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Turn your payslip into a plan.

Enter what you earn and spend. See where it goes, what it could grow into, and what to do next.

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PayslipMindset
Your payslip · monthly plan

Take-home pay£2,200
Needs 50%£1,100
Wants 30%£660
Future you 20%£440
Future you in 30 years £539,900 £158,400 paid in, the rest is growth · 7% a year, illustrative
Live: drag the slider and your plan updates

From payslip to plan: four free stages

7 steps · about 15 minutes · your progress saves automatically
Calculate~8 min
Learn~3 min

The ideas behind every calculator, in plain English.

Apply~2 min

Three people use the tools on real money decisions.

Prove it~2 min

Check what stuck. Wrong answers link back to the right step.

★ Finish line The PayslipMindset System The full playbook for putting your payslip plan into action. Get the System

Or jump to what you need

Not up for the full path? Start with what matters to you right now.

I'm struggling with money

Get on top of bills, debt and surprises.

I want to build wealth

Make more of what you already earn.

I want to understand investing

The basics, minus the jargon.

The Compound Effect

Where "future you" money
comes from.

You don't need a pay rise to fund it. Small swaps from your take-home pay add up, and compound for decades.

Your next pay rise

Invest half of it before you get used to it.

From your take-home
£200 a month
Could grow to £245,400 in 30 years · £72,000 paid in
Weekly habit

Cook 2 nights instead of ordering in (£40 a week).

From your take-home
£173 a month
Could grow to £212,700 in 30 years · £62,400 paid in
Daily habit

Skip the daily £5 coffee. Invest it instead.

From your take-home
£152 a month
Could grow to £186,600 in 30 years · £54,750 paid in
See 3 more swapsShow fewer
Monthly bill

Cancel one unused subscription.

From your take-home
£15 a month
Could grow to £18,400 in 30 years · £5,400 paid in
Yearly habit

Spend £1,000 less on one holiday a year.

From your take-home
£83 a month
Could grow to £102,300 in 30 years · £30,000 paid in
One-off decision

Buy a £5,000 cheaper car. Invest the difference.

From your take-home
£5,000 once
Could grow to £40,600 in 30 years · £5,000 paid in

All figures: 30 years at a steady 7% a year, illustrative only. Real returns vary.

Built by the PayslipMindset team: independent financial educators and self-taught investors. We don't sell financial products or take commissions, and nothing here is personal financial advice.

Contact

Questions? Get in touch.

Spotted a mistake, have an idea for a new calculator, or need help with The PayslipMindset System? Send us an email.

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Opportunity Cost Calculator

Every pound you spend is a pound that could have been working for you. Move the sliders to reveal the hidden cost of any habit over time.

How this calculator works

Opportunity cost is what you give up by choosing one option over another. Here, it's the difference between spending money now versus investing it. The calculator runs the standard compound growth formula: it takes your recurring spend, assumes it's redirected into an investment earning the return rate you set, and projects the total forward year by year.

The "cost" isn't the money you spent — it's the growth that money never got the chance to earn. That gap widens every year because of compounding, which is why the numbers look small over 1 year and enormous over 30.

Assumption to know: the return rate is a constant, guaranteed-looking number. Real markets don't move in a straight line — some years are up 20%, some are down 15%. The long-run average can still land near the rate you choose, but the path there is bumpy, not smooth.
Your Spending Habit
Future Value if Invested
£0
Invested: £0
Growth: £0
Annual spending
£0
Per day equiv.
£0
Money multiplier
0×
Return on sacrifice
0%
Enter your spending details above to see the true cost of your habits.
Chart shows cumulative spending (dashed) versus portfolio value if that spending were invested instead.
Your Payslip Plan
0 of 5 calculators complete
Next in the path — Step 3
Model the Mindset Shift

The Inflation Eroder

Inflation is a silent tax on idle cash. See how your purchasing power shrinks year by year — and how investing changes the story entirely.

How this calculator works

Inflation doesn't take money out of your account — it quietly reduces what that money can buy. This tool applies the inflation rate you set to your cash balance each year, so you can see the same number lose real-world value even though the balance on the screen never changes. It compares that against the same amount growing in an investment at your chosen return.

The key idea is real return: nominal return minus inflation. Cash sitting in a low-interest account can have a negative real return even while the number on the statement goes up.

Assumption to know: inflation rates vary year to year and by what you're buying (a loaf of bread and a house don't inflate at the same pace). The single rate here is a simplified average, useful for seeing the direction and scale of the effect — not a forecast of any specific year.

Adjust the variables

The Silent Thief
When prices rise, cash earning 0% loses buying power, and that adds up over the years.

Year-by-year purchasing power

Cash real value
—
Invested value
—
Lost to inflation
—
Invest advantage
—
The red line shows how cash loses purchasing power due to inflation. The green line shows how investing grows wealth above inflation.
Your Payslip Plan
0 of 5 calculators complete
Next in the path — Step 5
Learn the 5 Wealth Principles

The Mindset Shift Calculator

One small habit change. See what it's really worth over time.

How this calculator works

This tool compares two paths side by side: your current spending as-is ("Without the shift") against the same income with one extra monthly amount redirected into investing ("With the shift"). Both paths compound at your chosen annual return over your chosen time horizon — only the monthly contribution differs.

The gap between the two lines on the chart isn't the extra money you added — it's that extra money plus everything it went on to earn. That's why a modest £100–£200/month shift can look disproportionately large after 20–30 years: compounding rewards time more than it rewards the size of any single contribution.

Assumption to know: this assumes the extra amount is invested consistently every month for the full time horizon, at a steady return, with no withdrawals. Life rarely goes that smoothly — job changes, emergencies, and market downturns will all interrupt the line in practice.
Step 1 — Your Numbers
500
Step 2 — Make the Shift
How much more could you invest?
Without the shift

£0
—
With the shift

£0
—
The difference
£0
in extra wealth from one decision
The green line shows wealth growth with the redirected savings. The red line shows current trajectory. The gap between them widens exponentially over time.
Small cuts, massive compounding. Redirecting even a modest amount monthly into investments doesn't just add — it multiplies. Each pound earns returns, and those returns earn returns. The gap between the two paths widens exponentially over time. The shift itself is free. Waiting can cost more than it looks.
Your Payslip Plan
0 of 5 calculators complete
Next in the path — Step 4
See the Inflation Eroder

The 50/30/20 Budget Rule

Split your take-home income into needs, wants, and savings — then compare your real spending to the recommended split.

How this calculator works

The 50/30/20 rule is a budgeting guideline, not a law: 50% of take-home pay to needs (rent, bills, groceries), 30% to wants (eating out, subscriptions, hobbies), and 20% to savings and debt repayment beyond the minimum. This calculator takes your actual income and spending and shows how your real split compares to that target.

It's a starting point, not a scorecard. If you live somewhere with high rent, your "needs" share will legitimately be higher than 50% — the value is in seeing the gap and deciding what, if anything, to adjust.

Assumption to know: the 20% savings figure assumes no high-interest debt. If you're carrying credit card debt above roughly 15–20% APR, paying that down usually beats investing the difference, since you're guaranteed to "earn" the interest rate you stop paying.
Budget Breakdown
Needs (rent, bills, groceries) 50%
Wants (dining, subscriptions, hobbies) 30%
Investments & savings 20%
Total split: 100%
Your actual monthly spending (optional)
Recommended Needs / Wants / Savings
£0 / £0 / £0
Income £0
Split 50/30/20
Needs vs actual
—
Wants vs actual
—
Savings vs actual
—
Total actual spend
£0
Enter your income to see your personalised breakdown.
Tip: Enter your monthly income above to generate your recommended 50/30/20 split.
Your Payslip Plan
0 of 5 calculators complete
Next in the path — Step 2
See the trade-off — Opportunity Cost

5 Timeless Wealth Principles

Five principles behind most long-term financial plans. Click each card to see how they apply in real life.

Next in the path — Step 6
See these ideas applied to real decisions

Real-Life Scenarios

Sliders and formulas are abstract until they're attached to an actual decision. Here are three people using the ideas from this site to make real trade-offs.

Priya, 28 — £32,000 salary, renting in Manchester
Decision: pay off a small loan faster, or start investing now?
Priya has £3,000 left on a car loan at 8% APR, and £150 a month she could put toward either extra loan repayments or a stocks & shares ISA. Her Opportunity Cost Calculator run showed that £150/month invested at 7% for 10 years could grow to roughly £26,000. But her loan is costing her 8% guaranteed, every year, on the remaining balance — higher than her expected investment return.

Using Principle 4 (Protect Your Downside) alongside the numbers, she paid off the loan first, then redirected the same £150/month into investing once it was cleared — capturing the guaranteed 8% "return" before chasing the uncertain 7%.
Loan rate: 8% APR Alternative: 7% expected return Principle used: Protect Your Downside
Daniel, 41 — £58,000 salary, two kids, a mortgage
Decision: a modest lifestyle upgrade, or closing the retirement gap?
Daniel got a £200/month pay rise and was ready to upgrade his car lease. Before deciding, he ran the Mindset Shift Calculator with his real numbers: redirecting that same £200/month into his pension for the 24 years until retirement, at 7%, projected to roughly £150,000 more than his current trajectory — while his take-home spending stayed exactly the same.

He didn't cut anything he already had. He just decided where the new money would go before it became a habit — Principle 1, Pay Yourself First, applied to a pay rise instead of a paycheck.
Extra income: £200/mo Time horizon: 24 years Principle used: Pay Yourself First
Amara, 24 — first job, £26,000 salary
Decision: keep £4,000 in a current account, or actually use it?
Amara had £4,000 sitting in a current account paying no interest, "just in case." Using the Inflation Eroder, she saw that at 3% inflation, that £4,000 would be worth roughly £2,970 in real purchasing power after 10 years of sitting still — a loss of over £1,000 without spending a penny.

She split it: 3 months of expenses (about £2,400) went into a high-yield savings account as her emergency fund — Principle 4 in practice — and the remaining £1,600 went into a long-term investment account, since she wouldn't need it for years.
Starting cash: £4,000 Inflation used: 3%/yr Principle used: Protect Your Downside
Next in the path — Step 7
Test what you've learned

Net Worth Tracker

Add up what you own, subtract what you owe. Net worth is the one number that shows whether you're actually building wealth over time — update it every few months and watch the trend, not any single number.

How this works

Net worth is assets minus liabilities — everything you own with real value, minus everything you owe. It isn't your salary and it isn't your bank balance; a high earner with heavy debt and no savings can have a lower net worth than a modest earner who saves consistently.

This tool recalculates as you type and remembers your entries in this browser, so you can come back and update it rather than starting over each time.

Assumption to know: the figures here are whatever you enter — this tool doesn't fetch live account balances or asset prices. Property and investment values are only as accurate as your last valuation or statement.
Assets & Liabilities
Saved
What you own
What you owe
Net Worth
£0
Assets £0
Liabilities £0
Add your assets and liabilities above to see your net worth.
Your Payslip Plan
0 of 5 calculators complete

Knowledge Quiz

15 questions on financial literacy. Can you ace it?

Question 1 of 15
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★ Final step · you've finished all 4 free stages

Turn this into a plan for your own payslip

The PayslipMindset System is the step-by-step playbook for applying everything you've just learned to your income, debts and savings.

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Learn: Guides & Glossary

The topics the calculators don't cover, in plain English — plus a glossary and answers to the questions people actually ask.

7 guides · read in order the first time, or jump to what you need UK figures · 2026/27 tax year
Emergency funds: your financial safety netHow much cash to hold, where to keep it, and what it's actually for.

What it's for

An emergency fund is cash that stops a bad month turning into debt. It's for things you didn't plan for and can't put off: losing your job, a broken boiler, an urgent car repair, a vet bill.

It's not for holidays, Christmas or a new phone. Those are planned costs, so save for them separately.

How much

The common guideline is 3–6 months of essential spending. That means rent or mortgage, bills, food, transport and minimum debt payments, not everything you spend.

  • Aim nearer 6 months if your income varies, you're self-employed, or your household relies on one income.
  • 3 months can be enough if your job and income are very stable.

Where to keep it

  • An easy-access savings account, separate from your current account so it's not easy to dip into.
  • Not invested. Investments can fall at exactly the moment you need the money.
  • UK bank and building society savings are protected up to £120,000 per person, per banking licence by the FSCS.

How to build it

  1. Start with a starter fund, such as £1,000 or one month's essentials. That's enough to cover most surprises.
  2. Set up a standing order on payday, so it builds without you thinking about it.
  3. Once any expensive debt is cleared, build it up to your full 3–6 month target.

When you use it

Use it without guilt, because that's its job. Then pause any extra investing for a while to refill it.

Not sure what your essentials add up to?
Debt: which to clear first, and when to invest insteadExpensive vs cheaper debt, repayment order, and a simple priority list.

Not all debt is the same

  • Expensive debt includes credit cards, overdrafts, store cards, payday loans and missed buy-now-pay-later payments. Rates are often 20–40% APR or more. Clearing it is a guaranteed saving that's hard to beat.
  • Cheaper, structured debt includes a mortgage and low-rate car finance. These have lower rates and fixed repayments, so there's usually no rush to overpay them ahead of everything else.
UK student loans (Plan 2 and 5) are different. You repay 9% of your earnings above a threshold, automatically through your payslip. Anything left is written off after a set period (30 years for Plan 2, 40 for Plan 5). Many people never repay in full, so overpaying often doesn't help. It works more like a graduate tax. Check your plan type before overpaying.

What order to pay debts off

Always pay the minimum on everything first. Then put any extra towards one debt at a time:

  • Avalanche: the highest rate first. This saves the most money.
  • Snowball: the smallest balance first. It costs a bit more, but early wins keep you going.

Pay off debt or invest?

If a debt's rate is higher than the return you'd realistically expect from investing (long-run averages are often quoted at around 5–8% for diversified funds), paying it off usually wins. A simple order that works for most people:

  1. Build a small starter emergency fund.
  2. Pay enough into your pension to get the full employer contribution. It's part of your pay (see guide 3).
  3. Clear expensive debt, highest rate first.
  4. Build your full emergency fund.
  5. Invest for the long term through an ISA or pension (see guide 4).
Struggling with repayments? StepChange, National Debtline and Citizens Advice give free, confidential debt help. Avoid paid "debt management" firms that charge fees for the same thing.
See what a debt is really costing you.
Pensions & employer contributionsAuto-enrolment, tax relief, salary sacrifice, and why the employer's share matters.

Auto-enrolment: the basics

If you're employed, aged 22 or over and earn more than £10,000 a year, your employer must put you in a workplace pension. The legal minimum is 8% of your qualifying earnings (earnings between £6,240 and £50,270 a year):

  • at least 3% from your employer
  • the rest (5%) from you, including tax relief

The employer contribution is part of your pay

Your employer only pays in if you do. Opting out, or paying in less than your employer will match, means turning down money they've offered you. It's effectively a pay cut. Many employers pay more than the minimum if you raise your own contribution (for example, matching up to 5% or 6%), so check your staff handbook or HR portal.

Tax relief

Money you pay into a pension gets tax relief, so £80 from you can become £100 in your pension. It reaches you in one of two ways:

  • Relief at source: your provider claims 20% from the government and adds it. Higher-rate taxpayers claim the rest through Self Assessment, and many never do.
  • Net pay: your contribution is taken before income tax, so you get full relief straight away.

Salary sacrifice

You give up part of your salary, and your employer pays it into your pension instead. You save income tax and National Insurance, and some employers add their NI saving too.

  • From April 2029, the NI saving will only apply to the first £2,000 sacrificed each year. Income tax relief isn't affected.
  • A lower official salary can affect mortgage applications and some benefits, so check before making it large.

The catch: access

Pension money is locked until the minimum pension age. That's currently 55, rising to 57 from April 2028. That's why it's best for long-term money, alongside an ISA for goals before then.

Check your own payslip

Look for your pension deduction, and check your provider's app for the employer's contribution. Lost track of an old pension? Use the free GOV.UK Pension Tracing Service.

See what a small increase in your pension contributions could grow into.
ISAs & investing accounts: where to hold your moneyCash ISA, Stocks & Shares ISA, Lifetime ISA and taxable accounts compared.

The account you use (the "wrapper") decides how your savings and growth are taxed. It doesn't change what you invest in.

ISAs: £20,000 a year, tax-free

You can pay up to £20,000 into ISAs each tax year (6 April to 5 April), split however you like. Growth and withdrawals are completely tax-free. Unused allowance doesn't carry over.

  • Cash ISA: tax-free savings. From 6 April 2027, under-65s can put at most £12,000 of the £20,000 into cash ISAs.
  • Stocks & Shares ISA: tax-free investing, usually in funds. Best for money you won't need for 5+ years, because the value can fall.
  • Lifetime ISA: open it aged 18–39 and pay in up to £4,000 a year, and the government adds a 25% bonus (up to £1,000). It's only for a first home costing up to £450,000, or for after age 60. Other withdrawals cost 25%, which is more than the bonus. The government plans to replace it with a First-Time Buyer ISA from April 2028, so check the latest before opening one.

General investment account

There's no limit, but also no tax shelter. Growth and dividends above your yearly allowances can be taxed. Most people only need one after they've used their ISA allowance.

ISA or pension?

A pension gives you tax relief now and your employer's contribution, but the money is locked until 57. An ISA is flexible and you can use it any time. Most people benefit from both, in this order:

  1. Pension up to the full employer contribution
  2. ISA for goals in the next 5–15 years, and extra pension for retirement
  3. A general investment account once your ISA allowance is used
See how the same monthly amount grows over time.
When your income goes upAvoid the "I earn more but have nothing more to show for it" trap.

The trap: lifestyle creep

When income rises, spending quietly rises to match: a nicer car, more takeaways, pricier subscriptions. None of it feels like a big decision, but a year later you earn more and save exactly the same.

1. Know the real number

A £3,000 pay rise isn't £3,000 more in your account. After income tax, National Insurance, student loan and pension deductions, a basic-rate taxpayer might see take-home rise by roughly £150–£180 a month. Plan with that figure. Above £50,270 you pay the higher 40% rate (thresholds differ in Scotland). Between £100,000 and £125,140, your tax-free allowance shrinks, so extra pension contributions there save unusually large amounts of tax.

2. Decide the split before it arrives

Pick a rule before your first bigger payslip. For example: half goes to your future (pension, ISA or debt) and half is yours to enjoy. You still feel the rise, and your future gets real momentum.

3. Automate it the same month

Raise your pension percentage or your ISA standing order before the new money lands in your account. Money you never see in your current account is easy not to spend.

4. Upgrade on purpose

Choose one or two things that genuinely improve your life, and let the rest stay the same. Deciding what to upgrade is very different from drifting into spending more.

Use the same approach for bonuses and windfalls.

See what investing half of a pay rise could grow into.
What actually affects my credit score?What UK lenders look at, and when it really matters.

In the UK, the main factors credit reference agencies weigh are:

  • Payment history — paying on time, every time, matters most.
  • Credit utilisation — using a small percentage of your available credit limit looks better than maxing it out, even if you pay it off monthly.
  • Length of credit history — older accounts in good standing help.
  • Types of credit and how often you apply — lots of applications in a short window can look risky.

A good score isn't a badge of honour — it mainly determines the interest rate you're offered on future borrowing, so it matters most right before you need a mortgage or loan.

How do I think about risk before I invest anything?Volatility, time horizons, and what the calculators can't predict.

Every calculator on this site uses a single steady return rate to make the maths visible — real markets don't behave that way. Two things worth internalising before you invest anything:

  • Volatility isn't the same as loss. A diversified investment can drop 20–30% in a bad year and still recover over time — but only if you don't sell during the drop.
  • Time horizon determines appropriate risk. Money you need within 1–3 years generally shouldn't be in the stock market at all; money you won't touch for 10+ years has more room to ride out volatility.

This site's calculators are for building intuition about compounding, not for predicting your actual future balance.

Figures checked against GOV.UK, FSCS and HM Treasury announcements for the 2026/27 tax year. This is general guidance, not personal financial advice.

Compound interest
Interest calculated on both your original amount and all the interest it has already earned — the reason growth accelerates over time instead of staying flat.
Opportunity cost
What you give up by choosing one option over another — here, the investment growth you miss out on by spending instead of investing.
Inflation
The general rise in prices over time, which reduces how much a fixed sum of money can buy in the future.
Real return
Your investment return after subtracting inflation — the actual growth in what your money can buy, not just the number on the statement.
Index fund
A fund that holds a broad basket of companies (e.g. the whole FTSE 100 or S&P 500) rather than betting on individual stocks, spreading out risk.
Diversification
Spreading money across many different investments so that no single one failing can seriously damage your overall position.
Asset
Something that can put money in your pocket over time — a dividend-paying investment, rental property, or interest-bearing account.
Liability
Something that takes money out of your pocket over time — a car loan, credit card balance, or any debt with ongoing payments.
ISA
Individual Savings Account — a UK account where investment or savings growth is entirely tax-free, up to an annual contribution limit.
APR
Annual Percentage Rate — the yearly cost of borrowing (or, for savings, the yearly return), including most fees, expressed as a single percentage.
Emergency fund
Easily accessible cash set aside to cover unexpected costs or income loss, typically 3–6 months of essential expenses.
Volatility
How much an investment's value moves up and down over time — higher volatility means bigger swings in either direction, not necessarily a worse long-run outcome.
"Investing is basically gambling."

Picking individual stocks and trying to time the market has a lot in common with gambling. Buying a broad, diversified index fund and holding it for decades is a fundamentally different activity — you're not betting on one outcome, you're taking a share in the long-run growth of the entire economy. It can still lose value in any given year; that's risk, not the same thing as a coin flip.

"I need to be rich to start investing."

Most UK investment platforms let you start with £25–£50 a month. The Mindset Shift calculator on this site is built specifically to show that the amount matters far less than starting early — a small, consistent contribution outperforms a larger one that starts a decade later.

"I should pay off all debt before investing anything."

It depends on the interest rate. High-interest debt (credit cards, some personal loans) usually should be cleared first — see the debt order guide above. But low-interest debt like some student loans or a mortgage often isn't worth rushing to clear ahead of investing, since the guaranteed "return" from paying it off early is lower than realistic long-run investment returns.

Are the growth figures on this site guaranteed?

No. Every calculator uses a steady rate you choose to make the effect of compounding easy to see. Real investment returns vary year to year and are never guaranteed — see the Methodology note in the footer for more detail on what's assumed and what isn't.