Per-Day Interest on a Short-Term Loan in India: Why a Small Number Is Not a Small Cost

A per-day interest rate charges you for every day you hold the money. On Rs 20,000 at 0.1 percent a day that is Rs 20 a day, so a 30-day loan costs Rs 600 and you repay Rs 20,600. It looks small because it is quoted in a small unit: the same rate is 36.5 percent a year, and once a processing fee and GST are added, the all-in annualised cost of a small short loan is usually well above that.

What does a per-day interest rate actually mean?

Interest accrues by the day, and the arithmetic is simple: principal, multiplied by the daily rate, multiplied by the number of days. All three inputs matter.

• Principal is normally the sanctioned amount, not the smaller sum that reaches your account after charges are deducted.
• The daily rate is quoted to two or three decimal places, which is where the comfort comes from.
• Days run from disbursal to repayment. Two extra days is two extra days of interest, every time.

So 20,000 x 0.001 = Rs 20 a day. Thirty days is Rs 600; ninety days is Rs 1,800, and you repay Rs 21,800. Nothing clever is happening, the cost simply scales with time — which makes the tenor on the offer screen as important as the rate.

Why does the daily number feel so small?

Unit framing. A cost of Rs 25 a day sits in the same mental bucket as a bus fare; Rs 9,125 a year sits in the bucket marked serious money. They are the same thing, because 25 x 365 = 9,125. Nothing dishonest has to be said for this to work: the quote is accurate, it is simply expressed in the unit that flatters it. The framing also hides the gap between offers — 0.08 percent a day against 0.15 percent a day reads as trivial, but annualised it is 29.2 percent against 54.75 percent a year.

How do you convert a per-day rate into a yearly one?

Multiply by 365. That is the simple annualised rate, and it is the only fair basis for comparing a daily quote with anything else on the table.

• 0.05 percent a day = 18.25 percent a year
• 0.08 percent a day = 29.2 percent a year
• 0.1 percent a day = 36.5 percent a year
• 0.15 percent a day = 54.75 percent a year
• 0.25 percent a day = 91.25 percent a year
• 0.5 percent a day = 182.5 percent a year
• 1 percent a day = 365 percent a year

It works in reverse too. 2 percent a month is 24 percent a year, about 0.066 percent a day; 3 percent a month is 36 percent a year, almost exactly 0.1 percent a day.

What does the day count include?

More days than people expect. The clock normally starts on the disbursal date, not the approval date, and stops when the money is credited back to the lender rather than when you pressed pay. A transfer begun on a Friday evening may settle on Monday, and that weekend is chargeable. At Rs 20 a day, three extra days is Rs 60, a tenth of the whole interest bill on a one-month loan. Get both dates in the written terms.

Is the interest charged on the original amount or on the balance?

Most borrowers never ask, and it changes the total. Interest charged on the original sanctioned amount for the whole tenor is a flat calculation; interest charged on the outstanding balance is reducing balance. On a single-repayment 30-day loan the two are identical, because the balance never falls, but the moment the loan is repaid in instalments they diverge sharply. You can run both in the (Fast Paisa Loan): App SIM app, an independent, unofficial simulation and calculator rather than a lender.

Where does the rest of the cost come from?

Interest is rarely the whole bill. A processing fee is charged as a percentage of the sanctioned amount or as a flat rupee figure, GST applies to it, and the total is often deducted before disbursal.

Take Rs 15,000 for 30 days at 0.1 percent a day. Interest is 15,000 x 0.001 x 30 = Rs 450. Add a 2 percent fee of Rs 300 and GST on it at 18 percent, Rs 54, and Rs 354 comes off the disbursal: you receive Rs 14,646 and your total cost is Rs 804. Against the cash you actually got, that is 5.49 percent in 30 days, roughly 66.8 percent a year — against a headline that annualised to 36.5 percent.

That is what APR is for: one figure annualising interest and charges together. Lenders in India are expected to set out the all-inclusive cost of a retail loan in writing before you accept. The rules and the official complaint channels are published by the Reserve Bank of India on the official RBI website, rbi.org.in.

How do you sanity-check an offer in a minute?

1. Multiply the daily rate by 365.
2. Add every charge to the interest, then divide by the cash you will actually receive.
3. Annualise that by multiplying by 365 and dividing by the number of days.
4. Ask for the all-in APR in writing. A refusal is itself an answer.

Frequently asked questions

Is a per-day rate the same as an APR?

No. A per-day rate covers interest only; an APR annualises interest plus the processing fee and other charges, so it is almost always higher and it is the number that makes offers comparable.

If I repay early, does the interest fall?

Usually yes where interest accrues on days outstanding. But the processing fee is normally not refunded, and some contracts pre-compute interest or add a foreclosure charge. Check the written terms first.

Are daily rates like these allowed in India?

Regulated lenders generally price under a board-approved policy rather than one statutory cap, but they are expected to disclose the full cost up front and to recover fairly. Rules change, so confirm the current position at rbi.org.in.

Can an app tell me what I will be charged?

No. An independent calculator estimates from figures you type in; only the lender can state its own charges. Never enter an Aadhaar number, a PAN, a bank account number, a password or an OTP into any third-party app or website.

A daily rate is not misleading, it is small-unit framing, and the fix is arithmetic rather than suspicion. To run the sums on your own figures, the independent, unofficial app on Google Play works with no account and no login. It is not an official representative of Fast Paise and is not affiliated with, endorsed by, or connected to Fast Paise, and it does not represent the Reserve Bank of India or any other government body. It does not offer loans and cannot be used to apply for a loan; it does not process applications, disburse funds, check application status, or access any account. All figures are estimates for planning only; always confirm the actual terms with Fast Paise directly.