Grant Writer Invoice Template: Hourly and Project Fees

Quick answer: A grant writer invoice template bills a nonprofit, school or agency for grant research, proposal writing, budgets and submission support. It shows hours or project milestones, the rate, any retainer applied and the balance due. It should never bill a percentage of the grant award, because the Grant Professionals Association and AFP ethics codes prohibit percentage-based compensation.

Grant writing is professional consulting work for clients who answer to boards and funders, so they expect clean, defensible invoices. This guide explains how grant writers structure hourly, project and retainer fees, why commission and contingency pricing is off the table, and how to lay out a grant writer invoice that a nonprofit finance team can approve without questions. A full example invoice with numbers is included.

What is a grant writer invoice?

A grant writer invoice is a bill from an independent grant writer or grant consulting firm to a client organization for grant-related services. Typical services include funder prospect research, writing letters of inquiry and full proposals, preparing budgets and budget justifications, collecting attachments, submitting through funder portals or Grants.gov, and post-award reporting.

Clients are usually nonprofits, schools, tribal governments, local agencies and sometimes small businesses applying for programs like those in our small business grants guide. Because nonprofit clients often have a treasurer or finance committee approving payments, the invoice needs to match the contract and show work in a way that is easy to audit. If you also bill other nonprofit work, see our nonprofit invoice template for how organizations themselves bill fee-for-service work.

Why grant writers should not charge a percentage of the grant

New grant writers and nonprofit boards sometimes suggest a commission: "We'll pay you 10% of whatever you win." It sounds low-risk for the nonprofit, but the major professional associations treat it as unethical, and many funders will not accept it.

• Grant Professionals Association (GPA): the GPA Code of Ethics states that it is a violation for a member to accept a percentage of a grant award as compensation for grant writing or any services related to a grant submission. GPA says grant professionals should be paid by salary or fee regardless of the outcome, and that performance-based pay is acceptable only if it follows prevailing practice and is not based on a percentage of grant funds. Members who violate the code risk their membership and the Grant Professional Certified (GPC) credential.
• Association of Fundraising Professionals (AFP): Standard 24 of the AFP Code of Ethical Standards (the revised code that became enforceable on January 1, 2025) tells members to decline receiving or paying finder's fees, commissions, or compensation based on a percentage of funds raised. The earlier version of the code had a similar rule as Standard 21.

The reasons go beyond rule-following:

• Funders generally won't pay for it. Grant funds are restricted to the purposes in the approved budget. Most foundations will not let a nonprofit spend award money on a fee for work done before the award. Under the federal Uniform Guidance, proposal preparation costs are normally treated as indirect costs (2 CFR 200.460), not charged as a direct line on the award.
• It creates a conflict of interest. A writer paid on commission has an incentive to chase large grants that may not fit the mission or to overstate capacity.
• It ignores how grants work. Strong proposals are often declined for reasons outside the writer's control, such as funder priorities or budget cuts. The work still had value.

The practical takeaway for invoicing: every line on a grant writer invoice should describe work performed or a fixed deliverable, and the amount should be the same whether the proposal is funded or not.

How do grant writers charge?

There are three common fee structures. Many consultants use a mix, depending on the client.

Model	Best for	How it appears on the invoice
Hourly	Prospect research, editing, open-ended support, smaller clients	Date or task, hours, hourly rate, line total
Project (flat) fee	A specific proposal, LOI or federal application with a clear scope	Milestone, percentage of fee, amount
Monthly retainer	Ongoing grant programs: calendar, several proposals, reports	Retainer for the month, hours included, overage hours

Hourly billing

Hourly billing is transparent and suits work that is hard to scope. Track time by task (research, drafting, budget, revisions, submission) and summarize on the invoice. A timesheet template makes this easier, and our guide to invoicing for hourly work covers rounding and minimum increments.

Project fees

Many nonprofits prefer a fixed project fee because it fits their budget process. Estimate the hours, multiply by your rate, add a buffer for revisions, and quote one price. Then invoice in milestones, for example 50% at contract signing and 50% at submission. The final payment should be tied to submission, not to the funding decision.

Retainers

A monthly retainer covers a set number of hours or defined services, such as maintaining a grant calendar, writing two foundation proposals and one report per month. Our retainer invoice guide explains how to show hours used and overages.

Rates vary widely by region, experience and complexity, so we do not quote a single figure. For context on freelance writing pricing generally, see our guide to freelance writing rates, and expect federal applications with complex budgets and compliance forms to sit at the higher end of any range.

How to estimate a flat project fee for a grant proposal

Most nonprofits ask "how much will this cost?" before they ask about rates. A flat fee built from an hours estimate answers that and protects you from underpricing. Break the proposal into tasks and estimate each one based on past projects:

Task	Foundation proposal (estimated hours)	Federal application (estimated hours)
Kickoff call and document gathering	2	4
Reading the funder guidelines or notice of funding opportunity	1	5
Narrative drafting	14	35
Budget and budget justification	4	12
Logic model, evaluation plan and forms	3	10
Revisions and final edit	4	8
Attachments and submission support	2	6
Total	30	80

At an illustrative $90 per hour, the foundation proposal comes to $2,700 and the federal application to $7,200. Many consultants add a 10% to 15% buffer for client delays and unexpected attachments, then round. The foundation proposal might be quoted at $3,000, payable $1,500 at signing and $1,500 at submission. The hours figures above are examples, not benchmarks: track your own time on every project so future quotes rest on real data.

Spell out what the fee does not cover: additional funders, a second full rewrite because the program design changed, or post-award reporting. Each of those is quoted separately. This is the same discipline any freelancer uses with a freelance contract, and it keeps a flat fee from turning into unpaid hours.

What should a grant writer invoice include?

Field	Example
Your business details	Name or firm, address, email, phone, EIN or business ID if you use one
Client details	Organization legal name, contact (executive director or finance lead), address
Invoice number and date	GW-2026-031, November 3, 2026
Contract or SOW reference	"Per agreement dated September 15, 2026"
Project and funder	"Community Health Foundation, 2027 Capacity Building Grant"
Line items	Tasks with hours and rate, or milestone with fee
Retainer or deposit applied	Negative line showing prior payment
Balance due and terms	Net 15 or net 30, payment methods
Fee statement	"Fees are not contingent on funding decisions."

A statement of work that lists funders, deliverables and deadlines makes each invoice easy to approve, because every line maps to the agreement.

Grant writer invoice example

This example shows an hourly invoice for a full foundation proposal. The rate is illustrative. The client paid a $1,000 retainer at signing, which is applied to this invoice.

Clearpath Grant Services | Invoice GW-2026-031 | Date: November 3, 2026 | Due: November 18, 2026 (net 15)
Bill to: Riverside Youth Literacy Project, Attn: Executive Director
Project: Community Health Foundation, 2027 Capacity Building Grant (submitted October 31, 2026)

Description	Hours	Rate	Amount
Funder research and eligibility review	6.0	$90.00	$540.00
Needs statement, program narrative and evaluation plan drafting	16.0	$90.00	$1,440.00
Project budget and budget justification	5.0	$90.00	$450.00
Revisions after board and staff review	4.0	$90.00	$360.00
Attachment assembly and portal submission support	3.0	$90.00	$270.00
Subtotal (34.0 hours)			$3,060.00
Less retainer received September 15, 2026			-$1,000.00
Balance due			$2,060.00

Note under the table: "Fees are for services performed and are not contingent on the funding decision. Payable by ACH or check." Notice what is missing: there is no line tied to the $50,000 requested. That is exactly how it should be. You can build this invoice in our free invoice generator and save it as a PDF for the client's files.

How to invoice grant writing clients step by step

1. Agree the scope in writing. List the funders, deliverables (LOI, full proposal, budget, attachments), draft and review dates, and who submits.
2. Choose the fee model. Hourly, project fee or retainer, with a rate for work outside scope. Our consulting invoice template uses the same principles.
3. Collect a retainer or first milestone. Invoice at signing so you are not carrying the full risk of a long project.
4. Track time by task. Even with a flat fee, tracking helps you price the next proposal accurately.
5. Invoice at the milestone, not the award. Send the final invoice when the proposal is submitted. The funding decision can take months.
6. Reference the contract on every invoice. Finance committees approve faster when they can match the invoice to an agreement.
7. Send a W-9 with your first invoice. The client will need it to issue a 1099-NEC if you are paid $2,000 or more in 2026; see our guide to W-9 and 1099 forms for contractors.
8. Follow up politely. Nonprofits often pay on a board or check-signing cycle. Ask about it upfront and time your invoice to meet it.

What about post-award work and grant management?

After a grant is awarded, many grant writers help with reporting, budget modifications and renewal applications. This is new work, so invoice it separately at your normal rate. Some funders allow grant administration costs to be included in the approved budget, in which case the nonprofit may be able to pay for post-award reporting from the award itself. That is very different from a commission: the cost is disclosed to the funder in advance, approved in the budget, and based on work performed.

For multi-year federal awards, the organization must follow the cost principles in 2 CFR Part 200 and the specific terms of the award. If you are helping a new organization get ready for federal funding, its SAM.gov registration and Unique Entity ID need to be in place before applying through Grants.gov. Our guide to starting a nonprofit covers the early registration steps.

Common grant writer invoicing mistakes

• Agreeing to a contingency or percentage fee. It conflicts with the GPA and AFP codes, usually cannot be paid from grant funds, and can damage your reputation with funders.
• Waiting for the award to bill. Tie the final payment to submission.
• Vague line items. "Grant writing, $3,000" invites questions. Break it into tasks or milestones.
• No scope limits. Unlimited revisions or "any grants we find" leads to unpaid work. Price additional proposals and extra rounds separately; see our guide to scope creep and change orders.
• Billing the wrong entity. Invoice the legal organization (or its fiscal sponsor), not a volunteer's name.
• Forgetting the W-9. Missing tax forms delay the first payment at many nonprofits.

Grant writer invoice checklist

• Your name or firm, contact details and invoice number
• Client's legal name and the person approving payment
• Contract reference, funder name and grant program
• Tasks with hours and rate, or milestones with fees
• Retainer or deposit applied
• Balance due, due date and payment methods
• A statement that fees are not contingent on funding
• No percentage-of-award line, ever

A professional grant writer invoice template bills for your expertise and time, not for the outcome. Keep fees hourly, project-based or on retainer, reference the contract, and send the final invoice at submission. When you are ready, our invoice generator is free, requires no sign-up, and creates a downloadable PDF in your browser. This article is general information, not legal or tax advice.