ER 1.5. Fees
(a) A lawyer shall not make an agreement for, charge, or collect an unreasonable fee or an unreasonable amount for expenses. The factors to be considered in determining the reasonableness of a fee include the following:
(1) the time and labor required, the novelty and difficulty of the questions involved, and the skill requisite to perform the legal service properly
(2) the likelihood, if apparent to the client, that the acceptance of the particular employment will preclude other employment by the lawyer
(3) the fee customarily charged in the locality for similar legal services
(4) the amount involved and the results obtained
(5) the time limitations imposed by the client or by the circumstances
(6) the nature and length of the professional relationship with the client
(7) the experience, reputation, and ability of the lawyer or lawyers performing the services and
(8) the degree of risk assumed by the lawyer.
(b) The scope of the representation and the basis or rate of the fee and expenses for
which the client will be responsible shall be communicated to the client in writing, before
or within a reasonable time after commencing the representation, except when the lawyer
will charge a regularly represented client on the same basis or rate. Any changes in the
basis or rate of the fee or expenses shall also be communicated in writing before the fees
or expenses to be billed at higher rates are actually incurred. The requirements of this
subsection shall not apply to:
(1) court-appointed lawyers who are paid by a court or other governmental
(2) lawyers who provide pro bono short-term limited legal services to a client
pursuant to ER 6.5.
(c) A fee may be contingent on the outcome of the matter for which the service is rendered, except in a matter in which a contingent fee is prohibited by paragraph (d) or other law. A contingent fee agreement shall be in a writing signed by the client and shall state the method by which the fee is to be determined, including the percentage or percentages that shall accrue to the lawyer in the event of settlement, trial or appeal, litigation and other expenses to be deducted from the recovery, and whether such expenses are to be deducted before or after the contingent fee is calculated. The agreement must clearly notify the client of any expenses for which the client will be liable whether or not the client is the prevailing party. Upon conclusion of a contingent fee matter, the lawyer shall provide the client with a written statement stating the outcome of the matter and, if there is a recovery, showing the remittance to the client and the method of its determination.
(d) A lawyer shall not enter into an arrangement for, charge, or collect:
(1) any fee in a domestic relations matter, the payment or amount of which is contingent upon the securing of a divorce or upon the amount of alimony or support, or property settlement in lieu thereof
(2) a contingent fee for representing a defendant in a criminal case or
(3) a fee denominated as "earned upon receipt," "nonrefundable" or in similar terms unless the client is simultaneously advised in writing that the client may nevertheless discharge the lawyer at any time and in that event may be entitled to a refund of all or part of the fee based upon the value of the representation pursuant to paragraph (a).
(e) A division of a fee between lawyers who are not in the same firm may be made only if:
(1) the division is in proportion to the services performed by each lawyer or each lawyer receiving any portion of the fee assumes joint responsibility for the representation;
(2) the client agrees, in a writing signed by the client, to the participation of all the lawyers involved and the division of fees and responsibilities between lawyers; and
(3) the total fee is reasonable.
Reasonableness of Fee and Expenses
 Paragraph (a) requires that lawyers charge fees that are reasonable under the circumstances. The factors specified in (1) through (8) are not exclusive. Nor will each factor be relevant in each instance. Paragraph (a) also requires that expenses for which the client will be charged must be reasonable. A lawyer may seek reimbursement for the cost of services performed in-house, such as copying, or for other expenses incurred in-house, such as telephone charges, either by charging a reasonable amount to which the client has agreed in advance or by charging an amount that reasonably reflects the cost incurred by the lawyer.
Basis or Rate of Fee
 When the lawyer has regularly represented a client, they ordinarily will have evolved an understanding concerning the basis or rate of the fee and the expenses for which the client will be responsible. When the scope of the representation changes, in a material way, the lawyer should notify the client about the changes in writing. In a new client-lawyer relationship, however, a written understanding as to fees and expenses must be promptly established. Generally, furnishing the client with a simple memorandum or copy of the lawyer's customary fee arrangements will suffice, provided that the writing states the general nature of the legal services to be provided, the basis, rate or total amount of the fee and whether and to what extent the client will be responsible for any costs, expenses or disbursements in the course of the representation. A written statement concerning the terms of the engagement reduces the possibility of misunderstanding.
 Contingent fees, like any other fees, are subject to the reasonableness standard of paragraph (a) of this Rule, including consideration of the degree of risk assumed by the lawyer at the outset of the representation. In determining whether a particular contingent fee is reasonable, or whether it is reasonable to charge any form of contingent fee, a lawyer must consider all of the factors that are relevant under the circumstances. Applicable law may impose limitations on contingent fees, such as a ceiling on the percentage allowable, or may require a lawyer to offer clients an alternative basis for the fee. Applicable law also may apply to situations other than a contingent fee, for example, government regulations regarding fees in certain tax matters.
Terms of Payment
 A lawyer may require advance payment of a fee, but is obliged to return any unearned portion. See ER 1.16(d). A lawyer may accept property in payment for services, such as an ownership interest in an enterprise, providing this does not involve acquisition of a proprietary interest in the cause of action or subject matter of the litigation contrary to ER 1.8(i). However, a fee paid in property instead of money may be subject to the requirements of ER 1.8(a) because such fees often have the essential qualities of a business transaction with the client.
 An agreement may not be made whose terms might induce the lawyer improperly to curtail services for the client or perform them in a way contrary to the client's interest. For example, a lawyer should not enter into an agreement whereby services are to be provided only up to a stated amount when it is foreseeable that more extensive services probably will be required, unless the situation is adequately explained to the client. Otherwise, the client might have to bargain for further assistance in the midst of a proceeding or transaction. However, it is proper to define the extent of services in light of the client's ability to pay. A lawyer should not exploit a fee arrangement based primarily on hourly charges by using wasteful procedures. When there is doubt whether a contingent fee is consistent with the client's best interest, the lawyer should discuss with the client alternative bases for the fee and explain their implications.
Prohibited Contingent Fees
 Paragraph (d) prohibits a lawyer from charging a contingent fee in a domestic relations matter when payment is contingent upon the securing of a divorce or upon the amount of alimony or support or property settlement to be obtained. This provision does not preclude a contract for a contingent fee for legal representation in connection with the recovery of post-judgment balances due under support, alimony or other financial orders because such contracts do not implicate the same policy concerns.
Disclosure of Refund Rights for Certain Prepaid Fees
 Advance fee payments are of at least four types. The "true" or "classic" retainer is a fee paid in advance merely to insure the lawyer's availability to represent the client and to preclude the lawyer from taking adverse representation. What is often called a retainer but is in fact merely an advance fee deposit involves a security deposit to insure the payment of fees when they are subsequently earned, either on a flat fee or hourly fee basis. A flat fee is a fee of a set amount for performance of agreed work, which may or may not be paid in advance but is not deemed earned until the work is performed. A nonrefundable fee or an earned upon receipt fee is a flat fee paid in advance that is deemed earned upon payment regardless of the amount of future work performed. The agreement as to when a fee is earned affects whether it must be placed in the attorney's trust account, see ER 1.15, and may have significance under other laws such as tax and bankruptcy. But the reasonableness requirement and application of the factors in paragraph (a) may mean that a client is entitled to a refund of an advance fee payment even though it has been denominated "nonrefundable," "earned upon receipt" or in similar terms that imply the client would never become entitled to a refund. So that a client is not misled by the use of such terms, paragraph (d)(3) requires certain minimum disclosures that must be included in the written fee agreement. This does not mean the client will always be entitled to a refund upon early termination of the representation (e.g., factor (a)(2) might justify the entire fee), nor does it determine how any refund should be calculated (e.g., hours worked times a reasonable hourly rate, quantum meruit, percentage of the work completed, etc.), but merely requires that the client be advised of the possibility of the entitlement to a refund based upon application of the factors set forth in paragraph (a). In order to be able to demonstrate the reasonableness of the fee in the event of early termination of the representation, it would be advisable for lawyers to maintain contemporaneous time records for all representations undertaken on any flat fee basis.
Division of Fee
 A division of fee is a single billing to a client covering the fee of two or more lawyers who are not in the same firm. A division of fee facilitates association of more than one lawyer in a matter in which neither alone could serve the client as well, and most often is used when the fee is contingent and the division is between a referring lawyer and a trial specialist. Paragraph (e) permits the lawyers to divide a fee by agreement between the participating lawyers if the division is in proportion to the services performed by each lawyer or all lawyer assume joint responsibility for the representation and the client agrees, in a writing signed by the client, to the arrangement. A lawyer should only refer a matter to a lawyer who the referring lawyer reasonably believes is competent to handle the matter and any division of responsibility among lawyers working jointly on a matter should be reasonable in light of the client's need that the entire representation be completely and diligently completed. See ERs 1.1, 1.3. If the referring lawyer knows that the lawyer to whom the matter was referred has engaged in a violation of these Rules, the referring lawyer should take appropriate steps to protect the interests of the client. Except as permitted by this Rule, referral fees are prohibited by ER 7.2(b).
 Paragraph (e) does not prohibit or regulate division of fees to be received in the future for work done when lawyers were previously associated in a law firm.
Disputes Over Fees
 The State Bar of Arizona has established an arbitration procedure for the resolution of fee disputes. Each lawyer should conscientiously consider submitting to it. Law may prescribe a procedure for determining a lawyer's fee, for example, in representation of an executor or administrator, a class or a person entitled to a reasonable fee as part of the measure of damages. The lawyer entitled to such a fee and a lawyer representing another party concerned with the fee should comply with the prescribed procedure.