Flexible invoice formats handle mixed services, expenses, and client terms. Everhour connects tracked work to invoice-ready billing details.
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| Description | Qty | Rate | Tax | Amount |
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Flexible invoicing software helps you create a client-ready invoice when the work does not fit one rigid template. You may bill a fixed project fee, hourly services, reimbursable expenses, or a mix of all three. The finished document still needs seller and buyer details, an invoice number, issue date, due date, line items, subtotal, tax line where applicable, total due, payment terms, and remit-to details.
The invoice also needs to stay separate from nearby documents. An estimate or quote gives a pre-work price offer. A receipt proves payment received. An invoice requests payment for goods or services delivered under your agreement. For ordinary United States businesses, there is no prescribed federal private-sector invoice form. Invoices serve as supporting documents that help show business transactions, gross receipts, income, and expenses.
A flexible invoice should let you add the fields the client needs without weakening the core record. Keep the invoice number, invoice date, buyer, seller, line descriptions, quantities, rates, totals, tax treatment, payment terms, and remit-to information consistent. Add optional fields such as project name, purchase order number, service period, discount, expense category, or client contact only when they clarify approval or payment.
Tax fields need special care. The United States does not use a national VAT or GST invoice regime, and there is no United States VAT or GST registration number for invoices. Sales and use tax obligations come from state and local rules, nexus, product or service taxability, and the place of sale. A flexible format should support a real state-level sales-tax setup where required instead of treating tax as one flat national field.
Line items should mirror the agreement the client approved. A fixed-fee project can use one line with quantity 1 and the agreed price. Hourly work should show the service, hours, rate, and extended amount. Expenses should appear as separate lines when the client needs backup or when they receive different tax treatment. Mixed invoices work best when fixed fees, hourly work, discounts, and expenses do not hide inside one vague description.
Federal contracts are the clearest national exception to ordinary private-sector flexibility. FAR 32.905 defines proper invoice fields for federal procurement, including contractor details, invoice date and number, contract or order references, descriptions, quantities, unit and extended prices, shipping and payment terms, remittance details, defect-contact details, and TIN or EFT banking data when agency procedures require them. FAR 32.904 generally uses a 30-day payment timing standard for most federal contract invoice payments.
A free invoice tool is enough when you need a one-time PDF, a simple client bill, or a clean document for a small job. It works when the numbers already exist, the client terms are clear, and you only need to enter lines, review tax, set the due date, and send the file. The tool should leave you with an invoice you can download, store, and match to payment.
A managed workflow becomes necessary when billable time, expenses, discounts, client terms, and invoice status change across projects. Everhour Billing & Invoicing turns tracked billable time and expenses into invoices, excludes non-billable work, groups line items by structures such as project, task, person, or date, and marks invoiced time so the same work does not appear on a future invoice. That record matters when billing needs review, export, or follow-up.
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Keep seller and buyer details, invoice number, invoice date, due date, line descriptions, quantities, rates, subtotal, tax line where applicable, total due, payment terms, and remit-to details consistent. Optional fields can change by client or project, but the core fields create the record a payer needs to approve, pay, and archive the invoice.
Yes. Use separate line items for fixed fees and hourly services so the client can see the pricing basis for each charge. A fixed-fee line can use quantity 1 with the agreed amount. An hourly line should show hours, rate, and extended amount. This structure keeps approval cleaner than blending different billing methods into one description.
No. The United States does not use a national VAT or GST invoice regime, and there is no United States VAT or GST registration number for invoices. Sales and use tax is handled by state and local jurisdictions. Sellers that make taxable sales may need state-level sales-tax registration, such as a seller's permit where required.
The software should let you apply tax according to the state and local rule that fits the sale, not a single national rate. Service taxability varies by state and service type. California generally taxes retail sales of tangible personal property and only some service or labor charges, while Texas defines 16 broad categories of taxable services.
Too much editable structure creates mistakes when users overwrite invoice numbers, mix paid and unpaid charges, hide discounts inside descriptions, or reuse tax settings for a different state. Keep stable fields locked or standardized, then allow controlled changes for service period, project, purchase order, expenses, discounts, tax treatment, and payment terms.
Everhour Billing & Invoicing lets teams select uninvoiced time and expenses, preview the breakdown, and generate an invoice from billable time, project or member rates, and billable expenses. Invoice data can be grouped by project, task, person, date, or another available breakdown to match the client's billing format.
Everhour reports can show billable, non-billable, invoiced, and uninvoiced amounts alongside cost, revenue, and profit. Teams can filter, group, export, or schedule reports so invoice status and project billing data stay visible after invoices move to QuickBooks Online, Xero, or FreshBooks.
Use Everhour to convert tracked billable time and expenses into structured invoices, group lines by client needs, and keep invoiced work out of future bills.
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