What this checker works out
This checker compares how fast your income has grown against how fast your spending has grown, and shows what happened to your monthly surplus in between.
Lifestyle inflation is spending rising to absorb a pay rise. It is not a moral failing and some of it is entirely reasonable — the question is whether it consumed all of the increase, or only part of it.
Compare then and now
Before you compare
- Use take-home pay for both periods, not gross salary.
- Compare like with like: the same months of the year where possible, since seasonal spending distorts short comparisons.
- Include everything in spending, including saving into goals and any new committed costs such as a larger mortgage.
- Choose a gap long enough to be meaningful — a year or more rather than two months.
Spending more after a pay rise is reasonable if it was a deliberate choice and the surplus still grew. It becomes a problem when spending rises faster than income, because the household ends up with a higher income and less financial resilience than before.
How this calculator works
Two growth rates and two surpluses:
Income growth % = (new income − old income) ÷ old income × 100
Spending growth % = (new spending − old spending) ÷ old spending × 100
Surplus = income − spending, for each period
Creep = spending growth − income growthA creep figure above ten percentage points returns a verdict of likely lifestyle inflation. That threshold is a judgement, not a finding — the surplus figures underneath it are the more reliable signal, because they are actual money rather than a ratio.
Worked example: a substantial pay rise
Using the default figures — income from £2,000 to £2,800 a month, spending from £1,600 to £2,500:
- Income growth: 40.0%
- Spending growth: 56.25%
- Old monthly surplus: £2,000 − £1,600 = £400
- New monthly surplus: £2,800 − £2,500 = £300
- Creep: 16.25 percentage points — lifestyle inflation likely
An £800 monthly pay rise has produced £100 a month less to save. Every pound of the increase was absorbed, and then some. The household feels considerably better off — and is measurably less resilient than before, which is the specific failure this check exists to surface.
Common mistakes
- Comparing gross salaries. Tax and National Insurance take a larger share of a higher income.
- Comparing dissimilar months. December against June measures the season, not the trend.
- Treating all increased spending as waste. Some is a legitimate improvement in quality of life.
- Excluding new committed costs. A larger mortgage or car finance payment is spending.
- Only checking after several years. The creep is easiest to correct while it is small.
Frequently asked questions
How much of a pay rise should I save?
A frequently suggested approach is to save at least half of any increase before adjusting your spending at all, which lets your standard of living rise while your savings rate rises too. The specific proportion matters less than doing it immediately — money never seen in the current account is far easier to save than money reclaimed later.
Is lifestyle inflation always bad?
No. Spending more on housing, childcare or health as circumstances change is often sensible, and a pay rise that buys back time or reduces stress can be excellent value. The problem is the unexamined version, where a household ends up earning considerably more with no more security than before.
How do I stop it happening?
Automate the saving on the same day the rise takes effect. Increase your pension contribution or a standing order to savings by a set share of the increase before the higher net pay reaches your current account. Anything requiring a monthly decision tends to erode.
What if my spending rose because of inflation rather than choice?
That is worth separating out. If prices rose 8% and your spending rose 10%, only two percentage points are lifestyle inflation. The Inflation Impact Calculator will show what general price rises would have done to the same basket, which lets you see how much of the increase was genuinely yours.
Is what I enter stored?
No. Income and spending figures are processed in your browser and never transmitted or retained.
Related tools
References
- MoneyHelper — guidance on budgeting, saving and managing a change in income
- Office for National Statistics — official statistics on earnings growth and household spending
Sources are checked at publication and can change — how I choose and check references.