How EMIs really work

An EMI (Equated Monthly Instalment) is the fixed amount you pay each month on a loan. It stays the same throughout, but what's inside it changes dramatically over time, and that's the part most people never see.

The hidden split

Every EMI is part interest (the bank's charge) and part principal (your actual loan shrinking). Early on, the balance is large, so most of your EMI is interest. As years pass, the balance falls and the mix flips toward principal.

Share of each EMI going to interest (red) vs principal (green), over a loan's life

Why this matters

Because in the early years, a large chunk of what you pay never touches the loan. It's pure interest. This is exactly why prepaying early is so powerful: an extra payment in year one wipes out principal that would otherwise have generated interest for two decades. The same prepayment in year eighteen barely moves anything.

The rule that falls out of the chart: the earlier a prepayment, the more it saves. Time is the ingredient interest feeds on. Removing principal early starves it.