0% interest installments: what ‘easy monthly payments’ really cost

Splitting a price into small monthly amounts makes expensive things feel affordable. Research on payment methods explains why — and what to check before you sign up.

Dopamine Shop editorial team · Last updated: 25 September 2026 · 6 min · বাংলা

“Only ৳2,499 a month.” For a phone that costs ৳29,988, that line does something clever. It replaces one large, uncomfortable number with a small, friendly one. It does not change the price, but it changes how the price feels. Zero-percent installment plans — often called EMI, for equated monthly instalments — have become a normal part of buying electronics, furniture and appliances. Used carefully, they can spread a planned cost. Used on impulse, they can quietly fill a year of future months with payments.

This article looks at why installments feel so easy, what can hide behind “0%”, and a few questions worth asking first.

Paying later hurts less

In 1998 Drazen Prelec and George Loewenstein published a paper in Marketing Science called “The red and the black”. Their central idea is that paying for something causes a kind of immediate discomfort — they called it the “pain of paying” — and that this pain is strongest when payment and consumption are close together. When you pay in cash at the moment you receive something, the two are tightly “coupled”. When you pay later, or in small pieces spread over time, the link loosens and the purchase feels lighter.

Other studies support this. Drazen Prelec and Duncan Simester ran an experiment in which people bid for tickets to sought-after sports events; those told they would pay by credit card offered substantially more than those told they would pay in cash (Marketing Letters, 2001). Dilip Soman found that people paying by card or cheque tended to remember their past spending less accurately than people paying cash, and that their spending decisions were less affected by what they had already spent (Journal of Consumer Research, 2001).

Installments take this further. Not only is payment delayed, it is sliced into amounts small enough to fit comfortably next to a phone bill. Each slice feels minor. The total rarely gets looked at again.

Your future self feels like a stranger

There is another reason future payments feel easier to accept: we tend to think about our future selves a bit like other people. Hal Hershfield and colleagues found that people who were shown age-progressed images of themselves were more willing to set money aside for the future (Journal of Marketing Research, 2011). The broader point from this line of research is that the person who will pay the installment next March does not feel entirely like you.

So when a plan asks for twelve payments, the first one feels real and the last eleven feel like someone else's problem. By month eight, you are that someone else.

What can hide behind “0%”

A plan can truly charge no interest and still cost more than paying upfront. Things to check in the terms:

• Processing or service fees. Some plans add a one-time fee for converting a purchase to installments. On a ৳30,000 item, even a small percentage is real money.
• Lost cash discount. Some sellers offer a lower price for full payment. If the installment price is the higher “list” price, the difference is effectively interest.
• Late-payment penalties. Missing one installment can trigger fees, and on some plans the interest-free status may end.
• Card limits. An installment plan on a credit card may reduce your available limit for the whole period, not just by the monthly amount.
• Several plans at once. The biggest risk is not one plan but five. Each looks small; together they can take a large share of a monthly income.

We cannot tell you the terms of any particular bank or seller — they vary and change. The only reliable way is to read the actual agreement and, if something is unclear, ask in writing.

Big limits can feel like permission

Dilip Soman and Amar Cheema studied how people interpret credit limits (Marketing Science, 2002). They found that people sometimes read a high credit limit as a signal about their own future earning power — “the bank thinks I can afford this” — and spent more as a result. A pre-approved installment offer can work the same way. It is not a judgement that the purchase is wise; it is a judgement that the lender expects to be paid.

Five questions before you split a payment

1. Would I buy this today if I had to pay the full price in cash? If not, the installment is doing the persuading.
2. What is the total I will pay, including all fees? Write it down next to the cash price.
3. What other installments am I already paying? Add them up. Look at the monthly total, not the new one alone.
4. What happens if my income drops for two months? If the answer is frightening, the plan is too big.
5. Will I still be using this item when the last payment is due? Paying for a phone you have already replaced is the classic regret.

If the answers are good, an installment plan can be a sensible way to spread a cost you had already planned. If they are not, put the item on a 48-hour waiting list and look again.

Practising the feeling without the debt

One reason this site exists is to let people enjoy the “I'm buying this!” moment without anything real happening. You can add the most expensive gadget in our Dopamine tech store to your cart and check out for ৳0.00. There are no installments, because there is no money. If you want a more practical exercise, list every installment you currently pay, add them up, and compare that monthly total with what you spend on food. For many households, that comparison is eye-opening.

For more on why small, spread-out costs are easy to overlook, see our article on tracking spending without a spreadsheet.

FAQ

Is a 0% installment plan always a bad idea?

No. For a planned purchase you can comfortably afford, with no hidden fees, it can be a reasonable way to spread payments. The risk comes from using it to buy things you would not otherwise buy.

How do I find the real cost of a plan?

Add every payment plus every fee, and compare it with the lowest price you could pay upfront. The difference is the cost of the plan.

What should I do if I already have too many installments?

Stop adding new ones, list the existing ones with end dates, and consider talking to your bank or a qualified financial adviser about your options.

Does this site offer installments?

No. Nothing here is for sale, no payment information is ever collected, and every order costs ৳0.00.

Sources

• Prelec, D., & Loewenstein, G. (1998). The red and the black: Mental accounting of savings and debt. Marketing Science, 17(1), 4–28.
• Prelec, D., & Simester, D. (2001). Always leave home without it: A further investigation of the credit-card effect on willingness to pay. Marketing Letters, 12(1), 5–12.
• Soman, D. (2001). Effects of payment mechanism on spending behavior: The role of rehearsal and immediacy of payments. Journal of Consumer Research, 27(4), 460–474.
• Soman, D., & Cheema, A. (2002). The effect of credit on spending decisions: The role of the credit limit and credibility. Marketing Science, 21(1), 32–53.
• Hershfield, H. E., Goldstein, D. G., Sharpe, W. F., Fox, J., Yeykelis, L., Carstensen, L. L., & Bailenson, J. N. (2011). Increasing saving behavior through age-progressed renderings of the future self. Journal of Marketing Research, 48(SPL), S23–S37.

This article is general information and entertainment; it is not medical, psychological or financial advice.