How to Define Your Brand Tone of Voice Using Brand Psychology

Open your company inbox. Then your Instagram profile. Then the last quote your sales rep sent out. It reads like three different businesses. The website sounds like a solicitor’s letter, the social posts are all emojis and exclamation marks, and the quote is a wall of copy-pasted technical specs without a single word that sounds like you. The real problem sits upstream of the design. Nobody ever decided how your company talks.

Research on brand consistency estimates that brands presenting themselves the same way across every channel see revenue growth of 10% or more, and that while 85% of companies have brand guidelines, fewer than a third actually stick to them.¹ Tone of voice is where that inconsistency shows up first, and where it costs you most. What follows is a method for pinning it down and, more importantly, for getting the people who write on your behalf every day to follow it.

What tone of voice is (and why it’s more than “how you write”)

Your company’s tone of voice is the set of stable choices that shape how it speaks: which words it uses, how formal it gets, how much it jokes, how it delivers bad news, how it chases a payment. It’s your brand’s personality turned into language, and it should be recognisable whether someone is reading an email, a post or a printed brochure.¹

Voice is the part that stays fixed. Tone shifts with the channel and the moment, the same way your own voice stays yours whether you’re trading jokes with a friend or offering condolences. Linguist Judy Delin, writing in the Journal of Applied Linguistics, framed “brand tone of voice” as a serious field of study years ago,² yet in small businesses it’s still the thing everyone takes for granted and nobody writes down. So each person fills the gap with their own taste.

A consistent voice matters more than your logo

People glance at your logo for a second. They read your words for minutes, every day, at every touchpoint. Trust gets built on those words, and for a small business trust is revenue.

The numbers make it concrete. Around 80% of millennials prefer to buy from brands they trust, 40% of Americans never go back to a brand once they’ve lost trust in it, and 87% say they’d pay more for products from companies they consider trustworthy.³ A clear, steady voice helps customers recognise you and trust you, because they know what to expect before they’ve read a word.³ Now flip it. If your website promises craftsmanship and warmth, and then your phone system’s automated reply sounds like a 1988 post office, the promise cracks. Trust builds slowly and breaks on one off-key sentence.

That consistency is also what links your voice to the way you carry it into a sales conversation. A tone of voice that matches your sales pitch is what makes you sound like the same company when a customer goes from your post to a phone call with your rep.

Your brand’s personality picks the words before you do

Before you choose adjectives, decide who the brand is. In brand management this is called the personality approach, one of seven schools of thought mapped by Tilde Heding, Charlotte Knudtzen and Mogens Bjerre at Copenhagen Business School. It’s rooted in cognitive psychology and in the idea of congruence with the customer’s self-image.⁴ Put simply, people choose brands that talk the way they’d like to talk.

Words work through what they mean and through how they sound. A University of Dundee study published in Psychology and Marketing tested 25 made-up brand names across three experiments and found that names with voiced consonants such as b, d, g, z and v come across as harsher, while names with voiceless consonants such as p, t, k, s and f sound softer and gentler.⁵ The study was about names, but the principle applies every time you pick a word. If you sell skincare, “gentle” and “light” will do more for you than “robust” and “aggressive”, even when the meaning is close. Sound lands before reasoning does.

How to choose your brand archetype without copying Apple

An archetype is a recognisable character that gives your voice a direction. The Trusted Expert speaks in data and plain explanations. The Rebel challenges convention with short, sharp sentences. The Friend is on first-name terms and puts you at ease. The Ruler projects authority and control. The point is to stop improvising. Once you know your brand is “the Expert who explains things without making you feel stupid”, you already know a sarcastic quip on LinkedIn doesn’t belong.

There’s a quick test for choosing one. Pull up the ten best messages you’ve already written, the ones that actually won you a customer, and ask which character comes through. Brand personality can be spotted, measured, and it builds congruence with whoever’s reading.⁴ Watch out for two mistakes. The first is the aspirational archetype: picking the Rebel because it sounds cool when your plumbing and heating firm is, in practice, a reassuring Expert. Customers can smell the stretch. The second is settling on just one. You’ll get further with a primary archetype that drives 80% of your messages and a secondary one that steps in at the right moments, say the Friend softening the Expert when you’re answering a complaint.

The four tone dimensions, plus a worksheet to fill in

An archetype sets the course, but if you want a receptionist or an outside supplier to write well, you need something more hands-on. Place your tone on four dimensions and give each a score from 1 to 5.

• Formal ↔ casual. “Dear Mr Smith” or “Hi John”? “Kind regards” or “Speak soon”?
• Serious ↔ funny. Do we allow ourselves jokes and wordplay, or keep it dry?
• Respectful ↔ irreverent. Do we treat the subject with deference or poke at it?
• Enthusiastic ↔ matter-of-fact. Exclamation marks and energy, or measured and practical?

Fill in the worksheet with a number per dimension and, next to it, a few words explaining the choice. “Casual: 4, because our customers are tradespeople like us, not executives.” This grid becomes the measurable core of the document. It’s what lets you tell a writer “this post is too enthusiastic, we’re a 2 on that scale, not a 5”. Without numbers, feedback is just personal taste, and you can’t teach taste.

Your tone of voice document fits on three pages

Forget the fifty-page brand book big corporations produce. A small business needs a document a new hire can read in ten minutes and put to use that same afternoon. Any brand guidelines document has to cover the essentials, and tone of voice is one of them.¹ Keep it to three pages.

Page 1: who we are when we speak. Primary and secondary archetype, the four dimensions with their scores, and three adjectives that describe the voice (for example “practical, warm, no fluff”).

Page 2: the working rules. A “say this, not that” list. We use first names. No unexplained jargon. Bad news comes before the fix. Sentences under twenty words. Five words that are ours and five that are banned.

Page 3: examples. Two or three before/after pairs taken from your real channels. Examples beat principles every time, because people copy models far more readily than they absorb theory.

For the first draft you can use AI to speed things up, once you’ve made the decisions yourself. Paste your ten best messages into ChatGPT or Claude and ask:

“Analyse these ten pieces of writing from my company. Identify the recurring traits of our tone of voice on four dimensions: formal/casual, serious/funny, respectful/irreverent, enthusiastic/matter-of-fact. For each dimension, give a score from 1 to 5 and quote the sentence that shows it. Then list 5 recurring words that sound like ‘us’ and 3 that feel off. Don’t invent anything that isn’t in the texts.”

Treat the output as a starting point to edit. The voice is still your call.

The same small business, before and after, on three channels

Take a realistic case. Rossi Plumbing & Heating, based in Brescia, fifteen staff, archetype Trusted Expert with the Friend as secondary, casual but matter-of-fact.

Email replying to a quote request. Before: “With reference to your kind enquiry, please find attached the quotation as per the above subject. We look forward to your courteous reply.” After: “Hi Marco, here’s the quote for the boiler. I’ve included disposal of the old one too, so that’s one less thing for you to sort. If anything’s unclear, just give me a call and I’ll talk you through it in two minutes.”

Social post. Before: ”🚀 Revolutionise your comfort with our innovative, cutting-edge solutions! Contact us now!” After: “November, first frost, and the boiler cuts out. It always happens at the weekend. That’s why we keep an engineer on call on Saturdays. If yours leaves you in the cold, we’ll be with you the same day.”

Website page. Before: “A leading company in the plumbing and heating sector, we offer an all-round service with professionalism and reliability.” After: “We’ve been installing and repairing boilers in Brescia for twenty years. We tell you upfront what it’ll cost, how long it’ll take and what happens if something goes wrong.”

Spot the common thread. One brand, three channels, a single voice. That’s what customers recognise, and it’s what keeps the tone consistent in the copy on every page and in the storytelling you use in your proposals.

Getting the people who actually write to use it (team, suppliers and AI)

In a small business, the best document in the world is useless if the owner writes on Sunday, the office manager on Monday and an outside agency on Tuesday. Tone has to be taught, methodically. Here’s how to make it stick.

Your own people. Have them read the three pages, then run a thirty-minute exercise. Hand them three old pieces of writing and ask them to rewrite each one using the worksheet. People learn by rewriting far more than by listening. When you give feedback, skip the vague “I don’t like it” and tie it to the worksheet with specifics, for example “it’s too formal, we’re a 2 on formality, see the example on page 3”.

Outside suppliers. Attach the three pages to every brief, before the first delivery. A serious copywriter will ask for them. One who doesn’t is making up a voice for you as they go.

AI. This is where the document becomes a multiplier. A study published in the Journal of Product & Brand Management, an experiment with 624 participants using marketing copy, found that text labelled as AI-generated isn’t seen as less authentic than text written by a person, and that disclosing AI use harms neither the authenticity of the voice nor attitudes towards the brand.⁶ You can use AI without embarrassment, as long as you hand it your rules. Paste your document into ChatGPT or Claude and use it as a standing instruction for every piece of writing:

“You’re the copywriter for Rossi Plumbing & Heating. Always follow these tone rules: [paste the three pages]. I’m going to give you a badly written text. Rewrite it according to the rules, keep all the technical information intact, and don’t add enthusiasm the rules don’t call for. At the end, list which rules you applied.”

The process is yours, and AI speeds it up. Without the document, AI hands you the average voice of the internet, and that voice belongs to nobody.

The yearly check-up

Tone gets written once and then forgotten, and that’s when the chaos creeps back. Remember that fewer than a third of companies with guidelines actually follow them?¹ The fix is a check-up booked in the calendar: once a year, half a day.

Answer four questions. Has the business changed (new services, new prices, new positioning)? Has your audience changed (are you talking to the same customers as a year ago)? Have new channels appeared that you haven’t written rules for (WhatsApp Business, a video channel)? Rereading your last twenty messages, do you hear the voice from the document, or has it already drifted? If three of the four answers are “yes, it’s changed”, update the three pages. If not, sign them off and move on. Half a day a year, against a brand that slides back into sounding like three different companies.

Sources

Further reading

• Communication psychology for small businesses: a practical guide

Footnotes

1. Building Brand Consistency Across Channels. marketingcommunications.wvu.edu ↩ ↩² ↩³ ↩⁴

2. Brand Tone of Voice. doi.org ↩

3. What Is Brand Trust and Why It’s Your Most Valuable Asset. imcprofessional.medill.northwestern.edu ↩ ↩²

4. Brand Management: Research, Theory and Practice. books.google.co.id ↩ ↩²

5. How voiced consonants in a brand’s name can alter its perceived … discovery.dundee.ac.uk ↩

6. To disclose or not disclose, is no longer the question – effect of AI-disclosed brand voice on brand authenticity and attitude. emerald.com ↩