Money
What If I Put Every Spare £10 Away?
What if I put every spare £10 away?
A spare ten is more of an event than a pound coin and less of a system than a standing order. It shows up when a week ends under budget, when a friend pays you back, when a note in a pocket survives the weekend. This experiment asks how often that happens — default four times a month — and lets it run for 15 years with a 3% illustration you can turn off. Four tens is £40 a month and £480 a year; over 15 years the contributions alone pass £7,000. It will not feel like a plan, which is sometimes why it works. It is still a number, and numbers this size are allowed to live in an account rather than in a kitchen drawer.
Change this
Results update as you move the controls.
Optional. Not guaranteed. Use 0% for an envelope.
Your result
£9,079
illustrated total
£40 a month
- Contributions
- £7,200
- Illustrated growth
- £1,879
- Per year put in
- £480
- Notes in the period
- 720
Not guaranteed
What does that mean?
4 spare £10 notes a month for 15 years, illustrated at 3% a year, is about £9,079. Of that, £7,200 is money you put in and £1,879 is illustrated growth. Interest is not guaranteed; fees, tax and inflation are outside the model.
Timeline
1 year
£487
£480 put in, £7 illustrated growth.
5 years
£2,586
£2,400 put in, £186 illustrated growth.
10 years
£5,590
£4,800 put in, £790 illustrated growth.
15 years
£9,079
£7,200 put in, £1,879 illustrated growth.
Compare
| 2 a month | £4,539 |
|---|---|
| 4 a month | £9,079 |
| 8 a month | £18,158 |
Compare scenarios
Frequency is the honest slider
Four times a month is a calm week-ending habit. Twenty times is close to banking a ten most days and belongs next to the £10-a-day experiment. Once a month is a birthday-shaped windfall. Move the slider to the life you actually have, not the life a poster is selling.
Notes in a drawer versus an account
The 3% default assumes the tens are deposited and then treated as a monthly total. A literal envelope earns nothing and is harder to keep. MoneyHelper’s emergency-savings guidance still points at an instant-access account for money you might need, not a biscuit tin.
Lumpy beats nothing
Related experiments on coins, daily tens and a flat £100 a month are the tidier cousins. If your surplus arrives as occasional notes, this is the less embarrassing model. The earlier-start page is here if you want to see what a longer stack of the same tens would have done, without being told off about it.
How we calculated this
Monthly amount = timesPerMonth × 10, then the standard monthly annuity at annualRate ÷ 12. This experiment provides estimates for educational purposes and is not financial advice. Actual results vary depending on rates, fees, taxes, inflation and individual circumstances. The default 3% is an illustration and not guaranteed. An envelope of notes should be read at 0%.
Go further
A curated rabbit hole from this question. Each link is a real experiment, not a random suggestion.
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