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KS5 · Year 12 / Year 13 · Lesson plan

Compound investing from age 18

A classroom-ready 50-minute KS5 lesson on long-horizon investing for a young adult: ISA vs SIPP wrapper, the 47-year compound case study, drip-feed vs lump-sum, and the role of diversification.

Key Stage
KS5
Year group
Year 12 / Year 13
Age range
16–18
Duration
50 minutes
Subject
PSHE / Economics / Citizenship
Cost
Free

Learning aim

Students can compare ISA and SIPP for an 18-year-old investor, explain compound growth over a 47-year horizon, and articulate the case for diversified global equity over picking individual stocks.

CURRICULUM National Curriculum links

RESOURCES What you'll need

LESSON Lesson structure (50 minutes)

Opening
HOOK
Show two columns on the board. Column A: "Save £100/month starting at age 18, earn 0% real return, retire at 65." Column B: "Invest £100/month starting at age 18, earn 5% real return, retire at 65." Ask: how different are these? Take guesses. Reveal: A = £56,400. B = £253,000. The cost of NOT investing: ~£200,000.
Direct teach
TEACH
Define a stocks-and-shares ISA: £20,000/year subscription limit, all growth tax-free for life, withdrawable anytime. Define a SIPP: £60,000/year annual allowance, tax relief on contributions (basic rate +25%), but locked until age 55-58. For an 18-year-old, ISA usually wins on flexibility for early career — they may need the money for a house deposit. SIPP wins on long-term tax efficiency. Most 18-year-olds should focus on ISA first.
Pupils apply
GUIDED
Calculate: £100/month into a stocks-and-shares ISA at 6% real return for 47 years. Use the compound formula or table. Result: approximately £294,000. Now £200/month: ~£588,000. Now £50/month: ~£147,000. Discuss: what's the relationship between contribution and result? (Roughly linear with contribution, exponential with TIME.)
Stretch / depth
CHALLENGE
Discuss: how do you invest? Three options: (1) pick individual stocks (e.g., buy Apple shares). (2) actively managed fund (a fund manager picks for you). (3) index fund / global ETF (own a small slice of every major company worldwide). Evidence: most active funds underperform index funds over the long term, net of fees. For an 18-year-old: VWRP (Vanguard FTSE All-World) at 0.22% TER captures the entire global market for almost no fee.
Close
PLENARY
Pupils write three things they've learned and one decision they might make at 18. Share three. Land on: start early, use ISA wrapper, pick low-cost diversified funds, ignore the noise about "hot stocks."

DIFFERENTIATION Adapting for all learners

Support (working below ARE)

Calculate only the linear "no growth" case first to build intuition. Then introduce growth as "you also earn money on the money you earn." Avoid compound formula until basics are stable.

Stretch (working above ARE)

Pupils research the difference between accumulating (Acc) and distributing (Dist) fund variants. Calculate the impact of 0.10% vs 0.50% TER on a 47-year portfolio.

SEND SEND adaptations

For pupils with dyscalculia: use a visual "compound stack" — show the growth as physical stacks each year. For autism: provide a clear flowchart "do I need the money in 5 years? → use ISA. Need it in 30 years? → SIPP."

EAL EAL support

Vocabulary: "compound", "ISA wrapper", "SIPP", "Total Expense Ratio (TER)", "diversification", "global ETF". Sentence frames: "The earlier I start, the more I have at 65 because ___."

ASSESSMENT Assessment criteria

Pupils can: (1) calculate the 47-year value of regular contributions at a given growth rate; (2) compare ISA and SIPP correctly for an 18-year-old; (3) explain why a low-cost diversified ETF is usually preferred to picking individual stocks; (4) articulate the trade-off between flexibility (ISA) and tax efficiency (SIPP).

HOME Homework pack

Three tasks consolidating compound investing concepts. ~40 minutes.

Compound table

What pupils do: Build a spreadsheet showing the final pot value at age 65 for these monthly contributions starting at 18: £50, £100, £200, £400. Use 6% real return.

Expected output: Spreadsheet or table with 4 results.

Marking guidance: 8 marks — 2 per accurate result.

Wrapper choice

What pupils do: In 200 words, explain why an 18-year-old's first investing pound should usually go into an ISA rather than a SIPP.

Expected output: 200-word explanation.

Marking guidance: 6 marks — 2 for ISA mechanics, 2 for SIPP mechanics, 2 for justified preference.

Active vs index

What pupils do: Research and summarise the SPIVA report (Standard & Poor's Indices Versus Active). What does it tell us about active fund vs index fund performance over 20-year periods?

Expected output: Short structured response.

Marking guidance: 6 marks — 3 for accurate research, 3 for analytical conclusion.

HOME Homework pack

Four activities to consolidate UK income tax mechanics. ~30 minutes.

Band calculation

What pupils do: For each gross salary, calculate the UK income tax (England/Wales/NI 2026/27 rates): (a) £15,000, (b) £30,000, (c) £55,000, (d) £85,000. Show the band split for each.

Expected output: 4 calculations with band-by-band working.

Marking guidance: 2 marks per accurate total (8 marks). Bonus 4 marks for correct band splits.

Personal Allowance research

What pupils do: What is the Personal Allowance? Why does it exist? Who loses it (the taper rule)?

Expected output: A 3-question short-answer response.

Marking guidance: 2 marks per accurate answer. 6 marks total.

Public spending

What pupils do: Find 5 different things UK income tax pays for. Order them by approximate share of government spending (biggest first).

Expected output: A ranked list of 5 spending categories.

Marking guidance: 1 mark per category, 1 mark per correct relative ranking. 8 marks total (e.g. NHS, pensions, education, defence, welfare).

Extension (optional)

What pupils do: Compare England, Scotland, and Wales income tax for someone earning £50,000. Which nation pays the most? Why?

Expected output: A 3-nation comparison table plus 2-sentence explanation.

Marking guidance: Up to 6 marks for accurate research and conclusion (Scotland pays more above ~£28k).

Family discussion prompt (safeguarding-aware)

Ask a working adult: "Name three things you think our tax money pays for." Compare their answers to what you learned in class.

SAFEGUARDING Classroom safeguarding

Note for teachers: Do not ask pupils about their own family's tax band, salary, or income. Frame all examples through fictional salaries. Be aware some pupils may be unsure of family financial circumstances — focus on the public-spending side of the lesson, not personal income.

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