Invoicing and documents
Estimate
An estimate is an approximate calculation of the expected cost for a specific job or project, provided by a business to a potential client before work begins.
What is Estimate?
When you pitch a project where the exact costs are still unknown, you issue an estimate. It provides your client with a rough idea of what they might spend. Unlike a quotation, which is a firm offer and a binding commitment to a specific price, an estimate is an educated guess based on your past experience. If material costs rise or the job takes longer than expected, the final invoice can legitimately exceed the estimated amount. You should use estimates for complex or highly variable work, such as construction, software development, or consulting. Once the project scope becomes completely clear, you can replace the estimate with a formal quotation. Providing an accurate estimate builds trust with your clients and sets realistic financial expectations before any work begins.
How Estimate works
The process begins when a potential client requests a price for a new project. You evaluate the requested scope of work, breaking it down into estimated hours, labour rates, and anticipated material costs. Next, you draft the estimate document, clearly stating that the figures are approximate and subject to change. You present this document to the client for review. If the client accepts the rough figures, you might proceed to negotiate the finer details. Once both parties agree on the exact requirements, you typically issue a formal quotation to lock in the price. Finally, after the work is complete, you generate the actual invoice based on the real time and materials used.
- The client requests a rough price for a proposed project.
- You calculate projected costs for labour, materials, and overheads.
- You issue an estimate document stating the figures are approximate.
- The client reviews the estimated costs against their project budget.
- You issue a final quotation or proceed to invoice actuals.
Worked example
Gulf Contracting LLC is asked to renovate a small office. The exact structural condition behind the walls is unknown. The manager prepares an estimate projecting 40 hours of labour at $50 per hour, totalling $2,000. They also estimate $1,500 for materials. The total estimate given to the client is $3,500. During the renovation, they discover water damage that requires an extra 10 hours of labour ($500) and $300 in additional materials. Because the original document was an estimate and not a fixed quotation, Gulf Contracting legitimately bills the client for the actual final cost of $4,300.
Why it matters for your business
Understanding the exact nature of an estimate protects your profit margins. If you mistakenly label a rough guess as a quotation, you might be legally bound to honour that price even if your material costs double. By clearly marking the document as an estimate, you give yourself the flexibility to adjust the final invoice based on reality. This flexibility is vital for long-term projects where supply chains or client demands fluctuate. Using a system like Paper & Pen, where Sales and Invoicing is free forever, helps you easily convert these initial estimates into firm quotations or final invoices.
See also
Questions
Common questions
Can an invoice be higher than an estimate?
What is the difference between an estimate and a quotation?
Related terms
- Quotation A quotation is a formal document given to a potential buyer that offers specific goods or services at a fixed price under defined conditions for a limited time.
- Proforma invoice A proforma invoice is a preliminary bill sent to buyers in advance of a shipment or service, detailing the estimated costs without creating a legal demand for payment or an accounting receivable.
- Invoice An invoice is a commercial document issued by a seller to a buyer, detailing the products or services provided and specifying the amount owed for that transaction.
- Sales order A sales order is an internal document generated by a seller upon receiving a purchase order, confirming the details of the goods or services to be provided to the buyer.
- Credit note A credit note is a commercial document issued by a seller to a buyer, reducing or cancelling the amount owed on a previously issued invoice due to errors, returns, or damages.
- Debit note A debit note is a commercial document issued by a buyer to request a credit, or by a seller to increase the amount owed on an existing invoice.