A client in a contested custody case signed an engagement letter in March, wired a retainer, and heard almost nothing for five weeks. Then the first statement arrived: four pages, roughly sixty line entries, each one a date, a set of initials, a decimal number, and a phrase like "review correspondence from opposing counsel; revise proposed parenting schedule." The balance remaining on the retainer was less than a third of what she had deposited. Nothing on the statement was improper. She simply had no way, reading it cold, to tell whether the work described was worth what it cost.
The three structures, and which cases they actually fit
Flat fees show up where the work is predictable: an uncontested dissolution with no minor children and no real property, a name change, a stipulated modification both parents have already agreed to in writing. The lawyer knows roughly how many hours the file will take, prices it accordingly, and absorbs the variance. Read the flat fee agreement for its exit ramp, because almost every one has a clause converting the matter to hourly billing if the other side files a response, if discovery opens, or if a hearing gets set. That conversion is the moment your budget changes, and it is worth asking, before you sign, what triggers it.
Retainer plus hourly is the default in anything contested. The retainer is not a fee. It is a deposit held in a client trust account, drawn down as work is performed and billed, and in most jurisdictions the unearned portion belongs to you and must be refunded if the engagement ends. Limited scope engagements sit between the two: the attorney handles one discrete piece, drafting a qualified domestic relations order, appearing at a single hearing, reviewing a settlement you negotiated yourself, and files a notice limiting the representation to that task. Courts in most states now permit this expressly.
What a replenishment clause obliges you to do
Somewhere in the engagement letter, usually in a paragraph headed evergreen retainer or minimum balance, sits language requiring you to restore the trust deposit whenever it falls below a stated floor. The careful reader checks three things in that paragraph: the floor amount, the number of days you have to replenish after notice, and what happens if you do not. The consequence is ordinarily a motion to withdraw. A judge may or may not grant it depending on how close trial is, but the request itself becomes part of the record and lands at the worst possible moment. Knowing the floor lets you plan cash flow around it rather than around a surprise letter.
The costs that sit outside the hourly rate
Fees buy the lawyer's time. Costs buy everything else, and in family law the everything else is substantial. Filing fees are set by the clerk and vary by county. Process servers charge per attempt, not per success, so an evasive spouse costs more. Certified copies, court reporters for depositions, transcript preparation, and subpoena fees are all pass-through items. The larger ones are the neutrals and experts: a custody evaluator appointed to interview both households and produce a written recommendation, a forensic accountant tracing separate property through a decade of commingled accounts, a vocational evaluator whose testimony bears on imputed income for support. These are billed at their own rates, often require their own deposits, and are frequently split between the parties by court order rather than paid by one side alone.
Auditing the statement line by line
Start with the increment. Most firms bill in tenths of an hour, six minutes, and a statement full of 0.3 entries for two-sentence emails is telling you something about how the file is being handled. Check that the initials on each line match the rate table, because paralegal time billed at an associate's rate is the most common error, and it is almost always a clerical one that gets corrected on request. Look for the same task appearing twice under different phrasings. Confirm that costs appear in a separate column from fees, and that the trust ledger shows a running balance, a beginning figure, disbursements, and an ending figure you can reconcile against last month's. Question anything within the billing period the agreement gives you, usually thirty days.
Making the arrangement work over the life of the case
The Federal Trade Commission oversees consumer billing practices broadly, but the operative rules here are state bar rules on trust accounting and fee agreements, and they are more protective than most clients realize. Ask for statements monthly even in a quiet month. Ask for an estimate before any step you have not budgeted, particularly an evaluator appointment or a deposition. Attorneys who bill hourly generally welcome the question, because a client who understands the cost of a motion is a client who chooses motions deliberately.