Most people ask for a pay rise the way they ask for a day off - apologetically, in a corridor, when their manager is half-listening and thinking about something else. Then they are surprised when the answer is a vague "let me see what I can do" that quietly never goes anywhere. A pay rise is a business case, not a favour, and the people who get them treat the conversation as something to prepare for rather than something to survive.
Timing is most of the battle
Ask just after a visible win - a project you led that landed well, a quarter where your numbers stood out, a moment when your manager has clearly noticed your work. Tie the request to the company's budget cycle too; many organisations set pay in a single annual window, and arriving with your case two months before that window opens beats arriving the day after it has closed. Book a proper meeting rather than ambushing your manager between calls. "Could we put thirty minutes in the diary to talk about my role and pay?" gives them time to think and, frankly, time to start lining up the budget.
Build the evidence, not the emotion
"I haven't had a rise in two years" and "the cost of living has gone up" are true and they are also, from a manager's chair, weak. What moves the needle is evidence that your value has grown. Keep a running list through the year - the account you saved, the process you fixed, the work you took on when a colleague left and the role was never backfilled.
Bring market data as well. If Reed and Glassdoor show your role typically paying £42,000 to £50,000 in your region and you are on £38,000, that gap is your argument, framed not as a threat but as a simple "here's where the market sits, and here's what I've delivered". Be specific about the number you want. A manager can act on "I'd like to discuss moving to £46,000"; they cannot do much with "I feel underpaid".
When the answer is no
It might be no, and how you handle that matters more than the no itself. Do not sulk, and do not storm. Ask the genuinely useful question: "What would I need to demonstrate, and over what timeframe, for this to be a yes?" Get specifics, agree a date to revisit it - three or six months, written in an email so it cannot drift - and hold them to it.
If the role consistently pays well below market and the door stays shut despite a strong case, the honest truth is that the fastest pay rise in the UK is usually a new job. Sometimes the conversation's real value is telling you that.