"At least with hourly billing, we know what we're paying for."
I've heard some version of that sentence from almost every managing partner or operations director I've worked with. It sounds reasonable. Prudent, even. And it's almost entirely wrong.
Not because the hours aren't real - they are. Not because agencies are padding timesheets - most aren't. The problem is that knowing what you're paying per hour tells you almost nothing about whether those hours are the most efficient path to what you actually need. You have cost transparency. What you don't have is value transparency. And those two things are so different it's a bit mad that we treat them as interchangeable.
What I want to do here is make the case that hourly billing creates a structural misalignment between what the agency is incentivised to do and what you want them to do. If you understand the mechanics of that misalignment, you're in a much stronger position to structure engagements that produce genuinely better results.
When you engage a digital partner on an hourly rate, you're choosing the commercial model that feels safest. And that feeling is precisely what makes it risky.
An agency billing by the hour has no financial incentive to find the most efficient solution. No incentive to reduce scope when scope reduction would actually get you to your outcome faster. No incentive to invest in reusable approaches or accelerators that would benefit you but reduce the hours required. Every efficiency they find is, structurally, money they leave on the table.
I want to be careful here - this isn't a claim that agencies on hourly billing are dishonest. The best ones behave well despite the model. I know several brilliant agencies that bill hourly and deliver outstanding work. But the incentive structure doesn't require them to. It rewards the opposite. And relying on goodwill rather than aligned incentives is not a commercial strategy - it's hope.
Think about it from the other side. If your revenue was directly tied to the number of hours your team logged against a client, what would your internal culture optimise for? Utilisation. Billable hours. Time spent. Not outcomes delivered, not problems solved efficiently, not "we found a way to do this in three days instead of ten." Even if you personally resisted that pull, every layer of your business would feel it.
I've watched this play out in practice. A few years back, we took over a project from another agency - a mid-sized professional services firm, about 150 people, had been working with them on hourly billing for the better part of a year. When we did our initial audit, we found a custom-built integration that had taken the previous agency around 60 hours to build. We'd solved the same problem for another client six months earlier using an off-the-shelf connector that took half a day to configure. The previous agency wasn't being malicious. They just had no reason to look for the faster route. Their model didn't reward it.
I get the appeal. Hourly billing feels like control. You can see the rate. You can see the hours. You can multiply them together and get a number. Arithmetic feels safe.
We've always done it this way. It's how professional services works. Fixed price just means the agency builds in a massive contingency and we end up paying more.
That objection is reasonable - I'll come back to it. But first, consider what hourly billing actually makes visible versus what it hides.
You know you're paying £150 an hour. What you don't know is whether the ten hours billed this week were the fastest route to your objective. You don't know whether a different approach would have taken five. You don't know whether the junior developer who took eight hours could have been replaced by a senior who'd have done it in three - at a higher rate that would have actually saved you money overall.
The transparency is real. The control it implies is an illusion.
I sat in a review meeting a while back with a mid-sized professional services firm - about 200 people, decent digital budget - that had been working with an agency on hourly billing for eighteen months. They'd spent north of £300k. The managing partner pulled up the invoices and said something like: "I can tell you exactly how many hours we've paid for. I cannot tell you what we've got for them." That's not an indictment of the agency. They'd done solid work. But the commercial model had made inputs visible and outcomes invisible, and over eighteen months that gap had become a chasm.
So if not hourly billing, then what? Most articles on this topic present one alternative as the universal answer. It isn't. Each model has legitimate applications and genuine limitations.
Fixed-price phases. The agency commits to delivering a defined scope for a defined price. This aligns incentives toward efficiency - the faster and smarter they deliver, the better their margin. It works brilliantly when the scope is well-defined upfront. It works badly when the project requires significant discovery or iteration, because it creates adversarial dynamics the moment anything changes. The client pushes for more. The agency pushes back. Every conversation becomes a negotiation about what's "in scope."
And yes - to address the objection directly - agencies do build contingency into fixed-price quotes. Of course they do. They'd be irresponsible not to. But here's the thing: that contingency is their problem, not yours. If they deliver efficiently, they keep the margin. If they don't, they absorb the cost. The risk sits with the party best positioned to manage it. That's actually how it should work.
Outcome-based engagement. The agency's fee is tied to a defined outcome rather than inputs. This produces the strongest incentive alignment - the agency only does well when you do well. But it requires the outcome to be genuinely measurable and the agency to have real influence over the variables that determine it. If you tie an agency's fee to lead conversion but your sales team takes three weeks to follow up on every enquiry, you've created a model that punishes the agency for something they can't control.
We've done outcome-based work at Distinction. It's brilliant when the conditions are right and genuinely uncomfortable when they're not. One engagement a few years ago - a SaaS business, conversion-focused rebuild - we tied a portion of our fee to a 30% uplift in trial sign-ups over 90 days. We hit it. But there was a moment around week six where the client wanted to change the homepage messaging in a way we thought would tank the numbers, and suddenly we were having a very different kind of conversation than we would have had on hourly billing. Not a bad conversation, actually. A more honest one. Both parties had skin in the game, which meant both parties had to actually engage with the decision.
Retainer with objectives. A monthly fee for a defined set of objectives rather than a defined set of hours. This maintains flexibility while creating accountability. It works best in ongoing relationships where trust is established and scope naturally evolves. It works poorly as a first engagement because neither party has enough information to set meaningful objectives. A retainer is earned, not proposed. If an agency suggests a retainer before they've delivered a single thing for you, that should give you pause.
The decision isn't philosophical. It depends on three things.
How well-defined is the scope? If you can describe exactly what you need built and the requirements are stable, fixed-price is appropriate. If the project requires discovery and iteration, forcing it into a fixed-price model will either produce a bloated quote or an adversarial relationship. For discovery-heavy work, a time-based model for the discovery phase followed by fixed-price delivery is often the most honest structure.
How measurable is the outcome? If you can define a specific, attributable result - "increase qualified enquiries by 40%" or "reduce portal support tickets by half" - outcome-based engagement is worth exploring. If the outcome is diffuse, long-term, or influenced by too many variables outside the agency's control, tying fees to it is unfair and unproductive.
What's the nature of the relationship? First engagement with a new partner? A fixed-price scoped phase is lower-risk for everyone. Established relationship with proven delivery? A retainer with objectives may produce the best ongoing value. The commercial model should mature as the relationship does.
A good agency proposes the commercial model that's best suited to the project and your situation, not the one that maximises their revenue certainty.
An agency that proposes hourly billing for a project with well-defined scope is not optimising for you. They're keeping the upside of efficiency while passing the risk of inefficiency to you. Equally, an agency that proposes fixed-price for a discovery project where the scope genuinely can't be known in advance is also not optimising for you - they're managing their own risk by building in enough contingency to cover the unknown, and you're paying for that comfort.
The test is simple: does the proposed commercial model make sense for this project, or is it just the agency's default? If every proposal from an agency uses the same commercial structure regardless of project type, that tells you something about how much thought they're putting into your specific situation.
I should be honest here. We've used hourly billing at Distinction. Sometimes procurement processes require it. Sometimes the project genuinely suits it - short, well-contained pieces of advisory work where the client wants to control exactly how much time is spent. But when we have the choice, we gravitate toward fixed-price phases or retainers with objectives, because we've seen - from both sides - how hourly billing can quietly erode the alignment that makes projects succeed.
That's not purity. It's pattern recognition from 25 years and 170-odd projects. The engagements where we've done our best work have almost always been the ones where our incentives and the client's incentives pointed in the same direction.
One thing I'd be dishonest not to mention: clients contribute to the problem too. Scope creep, delayed decisions, unclear briefs, stakeholders who disappear for three weeks then reappear with contradictory feedback - all of these things consume hours. Under hourly billing, they become visible as cost. Under fixed-price, they become visible as tension. Under any model, they make projects worse.
If you want your commercial model to work - whichever one you choose - you have to hold up your end. That means investing properly in the brief, making decisions within agreed timescales, and being honest about what you actually need rather than what sounds impressive in a steering committee. The best commercial model in the world can't compensate for a client who doesn't show up.
If you're about to commission a digital project - a replatform, a CX improvement programme, an AI pilot, whatever it is - don't default to hourly billing because it's familiar. Ask yourself the three questions: how defined is the scope, how measurable is the outcome, and how mature is the relationship? Then structure the engagement accordingly.
And if an agency pushes back when you propose a different model - if they insist on hourly billing when the project clearly suits a fixed-price approach - ask yourself why. The answer might be perfectly reasonable. Or it might tell you everything you need to know about whose interests that agency is optimising for.
We've put together a one-page commercial model assessment guide that maps the three main models against the key decision factors - scope definition, outcome measurability, relationship maturity, and risk tolerance. It's designed to be something you can share with your finance director or legal team before structuring the engagement. [Download the commercial model assessment guide.]
The goal isn't to eliminate hourly billing. It's to make sure you're choosing it deliberately, when it genuinely fits, rather than defaulting to it because it feels safe. That shift - from default to deliberate - is worth more than most people realise.