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A $325/mo client running 3 hours pays $108/hr — but only if the cleanup backlog billed separately, first.
Bookkeeping fails as hourly billing and works as retainers: the client who took 5 hours in month one takes 2.5 by month six, and hourly billing pays you less for getting good. A $325/month retainer on a 150-transaction client is $108/hr effective — and a 25-client practice at a $350 average is $105,000 a year. This calculator shows the effective hourly on each client, the practice-level wage, and the cleanup fee that backlog work must bill separately.
Bookkeepers use it before the proposal: the $325/mo client pays $108/hr effective at 3 hours — and the 6-month backlog is a $900 cleanup project, not a free month one.
Monthly retainers tiered by transaction volume: under 100 transactions ($250–350/mo), 100–300 ($350–600/mo), 300+ ($600+/mo). Volume predicts effort far better than the client's revenue does — a $2M services business with 80 transactions is less work than a $400k restaurant with 900. The tier boundary is the re-quote point at renewal. Why not hourly: your efficiency is your margin — month six of a client takes half the hours of month one, and hourly billing cuts your pay in half for mastering the account. Track minutes per client monthly anyway, because scope creep (new bank accounts, a second entity, more questions) silently drops effective hourly, and the time log is the evidence for the anniversary re-quote. Software is COGS: QBO/Xero subscriptions either flow through wholesale billing or are priced into the retainer.
Always — and before the retainer starts. A new client with a six-month backlog is not a $325/mo account; it is a $900 fixed-fee cleanup engagement (backlog months × roughly 2 hours per month × a cleanup rate of $75–100/hr) plus the ongoing retainer once the books are current. Bookkeepers who fold cleanup into "month one" work free for weeks and train the client that arrears are cheap. Quote cleanup fixed-fee from a diagnostic review (one paid hour to scope the mess — unreconciled accounts, uncategorized transactions, missing payroll entries), never hourly-estimated from the client's guess. The cleanup is also your best marketing: delivering reconciled, CPA-ready books from chaos is the reference story that wins the next three clients.
Payroll ($50–150/mo per client, mostly automated once configured), bill pay and invoicing, sales tax filing, 1099 season, and the year-end CPA package — each prices standalone on top of the retainer, and each deepens retention because switching costs compound. The niche premium is real: construction (job costing, WIP schedules), medical practices, and e-commerce (multi-channel payouts, inventory COGS) each pay 20–40% above general rates for a bookkeeper who already speaks that chart of accounts. Credentials justify the top of every range — CB or CPB certification and QuickBooks ProAdvisor status move you from price-shopped to referred. The growth ceiling: one bookkeeper tops out around 25–35 clients depending on complexity; past that you hire at $20–30/hr and the practice becomes margin × books — which is exactly when fixed-fee pricing pays double, because your hires' efficiency gains accrue to the firm, not to an hourly meter.