Writing business proposals with AI
Proposals are the highest-value writing most businesses do and the writing they most often rush, because they are unpaid work done between paid work.
AI is well suited to the structural and expository parts, and poorly suited to the parts that actually win the deal. Knowing the split is what makes it useful.
What to give the AI before asking for anything
The quality of a proposal draft is almost entirely determined by the input. Provide:
- The client's own words. Paste the brief, the email, your notes from the call. Their vocabulary should appear in your proposal.
- What you are proposing in plain terms, including what you are deliberately not doing.
- The price and structure — you set these, never the AI.
- Two past proposals that worked, as voice references.
- Who reads it — a technical evaluator and a finance director need different emphasis.
- Length. Ask for two pages and you get two pages; leave it open and you get eight.
A structure that works
- Their problem, in their words. Demonstrates you listened. AI drafts this well from the brief.
- Your approach. What you will do, in sequence.
- Deliverables. Specific and countable.
- Exclusions. What is not included — the section that prevents disputes.
- Timeline. Realistic, with dependencies on them stated.
- Price and terms. Yours entirely.
- Why you. Relevant evidence, not a company history.
- Next step. One clear action.
The sections to write yourself
Three parts should not be AI-drafted, because they are where proposals are won or lost:
- The opening paragraph. It signals whether you understood the conversation. Generic openings lose readers immediately.
- Price and terms. A commercial judgement about risk, value and this specific client.
- Why you. Anything AI writes here will be plausible and unverifiable. Use real evidence — a comparable project, a measurable outcome, a named reference.
Making it not sound like AI
Readers now recognise AI prose, and recognising it costs you credibility. The tells and their fixes:
- Even paragraph lengths. Vary them. Use a one-sentence paragraph for emphasis.
- Triads everywhere — three adjectives, three benefits, three points. Break the pattern.
- Hedged, non-committal phrasing. Replace with specifics.
- No concrete numbers. Add real figures, dates and names.
- Inflated register — leverage, robust, seamless. Cut them.
Before it goes out
- Every figure verified. Prices, dates, quantities, timelines.
- Every claim about you substantiated. AI invents plausible credentials.
- Client name and details correct throughout. A wrong company name in paragraph six ends the pitch.
- Exclusions present.
- The next step unambiguous.
- Read aloud. The fastest way to catch anything that does not sound like you.
Frequently asked questions
Can AI write a business proposal?
It can draft the structural and expository sections well — problem statement, approach, deliverables, timeline. The opening, the pricing and the case for choosing you should be written by you, because that is where proposals are won.
What should I give the AI to get a usable draft?
The client's own brief and your call notes, what you are proposing including exclusions, your price, two past proposals as voice references, who will read it, and a target length.
How do I stop a proposal sounding AI-written?
Vary paragraph length, break the pattern of threes, replace hedged phrasing with specifics, add real figures and names, and cut inflated words like leverage and seamless. Then read it aloud.
Which sections should I never let AI write?
The opening paragraph, the price and terms, and the section on why the client should choose you. AI output there is plausible and unverifiable, which is the worst combination in a proposal.
What must I check before sending?
Every figure and date, every claim about your business, the client's name throughout, that exclusions are present, and that the next step is unambiguous. AI invents plausible credentials.
Should I tell the client AI helped draft it?
Unless their contract or tender rules require disclosure, it is generally treated like any other drafting tool. What matters is that the thinking, the pricing and the commitments are genuinely yours.