Compound Interest Over 5 Years: Short-Term Calculator
Five years is a common planning horizon for house deposits, car savings, career break funds, and other medium-term goals. At £300/month with 5% returns (a reasonable assumption for balanced or lower-risk investments), you'd accumulate approximately £20,400, with £18,000 contributed and £2,400 in interest. Over shorter periods, conservative rate assumptions are usually wiser, since you have less time to recover from a market downturn. Cash ISAs, premium bonds, or a 60/40 stock-bond portfolio are common choices for 5-year horizons.
Illustrative estimate only, not a guarantee
~£21,685 after 5 years
£19,000 contributed + £2,685 interest
Based on a hypothetical constant return. Actual returns will vary.
By the CompoundWise Team · Updated April 2026
UK-based financial education · Not financial advice
Invest £300/month for 5 years at 5%
£2,685
earned in interest alone
Total value
£21,685
You put in
£19,000
To reach £21,685, most UK investors use a Stocks & Shares ISA
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Compared to investing at 5% vs a 4% cash savings account
Growth Over Time
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Your Personalised Insights
- Your money earns ~£1/day in interest. That's £2,685 earned while you sleep.
- Saving just £50 more per month would add £3,400 to your final balance. That's £3,000 invested for £3,400 extra.
- 5 more years would add £26,547, nearly 122% more, showing how powerful time is.
- Consistency beats timing, investing £300/month for 5 years matters more than picking the perfect moment to start.
- At your current plan, you reach £10k in 3 years. That's a real milestone, and it compounds from there.
- Your £300/month (£3,600/year) fits within the £20,000 ISA allowance, all growth could be tax-free.Invest it tax-free →
- 12% of your final balance is pure compound interest, money your money made.
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Year-by-Year Breakdown: £1,000 Lump Sum Plus £300 Monthly Over 5 Years at 5%
With a £1,000 starting balance and £300 per month at 5% returns, your first year ends at approximately £4,730: £4,600 contributed and £130 in interest. Year two brings roughly £8,570, with cumulative interest reaching approximately £370. By year three, your balance hits about £12,530 and interest earned in that single year exceeds £510. Year four delivers approximately £16,620, and by the end of year five, you reach roughly £20,400. Your total contributions are £19,000 (£1,000 lump sum plus £18,000 in monthly payments), with approximately £1,400 earned through compound interest. While £1,400 may seem modest, it represents money earned with zero effort: and in a tax-free ISA wrapper, every penny is yours.
Best Investment Approaches for a 5-Year Time Horizon in the UK
Five years is too short for an aggressive equity strategy: a single bad year could leave you below your target when you need the money. Conservative and balanced approaches are more appropriate. Option one: cash ISA at 4% to 5%, fully predictable, FSCS protected, with zero risk of capital loss. Option two: premium bonds, which offer tax-free prizes at an effective rate around 4% to 4.5%, with the chance of larger wins. Option three: a balanced multi-asset fund (40% to 60% equities, remainder in bonds and cash) inside a stocks and shares ISA, offering higher expected return than cash but with some volatility risk. Option four: short-dated UK gilt funds, which carry very low risk with returns roughly tracking the Bank of England base rate. For money you absolutely need in five years (like a house deposit), lean toward options one or two.
How to Set Up a 5-Year Savings Plan With Compound Interest
Define your specific goal: house deposit, car fund, career break, or wedding savings. Calculate the target amount and use the calculator above to confirm £300 per month at your chosen return rate gets you there. Open the appropriate account: a cash ISA for maximum safety, or a stocks and shares ISA for potentially higher returns with some volatility risk. Set up your £300 monthly direct debit on payday. If you have the £1,000 lump sum available, invest it immediately to give compound interest the largest base from day one. Review your progress every six months rather than monthly: over five years, you want steady progress, not daily anxiety. As you approach the final 12 months, consider moving into cash or a money market fund to lock in your gains and eliminate the risk of a last-minute market dip.
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Common questions
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