Decisions

Cost of Waiting

What putting off a SIP, a prepayment, a retirement plan or an emergency fund by a few years actually takes off the end

About the Cost of Waiting calculator

What putting off a SIP, a loan prepayment, a retirement plan or an emergency fund by a few years actually takes off the end. Invest ₹20,000 a month today or in five years - the gap is far larger than the instalments you missed, because the ones you missed were the earliest.

How the maths works

The same plan, two start dates

Cost of waiting = what starting now is worth - what starting later is worth

Why it exceeds the missed instalments

The months you skip are the earliest ones, and the earliest ones are the only ones that get the full horizon to compound

Spent, not parked

The default assumes the money went on other things, which is what actually happened. Parking it in a savings account is offered as an option and recovers only a fraction

Delayed prepayment

Costs extra loan interest, set against whatever the money earned while it waited - and the whole grown amount goes into the loan, not the original sum

Delayed emergency fund

Costs nothing at all until an emergency arrives, at which point it costs credit card interest. That is the bet

A worked example

₹20,000 a month, twenty years, delayed by five

Starting now leaves roughly ₹1.7 crore; starting in five years leaves roughly ₹95 lakh. The gap is around ₹75 lakh against ₹12 lakh of instalments never made - six times the money, because those sixty instalments were the ones with twenty years to grow.

How to use it

1. Choose what is being put off
2. Enter the amount, the horizon and the delay
3. Say whether the money was spent or parked
4. Read the gap, and the catch-up instalment where one applies

What it accounts for

• Four versions - a SIP, a loan prepayment, a retirement plan, an emergency fund
• Says what a late starter has to invest each month to catch up, which is usually the number that changes minds
• Runs on the same engine as the decision comparator, so the two agree
• Shows the gap in today's money as well as at the horizon
• The emergency fund version simulates the shock landing during the years you waited

Why it is worth working out

• Turns a vague intention into a priced decision
• Shows that starting small beats starting late, in figures
• Makes the emergency fund case without moralising - it is simply the cost of borrowing at 42%
• Gives a concrete answer to 'I'll start next year'

Questions people ask

Why is the cost so much larger than the instalments I skipped?

Because the ones you skip are the earliest, and the earliest are the only ones that get the full horizon to compound. Delaying ₹20,000 a month by five years on a twenty-year plan skips ₹12 lakh of contributions and costs roughly ₹75 lakh at the end — six times the money. The last five years of a plan barely matter; the first five are most of it.

What if I saved the money instead of spending it?

Switch the assumption and see. Parking it in a savings account at 3.5% recovers a fraction and no more, because the gap was never about the cash — it was about the years. In practice almost nobody who postponed a SIP for five years has the sixty instalments sitting in a drawer, which is why "spent" is the default.

I have already lost the years. What do I do now?

Look at the catch-up figure. It says what the instalment has to become to land in the same place from a later start — typically one and a half to two times the original. That is the real cost of the delay, expressed as something you can act on today rather than as a regret.

Why does delaying an emergency fund cost nothing when nothing goes wrong?

Because that is true, and it is exactly why people wait. Both savers end up holding the same sized reserve, so the entire cost of waiting is the cost of the emergency having arrived first. Put a shock in the middle of the delay and the gap appears immediately, all of it interest on money borrowed at a card rate.

Does waiting to prepay a loan always cost money?

No — and this is the one version where waiting can win. While the money waits it earns something, and the whole grown amount goes into the loan when the time comes. If it earns more than the loan rate, waiting was right. If it sits in a current account earning nothing, waiting cost you every month of interest the prepayment would have removed.

This calculator is for information and education. It is not financial advice — see the disclaimer.