Borrowing, and what it costs

A loan is a service with a price, and the price is not the interest rate.

The rate is a unit price. What you pay is the rate multiplied by how much you borrowed, multiplied by how long you keep it — and the third term is the one people ignore, because it is the one the lender is most relaxed about extending.

Why the early years feel like nothing is happening

An EMI is a fixed monthly payment split two ways: interest on what you still owe, and repayment of the balance itself. Because the interest is charged on the outstanding amount, and the outstanding amount is at its largest at the start, the early instalments are mostly interest.

Take ₹50,00,000 over 20 years at 8.5%. The EMI is about ₹43,391. In the very first month, roughly ₹35,400 of that is interest and only about ₹8,000 reduces what you owe. Pay for a full year — ₹5,20,000 — and the balance has fallen by around ₹1,00,000.

That is not a trick and nothing has gone wrong. It is what charging interest on an outstanding balance means. But it explains two things people find baffling: why the loan statement barely moves in the early years, and why selling in year four means you have paid a great deal of interest and built very little equity.

The mirror image is the useful part. Money repaid early removes interest for every remaining year. ₹1,00,000 paid off in year two of that loan is ₹1,00,000 that stops accruing 8.5% for eighteen years. The same ₹1,00,000 paid in year eighteen saves almost nothing — same rupees, very different effect, and the difference is time.

What a credit card actually charges

Cards quote a monthly rate, and the monthly rate is the most misleading number in consumer finance.

A card at 3.5% a month is not 42% a year. It is:

(1 + 0.035)^12 − 1 = 51.1%

because unpaid interest joins the balance and is charged interest itself. Chapter 8 is about compounding working for you; this is the same machinery pointed the other way, and it is the fastest-moving money in most people's lives.

Two consequences follow, and both are worth internalising before any investing decision.

No investment reliably pays what a card charges. If you are carrying a card balance and choosing between clearing it and investing, clearing it is a certain 51% return against an uncertain figure much lower. That is not a close call, and it is the one case where the answer to "should I invest or repay" is not "it depends".

The minimum payment is a trap with a name. Paying the minimum keeps the account in good standing and the balance essentially intact, which is exactly what it is designed to do. It is a product feature, not a courtesy.

Which debt to clear first

You have several debts and one spare amount each month. Two orderings compete.

Highest rate first. Pay minimums on everything, put every spare rupee at the most expensive debt, then move to the next. This is arithmetically optimal — it always costs the least in total interest, by definition.

Smallest balance first. Clear the smallest debt entirely, regardless of rate, then roll its payment into the next. This costs more in interest and works better for some people, because finishing something produces the momentum to keep going.

The honest position: highest rate first is right on the numbers, and the gap is usually smaller than people assume. If you know from experience that you abandon plans without visible progress, the cheaper plan you actually complete beats the optimal one you quit. Run the numbers on both and decide with the gap in front of you rather than on principle.

One thing neither ordering changes: pay every minimum, always. A missed payment costs a late fee, a penal rate, and a mark on your credit record that is expensive for years, and no repayment strategy is worth triggering it.

Good debt, bad debt, and the honest version

The usual framing is that a loan against an appreciating asset is good and one against a depreciating asset is bad. It is a useful first cut, and too crude to decide anything.

Three questions do more work:

What rate, honestly computed? A home loan at 8.5% and a personal loan at 16% are different products in the same way a bicycle and a motorcycle are both vehicles.

Does it buy an asset, an income, or a moment? A loan for a skill that raises your income can be excellent at 12%. A loan for a wedding is expensive at any rate, which is a statement about arithmetic and not about weddings.

What happens if your income stops? This is the question that actually matters and the one that never gets asked. A loan you can service on one income in a two-income household is a different risk from one that needs both. Chapter 4 is the other half of this answer.

The one that is not debt

Borrowing against an emergency fund you do not have is how a small problem becomes an expensive one: the car breaks, the card covers it, the balance compounds at 51%, and the minimum payment keeps it alive for years. That sequence is common and entirely avoidable, and avoiding it is chapter 4's whole purpose.

The point

Rate, amount, time — and time is the one you control after signing. Clear the expensive debt first, never miss a minimum, and treat any monthly rate as an annual one you have not calculated yet.