Free Consulting Retainer Proforma Invoice Template & Generator
Corporate clients cannot pay an advisory invoice without a purchase order, and the order has to be raised before the engagement starts. This proforma is what procurement builds it from: the retainer period, the monthly fee, the hours included each month, the rate for anything past them, an approved ceiling for travel, and one total sized to cover the whole term rather than the fee alone.
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| Description | Qty | Rate | Amount |
|---|---|---|---|
| Monthly advisory retainer | 1 | $4,500.00 | $4,500.00 |
| Approved travel allowance | 1 | $600.00 | $600.00 |
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Use-case checklist
What to include in a consulting retainer proforma invoice
The failure here is predictable and expensive. Procurement raises the purchase order for the retainer fee only, because that is the only number on the proforma. In month two you work fifty-two hours instead of forty, invoice the overage, and accounts payable blocks the invoice because it exceeds the order. Getting an order increased means re-entering the approval chain that took three weeks the first time, while you keep working because the client's deadline has not moved, and the money sits unbilled. Putting an overage allowance and a travel ceiling on the proforma is what prevents that, and it costs the client nothing at the time, because allowance that is never used is simply never invoiced.
- consultant and client legal details
- retainer period and included services
- amount, currency, and overage basis
- PO and payment requirements
- validity and preliminary status
Example starting lines
| Description | Qty | Rate |
|---|---|---|
| Monthly advisory retainer | 1 | $4,500 |
| Approved travel allowance | 1 | $600 |
Complete it cleanly
State the covered period, services, included hours or access, overage rate, currency, payment terms, client PO requirement, validity, and that the final invoice will replace the proforma.
How to make a consulting retainer proforma invoice in 6 steps
Open the proforma invoice generator
Start from this page so the proforma invoice opens with fields and sample lines already set up for consultants and advisory firms. No account is needed to create or preview.
Enter both parties
Add your business name, address and contact details, then the customer name and address exactly as they should appear on the record.
Add the consulting retainer lines
Replace each sample line with the real work or goods. Make sure the document shows consultant and client legal details, retainer period and included services, amount, currency, and overage basis.
Check the figures
Totals calculate as you type. Confirm quantities, rates, any tax line and the final total against your own records before you send anything.
Set the reference and dates
Give the proforma invoice a unique number and the correct date so it can be traced later and matched to related documents.
Review and download the PDF
State the covered period, services, included hours or access, overage rate, currency, payment terms, client PO requirement, validity, and that the final invoice will replace the proforma. Preview is free; a PDF download costs $4.99, or is included with Unlimited.
Worked example
A six-month privacy retainer sized so the PO covers the overage
Orlow Advisory LLC issues proforma PF-RT-0247 on September 8, 2026 to Keldane Health Systems Inc. for a retainer running October 1, 2026 through March 31, 2027. Keldane's procurement team raises a single purchase order for the term, and every invoice has to quote it.
- Retainer period covered by this proforma
- October 1, 2026 through March 31, 2027, six monthly periods
- Monthly retainer, 40 advisory hours included, unused hours do not carry forward
- $7,800.00
- Retainer subtotal for the term, $7,800.00 times six periods
- $46,800.00
- Overage rate above 40 hours in any month, billed in quarter-hour increments
- $265.00 per hour
- Overage allowance requested on the purchase order, 24 hours across the term
- $6,360.00
- Travel and third-party costs, at cost, only with prior written approval, term ceiling
- $4,000.00
- Total purchase order value requested from Keldane procurement
- $57,160.00
- Billing against the order
- Monthly in arrears, $7,800.00 plus any approved overage, PO number on every invoice
- Validity, after which the proforma is reissued under a new number
- Rates firm for a start on or before October 1, 2026
- Status of this document
- Proforma for purchase order creation, not payable; a numbered invoice follows each month
Allowance that goes unused is never invoiced, so a purchase order sized at $57,160.00 does not commit Keldane to spend it. Sizing it at $46,800.00 does commit both sides to a second approval cycle the first month the work runs long. All parties and figures here are invented.
When this document is the right choice
Use this proforma invoice to show an expected transaction before a final invoice exists. A proforma invoice is a preliminary commercial document, not a final tax invoice or proof that payment is due. Replace it with the final invoice when the transaction is confirmed.
Frequently asked questions
Why not raise the order for the retainer fee and increase it later if we go over?
Because the increase arrives after the work, not before it. The month you exceed forty hours is usually a month with a deadline in it, so the invoice that gets blocked is for work already delivered, and you are waiting on the same approval chain while carrying the cost. Sizing the order for a realistic overage band up front is free to the client, since unused allowance is never billed, and it removes the one thing that reliably delays payment on retainer work.
The client wants unused hours to roll over into the next month. How should that show?
Say so explicitly on the proforma, because the default assumption runs the other way and silence gets read as no rollover. If you do allow it, define what happens at the end of the term, since hours banked in October and unused in March are a liability you either serve or refund. A common shape is rollover within the term only, with the balance expiring at the end, but whatever you agree, the sentence belongs on this document and in the engagement letter.
The work has to start October 1 but procurement will not have an order number until mid-month. Do I begin?
That is a commercial call, but whatever you decide, do not send an invoice into the gap. An invoice without the order number on it is the one accounts payable rejects, and re-dating it two weeks later rarely survives a second look. If you start, get the project sponsor to confirm in writing that the retainer is authorized and the order is in process, name the engagement letter and its date in that email, and hold the October invoice until the number exists rather than issuing it twice. If the sponsor will not put that in writing, the start date is the thing to move, not the paperwork.
The client wants to prepay the six months rather than be billed monthly. How does the document change?
The rows stay the same; the billing line changes to one payment against a single invoice at the start of the term, and you should still show the monthly fee and included hours so the overage rate has a base to sit against. Be aware that money taken for services not yet delivered is often carried differently in your books than fees you have earned, so ask your accountant how to record the prepayment before the term starts.
How do I keep time records that still hold up when the overage is questioned six months later?
Record time against the engagement at task level as the work happens, not reconstructed at month end, and send Keldane a short statement each month showing hours consumed against the 40 included, including the months you use fewer. The point is that nobody is surprised. Flag it when a month is running toward 32 or 35 hours, and get the sponsor's written approval before you book anything above 40, so the overage arrives as a decision the client already made rather than as a line on an invoice they have to go and justify. A client who can see each month's consumption also stops asking whether the retainer is sized right, because the answer is already in front of them.
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