A little nutty. Entirely fictional. No real banking here ↗

Savings · Products · FROM THE ACORNBANK FOREST

Hazelnut Cash ISA — Worked Woodland Examples

An easy-access pot inside a fictional cash ISA wrapper. The model applies no tax to interest, caps new money at a demo £20,000 a year and lets withdrawn money go back in during the same tax year.

An acorn-shaped savings pot with coins.
A fictional bank, a real sense of humour. All people, places, products and figures are invented. No real banking or financial advice. About this demo.

Demo rate card3.60% AER / tax-free (variable)

The pound values and percentages on this page are invented AcornBank product terms, chosen for a realistic bank-style example. They are not current market offers, an invitation to deposit or invest money or a forecast of what a real bank will pay.

Product detailDemo terms
Account typeEasy-access cash ISA
Rate, reward or charge3.60% AER / tax-free (variable)
Minimum / demo annual allowance£1.00 to £20,000.00 per demo tax year
AccessUnlimited withdrawals in the demo; flexible, so money withdrawn can be replaced within the same demo tax year
Eligibility in the scenarioOne adult story customer with unused demo ISA allowance this tax year
FeesNo model account fee
CurrencyGBP (£), used solely for fictional calculations

Try your own numbers

Change the amounts to see what Hazelnut Cash ISA would do in the story. Fictional figures, no application, no advice.

Balance after 5 years£5,967.17£967.17 compounded interest at 3.60% gross, tax-free in the model
Interest in the first year
£180.00Credited yearly and re-invested
Extra earned by compounding
£67.17£900.00 is what paying the interest out would earn over the same term.
That is per month, roughly
£15.00First-year interest spread over twelve months.
Year by year, interest re-invested
YearInterest that yearBalanceTotal interest
1£180.00£5,180.00£180.00
2£186.48£5,366.48£366.48
3£193.19£5,559.67£559.67
4£200.15£5,759.82£759.82
5£207.35£5,967.17£967.17

Hazelnut Cash ISA in charts

The same fictional model as the tables below, drawn rather than written. Hover or focus a mark for its value, or open the table view.

Interest after 12 months by deposit3.60% AER, single deposit, no withdrawals
£0£100£200£300£400£1,000 · Interest: £36.00£36.00£1,000£5,000 · Interest: £180.00£180.00£5,000£10,000 · Interest: £360.00£360.00£10,000

Interest credited annually and rounded to the penny; figures exclude tax unless the wrapper is tax-free.

View as a table
CategoryInterest
£1,000£36.00
£5,000£180.00
£10,000£360.00
How £5,000 could grow over five yearsVariable rate held constant to show compounding
£0£2,000£4,000£6,000StartYear 1Year 2Year 3Year 4Year 5Start · Balance: £5,000Year 1 · Balance: £5,180Year 2 · Balance: £5,366Year 3 · Balance: £5,560Year 4 · Balance: £5,760Year 5 · Balance: £5,967£5,967

A scenario, not a forecast: a rate change would move every later point.

View as a table
PointBalance
Start£5,000
Year 1£5,180
Year 2£5,366
Year 3£5,560
Year 4£5,760
Year 5£5,967

What could your balance look like after 12 months?

Opening depositDemo AERInterest earnedClosing balance
£1,000.003.60%£36.00£1,036.00
£5,000.003.60%£180.00£5,180.00
£10,000.003.60%£360.00£10,360.00

Assumptions: one opening deposit, no additions or withdrawals, no fees or tax, and the stated rate for the whole period. Interest is credited once at each anniversary and rounded to the nearest penny, with half-pennies rounded up. AER and gross p.a. match in this annual-credit model. The ISA wrapper means the model deducts no tax from the interest.

If £5,000.00 stayed for longer

AnniversaryInterest that yearBalanceTotal interest
1£180.00£5,180.00£180.00
2£186.48£5,366.48£366.48
3£193.19£5,559.67£559.67
4£200.15£5,759.82£759.82
5£207.35£5,967.17£967.17

The variable rate is held constant solely to show annual compounding. These are scenarios, not forecasts; a future rate change would change every later row. Figures are before inflation.

Using the demo ISA allowance

New money in the demo tax yearAllowance usedAllowance remaining
£10,000.00 lump sum£10,000.00£10,000.00
£200.00 a month for 12 months£2,400.00£17,600.00
£10,000.00 lump sum plus £200.00 a month£12,400.00£7,600.00

The demo allowance resets each fictional tax year and is shared across every ISA a story customer holds. Money withdrawn from this flexible ISA can be replaced in the same tax year without using more allowance.

Hazelnut Cash ISA is easy-access cash isa in the Savings range, used for tax-free easy-access savings inside a demo ISA wrapper. Its live rate card, summary and worked tables sit above this text and update whenever the product record changes.

Follow the numbers, not just the headline

The tables show the opening amount, time period and result for this product type. Savings figures are before tax unless the wrapper is tax-free; investment figures are scenarios, not forecasts; borrowing figures separate payments, interest and outstanding balance. A displayed result is conditional on its assumptions, not a guarantee. Keep unrelated examples separate rather than adding their balances together.

See the whole Savings range or compare every product on the rates page.

What the example does not promise

All figures are invented and shown to make the demo useful to read and crawl. No money is held, no application is available, and no deposit-protection, regulatory or tax-wrapper status is claimed. Calculations do not account for personal tax, inflation or unstated changes in rates. The fictional bank manager can guarantee only that the next paragraph contains no real acorns.

Related reading


AcornBank: entirely fictional banking, exceptionally committed squirrels.