How to Review Time-and-Materials Versus Fixed-Price in a SOW

Hale, Ops at an 18-person UK product studio, is about to treat “T&M, there is no ceiling” as flexible and cheap because the AE promised they always finish the backlog. Finance wants one board number. Knowing how to review time-and-materials versus fixed-price in a sow is a 25-minute hunt: write who holds estimating risk, allow a fixed fee only against testable “done,” refuse open T&M without a named ceiling and stop-work, lock the rate card, then pick, cap, or walk.

September 2026. English law; exclusive courts of England and Wales. The packet — the exact file set that will be signed — is the MSA (master services agreement, the frame this SOW hangs on) plus this implementation SOW and the exhibit — the rate card attached to the SOW. Fees: “Services shall be provided on a time-and-materials basis at the rates set out in Exhibit B. There is no ceiling.”

Exhibit B: “Consultant — £950 per day.” Billing: “Time shall be billed in one-hour increments, rounded up.” AE Slack: “We’ll treat it like a fixed-price build — we always finish the backlog.” Friday is booked. Overtime 1.5× “as required” and expenses “as incurred” sit in the same paper.

A not-to-exceed is not a fixed price — and the AE’s “we always finish the backlog” is the sentence that never binds. Dezign Dia (14 September 2026): the vendor is not obliged to finish the backlog within a cap. FAR 16.601 (FAC 2026-01, effective 13 March 2026) requires a federal T&M ceiling the contractor exceeds at its own risk — US colour, not Hale’s statute. Launch Day (29 May 2026) cites a 20–40% risk margin as advisor opinion. Pay that premium for testable “done,” or keep T&M and write the cap.

Disclaimer: Checkory provides AI support, not legal advice. Consult a qualified lawyer for binding decisions.

What does time-and-materials versus fixed-price put on each side?

Who holds the overrun is the first sentence to write, not which model sounds cheaper. A true fixed price puts estimating risk on the vendor; time-and-materials puts it on the buyer. Hale’s Fees paragraph says T&M and “there is no ceiling,” so the overrun sits with the studio. Write vendor, buyer, or shared.

Do: log who holds estimating risk on this paper. Don’t: treat AE Slack as a transfer if the SOW still says T&M with no ceiling. FAR 16.202-1 colour: a firm-fixed-price puts maximum cost risk on the contractor. In practice, uncapped T&M leaves the overrun with Hale. Coderio (July 2026): commercial buyers should copy the federal ceiling and frequently do not.

When is a fixed price just change-order theatre?

Allow a fixed fee only if two independent engineers reading the spec would build materially the same thing. If “done” is “finish the backlog,” a lump sum buys change-order theatre instead of a finish date. Hale’s AE Slack is that backlog promise. Do not fix-price a moving list.

Do: demand written assumptions, exclusions, and a testable acceptance test. Don’t: accept a padded quote for a portal rebuild that has not had discovery. Dezign Dia: never fix-price a build without discovery. NetSuite mechanics: a requirement change on fixed becomes a change order. For example, Intertec (31 March 2026): on fixed, overruns hide in change orders; on T&M, they show on the invoice. They cite a 15–30% premium as vendor opinion.

How do you cap time-and-materials that has no ceiling?

Yes, if the paper says “there is no ceiling” and nothing else stops the clock. A not-to-exceed is a stop-work ceiling, not a promise to finish the backlog. Circle Hale’s sentence. Redline a named £ NTE covering labour and expenses, a spend-threshold notice, and stop-work until a written increase.

Do: write the £ cap, the notice %, and who must sign the increase. Don’t: trust “we always finish the backlog” to bind spend. FAR 52.232-7 colour: 85% / next-30-days notice; buyer need not pay, vendor need not continue, past the ceiling without a written increase — US colour, not England-and-Wales statute. LegalClarity (21 June 2026): commercial papers often borrow that structure. Put the ceiling here.

What belongs on the rate card besides a day rate?

A blended “Consultant — £950 per day” hides seniority swaps. One-hour rounding, 1.5× overtime “as required,” and expenses “as incurred” can move the number without a change order. Demand named labour categories, a smaller increment, an overtime gate, and a pre-approval £ for expenses.

Do: name roles with fully loaded rates; kill nearest-hour round-up; require advance overtime approval. Don’t: leave Exhibit B as one blended day-rate. LeanLaw colour (US professional-services billing, not a UK statutory increment): 6- or 15-minute steps. Hale’s nearest hour rounded up is the expensive miss. FAR 52.232-7 colour: overtime only if the schedule says so, and only with advance approval. Typical mistake: “reasonable expenses as incurred” with no £ gate.

Is this the whole SOW, the PSA, or the holdback?

This hunt is the commercial model on Fees and Exhibit B. It is not a tour of the whole statement of work, not the professional-services chassis, and not a percent held until a named event.

If the fight is the whole SOW wrapper, that is a different hunt: statement of work review checklist. If the fight is the PSA chassis — IP, key-person, termination-for-convenience plus WIP — that is a different hunt: professional services agreement review. If the fight is a percent held until a named event, that is a different hunt: milestone holdback and retention review. Stay on Fees and Exhibit B.

When to pick the model, cap it, or walk?

Pick the model that matches how much is knowable. Cap open T&M with a named £ NTE, a notice threshold, and stop-work. Walk Friday if “no ceiling,” “we always finish the backlog,” a blended Consultant, and unapproved 1.5× overtime remain as a package. That package is the pause sentence. Counsel — a qualified lawyer, not the chatbot — goes on it.

Success bar: name the model, who holds risk, whether done is testable, the £ NTE or “no ceiling”, and the rate-card holes — then point to one Friday-pause sentence. AE Slack is not that sentence if the paper still says no ceiling. Workflow: who holds risk → testable done or change-order theatre → NTE + stop-work (NTE ≠ fixed) → rate card → pick / cap / walk. Optional: upload the same PDF to document analysis for a first-pass — a machine extract of clauses before a human reads every page. A human still opens Fees and Exhibit B to verify every High flag — a severity-high extract a human still opens.