Compound Interest in Reverse
You've heard that compound interest is the "eighth wonder of the world." What's less celebrated is its dark twin: compound interest working against you. When you're in debt, every day you don't pay it off, interest compounds on interest.
The Wealth Destroyer
A credit card at 22% APR doubles what you owe in just 3.3 years if you make no payments. A payday loan at 1,000% APR? Your debt multiplies 11× in one year.
Visualizing the Drain
Imagine filling a bathtub (your wealth) while the drain is open (interest on debt). The higher your interest rate, the wider the drain. You can pour in money all month, but if the drain is big enough, the water level never rises.
The Daily Bleed
Interest accrues daily, even when you're sleeping:
Daily Interest on £5,000 Debt
That overdraft costs £38/week, £164/month, or £1,970/year in interest alone.
The Minimum Payment Trap
£3,000 Credit Card at 22% APR
Minimum Payments (2%)
27 years
to pay off
£4,400
interest paid
£7,400
total repaid
Fixed £150/month
2 years
to pay off
£650
interest paid
£3,650
total repaid
Same debt, same rate — £3,750 difference based on payment strategy
The Investment Comparison
Paying off debt is a guaranteed investment return. Consider this:
- Stock market average return: ~7–10% (not guaranteed, can lose)
- Savings account: ~4–5% (guaranteed)
- Paying off 22% credit card debt: 22% guaranteed return
Every £100 you put toward a 22% debt saves you £22/year in interest — guaranteed. No investment can match that risk-free return.
Interest Rate Impact Over Time
£10,000 Debt Over 10 Years (Minimum Payments)
| APR | Interest Paid | Total Repaid |
|---|---|---|
| 7% | £4,200 | £14,200 |
| 15% | £10,500 | £20,500 |
| 22% | £18,800 | £28,800 |
| 30% | £28,000 | £38,000 |
Breaking Free: Strategies
1. Attack the Rate
- Balance transfer to 0% card
- Consolidate to lower-rate personal loan
- Negotiate with current lender
2. Attack the Balance
- Pay more than minimum — any extra helps
- Use windfalls for debt (tax refunds, bonuses)
- Redirect savings temporarily to debt (if rate is higher)
3. Attack the Timeline
- Set a debt-free date and work backwards
- Use bi-weekly payments (26 half-payments = 13 full payments)
- Round up payments for psychological wins
Action Steps
- Calculate the daily interest cost of each debt
- Look at your total debt and imagine the daily "drain"
- Compare your highest debt rate to investment returns
- Commit to paying more than the minimum on your highest-rate debt
- Explore 0% balance transfers or consolidation options
"Think of debt interest as a subscription you're paying for nothing. Every pound of interest is a pound that could have been yours."
Unlike Netflix — you get zero value from interest payments
Put It Into Practice
Use our Compound Interest Calculator to visualize how interest accumulates on debt, and see the dramatic difference higher payments make.
Try Compound Interest Calculator