Stock Market · Mind over Markets

Mental accounting

Mental accounting is the tendency to treat money differently based on where it came from, where it's kept, or what it's earmarked for. A rupee is a rupee, but the brain doesn't believe that.

Classic example

You won ₹50,000 in a lottery. You're happy to spend it on a fancy weekend trip.

Now imagine you SAVED ₹50,000 over 6 months. You'd think twice before spending it on the same trip.

Same ₹50,000. Different mental accounts cause different decisions.

How mental accounting affects investing

1. Treating 'house money' (profits) differently from 'real money' (principal):

• 'I've already made 50% on this stock. The remaining is house money. I can take more risk.'
• In reality, every Rupee is YOUR money. The label doesn't change the math.

2. Holding losers in one account while taking gains in another:

• Trading account is up 20%. Long-term portfolio is down 10%. Net position is flat.
• Mental accounting treats these as separate when economically they're combined.

3. Year-end tax-saving rush:

• 'I need to invest ₹1.5 lakh in ELSS before March', even when fundamentals suggest waiting.
• The 'tax saving bucket' makes investors take suboptimal decisions to fill an arbitrary mental category.

4. Bonus money vs salary money:

• Bonus often gets spent on vacations, gadgets, jewellery
• Salary gets carefully budgeted
• Both are equally 'real' Rupees

> Treating money differently based on its source or label causes systematic suboptimal allocation across your total wealth.

The unified view

Periodically (quarterly or annually) view your TOTAL net worth as one number:

• All bank accounts
• All investment accounts
• All trading accounts
• All retirement accounts

Optimise across this total, not within mental sub-categories.

Tax planning

Tax-saving instruments (ELSS, PPF, NPS) often live in their own mental account. Investors hold them rigidly even when better alternatives exist. Evaluate them as part of your overall portfolio, not as a separate compulsion.

Behavioural use of mental accounting

While mental accounting is generally a bias, you can leverage it positively:

• Separate 'emergency fund' (don't touch for non-emergencies)
• Separate 'retirement corpus' (locked psychologically against impulse use)

These behavioural separations help discipline, even though they're economically equivalent to a single account.

Takeaway. Mental accounting treats money differently based on source, account, or label. Causes suboptimal decisions like spending bonuses freely while pinching salary. View total net worth as ONE number. Use mental categories deliberately for discipline (emergency fund), not unconsciously.