moore’s Federal Practice 1113.14[1], at 13-82-84 (2d ed. 1985). In the case at bar, the claim for contribution did not accrue until after the last pleading was filed in McGee v. Varney. On January 13, 1984, McGee filed an amended complaint which was answered on January 16. Ice did not settle her claim until June 20,1984.6 [715]*715At that time Providence Washington paid the total claim.
We agree with those courts that hold that a claim for contribution is substantively separate from the underlying tort and does not arise until the contribution claimant has paid more than his or her proportionate share of the total claim. See A Patient Care Center v. Ted Hoyer & Co., 498 So.2d 1381, 1382 (Fla.App.1986); State ex rel. General Elec. Co. v. Gaertner, 666 S.W.2d 764, 767 (Mo.1984); Markey v. Skog, 129 N.J.Super. 192, 322 A.2d 513, 517 (1974). The total amount of the liability to Ice first had to be established to determine proportions. That amount was not known until the June 20 settlement was reached. No cause of action for contribution accrued until it was determined that Providence Washington had paid one hundred percent of the settlement. Only at that time, assuming Providence Washington’s allegations of McGee’s negligence to be true, would Providence Washington have paid more than its proportionate share.7 See Criterion Ins. Co., 658 P.2d at 115-17; AS 09.16.010(b). Therefore, the claim for contribution could not have been a compulsory counterclaim until after June 20,8 which was well past the date that responsive pleadings were required,9 see Alaska R.Civ.P. 12(a), and as a result, the action is not now barred by Civil Rule 13(a).
B. THE TRIAL COURT DID NOT ERR IN GRANTING SUMMARY JUDGMENT TO POWER COMMUNICATIONS ON THE ISSUE OF NEGLIGENT ENTRUSTMENT.
In reviewing motions for summary judgment, this court may make an independent review to determine whether any issue of material fact remains to be litigated and whether any party is entitled to judgment on the relevant law. Zeman v. Lufthansa German Airlines, 699 P.2d 1274, 1280 (Alaska 1985); Alaska Rent-A-Car v. Ford Motor Co., 526 P.2d 1136 (Alaska 1974).
Providence Washington based its claim of negligent entrustment on the following chain of allegations: “that McGee regularly drank alcoholic beverages, returned to work and drove the vehicle owned by Power Communications. Members of McGee’s crew were aware of these practices.” But these are merely allegations. Providence Washington did introduce evidence that McGee drank the night before the accident and twice on the date of the accident, but did not introduce evidence that McGee regularly drank. Nor, more importantly, did Providence Washington introduce evidence that McGee’s supervisors at Power Communications had any reason to suspect that McGee drove while intoxicated.
Power Communications introduced evidence refuting Providence Washington’s unsubstantiated allegations. John Teeter, a supervisor of McGee’s, stated: “Mr. McGee never appeared to me to have been drinking alcohol on any occasion, either before or during working hours or while operating company vehicles.” Teeter’s affidavit is the only admissible evidence on this issue. Providence Washington attacked Teeter’s. affidavit, arguing that it “does not establish that other employees, co-workers and/or supervisors at Power Communications were not aware of [716]*716McGee s negligent driving and drinking habits.” But Providence Washington’s allegations were unsupported by admissible evidence and as a result are inadequate to rebutt Power Communications’ evidence. Thus, Power Communications met its burden of showing that no material fact remained in dispute and was correctly granted summary judgment.
III. CONCLUSION
For the reasons stated above the trial court’s decision is AFFIRMED in part, REVERSED in part, and REMANDED.10