All calculators
Tax year 2026/27
NotesCompound Engine
Project exponential capital growth with recurring contributions, compounding frequency, and real inflation drag.
£25,000
8.0%
2.5%
20 years
£500
0.0%
Future value
£417,680
Real purchasing power
£254,898
Interest earned
£272,680
Total invested
£145,000
Effective annual rate
8.30%
Lump-sum doubling
8 yrs, 8 mos
Nominal growth
Snapshot the current run, then change inputs to compare.
PrincipalDepositsInterest
Schedule
| Year | Interest | Balance | Real |
|---|---|---|---|
| 1 | £2,300 | £33,300 | £32,488 |
| 2 | £2,989 | £42,289 | £40,251 |
| 3 | £3,735 | £52,024 | £48,309 |
| 4 | £4,543 | £62,567 | £56,682 |
| 5 | £5,418 | £73,985 | £65,392 |