Recovering time-and-materials fees: records, approval and due date

Open time-and-materials fees can be recovered when the order, actual working time, materials, price and due date fit together. A time sheet alone does not answer all of these questions.

With this billing model, decisions about additional work are often made while a project is in progress. Timely work records, understandable approvals and a clear link to the order therefore matter greatly.

This article deals only with open work-fee parts from time-and-materials work. Fixed prices, contractual penalties, pure services without a work result and ordinary sales follow different checks.

Clarify the time-and-materials agreement first

Time-and-materials fees require an agreement on that billing method. The basis may be the work contract, a variation, an offer, a purchase order or a later arrangement. The key questions are whether the parties intended billing by actual effort and which work the agreement covers.

The agreement should show whether labour, materials, equipment, travel time or subcontracted work are charged separately. If the written rule is incomplete, the communications and conduct of both parties require closer review. A client who specifically orders additional work and follows its performance provides useful evidence, but that does not replace a complete legal assessment.

For construction or repair work, distinguish between time billing agreed from the beginning and work added during performance. A contractor generally cannot unilaterally turn a fixed price into an hourly invoice. The additional effort must be linked to a separate order or an effective contractual variation.

Work records must explain time and performance

A useful work record states the date, people involved, precise task, place, duration and, where relevant, materials used. The description should allow the client to compare each item with the project progress and the order given.

Entries such as “work on site” provide little help in a substantial dispute. A better record links the time to a work stage, such as dismantling a particular component, troubleshooting a system or carrying out a specifically ordered variation. Photos, delivery notes, plans, emails and calendar data can support the records.

Signatures or digital approvals strengthen the evidence. They do not automatically mean that every item has been accepted on its merits. It matters who signed, what was explained at the time and whether that person was responsible for billing or only for confirming attendance. Conversely, the absence of a signature can sometimes be balanced by other timely evidence if the sequence remains coherent.

Assess approval and objections separately

Many work contracts require records to be presented weekly or monthly for review. Whether approval is a payment condition, a control step or an aid to proof depends on the contract. A regular signing practice should not automatically be treated as a waiver of every later objection.

If the client disputes individual hours, separate the invoice into undisputed and disputed items. A general statement that the invoice is too expensive is less precise than saying that a person was not on site on a particular day or that the work was included in the fixed price.

Alleged defects also change the review. They concern the quality of the result and must be distinguished from whether time was spent. Both questions may still be connected for enforcement, for example where completion, rectification or acceptance is a condition of the agreed billing.

Make pricing and cost estimates traceable

The invoice should show the agreed hourly rate and the units actually charged. Labour, materials and other items should be listed separately. If different people work at different rates, each group needs a clear allocation.

A cost estimate and a time-and-materials agreement serve different purposes. Section 1170a of the Austrian Civil Code may matter if a substantial overrun becomes apparent during performance. The review then includes when the client was informed and whether continuation or the additional cost was accepted.

A later invoice cannot replace a missing agreement on price or scope simply by adding more detail. At the same time, a deviation from an estimate does not automatically eliminate every fee claim. The type of contract, the binding force of the estimate, information about additional costs and the client response are decisive.

Review acceptance, completion and due date

Under section 1170 of the Austrian Civil Code, work fees are generally payable after completion of the work. For larger works or separate stages, instalments may be agreed. The exact billing mechanism is therefore decisive. An ongoing project may provide for monthly invoices, while another contract requires acceptance of a work stage.

Acceptance, use and completion are different facts. Using part of a work can be an important indication of performance, but it does not replace every contractually required acceptance. Likewise, issuing an invoice alone does not prove that a partial work was completed or performed without defects.

The contract, invoice, receipt, performance stage and payment term must be read together when assessing due date. Only then can default and default interest be considered. In business transactions, sections 455 and 456 of the Austrian Commercial Code may matter, but the requirements differ by situation. A blanket interest claim should therefore be avoided.

Prepare the demand, default and limitation review

Before an attorney letter, the open amount should be derived from the individual records. A clear table with date, task, person, time, price, materials and payments helps limit the dispute to specific items. Unclear lump sums make a factual response more difficult.

The letter should identify the legal basis, work billed, open balance and requested payment. Where items are disputed, a separate presentation may help. A payment deadline creates clarity, but it does not replace reviewing due date or proving performance.

For older work-fee claims, section 1486 of the Austrian Civil Code may provide a three-year limitation framework where its requirements are met. The starting point, acknowledgements, partial payments and court proceedings may affect the assessment. A mere reminder should not be treated as a safe interruption. Review due date and limitation risk early.

Which documents make the claim persuasive

For the first review, provide the original work contract, offers, variations and written additional orders in full. Add records with approvals, the invoice, payment history and all relevant communications. Isolated messages can create a misleading picture of the project.

For technical work, plans, photographs, delivery notes, material receipts and acceptance records can be particularly useful. In an ongoing project, the sequence of order, performance, notice of additional costs, review and invoice should remain visible. This can also show whether an item was already included in an earlier invoice.

Common problems include time sheets reconstructed much later without links to calendars or sites, mixing fixed-price and time-and-materials items, and invoices that list only total hours. It is also unsafe to assume that a signature automatically proves the whole work fee. Each item should be explained without overwhelming the client with an unstructured file.

Recovering time-and-materials fees: key questions