What Is Time-to-Cash? The Metric Professional Services Firms Should Manage
Time-to-cash is the elapsed time between a firm committing to a piece of work and receiving payment for it. It is broader than billing and broader than collections: it starts before the work begins, when the project is priced and budgeted, and it ends only when cash arrives. Every day work sits unpriced, unrecorded, unreviewed, or unpaid is value the firm has committed to, or already earned, but cannot yet use.
Most firms manage the pieces separately (pricing, entries, prebills, invoices, receivables) and nobody owns the whole path. Time-to-cash gives leadership one chain to manage end to end.
The full cycle: six stages, starting before the work
1. Model and price. Before signing, the firm estimates the project: which resource ranks will do the work, under what fee structure, with what expenses, against what realization and profit-margin targets. A project priced well starts its life with a budget and a revenue baseline. A project priced on instinct starts with a hole it may never climb out of.
2. Work performed. A lawyer advises, an accountant prepares a filing, a consultant runs a workshop. The value is created here, and most easily lost, because nothing has been recorded yet.
3. Time captured. The work becomes an entry: date, duration, matter, narrative. Captured in the moment, or reconstructed later from memory, with very different accuracy.
4. Prebill. Draft bills are assembled, reviewed, and edited through approval stages. Reviewers check narratives, adjust entries, and confirm the bill is defensible.
5. Invoice issued. The approved bill is finalised and sent. Only now does the client know what they owe; the payment clock starts when the invoice goes out, not before.
6. Payment received. The client pays and the money reaches the firm. That arrival, not the invoice date, is the true end of the cycle.
One cycle, two finishes
Stages 5 and 6 run differently depending on the firm, by design, not by compromise.
Smaller firms often run the whole cycle in one system. The approved prebill becomes an invoice in the same system that captured the time, and collections are tracked there until it’s paid, with nothing re-keyed or handed off between tools.
Firms with an established accounting system keep it. For them, Aprotime’s leverage sits in the stages before the invoice: capture and, above all, the pre-bill. Aprotime’s integration options connect the two, so approved work flows into the system that already issues their invoices, and invoicing and payment continue as they always have.
Firms finish the cycle where it suits them. The cycle is measured the same way either way, days and margin from commitment to cash, and the stages before the invoice are where most controllable delay sits.
Where delays and leakage occur
At the modelling stage, the leak is structural: fees set on last year’s rates, no realization target, and no margin check mean the firm can execute flawlessly and still lose money on the matter. Overruns are often priced in at signature, not created during delivery.
At capture, the problem is delay and omission. Time entered at week-end is reconstructed; small increments (the six-minute call, the quick review) are forgotten first, and remembered time is recorded too vaguely to survive review.
At prebill, drafts wait on busy reviewers and circulate by email, adding days even when capture was prompt. At invoice, month-end batching means finished work waits weeks before client payment terms even begin. At payment, the firm’s control is indirect but real: clear narratives reduce queries, accurate invoices reduce disputes, and aging visibility determines whether follow-up happens in days or drifts for weeks.
How to measure it
Measure the average days in each stage for a recent period: signing-to-start and budget accuracy at the modelling stage; work-to-entry; entry-to-prebill approval; approval-to-invoice; and invoice-to-payment (your days sales outstanding). Add the internal stages and you have the portion of time-to-cash your firm actually controls, which is usually larger, and more fixable, than the client’s payment behaviour.
Also track two quality measures alongside the days: realization (what you bill and collect against what you recorded, and against the targets set at pricing) and budget variance (actuals against the modelled baseline). A fast cycle that leaks margin is not a healthy one.
What “good” looks like
Projects are priced from evidence, modelled scenarios and historical actuals, with explicit realization and margin targets. Time is captured the same day. Prebills move through defined approval stages on a schedule. Invoices go out promptly, and leadership can see how much work sits in each stage and how live matters track against their budgets. No stage depends on heroics: a short time-to-cash is a property of the system.
How Aprotime supports the whole cycle
Aprotime is built for legal, accounting, and professional services firms across all six stages. Before signing, its scenario profitability modelling lets you simulate resource ranks, fee structures, and estimated expenses to calculate net profit margins, set realization targets and revenue baselines, and build budgets from the historical actuals of similar past projects. During delivery, live timers, manual entry, templates, and optional passive capture, with total user privacy control, record the work; AI-assisted narratives draft client-ready entry descriptions; and real-time budget limits and alerts warn before overruns happen. At billing, prebilling reviews with multi-stage approvals carry approved work forward, to an invoice generated and sent in Aprotime, with collections tracked there, or into your own accounting system through Aprotime’s integration options if that is where your firm invoices and collects. AI insights surface unbilled hours and trends for leadership throughout. Deployment is cloud, dedicated private hosting, or self-hosted.
Frequently asked questions
Is time-to-cash the same as days sales outstanding (DSO)?
No. DSO measures only the final stage: invoice sent to payment received. Time-to-cash starts earlier, at pricing and capture, and includes the internal stages DSO cannot see.
Why does pricing belong in a time-to-cash discussion?
Because a project priced below its realization and margin targets leaks value no billing process can recover. The cycle’s economics are set at signature; the later stages only protect or erode them.
Our firm already invoices from its own accounting system. Does the cycle still apply?
Yes. Firms with an established accounting system keep it; Aprotime’s integration options connect the two, so approved work flows into the system that already issues their invoices, and invoicing and payment continue as usual. Smaller firms often invoice and collect in the same system that captured the time. Either way, the stages before the invoice are where most controllable delay sits.
Which stage should we fix first?
The one holding the most days, or the most margin. For many firms that is capture delay, prebill review, or unmodelled pricing, all directly within the firm’s control.
How often should we measure it?
Monthly suits most firms. Track average days per stage plus realization and budget variance, so you can see which stage is improving or slipping.
Start where the cycle starts
If you cannot say how many days, or how much margin, sit between signing a project and being paid for it, start there. Aprotime is designed to manage the whole path, from the first estimate to final payment, whichever system your firm finishes it in. Schedule a demo and bring a recent project: we can walk it through every stage.
