Track where your money goes

You cannot invest a number you have never calculated.

Most people know their salary to the rupee and have no idea what they spend to the rupee. That is not carelessness — it is the default. Nobody is trained to close the gap, and no app will do it for you, because the hard part is not recording transactions. The hard part is admitting the total.

This lesson takes one evening. It produces the one number that every later lesson on this site depends on: your surplus.

The surplus is the only number that matters

Your surplus is what is left after essentials, after EMIs, after the household runs for a month. It is the only money you are allowed to invest.

Not your salary. Not your “savings balance” you have not touched. Not the money you expect to get back. The surplus.

Figure	What it is	Can you invest it?
Gross salary	Before deductions	No — you have not received it
Take-home	In your account	No — it is committed
Monthly surplus	Left after a real month	Yes — this is the entire investable pot
Existing portfolio value	Already invested	Not new money
Expected bonus / refund	Not received	No — count it when it lands

Most beginners try to invest their take-home pay and then discover in month three that there is nothing left. The surplus removes the ambiguity.

The one-evening method

Do not start by installing six apps. Start with the last 60 days of bank statements — your primary account and, if you have one, your credit card.

Step 1 — Separate essentials from lifestyle

Sort every transaction into exactly two buckets. This split is the whole exercise; do not over-engineer it.

Essentials (things that stop if you stop paying)

• Rent or EMI
• Electricity, water, gas, internet
• Groceries
• School fees, tuition
• Medicines, doctor, insurance premiums
• Fuel or transport to work
• Loan EMIs other than the housing one you still need

Lifestyle (everything else)

• Eating out, delivery apps
• Subscriptions
• Shopping, clothing
• Entertainment, OTT, travel
• Gifts
• Upgrades

A useful test: if this expense vanished, would the household still function? Groceries yes. Food delivery no. That test puts most people near a 65–70% essentials ratio — higher than the popular 50/30/20 split suggests, which is normal in Indian urban households with EMIs and school fees.

Step 2 — Find the non-recurring leaks

This is where the money actually goes. Sort one-off expenses into a third pile:

Leak	Typical size	Why it survives
Annual card fee + interest	₹1,000–₹10,000	Charged once, feels invisible
Insurance renewal	₹5,000–₹30,000	Annual, not monthly
Premium upgrade	₹3,000–₹20,000	One bad month triggers it
Festive / wedding spending	₹10,000–₹50,000	Social, hard to refuse
“Small” subscriptions	₹500–₹3,000/month	Individually trivial, collectively large

Subscriptions are the classic. Eight apps at ₹249 is ₹19,992 a year — a meaningful chunk of many beginners’ annual surplus, spent without one decision.

Step 3 — Compute the surplus

Take-home (monthly)          ₹ 80,000
− Essentials                 ₹ 52,000
− Average monthly leaks      ₹  4,500
─────────────────────────────────────
= Monthly surplus            ₹ 23,500

That ₹23,500 is the number to carry forward. Not ₹80,000.

Step 4 — Do the 6-month average

One month is a sample, not a measurement. Repeat the exercise for six months and take the average, because:

• Bonus months distort a single month upward
• Festival months distort a single month downward
• Medical months can distort one month badly upward

Your real surplus is the six-month average, not your best month and not your worst.

What a healthy ratio looks like

There is no single correct split, but these are the ranges that tend to survive contact with a real household:

Bucket	Typical healthy range	Red flag
Essentials	50–70%	Above 75% with no plan to fix it
Lifestyle	15–30%	Above 35% and rising
Savings + investment	10–20%+	Under 5% past age 30

The red flag in the last row is the one that matters. Under 5% invested by your thirties is not a discipline problem — it is usually a debt or income problem, and no amount of motivation fixes it. Work out which before reading another market lesson.

Picture

• Essentials52,000₹
• Leaks4,500₹
• Investable surplus23,500₹

Illustrative example, not this reader's data. The investable bar is the only one that goes to markets.

Three India-specific traps

The credit-card float. A minimum payment on a 40% APR card is not savings, it is a 40% guaranteed negative return. The most expensive money you will ever borrow is the cheapest-looking one. See Debt and loans.

The joint family account. In many Indian households income and expenses are shared, but investing is individual. If you invest against a joint household surplus, the first big family expense takes your shares. Decide explicitly whose surplus funds what.

The EMI-surrounded salaried household. A ₹80,000 take-home with a ₹35,000 home EMI and ₹1 lakh of child schooling has very little surplus — often none. That is not a motivation problem, it is a plan problem, and the answer is usually a longer horizon and a larger income, not a riskier fund.

Failure mode

The most common failure is treating the first month as the truth.

You find ₹28,000, start four SIPs, and month four brings a festival and a medical bill. You now have four SIPs to cancel and a lesson you learned the expensive way.

The six-month average exists to prevent exactly this. It is boring, and it is the reason the plan survives.

The second failure mode is analysing instead of adjusting. You know you spend ₹6,000 a month on delivery. You do not change it, because analysing felt like progress. The surplus only changes if the spending changes.

Exercise

1. Pull 60 days of bank statements (and credit card, if any).
2. Split every transaction into essentials / lifestyle / leak.
3. Compute the monthly surplus.
4. Repeat for a second month and take the average.
5. Find the three largest leaks and write down the rupee amount each is worth per year.
6. Decide: what will you change, and what is the monthly surplus after that change?

Write the new number down. That is your investing budget. Every later decision on this site is sized from it.

Checklist

1. Do I know my take-home, not my gross salary?
2. Have I separated essentials from lifestyle honestly — not aspirationally?
3. Have I found the recurring leaks, not just the big one-off purchases?
4. Is my surplus the six-month average, not my best month?
5. Can I continue this exact amount if the market falls 40% next year?
6. Is anything in my investable pot funded by a credit card or a loan?
7. Do I know which expenses I am actually willing to cut?

Educational only. Not investment advice or SEBI-registered research. Rupee figures are illustrative examples, not quotes or projections.