How much of a raise actually translates to sustained happiness.

Research on income and happiness consistently shows a strong relationship between money and wellbeing up to a threshold — roughly 50,000-75,000 household income in developed countries — after which additional income produces diminishing returns. This doesn't mean money above that level is worthless, but the happiness dividend per extra pound shrinks significantly.

The Kahneman-Deaton 2010 study placed the threshold at around 75,000 for emotional wellbeing. Subsequent research (Killingsworth 2021) found the curve continues more gently above that, especially for people already happy. What everyone agrees on: below the threshold, extra income directly reduces financial stress and buys meaningful life quality. Above it, diminishing returns kick in hard.

For pay rise decisions — especially choices between higher pay vs other benefits (flexibility, commute, work you enjoy) — this matters. A 10,000 raise below threshold can genuinely improve life. The same 10,000 at a 150,000 base produces much smaller happiness improvement and may not justify other trade-offs.

How to use it

Input current income, proposed rise, and the happiness threshold you want to use (the tool defaults to 60,000, a reasonable midpoint of research values). It calculates how much of the rise is below threshold (high happiness value) vs above threshold (diminishing value).

What the result means

The "happiness-weighted value" approximates the actual wellbeing impact of the rise. If most of the rise is below threshold, most of its value translates to real life quality improvement. If most is above threshold, the raise matters more for long-term wealth building than for day-to-day happiness.

Educational behavioural-economics tool. Personal circumstances (debts, dependants, location cost) vary the true threshold for any individual. Not financial advice.

A worked example

Try the defaults: current annual income of 50,000, pay rise amount of 10,000, happiness threshold of 60,000. The tool returns 10,000.00. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.

What moves the number most

The result responds to Current Annual Income, Pay Rise Amount, and Happiness Threshold. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.

The formula behind this

Splits the rise into below-threshold (full happiness value) and above-threshold (weighted at 0.3x per research on diminishing returns) portions. Based on Kahneman-Deaton and Killingsworth research on income-wellbeing relationship. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.

Reading the result without judgement

The figure isn't a scorecard. It's a prompt — something to sit with for a few days before deciding whether any habit needs changing. Reflexive reactions ("I need to cut everything") usually don't last; considered ones do.

What this doesn't capture

Behaviour-adjacent math is always an approximation. Human habits are lumpy and context-dependent; the figure here assumes steady behaviour which is a simplification. Treat the output as a prompt for thinking rather than a precise prediction.