Everhour turns engineering time and expenses into invoices, while contract terms still define rates, milestones, taxes, and payment timing.
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Engineering invoices usually start with the contract's pricing method. A time-and-materials project needs labor hours, fixed hourly rates, and actual material costs shown separately. A labor-hour project centers on hours, labor categories, and fixed hourly rates because the contractor supplies no materials. A fixed-price engagement bills the agreed price or milestone amount, not the engineer's actual incurred cost.
The page supports practical invoice preparation for engineers, engineering firms, and technical consultants that bill clients by phase, deliverable, labor category, or reimbursable cost. Use it to organize client details, service descriptions, dates, rates, expenses, payment terms, and tax lines before sending a polished invoice or recording the transaction in accounting.
A useful engineering invoice makes the compensation model visible. For time-and-materials work, one line can show "Senior engineer, structural review, 12 hours at $175" and another can show approved materials at actual cost. For labor-hour work, material lines should stay out of the invoice unless the contract allows reimbursable expenses separately.
Fixed-price and milestone invoices need different detail. The invoice should point to the defined scope, phase, or deliverable, such as "60% design package, milestone 2." Cost-reimbursement invoices need documented allowable incurred costs to the extent the contract requires, plus any fee only when the agreement provides for one. This structure reduces disputes because the client can connect every charge to the agreement.
The United States has no single federal private-sector invoice form and no national VAT or GST invoice regime. For ordinary businesses, invoices mainly serve recordkeeping and contract purposes. Sales and use tax depends on state and local rules, nexus, the product or service, and where the sale is sourced. Service taxability varies by state and service type.
Engineering invoices should use the identifiers the client or contract requires. A private client may request a W-9 for Taxpayer Identification Number reporting, but there is no U.S. VAT or GST registration number for invoices. Federal procurement is different: FAR proper-invoice rules include contractor details, invoice date and number, contract references, line items, payment terms, remittance details, and TIN or EFT banking data when agency procedures require them.
A free invoice tool is enough for a one-off engineering invoice when the scope is simple, the rates are already known, and you only need a clean document to send. It also works for a fixed-price milestone where the invoice does not need to pull live hours, separate billable from non-billable work, or preserve a history of uninvoiced time.
A managed workflow fits engineering teams that bill multiple projects, labor categories, reimbursable expenses, and recurring client work. Everhour Billing & Invoicing converts tracked billable time and expenses into invoices, calculates amounts from rates, excludes non-billable tasks, supports client defaults, and exports invoices to QuickBooks Online, Xero, or FreshBooks with status synced back to Everhour.
This content is for general information only, may not be fully up to date, and is provided without any warranty or liability.
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The invoice should show the billing model in the agreement. Time-and-materials invoices separate direct labor hours at fixed hourly rates from actual material costs. Labor-hour invoices focus on hours, labor categories, and fixed hourly rates. Fixed-price invoices use the agreed scope, milestone, or progress amount. Cost-reimbursement invoices document allowable incurred costs and any agreed fee.
Hourly, labor-hour, and time-and-materials invoices should list enough time detail for the client to verify the charge against the contract. Fixed-price invoices do not need to price every hour because the agreed price or milestone amount controls the invoice. Internal time records still matter for profitability, staffing, and future estimates.
Sales tax treatment depends on state and local rules, nexus, product or service taxability, and the place of sale. The United States does not use a national VAT or GST invoice regime. Some states tax certain services or labor charges, and others treat professional services differently. Use the applicable state and local rules instead of a single national rate.
Federal contract invoices must follow the contract and FAR proper-invoice requirements. FAR 32.905 lists fields such as contractor name and address, invoice date and number, contract or order references, descriptions, quantities, unit and extended prices, payment terms, remittance details, and TIN or EFT data when agency procedures require them. Payment is generally due 30 days after proper invoice receipt unless an allowed contract term says otherwise.
Mismatch between the invoice and the contract causes many disputes. A time-and-materials contract should not look like a vague flat-fee invoice, and a fixed-price milestone should not charge unapproved extra hours as if they were automatically billable. Clear labor categories, scope references, dates, expenses, and payment terms give the client a direct path to approve payment.
Everhour Billing & Invoicing converts tracked billable time and expenses into client invoices. It calculates invoice amounts from rates, time, and billable expenses while excluding non-billable work, then can export invoices to QuickBooks Online, Xero, or FreshBooks with invoice status visible back in Everhour.
Everhour separates cost rates from client-facing billable rates and supports default per-person rates with per-project overrides. Engineering teams can price work by project, member, or custom task rate, and dated rate changes keep older reports tied to the rates that applied when the work was performed.
Track approved engineering hours, expenses, rates, and non-billable tasks before billing starts. Everhour connects that work to invoices and accounting exports for cleaner client billing.
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