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Price increase email to customers: subject lines, timing and a short example

How to build the email line by line, what to put in the subject, when to send it and a filled-in example. For small businesses that write to customers directly.

The short answer: a good price increase email has a plain subject line with the start date, a first sentence that states the change, a short price list with old and new prices, one true reason, a line for existing bookings, and a way to ask questions. It is short, it is sent before the new price appears on any bill, and it is signed by a real person.

Status: 7 November 2026. A practical guide, not legal advice. All names, dates and prices in the example are invented. Contracts and local rules can affect how and when you may change a price, so check your own situation.

1. The subject line

The subject line has one job: the customer should know what the email is about without opening it, and should not feel tricked once they do. Name your business, say «prices» and give the date. Customers who read only the subject line still get the main fact.

Plain subject lines that work as a pattern:

What to leave out:

Keep it under about sixty characters so it is not cut off on a phone. Use the sender name your customers already know, for example the business name or the owner's name.

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