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Grant Budget Narrative and Justification
Paste your grant budget. Get a line-by-line justification showing how each cost was calculated and why the project needs it, with the math checked.
River's grant budget narrative writer turns the numbers in your grant budget into the written justification funders ask for. Paste the budget, or attach the spreadsheet. River checks the arithmetic, then writes each line in the funder's categories: what the cost is, how it was calculated, and why the project needs it. For federal and pass-through awards it applies the cost rules that decide what may be charged and how indirect costs are figured. Anything that does not add up is flagged, not smoothed over.
Most budget narrative examples show finished paragraphs for an imaginary project, which leaves you copying phrasing without the reasoning. Reviewers look for the reasoning. They want to see that 0.5 FTE was chosen because the coordinator splits time with another program, and that travel was costed from real trips. This draft writes every justification as calculation plus purpose, using your numbers. If the budget itself still needs building, the grant budget template sets it up in the funder's categories and your accounts.
This is for grant writers and finance staff finishing an application, and program managers asked to explain a budget they did not build. Use it once the numbers are settled and the narrative is close. It pairs with the government grant narrative writer for federal applications and the foundation grant proposal writer for private funders. After an award, the grant compliance register tracks which budget changes need the funder's approval.
What a strong budget justification shows
A budget justification answers two questions for each line: how did you get this number, and why does the project need it. The first is arithmetic shown in the text, such as 20 hours a week for 40 weeks at $18 an hour. The second ties the cost to an activity in the narrative. Reviewers compare the two documents, so a staff role in the budget with no mention in the narrative, or the reverse, reads as careless planning.
For federal money, the Uniform Guidance cost principles apply. A cost must be necessary, reasonable and allocable to the award, consistent with your own policies, and adequately documented. Personnel costs should match the effort staff will actually spend. Equipment generally means an item costing $10,000 or more per unit, or less if your own capitalisation policy is lower. Anything below that is usually supplies. Many state and foundation funders use similar categories, so the same discipline works there too.
Indirect costs need their own explanation. An organisation with a negotiated rate cites the agreement and applies it to the base it names. One without a rate may usually charge a de minimis rate of up to 15 percent of modified total direct costs on federal awards. That base leaves out equipment, rent, participant support costs and each subaward above $50,000. Foundations often cap overhead at their own percentage, which the guidelines state. Show the base and the arithmetic either way.
How it works
Paste the budget
Paste the line items or attach the spreadsheet, including salaries, fringe, travel, supplies and any indirect rate.
Name the funder
Add the funder and a line on the project, or attach the narrative so costs tie to activities.
River justifies each line
Every cost is checked and explained as calculation plus purpose, under the cost rules that apply.
Fix it in chat
Correct flagged lines, change a rate, or rewrite the justification for a funder with different categories.
What you get
- A justification for every budget line, giving the calculation and the purpose in the funder's categories
- An arithmetic check of every line, subtotal and total, with mismatches listed rather than fixed silently
- Personnel lines explained by role, effort or FTE, salary basis and the activities each person delivers
- Indirect costs shown with the rate, its source and the base it is applied to
- Flags for costs that commonly need prior approval or are unallowable under federal rules
- A list of narrative activities with no budget line, and budget lines with no narrative activity
Common questions
What is the difference between a budget narrative and a budget justification?
Funders use both names, often for the same document: a written explanation of each budget line. Some use budget narrative for a short prose overview of the whole budget and justification for the line-by-line detail. River writes the line-by-line version, with a brief overview first, and follows whichever label and format the funder uses.
Will it change my numbers?
No. It explains the numbers you give and checks the arithmetic. If a line does not multiply out, a subtotal is off, or the indirect base looks wrong, it lists the problem and the likely correct figure for you to confirm. Your spreadsheet stays the source of truth, and the narrative is updated once you decide.
Does it know which costs are allowed?
It flags costs that federal rules commonly restrict or that need prior approval, such as entertainment, alcohol, fundraising costs or equipment purchases, and cites the rule it is relying on. It does not decide allowability for you. Your funder's terms and your auditor have the final word, and a flag means check, not reject.
We have no negotiated indirect rate. What should we charge?
For federal awards an organisation without a negotiated rate can usually use the de minimis rate of up to 15 percent of modified total direct costs, unless the notice says otherwise. Foundations set their own limits in their guidelines. If you have not chosen, River shows the de minimis calculation and labels it as an assumption to confirm.
Does it work for foundation budgets too?
Yes. Foundations usually ask for less detail and use their own categories, often personnel, program costs and overhead. River follows the categories the funder gives and keeps the explanation shorter. Building a budget that rolls up into those categories from your accounting is a separate step that the grant budget template covers.
Sources
Built by
Chandler Supple
Co-founder & CEO, River
Chandler has spent the last six years working in AI, building tools for millions of users and Fortune 100 companies. In 2025, he co-founded River to build a new kind of operating system for AI agents.
Grant Budget Narrative and Justification
Describe what you need, add any files you have, and your workspace opens with the work already underway.