Budget narrative prompt builder
Funders do not fund spreadsheets — they fund justified plans. A budget narrative is the prose that turns each line item into a defensible argument: what the money buys, how the figure was reached, and how it moves the project toward its goals. This builder takes your line items and project context and produces an LLM prompt that writes that narrative cleanly and consistently.
How it works
You paste your budget line items with their amounts, describe the project goals, and add any funder requirements — cost categories, caps, matching-fund rules, or allowable-expense policies. The builder assembles a prompt that instructs the model to justify each line in turn: what it covers, how the amount was derived, and which project activity or outcome it supports. It groups costs by category if the funder requires it and explicitly forbids inventing figures, so every number in the narrative comes from your input.
What reviewers look for in a budget narrative
Budget reviewers — whether at a grant-making body, a procurement panel, or an internal finance committee — are checking three things:
Necessity. Is this cost genuinely required to achieve the project’s goals, or could the work be done without it? The narrative should name the specific activity each item enables.
Reasonableness. Is the amount appropriate for what is being bought? For staff costs, showing a calculation (hours × rate, or FTE × salary) is far more convincing than a flat figure. For equipment or services, benchmarking against a market rate or explaining why a specific supplier was chosen closes the question.
Eligibility. Does this cost fall within the funder’s allowable categories? Some funders exclude indirect costs, VAT, equipment over a certain threshold, or costs incurred before the project start date. The narrative should either confirm eligibility explicitly or explain an exemption.
Common pitfalls in budget narratives
Restating the numbers instead of justifying them. “Staff costs: £45,000” is not a justification. “One project coordinator, 1.0 FTE at £45,000 per annum for twelve months, responsible for X, Y, and Z deliverables” is.
Vague activity descriptions. “General project management” is the most common weak entry. Name the specific outputs — reports, events, data sets — the role will produce.
Missing the maths. If three consultants will each work forty days, the reviewer will check 3 × 40 = 120 days × day rate. Show that calculation rather than leaving it implicit.
Ignoring matching funds. If the project requires match funding, the narrative should name the source, amount, and whether it is cash or in-kind, and confirm it is confirmed rather than speculative.
Tips and notes
- Connect every cost to an outcome. Reviewers reward a clear line from spend to impact. The prompt requires each justification to name the activity it enables.
- Show your maths. “5 staff × 0.2 FTE × £45,000” is more credible than a flat number. Include the calculation in your line items and the prompt will carry it through.
- Mirror the funder’s categories. If the call lists allowable cost headings, paste them into the funder requirements field so the narrative matches the scoring rubric.
- Leave the numbers to you. The prompt will flag, not fabricate, any line without a justification — fill those gaps before submitting.