(a) Time of Offer. At any time more than 10 days before the trial begins, any party may serve upon an adverse party a written damages-only or total-obligation offer to allow judgment to be entered to the effect specified in the offer, or to settle the case on the terms specified in the offer.(b) Applicability of Rule. An offer does not have the consequences provided in Rules 68.02 and 68.03 unless it expressly refers to Rule 68.(c) Damages-only Offers. An offer made under this rule is a "damages-only" offer unless the offer expressly states that it is a "total-obligation" offer. A damages-only offer does not include then-accrued applicable prejudgment interest, costs and disbursements, or applicable attorney fees, all of which shall be added to the amount stated as provided in Rules 68.02(b)(2) and (c).(d) Total-obligation Offers. The amount stated in an offer that is expressly identified as a "total-obligation" offer includes then-accrued applicable prejudgment interest, costs and disbursements, and applicable attorney fees.(e) Offer Following Determination of Liability. When the liability of one party to another has been determined by verdict, order, or judgment, but the amount or extent of the liability remains to be determined by further proceedings, the party adjudged liable may make an offer of judgment, which shall have the same effect as an offer made before trial if it is served within a reasonable time not less than 10 days before the commencement of a hearing or trial to determine the amount or extent of liability.(f) Filing. Notwithstanding the provisions of Rule 5.04, no offer under this rule need be filed with the court unless the offer is accepted.