What one day a week actually costs you

Ask a fractional exec what they charge and they’ll give you a number fast: a day rate, a monthly retainer, a fee per engagement. Ask what they’re actually earning per hour on that engagement, once you count the Slack messages, the “quick calls” that run forty minutes over, and the deck you rebuilt the night before the board meeting, and most people go quiet. Not because they don’t care, but because nobody is tracking it.

That second number, the effective rate, is more useful than the first one for almost every decision that matters: whether to renew, whether to renegotiate, whether to walk.

Why the headline rate lies to you

A day rate is a promise about scope, not a measurement of reality. When you quoted “one day a week” for a client, you had a mental model of what that day contained: a few hours of strategic input, some review, maybe a standing meeting. Six months later, the standing meeting has become two standing meetings, the review now includes a Slack channel you’re expected to monitor between sessions, and there’s a WhatsApp thread for “urgent” questions that always seem to land on your day off.

None of this happened through a single bad decision. It happened through a dozen reasonable-sounding ones, each easy to say yes to in isolation. The day rate never changed. The day did.

The number that tells the truth

Effective rate is simple to define and slightly uncomfortable to calculate: total income from a client, divided by the actual hours it took to earn it, over a meaningful period. Not the hours you planned. The hours you logged.

The reason this is uncomfortable is that it’s the first honest comparison between what you’re paid and what you’re giving. A £2,000/week retainer that quietly consumes 25 hours is earning you £80/hour. The same retainer at 10 hours is £200/hour. Both are “the same client, the same fee.” They are not remotely the same deal.

Once you have this number per client, the next question answers itself: is this retainer still worth what I’m charging, compared to what I’m earning elsewhere in my own portfolio? A client running meaningfully below your portfolio average isn’t automatically a client to drop, sometimes there’s a strategic reason to keep it, but it is a client to have a conversation with. Without the number, you’re negotiating on a feeling. With it, you’re negotiating on a fact.

Why this only works if you track time on flat-fee work

The objection here is obvious: “I’m not billing by the hour, why would I track hours?” Because the fee is fixed but the hours behind it are not, and the effective rate is the only lens that shows you the difference. This is covered in more detail in tracking time when you don’t bill by the hour, but the short version is: tracking time on a retainer isn’t a step toward billing hourly. It’s how you find out whether flat-fee is still working in your favour.

What to do with the number once you have it

Three things, roughly in order of how often they come up:

Renegotiate before you resent it. A retainer running 20% below your portfolio average is not a crisis. Left alone for a year, it is. Raise it while it’s still a normal conversation, not an ultimatum.

Decide what “in scope” actually means, out loud. Most scope creep isn’t a client being unreasonable, it’s a client who never had scope defined clearly enough to know they were asking for more. Retainer burn-down that’s visible in real time turns “am I giving this client more than I sold them?” from a nagging suspicion into a specific, answerable question.

Let it inform who you take on next. Once you know your real portfolio average, you have a benchmark for every new opportunity. A tempting-sounding day rate that implies an effective rate below what you’re already earning is not a step up, whatever the headline number suggests.

The mechanism is a timer. The product is this number.

None of this requires elaborate reporting. It requires a timer you actually use and something that turns the hours into the figure that matters, automatically, per client, without a spreadsheet. That’s the entire reason time tracking exists in Quivva: not to produce a timesheet nobody reads, but to answer the one question that decides whether a retainer is still worth having.