Client Billing Information Form and Invoice Setup Checklist

Overview

Incorrect billing information creates avoidable delays. A client may reject an invoice because the legal entity name is wrong, a purchase order is missing, the invoice was sent to the wrong mailbox, or the currency and tax treatment do not match the agreement. These problems are especially common when the person who approves work is not the person who processes payments.

Collect billing details during client onboarding, then confirm them against the contract, quote, purchase order, or statement of work. Do not assume that the name used in everyday communication is the name that belongs on the invoice. A trading name, parent company, subsidiary, and registered legal entity may all be different.

Keep the completed form with the client record and restrict access to information that is not needed for day-to-day billing. Review it again when the contract changes, a new entity is added, or a client tells you its payment process has changed.

Copyable client billing information form

Send these fields to the client as part of your onboarding process. Mark items as “not applicable” rather than leaving important fields ambiguous.

• Client legal name: The exact entity that will receive the invoice.
• Trading or brand name: If different from the legal name.
• Billing address: Street, city, region, postal code, and country, as required for the client’s records.
• Tax or registration details: Tax identification number, VAT number, or other identifier if applicable to the transaction.
• Primary billing contact: Name, role, email address, and preferred communication method.
• Accounts payable contact or mailbox: The destination for invoices, credit notes, and payment questions.
• Purchase order requirements: Whether a purchase order, project code, cost centre, or other reference must appear on every invoice.
• Contract or engagement reference: Agreement number, statement-of-work reference, or client account number.
• Currency: The currency agreed for fees, expenses, taxes, and payment.
• Billing schedule: Milestone, time-based, recurring, deposit-and-balance, or another arrangement.
• Invoice timing: For example, on completion, at the start of a period, or on a recurring date.
• Payment terms: The agreed number of days or specific due date calculation.
• Payment method: Bank transfer, card, payment link, or another accepted method.
• Remittance instructions: Where the client should send payment confirmation or remittance advice.
• Invoice delivery format: PDF, online invoice, portal upload, or another approved format.
• Approval route: Who reviews the work, who approves the invoice, and who releases payment.

Checklist by scenario

New client or first project

1. Compare the legal name and address with the signed agreement or client-provided records.
2. Ask whether the client requires a purchase order before work begins or before an invoice can be paid.
3. Confirm the currency, tax treatment, billing frequency, payment terms, and invoice delivery route.
4. Identify the operational contact separately from the accounts payable contact.
5. Record the client’s preferred references, including a project code or contract number.
6. Send a short confirmation summary before the first invoice is issued.

Recurring work, retainers, or subscriptions

1. Confirm the billing start date, renewal or review date, and period covered by each invoice.
2. Define what happens when the billing date falls on a weekend, holiday, or non-working day if the agreement does not already say.
3. Check whether the monthly amount, usage component, expenses, or tax treatment can change.
4. Confirm whether the same purchase order remains valid for future invoices.
5. Set a calendar reminder to review the billing setup before renewal or a planned price change.

For recurring arrangements, the recurring invoice template and billing schedule guide can help you document the period, amount, and delivery routine.

Milestones, deposits, and final balances

1. List each invoice trigger and the evidence needed to show that the trigger was reached.
2. Record the deposit amount or percentage, whether it is applied to the final balance, and how it should be described.
3. Confirm how approved expenses, credits, discounts, and adjustments will appear.
4. Check that the invoice references the relevant milestone, deliverable, or acceptance date.

Use the invoice total calculator guide when checking taxes, discounts, deposits, and amounts due.

Client with multiple entities or locations

1. Create a separate billing record for each legal entity, subsidiary, or branch that may be invoiced.
2. Record the correct currency, tax identifier, address, purchase order process, and payment contact for each entity.
3. Do not reuse an invoice template populated for one entity without checking every field.
4. Ask whether a central accounts payable team needs invoices grouped, uploaded, or labelled in a particular way.

What to double-check before sending

Use this final invoice setup checklist immediately before issuing the first invoice and whenever billing details change:

• Names and addresses: The seller and client names match the relevant agreement and the invoice identifies the correct legal entity.
• Tax details: Required tax numbers, rates, exemptions, and tax wording have been reviewed for the transaction’s location and circumstances. If you are unsure, confirm the treatment with a qualified adviser.
• References: The purchase order, contract number, project code, or cost centre is present and formatted as requested.
• Dates: The invoice date, service period, milestone date, and due date are consistent with the agreement.
• Currency and totals: Line items, taxes, discounts, deposits, expenses, and the final amount use the agreed currency and calculate correctly.
• Payment instructions: Bank details, payment links, and remittance instructions are current. Share sensitive payment changes through a trusted channel rather than relying on an unexpected email request.
• Delivery: The invoice is going to the approved mailbox, portal, or contact, with any required file name or attachment.
• Record keeping: Save the invoice, supporting documents, client confirmation, and delivery record in the appropriate client folder.

For tax-specific fields, compare the setup with the VAT invoice requirements checklist where relevant. For format decisions, see the guide comparing Word, Excel, PDF, and online invoice options.

Common mistakes

• Using a contact’s name as the legal customer name: Ask which entity is responsible for payment.
• Sending only to the project contact: Include accounts payable or upload through the required client portal.
• Leaving purchase order information until the invoice is ready: Ask about references during onboarding, before work is delivered.
• Copying old client details: Check the entity, address, tax number, currency, and bank instructions each time.
• Assuming payment terms from habit: Use the terms in the current agreement and show the due date clearly.
• Combining separate entities on one invoice: Issue separate invoices when the responsible legal entities or requirements differ.
• Changing bank details without verification: Confirm the change using a known contact and an established communication channel.
• Failing to track invoice status: Record when an invoice was sent, acknowledged, approved, paid, or queried. An invoice workflow checklist can help connect these steps.

Keep an invoice numbering system that is consistent and easy to trace. If an invoice becomes overdue, use agreed payment terms and a documented follow-up process rather than sending repeated informal messages.

When to revisit

Review the client billing information form at onboarding, before the first invoice, and whenever a billing event changes. Practical review points include:

• A new contract, statement of work, renewal, or project begins.
• The client changes its legal entity, address, tax registration, portal, or accounts payable contact.
• Your own business changes its legal details, tax registration, payment methods, or invoice format.
• Pricing, currency, payment terms, billing frequency, or expense treatment changes.
• A first invoice is rejected, delayed, or queried for an avoidable administrative reason.
• You introduce a new accounting, invoicing, CRM, or client onboarding tool.
• You prepare for a seasonal planning cycle or a period with many renewals and recurring invoices.

At each review, update the stored billing record, identify the person who approved the change, and test the next invoice against the revised details. A five-minute confirmation can prevent a longer payment delay. For ongoing work, pair this form with a clear payment terms and late payment reminder process so the billing setup remains useful after the invoice is sent.