Most comparisons of day rate versus fixed price focus on which one makes more money on average. That's a real question, but it skips a more practical one: which structure actually lets you see, while the job's still running, whether it's heading somewhere good or bad — because a pricing model that only reveals the truth at the final invoice isn't much use for actually managing a job.
Fixed price: tracking matters more, not less
On a fixed-price job, the number you invoice doesn't move regardless of what happens — which is exactly why tracking actual cost against that fixed number matters so much. Without it, you genuinely don't know if a fixed-price job made money until every cost has landed and been totalled. A fixed-price job with no running cost visibility isn't simpler to manage than a day-rate one — it's just simpler to invoice, while being harder to actually understand.
Day rate: tracking is baked into the invoice, but margin still isn't visible
Day-rate and time-and-materials jobs have an advantage: the invoice largely writes itself from the hours and materials logged, so under-tracking shows up immediately as a thinner invoice rather than a hidden loss discovered later. The trade-off is that day-rate tracking tells you what you billed, not whether the job was actually efficient — a job that ran long on hours still gets paid for those hours, so the incentive to track cost efficiency (not just cost recovery) is weaker unless you deliberately compare estimated hours to actual ones.
The real difference: what tracking is protecting you from
| Fixed price | Day rate / T&M | |
|---|---|---|
| What tracking reveals | Whether the fixed number still covers actual cost | Whether the job's taking longer than it should, even though it's still billable |
| Risk if you don't track | A loss discovered only at the final invoice | Inefficiency that's invisible because it's still getting paid |
| What "on track" looks like | Running cost staying under the quoted number | Hours and materials staying close to the original estimate given to the client |
Mixed structures need the most discipline
A lot of real jobs are neither purely one nor the other — a fixed price for the bulk of the work with a day-rate or "if we find X" clause for uncertain elements. These need job-level tracking the most, because the fixed and variable portions have to be watched separately: the fixed part needs cost discipline to protect margin, the variable part needs honest hour-and-material logging to justify the invoice if the client ever questions it.
How Site Wallet handles either structure
Every receipt and cost tagged to a job builds a running total regardless of how the job's priced — so whether it's fixed, day-rate, or a mix of both, the same habit of scanning as you go gives you the number that actually matters: what's this job cost so far, against what it was supposed to cost or bill.
FAQ
Which pricing model is generally more profitable?
It depends heavily on the trade and the job's certainty — fixed price rewards efficiency and punishes underestimating, day rate protects against underestimating but caps the upside on a job that goes smoothly. Tracking matters for both, just for different reasons.
Should I switch entirely to one or the other?
Most tradesmen and contractors end up using both, matched to the job — fixed price for well-understood work, day rate or a hybrid for anything genuinely uncertain.
Does tracking change which model I should choose for a specific job?
Yes, indirectly — once you can see real cost data from past jobs, you'll have a much better sense of which jobs are safe to fix-price and which ones are risky enough to protect with a day rate or contingency clause.