Mental Accounting: The ₹10,000 Monthly Lie

The Brain’s Hidden Buckets

There is a moment most salaried professionals know well. Salary credited. A brief sense of relief. Then, almost automatically, comes a dinner out, a subscription renewal or perhaps a gadget upgrade. The month moves quickly. By the 28th, the familiar question returns: Where did it all go?

Behavioural economist Richard Thaler used the term mental accounting to explain why people tend to categorise and treat money differently depending on where it comes from or the label attached to it. Instead of treating all money as interchangeable, we often divide it into invisible buckets such as salary, bonus, gift or refund. Each bucket then acquires its own rules about how freely the money can be spent.

For many young earners, salary becomes the spending account almost by default. Savings sit in another mental bucket, something to be dealt with next month, after the next increment or at a later stage of life.

A 2026 study published in Discover Psychology, based on 328 working individuals in Goa, found that mental accounting significantly influenced consumptive behaviour. Digital-wallet use also influenced mental accounting, although the study did not find a significant direct effect of digital wallets on consumption. The distinction matters. Digital payments may make transactions more convenient, but how people mentally organise their money remains an important part of the spending decision.

The Salary Arrives. The Month Decides Everything.

India’s household spending patterns show why these small decisions matter. The National Statistics Office’s Household Consumption Expenditure Survey 2023-24 estimated average monthly per-capita consumption expenditure at ₹4,122 in rural India and ₹6,996 in urban India.

At the same time, household financial savings have come down from the unusually high levels seen during the pandemic. RBI data show that net household financial savings fell to 5.2% of gross national disposable income in 2022-23 from 7.2% a year earlier.

For an individual, the lesson is simpler than the macro numbers. Salary arrives, expenses begin and saving often gets whatever is left. Mental accounting can reinforce this pattern because money sitting in the salary account is easily treated as available to spend.

The Rs 10,000 That Changes Everything

Consider two people. Same salary, same city, similar starting point.

Person A spends through the month and saves whatever remains. Some months, ₹10,000 may be left. In others, there may be very little or nothing. Person B sets aside a fixed amount at the beginning of the month, before discretionary spending starts, and manages the rest of the month with what remains.

Over time, the difference is not simply the amount saved in one month. It is the habit created by repeating the decision. The amount is secondary. The sequence is the point.

India’s growing systematic investment culture reflects this idea. AMFI data show that SIP contributions rose from ₹43,921 crore in FY2016-17 to about ₹3.50 lakh crore in FY2025-26. Monthly SIP contributions reached ₹32,087 crore in March 2026.

These numbers do not tell us what return any individual investor will earn. They do, however, show the scale at which investors have adopted recurring, pre-committed investing instead of waiting to see what remains at month-end.

Instant Gratification: The Invisible Thief

Mental accounting is not the only behavioural force at work. There is also present bias, the natural preference for a reward today over a potentially larger benefit in the future.

A new phone, a holiday or a night out is immediate and easy to picture. A retirement corpus 20 years away is abstract. The benefit of spending is felt today; the benefit of saving may not be visible for years.

This is not a character flaw. It is simply why long-term wealth building can be difficult. It requires choosing the future over the present repeatedly, often without any visible short-term reward.

If saving depends on making the right decision at the end of every month, it has to compete with every spending opportunity that came before it. Structure can make that choice easier.

The Lifestyle Trap Nobody Sees Coming

As income rises, expenses have a habit of rising with it.

A modest salary feels tight. Then comes an increment, followed by a better phone, a larger apartment, a vehicle loan or more spending on convenience. Improving one’s lifestyle as income grows is not inherently a problem. The difficulty begins when every increase in income is absorbed by higher recurring expenses.

Net financial savings of Indian households fell to ₹14.16 lakh crore in 2022-23 from ₹17.12 lakh crore a year earlier. But a national savings trend has many causes and cannot be attributed to lifestyle inflation alone.

At a personal level, however, the pattern is easier to spot. If income keeps rising but savings do not, lifestyle inflation may be consuming the difference.

Save First: The Oldest Habit in Wealth Building

One simple principle cuts through much of this:

• Income minus Savings = Expenses rather than:

• Income minus Expenses = Savings

Saving first means deciding on an amount and setting it aside before discretionary spending begins. Automating that decision reduces the need to make the same choice afresh every month.

This does not mean everyone should save ₹10,000, nor does it mean squeezing essential expenses to meet an arbitrary target. The appropriate amount depends on income, obligations, emergency needs, goals and individual circumstances.

The behavioural shift is to stop treating saving as what happens only if money is left over.

Mental accounting itself can then work in your favour. Instead of allowing the brain to label salary simply as money available to spend, you can deliberately build buckets for an emergency fund, retirement, children’s education, a home or other goals. Money gets a purpose before the rest of the month competes for it.

A pre-committed monthly investment does not remove market risk, guarantee returns or replace the need to choose suitable investments. What it can do is bring structure and consistency to a decision that is otherwise easy to postpone.

That is the real lesson behind the ₹10,000 monthly lie. The number is only an example. The important decision is the order: save first, spend deliberately and increase the amount as income and circumstances permit.

Long-term wealth is rarely built by one dramatic financial decision. More often, it is shaped by ordinary monthly decisions repeated over many years.

Sources

• Thaler, R.H. (1999). Mental Accounting Matters. Journal of Behavioral Decision Making, Vol. 12, No. 3, pp. 183-206.

• National Statistics Office. Household Consumption Expenditure Survey 2023-24. Ministry of Statistics and Programme Implementation.

• Reserve Bank of India. Household financial savings data.

• Association of Mutual Funds in India. SIP Contribution Data, FY2016-17 to FY2025-26.

• Sukthankar, S., Fernandes, R., Korde, S. et al. (2026). Evaluating the impact of financial and behavioural determinants on consumptive behaviour through the mediating role of mental accounting. Discover Psychology.

• National Statistics Office. National Accounts Statistics 2024, Ministry of Statistics and Programme Implementation.

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AMFI REGISTERED MUTUAL FUND DISTRIBUTOR & SIF DISTRIBUTOR (ARN 0155)

Disclaimer: This is partner content published as part of Outlook Money’s association with NJ Wealth. The views expressed are those of the author. This article is for investor education and does not constitute investment advice. Securities-market investments are subject to market risks. Read all relevant documents carefully and consult an appropriately registered financial professional where required.

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