How to Use AI to Write a Price Increase Letter

Use AI to write a price increase letter and the first draft will almost always bury the number. Models are trained on corporate communication, and corporate communication opens with gratitude, moves through rising costs, and reaches the actual figure in paragraph four. That structure is why price increase letters get forwarded to colleagues with a sarcastic subject line.

The fix is to decide the shape of the increase before you open the model, then force the number into the first two sentences. Below are the three shapes worth considering, the prompt for each, and the one sentence that reliably costs you customers.

Pick the shape before you write anything

A price increase letter is mostly a pricing decision wearing a writing problem. These are the three structures, and they are not interchangeable.

Most small businesses reach for grandfathering because it feels kind. Price the kindness before you commit to it. If you have 200 customers at 40 a month and you grandfather for six months on a rise to 50, that is 12,000 of revenue you have chosen to forgo, and you will have to send the same letter again in six months to the exact people who least wanted to receive it.

How to use AI to write a price increase letter that gets read

The prompt below does three things a default request does not: it puts the number first, it bans the phrases that make the letter sound automated, and it produces a short version you can actually send.

Write a price increase letter to existing customers.

FACTS:
- Business: a two-person bookkeeping practice
- Current price: 180 per month, monthly rolling
- New price: 210 per month
- Effective: first invoice on or after 1 November
- Notice given: 6 weeks
- Reason: software and insurance costs, plus two extra reconciliation checks
  added this year that are not currently priced in
- Cancellation: 30 days notice, no penalty

RULES:
- State the old price, the new price and the date in the first two sentences.
- Maximum 180 words.
- No gratitude opener. Do not start with 'thank you for being a customer'.
- Give one reason, concretely. Do not list three vague ones.
- Do not apologise for the increase. Do acknowledge it is an increase.
- State plainly how to cancel, in one sentence, without softening it.
- Plain English, second person, no marketing adjectives.

Then produce a second version under 80 words for email subject and preview text.

The instruction not to apologise surprises people. Apologising for a price invites a negotiation, because an apology implies the price is negotiable. Acknowledging the increase without apologising for it is the difference between "we are sorry to have to do this" and "this is an increase, and here is what it buys."

The sentence that causes cancellations

Due to rising costs across the industry, we have had to make some changes to our pricing.

Every element of that sentence is a small withdrawal from your credibility. "Due to rising costs" is unfalsifiable. "Across the industry" tells the customer their alternatives are also rising, which they will check and often find untrue. "We have had to" claims you had no choice, which is not true and which the reader knows is not true. "Some changes to our pricing" hides the number.

A model will generate that sentence unprompted, roughly every time, because it appears in thousands of the letters it learned from. Ban it explicitly. The replacement is shorter and does better: "From 1 November your monthly fee goes from 180 to 210."

Give the model your actual voice

The second failure of a default draft is that it sounds like a company ten times your size. If you have been emailing customers in a plain, direct register for years, a sudden shift into corporate tone is itself a signal that something uncomfortable is happening. Paste two or three of your own past emails into the prompt as voice samples. That single step does more than any adjective instruction, and it is the same technique behind getting AI to match your brand voice in any other context.

Before you send it

1. Check your notice period against your own terms. If your terms promise 30 days and you are giving 14, the letter is the least of your problems.

2. Send it to the billing contact and to the person who actually uses the service. These are often different people, and the user hearing it secondhand goes badly.

3. Send it before the invoice, not with it. A price rise discovered on an invoice reads as a mistake and generates a support ticket rather than an acceptance.

4. Have one short answer ready for the customers who ask. Not a discount, an answer. The people who ask are usually staying if you reply within a day.

5. Do not send it to everyone at once if you have more than a few hundred customers. Send to fifty, read the replies, fix the letter, send the rest.

On the terms point: if you sell to consumers rather than businesses, variation clauses and notice periods are regulated territory in most markets. The UK competition regulator's guidance on unfair contract terms is a readable starting point for what a price variation clause can and cannot do, and the underlying principle, that the customer must be able to exit without penalty, is close to universal.

After the letter

Expect a handful of cancellations and do not chase them the same week. The useful follow-up happens six to eight weeks later, when the people who left have discovered what the alternative actually involves, which is the natural moment for a win-back approach. Expect also a small number of public complaints if you are a local business, and have a plan for responding to reviews that does not involve arguing about pricing in a comment thread.

The arithmetic behind all of this, particularly the grandfathering decision, is worked through in more detail in how to raise prices on a subscription product, and the general question of where AI fits in a small operation is covered in the guide to AI for small business.

Frequently asked questions

How much notice should I give?

Whatever your terms say, plus a margin. For monthly services, four to six weeks is normal and comfortable. Less than two weeks reads as a fait accompli regardless of what the contract permits.

Should I explain the reason at all?

One concrete reason, yes. Three vague ones, no. "Our insurance and software costs rose and we added two reconciliation checks this year" is credible. "Rising operational costs" is noise, and noise invites the customer to supply their own explanation.

Can I just put the new price on the next invoice?

You can, and it is the most expensive way to do it. The letter costs an hour. A surprise invoice costs support time, at least one cancellation that would not otherwise have happened, and the assumption that you hoped nobody would notice.

Does the letter need to be personalised per customer?

Only in the numbers. Merge the individual old and new price into each one rather than quoting a percentage, because a customer reading a percentage has to do arithmetic to find out what they will pay, and the arithmetic feels like an obstacle you put there on purpose.