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Mortgages · Products · FROM THE ACORNBANK FOREST

Treehouse Mortgage — Worked Woodland Examples

A made-up mortgage with a two-year introductory fixed rate. The repayment table includes the assumed rate change after month 24, so the attractive opening payment is not mistaken for a 25-year guarantee.

A treehouse in a leafy oak.
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 card4.59% fixed for 2 years; then 6.49% assumed variable rate

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 typeRepayment mortgage
Rate, reward or charge4.59% fixed for 2 years; then 6.49% assumed variable rate
Illustrative advance£25,000.00 to £500,000.00
AccessMonthly capital-and-interest repayments over 25 years in the illustration
Eligibility in the scenarioAn adult story applicant with a deposit of at least 20% and assumed affordability
Fees£999.00 arrangement fee, paid upfront
CurrencyGBP (£), used solely for fictional calculations

Try your own numbers

Change the amounts to see what Treehouse Mortgage would do in the story. Fictional figures, no application, no advice.

Monthly payment for the first 24 months£1,121.91£200,000.00 advance at 4.59%
Then at the 6.49% reversion rate
£1,334.37
Total interest over the term
£195,213.58Plus the £999.00 arrangement fee
Deposit needed
£50,000.0020% of the price; 80% loan to value

Treehouse Mortgage 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.

Balance over the 25-year term£200,000 advance; payments recalculated at month 25
£0£50,000£100,000£150,000£200,000StartY4Y8Y12Y16Y20Y24Y25Start · Balance owed: £200,000Y1 · Balance owed: £195,626Y2 · Balance owed: £191,047Y3 · Balance owed: £187,324Y4 · Balance owed: £183,352Y5 · Balance owed: £179,114Y6 · Balance owed: £174,593Y7 · Balance owed: £169,770Y8 · Balance owed: £164,625Y9 · Balance owed: £159,135Y10 · Balance owed: £153,278Y11 · Balance owed: £147,030Y12 · Balance owed: £140,364Y13 · Balance owed: £133,252Y14 · Balance owed: £125,664Y15 · Balance owed: £117,569Y16 · Balance owed: £108,933Y17 · Balance owed: £99,720Y18 · Balance owed: £89,890Y19 · Balance owed: £79,403Y20 · Balance owed: £68,215Y21 · Balance owed: £56,279Y22 · Balance owed: £43,545Y23 · Balance owed: £29,959Y24 · Balance owed: £15,465Y25 · Balance owed: £0.00£0.00

The reversion rate is held constant; a real variable rate would move.

View as a table
PointBalance owed
Start£200,000
Y1£195,626
Y2£191,047
Y3£187,324
Y4£183,352
Y5£179,114
Y6£174,593
Y7£169,770
Y8£164,625
Y9£159,135
Y10£153,278
Y11£147,030
Y12£140,364
Y13£133,252
Y14£125,664
Y15£117,569
Y16£108,933
Y17£99,720
Y18£89,890
Y19£79,403
Y20£68,215
Y21£56,279
Y22£43,545
Y23£29,959
Y24£15,465
Y25£0.00
Where each year’s payments goInterest versus capital in selected years
  • Interest
  • Capital repaid
£0£5,000£10,000£15,000£20,000Year 1 · Interest: £9,089Year 1 · Capital repaid: £4,374Year 1Year 2 · Interest: £8,884Year 2 · Capital repaid: £4,579Year 2Year 3 · Interest: £12,289Year 3 · Capital repaid: £3,723Year 3Year 5 · Interest: £11,775Year 5 · Capital repaid: £4,237Year 5Year 10 · Interest: £10,156Year 10 · Capital repaid: £5,857Year 10Year 15 · Interest: £7,918Year 15 · Capital repaid: £8,095Year 15Year 20 · Interest: £4,824Year 20 · Capital repaid: £11,188Year 20Year 25 · Interest: £549.09Year 25 · Capital repaid: £15,465Year 25

Early years are at the introductory fixed rate; later years at the assumed reversion rate.

View as a table
CategoryInterestCapital repaid
Year 1£9,089£4,374
Year 2£8,884£4,579
Year 3£12,289£3,723
Year 5£11,775£4,237
Year 10£10,156£5,857
Year 15£7,918£8,095
Year 20£4,824£11,188
Year 25£549.09£15,465

A £200,000 repayment-mortgage illustration

ItemModel amount
Treehouse price£250,000.00
Deposit (20%)£50,000.00
Advance (80% LTV)£200,000.00
Term25 years / 300 monthly payments
Months 1–24 payment£1,121.91
Months 25–299 payment£1,334.37
Adjusted final payment£1,335.99
Upfront arrangement fee£999.00
Total interest£195,213.58
Total repayments plus arrangement fee£396,212.58
Illustrative model APRC6.35%

Selected years of the repayment schedule

YearPayments in that yearInterestCapital repaidBalance at year end
1£13,462.92£9,088.72£4,374.20£195,625.80
2£13,462.92£8,883.68£4,579.24£191,046.56
3£16,012.44£12,289.49£3,722.95£187,323.61
5£16,012.44£11,774.95£4,237.49£179,114.21
10£16,012.44£10,155.68£5,856.76£153,278.16
15£16,012.44£7,917.62£8,094.82£117,569.42
20£16,012.44£4,824.38£11,188.06£68,215.36
25£16,014.06£549.09£15,464.97£0.00

Assumptions: 4.59% nominal annual interest for 24 months, then 6.49% for the remaining 276 months. The latter is a variable rate held constant only for illustration. Interest is calculated monthly on the outstanding balance and rounded to pennies. Payments are recalculated at month 25; the final payment clears the balance. No overpayments, missed payments or fees other than the £999.00 upfront fee. No valuation, legal, tax or insurance costs are included. The model APRC is the annualised monthly cash-flow return using the advance less the upfront fee; it is an illustrative calculation, not a regulated quotation.

Treehouse Mortgage is repayment mortgage in the Mortgages range, used for buying a fictional treehouse. 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.

Other mortgage terms in the story

There are no overpayments in the repayment table. The separate early-repayment illustration would charge 2% of capital repaid early during months 1–12, 1% during months 13–24 and zero after that; those charges are excluded from the scheduled-payment total. The £999 fee is paid upfront rather than added to the advance. This is not a loan offer, affordability decision or property valuation.

See the whole Mortgages 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.