A flat fee is not a price for the case. It is a price for a described piece of the case, and the description lives in one or two paragraphs near the top of the agreement, usually under a heading like Scope of Representation. Everything that follows in the document, the trigger clauses, the refund language, the costs provision, exists to handle what happens when the case leaves that description. A careful reader spends most of their time on those four places, in that order, and asks the lawyer to say out loud what each one means in the particular case being charged.
The scope clause, and what the phrase "through disposition" is doing
Scope clauses tend to be written in stages rather than in tasks. A common formulation covers representation in a named court, on a named charge or case number, through arraignment, pretrial settings, motions and resolution by plea or dismissal. That phrasing is doing real work: it ends the flat fee at the point the case would otherwise become a trial. Ask which settings are inside the fee, whether a preliminary hearing or probable cause hearing counts, whether a suppression hearing counts, and whether the fee follows the case if the charge is refiled in a different court, say from municipal or district court up to the felony trial court after indictment. The answers should appear in the document, not only in conversation.
The second thing a careful reader checks in the scope clause is who the client is. Fee agreements name a single client, and if a spouse, parent or employer is paying, that person is a payor and not a client, which the agreement usually says in a separate paragraph about third-party payment and confidentiality. Where a co-defendant is involved, the agreement may address joint representation or, more often, explicitly disclaim it. Representing a second person on the same incident is a separate engagement at a separate fee, and it requires a conflicts analysis the lawyer has to do before taking the money.
The trigger clauses, which are where the second fee lives
Additional fee provisions are usually short and easy to skim past. The recurring triggers are trial, appeal, and post-judgment proceedings, and each one is priced separately, sometimes as a stated amount and sometimes as an amount to be agreed later. A trial fee typically becomes due at a defined moment, often when the case is set for trial or when jury selection begins, and the moment matters more than the number, because cases resolve on the courthouse steps often enough that the difference between "set for trial" and "trial begins" is real money. Probation violations, motions to revoke, bond revocation hearings and expunction petitions are ordinarily outside the original fee. So is a direct appeal, which is a different court and a different body of work.
Expert involvement is the trigger readers most often miss, because it sits in two places at once. Retaining a forensic accountant, a toxicologist, an accident reconstructionist or a mitigation specialist creates a cost the client pays directly, and it may also create additional attorney time that the agreement carves out of the flat fee. A clean agreement says who approves the expert, what the estimated range is, and whether the client's authorization is required in writing before the expense is incurred. That last sentence is worth insisting on.
Refundability, and the difference between earned and nonrefundable
State bar rules, not the lawyer, govern what can be called nonrefundable, and the modern trend in most jurisdictions is that a client may discharge counsel at any time and is entitled to the return of any portion of a fee that has not yet been earned. Agreements handle this in different ways. Some designate benchmarks, so that a stated percentage is earned on filing an appearance, another on completing discovery review, another on the first trial setting. Others simply say the fee is earned when paid, language many state bars now treat with suspicion. The useful question is procedural: if the case ends at the second setting, how is the refund calculated, and by when is it paid.
Costs, which are never the fee
Filing fees, investigator time, records and transcript orders, subpoena service, interpreter fees, travel, and expert retainers are ordinarily billed separately, at cost, and often require a deposit held in trust. Consumer contract practices of this kind fall within the general remit of the Federal Trade Commission, though the operative rules here are the state bar's. Ask for the costs paragraph to name a threshold above which your written approval is required, and ask how trust account balances are accounted for and returned. A lawyer who has thought about the question will answer it in one paragraph and put that paragraph in the agreement.
The version of the document you sign should match the case you actually have: the right court, the right charge, the named settings, the named triggers. Get the amendments in writing before the first appearance, because that is when the terms are easiest to change and cheapest to clarify.