How to write a business proposal with Claude

A business proposal is the document that decides whether a client replies or closes the tab. Most people write it in a rush: they take an old proposal, swap a few lines and send it. Clients feel that. Here is how to build a proposal people read to the end, in one evening, together with Claude.

Why do most proposals fail?

A typical proposal opens by talking about the seller: years on the market, a great team. The client does not care, they are thinking about their own problem. A strong proposal is about the client: their situation, what they get, and what it costs. Claude helps you turn the text away from yourself and toward the reader.

What to prepare before you start

Before you open the chat, write a short brief. Without it Claude fills the gaps on its own and the result feels generic. You need five things:

• who the client is and what they do;
• the task they want solved;
• what exactly you offer, the scope of work or goods;
• the price and what it is made of;
• the timeline and the next step, a call or an invoice.

Even rough numbers are fine, write them as they are. Take exact money figures from your own math, do not ask Claude to invent them.

What prompt should you give Claude?

A prompt is the text task you give the model. It sets the role, the inputs and the format. Example you can copy and fill in:

"You are an experienced author of business proposals in [niche]. Write a proposal for a client.

Client: [who they are, what they do]. Their task: [the pain]. My offer: [scope]. Price: [amount and what it includes]. Timeline: [term], next step: [call or invoice].

Structure: a benefit-led headline, a short paragraph on the client situation, what they get, scope and price as a table, timeline, a call to action. Keep the tone businesslike, no filler, no cliches."

The more concrete the inputs, the less filler in the answer. Empty brackets get filled with generic words, so put real facts in.

How do you get it ready to send?

The first answer is a draft, not the final text. From here it is a dialogue, and each line makes the text tighter:

• "The headline is weak, give me five options built around the client benefit."
• "Cut the generic lines about professionalism, keep the specifics."
• "Make it one and a half times shorter, the client is busy."
• "Add a block that answers objections about price."

Claude keeps the context of the whole thread, so edits stack up. When you are happy, ask for a clean final version in one message, ready to paste into an email.

How do you check the proposal before sending?

The model sometimes states things you never gave it. So reread it yourself and verify three things: price, timeline and scope. Anything about money and commitments is on you, not the model. If Claude added a number that was not in your brief, remove it.

A useful move: ask Claude to act as a critic. "Read this proposal as a busy client who gets ten of them a day. What raises doubt, where do they stop reading." The answer shows weak spots you cannot see in your own text.

How much time does it save?

Building a proposal from scratch by hand takes an hour or two: structure, wording, proofreading. With Claude the draft is ready in minutes, and your time goes into edits that matter instead of fighting a blank page. Save the prompt in a Claude project and reuse it for each new client, changing only the inputs.

Where to start right now

Open claude.ai, paste your brief and the prompt above, get a first draft, then refine by dialogue. If you want to go through it step by step with examples, we have free materials: the basics in our guides and the first interactive lesson about UNIT, where you build a working artifact with your own hands.

AGINE Academy is an independent product and is not affiliated with Anthropic. Claude belongs to Anthropic.