A 20-year home loan is designed intentionally by banking actuaries to be massively front-loaded with brutal interest charges. During your initial 5 years, over 80% of your monthly EMI is consumed entirely by pure interest, while barely scratching the core principal debt. Home Loan Prepayment (or part-payment) is the ultimate financial weapon to aggressively disrupt this compounding cycle. Whenever you inject lump sums of liquid cash (e.g., annual Diwali corporate bonuses or mature fixed deposits) directly into the loan account, that entire amount strictly violently attacks the remaining base principal. Because your principal violently drops instantly, the bank is legally forced to recalculate your amortization table, resulting in either a drastically reduced future EMI or, ideally, shaving multiple years off your total loan survival tenure.