
Short answer: A common rule: under one month’s take-home, kept for 3+ years. EMIs on depreciating gadgets deserve extra suspicion.
A common and reasonable ceiling is one month's take-home pay, for a phone you intend to keep three years or more. On ₹50,000 take-home that is a ₹50,000 phone — which, spread over three years, costs about ₹1,390 a month.
Price per month is the honest number
| Phone price | Kept 2 years | Kept 3 years | Kept 4 years |
|---|---|---|---|
| ₹20,000 | ₹833/mo | ₹556/mo | ₹417/mo |
| ₹50,000 | ₹2,083/mo | ₹1,389/mo | ₹1,042/mo |
| ₹1,20,000 | ₹5,000/mo | ₹3,333/mo | ₹2,500/mo |
The length of ownership moves the cost as much as the price does. A ₹1,20,000 phone kept four years costs less per month than a ₹50,000 phone replaced every two.
On no-cost EMI
It is rarely costless. The interest is usually folded into the price, the cash discount you would otherwise have received disappears, and GST applies to the full amount. More importantly it decouples the decision from the balance — the question becomes "can I afford ₹4,167 a month" rather than "is this worth ₹50,000", and those produce different answers. If you would not buy it outright, the EMI has not made it affordable; it has made it easier to not notice.
What actually justifies spending more
Longer software support is the one specification that reliably converts into value, because it is what determines whether the phone is still usable in year four. Battery and camera matter if you use them daily. Processor benchmarks, past the mid-range, do not change anything most people do with a phone.
The real rule
Buy it from savings, not from an EMI, and keep it until it stops working well rather than until a new one launches. Both halves matter — the first keeps it inside the budget, the second is what makes it cheap.
Put numbers to it with the free budget calculator and emergency fund calculator — no sign-up, works on any phone.
