Job costing and finance

How to track time and materials work accurately

Accurate time and materials tracking needs four things: rates and markups agreed in writing before work starts, a daily ticket signed by the customer's representative, receipts behind every material line, and billing often enough that nothing gets forgotten or disputed.

Strapped lumber, concrete blocks and a parked telehandler in a commercial construction staging area.
Material quantities, delivery timing and equipment availability shape the next phase of work. AI-generated illustration.

To track time and materials work accurately, agree on labor rates, equipment rates, and material markup in writing before anyone picks up a tool, then fill out a T&M ticket every day that lists each worker, trade classification, hours, equipment hours, and materials used, and get it signed by the owner's or GC's representative that day. Keep every material receipt, code T&M work to its own cost codes, and bill weekly or at least every pay period. Unsigned tickets and missing receipts are where T&M money disappears.

T&M looks like the safest kind of work because the customer pays for whatever it takes. In practice it is where many contractors leave the most money on the table: hours that never made it onto a ticket, a pallet of block pulled from stock with no paperwork, a ticket signed three weeks later by someone who no longer remembers the work.

How T&M pricing is usually structured

The federal definition is a good model even for private work. Under FAR 16.601, a time-and-materials contract pays for direct labor hours at fixed hourly rates that include wages, overhead, general and administrative expenses, and profit, and pays for materials at actual cost. The same rule says T&M may be used only when it is not possible to estimate the extent or duration of the work accurately at the time of contracting, and it requires a ceiling price the contractor exceeds at its own risk. Private contracts vary, but most have the same three pieces: loaded labor rates, a material cost basis (often cost plus a markup), and a cap or not-to-exceed amount.

How to track T&M work, step by step

1. Get the rates and terms signed first

Before work starts, put in writing: hourly rate by classification (foreman, journeyman, apprentice, laborer), overtime rates, equipment rates, material markup, small tools and consumables treatment, who can sign tickets, and any not-to-exceed amount. If the T&M work is a change to an existing contract, issue it as a change order or written directive that references these rates.

2. Fill out a ticket every day

One ticket per day per T&M scope. List names, classifications, start and stop times, equipment and hours, and materials with quantities. Describe the work in plain words ("removed and replaced 40 LF of damaged curb at north drive") so someone reading it in a month knows what happened.

3. Get it signed the same day

A signature on the day of the work is the strongest proof you have. If the owner's rep refuses to sign, note that on the ticket, photograph the work, and send the ticket by email that day. Waiting until the end of the month invites disputes.

4. Back every material line with a receipt

Attach supplier invoices or delivery tickets. For material pulled from your own stock, use a stock issue slip with the item, quantity, and your cost. Many disputes on T&M bills are about materials, not labor.

5. Code T&M separately in job costing

Give each T&M scope its own cost code or job phase. Mixing T&M hours into the base contract codes hides overruns on the base work and makes it impossible to show the T&M cost if challenged. Timecards should carry the T&M code on every line where it applies. A construction timesheet template with a job and cost code column does this.

6. Bill often and track the cap

Bill T&M weekly or with each pay application, with copies of signed tickets and receipts attached. Keep a running total against any not-to-exceed amount and warn the customer in writing well before you reach it. Under the federal model, work above the ceiling is at the contractor's risk; private contracts often say something similar.

7. Review T&M margin when the scope closes

When the T&M scope is done, compare what you billed with what it actually cost in job costing. Loaded rates are supposed to recover wages, burden, overhead, and profit, but they only do that if every hour gets ticketed. If billed hours run well below payroll hours on the same cost code, crews are working time that never reaches a ticket. That gap is the clearest sign the tracking process needs fixing, and it is easy to measure once T&M has its own codes.

Worked example: one day of T&M

Say a site contractor is repairing a storm drain on T&M with a $25,000 not-to-exceed. Rates and markup below are illustrative, from the signed T&M agreement.

Example daily T&M ticket
ItemQuantityRateAmount
Journeyman pipe layer (2 workers)16 hours$95.00$1,520
Apprentice8 hours$62.00$496
Mini excavator6 hours$45.00$270
Pipe, fittings, and stone (supplier invoice)$1,240 cost15% markup$1,426
Day total$3,712

After four days the running total is $14,900, about 60 percent of the cap, and the superintendent thinks two more days will finish it. The PM sends a short note to the owner's rep with the running total and the forecast. If the work grows, the owner approves a higher cap before the crew passes $25,000, not after. Every day's ticket was signed the same afternoon, so the bill goes out Friday with no back and forth.

Mistakes that cost money on T&M

  1. Starting before rates are agreed. You then negotiate the rate after the work is done, from a weak position.
  2. Batch-signing tickets at month end. The signer cannot verify work they do not remember, so they cut it.
  3. Leaving out the foreman's time, trucks, and small tools. If the agreement allows them, ticket them.
  4. No receipts for stock material. Without a slip, it looks like a guess.
  5. Blowing through the cap. Work above an approved not-to-exceed amount is easy to dispute and hard to collect.

When T&M is the right contract type

T&M fits work that cannot be scoped before it starts: hidden damage, emergency repairs, investigative demolition, small service calls. It is a poor fit for work you could estimate, because the customer carries cost risk and will scrutinize every hour. Time and materials contracts: when to use them and cost-plus vs fixed-price contracts compare the options. For extra work requested in the field, see how to handle verbal change requests from owners.

Templates and terms

Smart Business Automator keeps change orders, daily log summaries, and invoicing on the same project, so signed T&M work moves from the field to an invoice without retyping. See change order approval automation.

Frequently asked questions

What should a T&M ticket include?

The date, job and location, a plain description of the work, each worker's name, classification, and hours, equipment and hours, materials with quantities, the agreed rates, and the signature and printed name of the customer's representative.

What do T&M labor rates include?

Usually wages, payroll burden, overhead, and profit rolled into one hourly rate per classification. The federal definition in FAR 16.601 describes rates that include wages, overhead, general and administrative expenses, and profit.

What happens if T&M work goes over the not-to-exceed amount?

It depends on the contract, but many caps say work above the limit is at the contractor's risk unless the customer approves an increase first. Track the running total and ask for an increase in writing before you reach the cap.

How often should T&M work be billed?

Weekly is best for active T&M scopes, or at least with every pay application. Frequent billing keeps tickets fresh and disputes small.

Sources

  1. Acquisition.gov: FAR 16.601 Time-and-materials contracts
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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