When a higher monthly payment can work
Increasing what goes towards the loan every month is the most direct method there is. More of each payment reaches the principal, the outstanding balance falls faster than the original schedule assumed, and because interest is charged on a reducing balance, both the tenure and the future interest come down as a result. Depending on your lender, the higher amount may be arranged as a revised EMI or as a regular part-payment alongside the existing one.
The catch is not mathematical, it is practical. A permanently higher monthly repayment becomes part of your household's regular commitments, in the same way rent or school fees are. It has to be funded in a month when the car needs work, in a month when someone is unwell, and in a year when your income does not grow the way you expected. That is why this method works best when the monthly surplus behind it is dependable rather than merely available at the moment you decide.
You will find plenty of advice suggesting a fixed step-up — raise the EMI by five or ten per cent every year and be done with it. We would avoid framing it that way. A number chosen in advance knows nothing about your expenses, your liquidity or the goals competing for the same money. The more useful rule is to increase your monthly repayment only to a level that remains comfortable after regular expenses, essential liquidity and important financial goals are provided for.
Do not turn an optional home-loan repayment into a compulsory cash-flow problem.
It is worth sitting with that for a moment, because it is easy to get wrong in a good mood. There is little to celebrate in reducing your tenure by four years if the higher monthly commitment later forces you to stop your investments, borrow for another goal, or run the household without enough money within reach. The loan would finish earlier, and the rest of your financial life would be paying for it.
What to do when your income increases
A salary increase is the most common moment at which people raise their repayment, and it often is the right moment. Higher income can genuinely create more repayment capacity. But the same increase may also need to fund higher living costs, larger retirement contributions, a child's education, the liquidity you never quite got round to building, another goal entirely, or simply a little more flexibility in the present. Not all of it belongs to the loan, and none of it belongs to the loan automatically.
A step-up repayment strategy should follow your growing ability to pay, not a fixed calendar rule.
In practice this means revisiting the repayment amount when your circumstances change rather than on a schedule set years earlier. Let home-loan repayment accelerate with your financial capacity, and it tends to stay comfortable. Tie it to an arbitrary annual percentage, and sooner or later the percentage will arrive in a year when the capacity has not.