I have never billed a client by the hour. Every project I have shipped has been fixed price from the first conversation to the final deploy. This is not a marketing angle. It is a position I hold because hourly billing creates a structural conflict of interest between the developer and the client that no good intentions can fully overcome.
The Incentive Problem with Hourly Billing
Under hourly billing, the developer makes more money the longer the project takes. This is not a character flaw. It is just math. A developer billing $150/hour who takes 10 hours earns $1,500. The same developer who takes 20 hours earns $3,000. Even a developer with perfect integrity is going to be less aggressive about efficiency when every additional hour is additional revenue.
The result shows up in subtle ways. Exploratory work that could be timeboxed to two hours expands to four. A decision that could be made with a 15-minute call becomes a written proposal that takes an afternoon. Technical approaches that are slightly more complex but marginally better get chosen over simpler solutions that would ship faster. None of these are malicious. All of them are rational responses to the incentive structure.
Fixed pricing inverts this completely. Under fixed pricing, every hour I spend on a project is an hour I am not spending on the next one. The incentive is to build correctly and efficiently, not to maximize time on task. Scope creep hurts me, not the client. Inefficiency is my problem, not the client's.
Budget Certainty Is Not a Luxury
When a client hires a developer on an hourly basis, they have a budget estimate, not a budget. The developer might estimate 80 hours and deliver at 120. That 50% overrun is common, accepted as normal, and completely avoidable with proper scope definition upfront.
The clients who hire me are almost never large enterprises with flexible budgets. They are small businesses, content creators, and founders who have a specific amount of money allocated for a specific result. A 50% overrun does not mean they find 50% more budget. It means the project stops, relationships get strained, and the software ships half-finished or not at all. Fixed pricing is the only model that is compatible with how most clients actually plan their finances.
Scope Discipline as a Feature, Not a Constraint
The objection I hear most often to fixed pricing is that it requires rigid scope, and rigid scope stifles good software. This gets the causality backwards. Good software requires clear requirements. Hourly billing just lets you defer the work of defining those requirements until after the meter is running, which is the worst possible time to do it.
The one-page scope document I write before every MGT project is not a constraint. It is a forcing function that surfaces ambiguities before they become expensive. When I write "users can edit their profile including display name, email, and avatar" and the client says "wait, can they also change their password?" we have a 5-minute conversation and either add it to scope or note it as a phase 2 item. Under hourly billing, that conversation happens after I have already built the profile edit flow without password support, which means a change order, rework time, and a client who feels like they are being nickel-and-dimed.
What Happens When Scope Changes
Fixed pricing does not mean scope can never change. It means scope changes are explicit conversations, not invisible line items on an invoice. If a client asks for something outside the original scope document, I quote it as an add-on. Small things within the spirit of the original scope, I just build. Nobody is keeping a tally of every hour. The goal is to deliver what was agreed on, and reasonable people can agree on what "reasonable adjustments" means without a formal change order process.
The detailed breakdown of how MGT scoping and pricing actually works in practice is in the pricing post. The short version: fixed price, clear scope, revisions within scope included, no surprise invoices.
The Comparison That Matters
On a typical $20K project, hourly billing at $150/hour with a 133-hour estimate has a realistic range of $15K to $30K depending on how well scope was defined and how efficient the developer is. Fixed pricing at $20K means $20K. That predictability is worth something independent of whether the fixed price is higher or lower than the hourly estimate. Certainty has value. You can plan around a fixed number. You cannot plan around a range that spans 2x.
If you are currently evaluating developers or agencies for a project and comparing hourly quotes to fixed-price quotes, run both scenarios through the ROI calculator. Then get a fixed-price quote from the project estimator. If the numbers make sense, the contact page is the next step.