Welcome to NOXEN — the intelligence and education platform for the next generation. This week: the gap between what school teaches and what you actually need to know — and why that gap exists in the first place.
Thirteen years of compulsory education. Not one lesson on tax, mortgages, investing, negotiating, or how businesses actually work.
Think about the things you use every day as an adult. Your payslip — do you understand every deduction on it? Your credit score — do you know what moves it up or down? Your pension — do you know what it's invested in? Your tax return — could you file one without help?
Most adults cannot confidently answer yes to all of these questions. And most adults received more than a decade of compulsory education before those questions became relevant to their lives. The two facts are connected.
The curriculum that governs what is taught in British schools has undergone many revisions over the decades. Financial literacy — in any meaningful form — has never been a core component. Basic personal finance was added to the secondary maths curriculum in England in 2014, but in a limited form, often untaught in practice, and nowhere near sufficient to prepare young people for the financial decisions they will face within years of leaving school.
This issue is about that gap. What it contains, why it exists, and what you can do about it.
Most people enter their first job with no understanding of how income tax or National Insurance work. They see money taken from their pay and accept it, because nobody ever explained the system to them.
In the UK, income tax is paid at 20% on earnings between £12,571 and £50,270 (the basic rate), 40% on earnings from £50,271 to £125,140 (the higher rate), and 45% above £125,140 (the additional rate). The first £12,570 of income is a personal allowance — tax-free. These thresholds are set by the government each year and can change.
National Insurance is a separate deduction, contributing to your entitlement to the State Pension and certain benefits. Employees pay 8% of earnings between £12,570 and £50,270, and 2% above that threshold. Employers also pay National Insurance on top of your salary — a cost that affects how much businesses can afford to pay you, even if you never see that figure on your payslip.
Understanding your tax code matters. The most common tax code is 1257L, which reflects the standard personal allowance. If your code is wrong — which happens more often than most people realise — you may be overpaying tax without knowing it. HMRC does not automatically correct this. You have to check.
Check your tax code on your payslip and verify it on the HMRC website. If you have changed jobs, had multiple jobs, or received any benefits in kind (private healthcare, company car, etc.), your code may be incorrect. Overpaid tax can be reclaimed, but you have to initiate the process.
Credit underpins much of adult financial life — mortgages, car finance, credit cards, overdrafts, phone contracts. Yet most people leave school without understanding what a credit score is, how it is calculated, or what affects it.
In the UK, the main credit reference agencies are Experian, Equifax, and TransUnion. They each hold a file on you that lenders use to assess how likely you are to repay borrowed money. Your score is influenced by your payment history, how much credit you are using relative to your limits, how long your credit accounts have been open, how many recent applications for credit you have made, and whether you are on the electoral roll.
A missed payment — even on a small bill — can remain on your credit file for six years and affect your ability to obtain a mortgage, a car loan, or even a mobile phone contract on a good rate. Many people discover this for the first time when they apply for their first mortgage and are refused, or offered a significantly worse rate than they expected.
A credit card balance of £3,000 at 24% APR, repaid at the minimum monthly payment, takes approximately 27 years to clear and costs over £5,000 in interest alone. The same £3,000 invested at 7% annual return for 27 years would be worth approximately £18,600. The gap between those two numbers — roughly £23,600 — is what understanding compound interest versus compound debt means in practice.
For most people, a mortgage will be the largest financial commitment of their life. It is also one of the least understood. School never covers it.
A mortgage is a loan secured against a property. The key terms: the loan-to-value ratio (LTV) is the percentage of the property's value you are borrowing. A 90% LTV mortgage means you have a 10% deposit. Lenders charge higher interest rates for higher LTV mortgages, because they carry more risk. The difference between a 90% LTV and a 75% LTV mortgage can be more than one percentage point in interest rate — which on a £250,000 mortgage over 25 years is tens of thousands of pounds.
Mortgages come in two main types: repayment (where each monthly payment reduces the outstanding balance) and interest-only (where monthly payments cover only the interest, and the full balance remains at the end of the term). Most residential mortgages are repayment mortgages. Interest-only is more common in buy-to-let arrangements.
The word "investing" carries connotations of complexity, wealth, and risk that put most people off engaging with it. School does nothing to correct this. The reality is considerably more accessible.
An Individual Savings Account (ISA) allows UK residents to invest up to £20,000 per year in stocks and shares (or cash, or other assets) completely free of UK income tax and capital gains tax on any returns. Returns on a stocks and shares ISA — including dividends and price growth — are yours to keep in full, regardless of their size.
A global index fund tracks the performance of a broad basket of companies across the world. The most commonly cited benchmark is something like a global all-cap index, which includes thousands of companies across developed and emerging markets. Historically, diversified global equity markets have delivered average annual returns of around 7% to 9% over long periods, before inflation. Past performance does not guarantee future returns — but this is the best evidence available for how equities have performed over time.
£200 invested monthly in a global index fund from age 22, at a 7% average annual return, produces approximately £655,000 by age 65. The total amount contributed is £103,200. The remaining £551,800 is returns — money generated by money, not by working. This is compounding. It requires no expertise. It requires starting.
The ability to negotiate is one of the highest-value skills in professional life. It is also one of the least taught. The word makes most people uncomfortable — they associate it with confrontation, with asking for too much, with risking the offer they already have.
Research consistently shows that most employers expect candidates to negotiate a job offer. A study by Fidelity Investments found that 87% of people who negotiated their salary received some or all of what they asked for, yet the majority of workers never negotiate at all.
The average difference between accepting an initial offer and negotiating even modestly upward can be £2,000 to £5,000 per year. Over a career, assuming salary increases are calculated as a percentage of the base, a higher starting salary compounds. Someone who negotiates an extra £3,000 in their first professional role — all else being equal — will earn meaningfully more over their career than someone who did not.
Negotiation is a skill, not a personality trait. It can be learned. The most important principles: know your market rate before any conversation; name a specific number rather than a range (ranges anchor to the lower end); never accept or reject an offer immediately — "let me think about it" is always a valid response; and understand that in most hiring scenarios, the offer being on the table means the employer wants you. That is leverage.
A significant proportion of the adult population has a limited understanding of how a business generates, manages, and distributes money — even people who work inside businesses. School teaches the theory of supply and demand but rarely explains what a profit and loss statement is, what a limited company means, or how VAT works.
A limited company is a separate legal entity from the person who owns it. It can own assets, take on debt, and enter contracts in its own name. The owner's personal assets are protected if the company fails — this is called limited liability, and it is the reason limited companies exist. When Richard Branson started Virgin Records in a church crypt in 1972, he set it up as a company. When it failed, he would have lost the company — not his house.
Revenue is the total money coming in. Gross profit is revenue minus the direct costs of producing whatever is being sold. Net profit is what remains after all costs — staff, premises, marketing, administration — have been deducted. A business can have high revenue and lose money if its costs exceed its income. Many people confuse turnover with profit. They are entirely different things.
Understanding these concepts matters whether you intend to start a business or not. Every employee is, in some sense, working inside a profit-and-loss equation. Understanding where your role sits in that equation — and what creates value for the organisation you work for — is the clearest path to being valued, promoted, and paid more.
This is the question that deserves an honest answer.
The cynical answer is that a financially literate population is harder to profit from. People who understand compound interest on credit cards are less likely to carry balances. People who understand mortgage terms are less likely to accept the first offer. People who understand their tax code are more likely to claim what they are owed. There are industries — consumer lending, financial services, insurance — whose business models depend, in part, on information asymmetry.
The more charitable answer is structural inertia. The school curriculum is designed by committees, revised slowly, and has to cover many subjects with limited time. Personal finance was simply not prioritised in the post-war education system that shaped the current curriculum, and changing it is genuinely slow and difficult.
The practical answer is the most important one: it does not matter why it was left out. What matters is that you now know what was missing, and you can choose to fill the gap.
Check your tax code today. It is on your payslip, usually a number followed by a letter — 1257L is the most common. If it is different, log into your HMRC personal tax account at gov.uk to find out why. Millions of people are on the wrong tax code each year and overpay as a result.
Check your credit report for free. All three agencies — Experian, Equifax, and TransUnion — are required by law to provide a statutory report free of charge. Errors on credit files are more common than most people realise. A fraudulent account, a wrong address, or a missed payment that was actually settled can each harm your score without your knowledge.
Open a Stocks and Shares ISA if you do not have one. Any returns — dividends and capital gains — are completely free of UK tax, regardless of the amount. The annual allowance is £20,000. A low-cost global index fund (look for funds tracking the FTSE All-World or MSCI World index) is one of the simplest ways to start investing. Charges matter: look for annual fund fees below 0.25% where possible.
Your workplace pension is one of the most valuable benefits you receive — and most people ignore it. Under auto-enrolment rules, your employer must contribute at least 3% of your qualifying earnings into your pension if you contribute at least 5%. That employer contribution is free money. Increasing your personal contribution often increases the employer match. Check your pension's investment options — the default fund may not be the most appropriate for your age and goals.
The Real Takeaway
There is nothing on this list that is beyond the understanding of a fifteen-year-old. That is precisely the point. The ideas in this issue — tax codes, compound interest, credit scores, ISAs, negotiation — are not complicated. They are just not taught.
The gap between those who build financial security and those who struggle to is not primarily a gap in intelligence. It is a gap in information — in knowing that these things exist, how they work, and how to use them.
NOXEN exists to close that gap. Pass this issue on to someone who needs it.
See you next week,
— The NOXEN Team
Test Yourself
Two levels of ten. Elementary checks you read it. Advanced checks you understood it.