The short version: A promotion is not a gift, it is a budget line someone else set before you walked into the room, so your job is to find out what that number is and beat it with market data, not gratitude. Ask for a specific figure in writing, tie it to the new scope of the role, and never accept the first offer on the day it is made. Most people leave 10 to 15% on the table simply because they were too relieved to be offered the job to fight for the pay that comes with it.
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Worth reading next: How Should You Approach Negotiating Your Salary Before Accepting a Job.
Why a promotion negotiation is not the same conversation as a job offer
When you negotiate a higher salary during a job offer, you have an outside number to point to. You can say another firm offered you £52,000 and this one has to match or beat it. With a promotion there is no outside number. You are negotiating against a budget that already exists inside the company, one that was probably signed off by finance before your manager ever said the word "promotion" to you.
That changes the whole approach. You are not competing with another employer. You are competing with a number that HR set months ago, often to be as low as the business can get away with while still keeping you. Nobody says that part out loud in the meeting, but it is true, and pretending it is not true is why so many people accept the first figure they hear.
Work out your number before anyone mentions one
Do this the week you find out the promotion is coming, not the day of the meeting.
- Pull three to five salary data points for the new title from Glassdoor, LinkedIn Salary, and your industry's professional body (CIPD publishes UK pay benchmarks for HR and management roles, for example).
- Work out the pay gap between your current title and the new one across the market, not just inside your company. If a Marketing Manager averages £42,000 and a Head of Marketing averages £58,000 in your sector and region, that £16,000 gap is your reference point, not whatever your employer happens to offer first.
- List the scope changes in plain terms: how many people will report to you, what budget you will own, what you will be accountable for that you were not before. Write it as bullet points, not a paragraph. You will use this list in the meeting.
- Decide your walk-away number and your target number before you sit down. If you do not decide these in advance, you will accept whatever is said out loud because the moment feels too good to argue with.
A real example: the 8% offer that became 22%
I coached a marketing manager, I will call her Sarah, who was told she was being promoted to Head of Marketing at a mid-sized manufacturing firm. Her manager told her the news over coffee and said, almost as an afterthought, "we're thinking 8% on your base, does that sound fair?" She said yes on the spot. That is the version most people live out.
We caught it before the paperwork was signed. Sarah's current base was £46,000. The 8% offer brought her to £49,680. But the Head of Marketing role she was stepping into had previously been filled by someone earning £62,000, a fact she only found out because a former colleague still worked there and mentioned it over LinkedIn messages. She also had, for the first time, budget sign-off for £180,000 of media spend and three direct reports.
She went back with a written note, not a verbal chat, asking for £57,000, quoting the market range for the title in her region and the scope of the new role. The company came back at £52,000. She held, pointed out the previous postholder's salary again, and settled at £56,000, a 22% increase on her original base rather than the 8% she had already said yes to once. The company had the budget the whole time. They just did not offer it until she asked in writing with numbers attached.
The part nobody likes to say out loud
Here is the uncomfortable bit. Companies promote from within partly because it is cheaper than hiring externally. Recruiting, onboarding, and ramp-up for an external hire at senior level can cost 20 to 30% of the role's first-year salary, according to figures widely cited by recruitment bodies like the CIPD. Promoting you skips almost all of that cost, and a chunk of the saving is quietly kept as company profit rather than passed to you as pay.
That means your manager's first offer is very rarely their ceiling. It is their opening position, dressed up as a done deal because they are hoping your relief and gratitude will stop you asking questions. Being excited in the room is fine to feel. Saying "yes, that sounds great" before you have seen a number in writing is the single most expensive habit in this whole process, and it is the one almost nobody warns you about because it makes the company look calculating rather than generous.
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The script for the actual conversation
When your manager raises a figure verbally, do not accept or reject it in the room. Say something close to this:
- "Thank you, I'm pleased about the new role. Before I confirm anything, can you send the offer in writing so I can look at it against the scope we discussed?"
- Once you have it in writing, reply within two to three working days, not the same afternoon. Speed signals desperation.
- State your number plainly: "Based on market data for this title and the budget and headcount responsibility involved, I'd like us to look at £X rather than £Y."
- Back it with your scope list, not emotion. "This role now includes three direct reports and £180,000 of budget ownership, which is a significant step up from my current accountability."
- Stop talking. Let the silence sit. Whoever speaks first after a number is stated usually gives ground, and it is rarely you if you have prepared.
What to do if they say no, or offer a small compromise
If the answer is a flat no, ask what would need to be true for the number to move in six months, and get that in writing too, ideally as a scheduled review with a specific figure attached, not a vague "let's revisit it." A promise with no date and no number is not a commitment, it is a way of ending an awkward conversation.
If they counter with a smaller rise plus a one-off bonus, treat those as separate conversations. A bonus does not compound; a base salary increase does, because every future rise, pension contribution, and bonus percentage is calculated off your base. Take the smaller ongoing rise over the bigger one-off payment nearly every time.
And if the company cannot move, that is useful information too, not a personal insult. It tells you something about how this employer values internal talent long term. Some people, at that point, start quietly checking what else is out there, and there is nothing wrong with that. Knowing the going rate for flexible or remote roles, whether that is customer service jobs you can do from home, remote data entry work, or even night shift roles that pay a premium, gives you a floor to compare against, even if you have no intention of taking any of them. A negotiation always goes better when you are not desperate for the outcome.
Common mistakes that cost people real money
- Accepting verbally before seeing anything in writing, because the moment feels good and questioning it feels ungrateful.
- Quoting your personal financial needs ("I have a mortgage now") instead of market data and scope. Companies pay for value delivered, not for your bills.
- Negotiating the base salary alone and ignoring pension contribution percentage, bonus structure, and job title, all of which affect your next move's starting point.
- Treating the first number as final because it came from someone senior. Seniority does not mean the number was carefully calculated; often it was set to be low enough to leave room for exactly this negotiation.
- Not asking a single question about how the raise compares to the last three people promoted into similar roles at the company. That question, asked politely, often produces a better number without any further argument.
Frequently asked questions
How much of a raise should I expect with a promotion?
A meaningful promotion, one with new direct reports, new budget ownership, or a clear step up in title, typically comes with a 10 to 20% base salary increase in the UK and US markets. Anything under 8% for a genuine change in scope and accountability is worth questioning with market data before you accept it.
Should I negotiate a promotion salary the same way I would negotiate a new job offer?
No. A job offer negotiation uses an outside employer's number as use against your current one. A promotion negotiation has no outside number, so you have to build your case from market data for the new title and the specific scope of the role, and present it in writing rather than relying on a verbal back and forth.
What if my manager says the budget is fixed and cannot move?
Ask for the fixed figure now plus a written, dated review at three or six months tied to a specific target number, not a vague promise to "revisit it." If there is no movement on base salary, ask about a signing bonus, extra annual leave, a faster review cycle, or a job title upgrade that helps your next negotiation elsewhere.
Is it risky to negotiate after accepting a promotion verbally?
It is far less risky than most people assume. Companies rarely withdraw a promotion because someone asked a reasonable, well-researched question about pay before signing anything formal. The bigger risk is staying quiet and locking in a number that is 10 to 20% below what the role and the market both support.
Useful references
Related reading: How to Ask for a Salary Increase From Your Employer and What to Say When Negotiating Your Salary (The Exact Words That Get You More).
