Goal Planning in Future Rupees

Two things sit under that line. First, a goal has a cost that changes with prices, and the longer the date, the more it changes. Second, a goal is either fixed in date or loose. A school fee cannot move. A holiday can. Fixed goals need the safest money; loose ones can wait out a bad market. Module 4.6 sets the equity ceilings by horizon, 20%, 40%, 60% and up to 90%, and I do not repeat them here. This module is the arithmetic that comes before them: how big the goal is, and how much to put in each month.

The latest all India number comes from the National Statistics Office, MoSPI, on the new base year 2024=100. Its press release of 12 Oct 2026 puts retail inflation for September 2026 at 5.54% over September 2025 (provisional), against 4.83% for August 2026 (final). Food inflation was 7.74% in September. These are one month each. The Reserve Bank of India's Monetary Policy Statement of 7 Oct 2026 projects CPI inflation at 5.2% for 2026-27, with quarterly paths of 4.9%, 6.0% and 5.7%, and 5.6% for Q1 2027-28. It calls the risks to the Q1 2027-28 figure evenly balanced.

Inflation is not one number for every family. The same MoSPI release gives the year on year rate by division for September 2026, combined sector, provisional:

Read the education rows with care. They measure the education component of a national basket of what households pay, one month against the same month a year before. They do not measure the fee of the institution you have in mind, which can be set far apart from the basket and can change in steps. I found no other verified series of education fee inflation for India, so the CPI group is the only education rate this module uses. For a specific course, use the fee schedule that institution has published and how it has moved, and treat the CPI group as a floor for the comparison and not a forecast.

That spread is the honest message. A goal 12 years away has an uncertain size, and a plan that picks one number hides it. The way I handle it is to plan on the middle case and name what happens at the ends: at the high case the monthly amount rises, and at the low case there is a surplus to put to the next goal.

Conventions matter. Many calculators divide the yearly rate by 12 and assume the instalment is paid at the start of the month. Both choices raise the answer. For ₹10,000 a month at 12% for 15 years, the convention used above gives ₹47.15 lakh, and the divide by 12, start of month version gives ₹50.46 lakh. The difference, about ₹3.3 lakh, is arithmetic and not performance. Before comparing two results, find out which convention each used. The Learn SIP calculator uses the one above.

Notice how much the return assumption matters: two percentage points move the monthly figure by ₹2,430, or 14%. A SIP does not create a return. It fixes the amount and timing of what goes in, and leaves the return to the market. The right use of the formula is to see the range: what is needed if returns are 8%, 10% and 12%, and whether the high end of that range can be afforded.

With P = ₹10,000, g = 5%, r = 10%, N = 10: i = 0.0079741, so A = 0.10 / 0.0079741 = 12.5405. The bracket is (2.59374 - 1.62889) / (1.10 - 1.05) = 19.2970. So FV = 10,000 x 12.5405 x 19.2970 = ₹24,19,942. The flat SIP of the same starting amount gave ₹19,98,639. The step up version puts in ₹15,09,347, against ₹12,00,000, and ends with ₹4.2 lakh more.

The inverse gives the starting amount for a goal. For the ₹47.75 lakh goal at 10% over 12 years: the flat SIP is ₹17,805; a 5% yearly step up starts at ₹14,180; an 8% step up starts at ₹12,277. The lower start is real, and it is paid for later. In year 12, the 8% step up SIP pays 12,277 x 1.08 to the power 11, about ₹28,600 a month. The plan works only if income rises as fast as the step up does.

The Learn step up SIP calculator and goal planner run the same sums with a chart.

Put numbers on it. You have ₹12 lakh today and expect 10% a year. Invested at once, it is ₹13.2 lakh after twelve months. Spread as ₹1 lakh a month over those twelve months, with the unspent part earning nothing, it is ₹12.54 lakh, which is ₹66,000 less. Carry both for the rest of 12 years and the lump sum is ₹37.66 lakh against ₹35.78 lakh. The cost of waiting is about ₹1.9 lakh, 16% of the ₹12 lakh, by year 12. It is that large because the unspent part earned nothing; money parked in a deposit meanwhile would narrow the gap.

That expected gain is not a free gain. A lump sum put in just before a large fall loses more than one spread through it. For someone who will find a 30% drop in the first year impossible to sit through, spreading is not a return decision. It is a decision about regret and about the chance of acting badly. It costs something on average, and it buys something in the bad case. The two are worth stating separately.

Most salaried people do not face the question. Their money arrives monthly, and the SIP is the schedule on which it exists. For them the practical question is not lump sum or SIP but whether the monthly amount is the right size, which the formulas above answer. The Learn lump sum against SIP tool shows the two paths for your own inputs.

Two mistakes sit here. The first is one pot for everything, so the fee due next year shares money with retirement. The second is a pot with no owner: money that was meant for the down payment gets spent because nothing says what it is. Name each pot, write the amount and the date, and keep the pots in separate accounts or folios where the platform allows it.

The bucket also tells you where a shortfall should be fixed. A goal that can move can wait out a bad market. A fixed goal cannot, so it gets the earlier and larger saving.

An illustration, not a forecast. A portfolio stands at ₹15 lakh a year before the goal date. The last year brings +30%, or -30%. The first lands at ₹19.5 lakh and the second at ₹10.5 lakh, a gap of ₹9 lakh, with the same size of move in either direction. The ₹1.2 lakh that a ₹10,000 SIP adds in that last year cannot close it.

The remedy is a glide path, which lowers the equity share as the date nears. Take a teaching stress in which equity falls 40% in a year and debt gains 6%. On that rule a 90% equity portfolio falls 35.4% (90% x -40% plus 10% x 6%), a 60% equity portfolio 21.6%, 40% equity 12.4%, and 20% equity 3.2%. That is the logic behind the horizon ceilings in Module 4.6: the nearer the goal, the less equity the date can bear.

A glide path also has a cost. Lower equity earns less on average, so a goal that glides is funded by a higher monthly amount than one that stays in equity. That is the price of lowering the chance of a ruined date. Whether to pay it depends on how fixed the goal is, which is why the bucket table comes first.

A worked review. The education goal has run 3 years on ₹17,805 a month. The plan assumed 10% a year and the pot should be ₹7.39 lakh. Weak markets left an average of 4% a year over those 3 years, and the pot is ₹6.79 lakh, a funded ratio of 92%. The goal is still ₹47.75 lakh at 12 years. With 9 years left and the pot growing at the plan's 10% from here, the monthly amount needed is ₹18,635, which is ₹830 more, 4.7%. If the same average had come with a full 3 years at 0% return, the pot would be ₹6.41 lakh and the need ₹19,163.

Change the saving first, the date second and the return assumption last. Raising the monthly amount is in your hands. Moving the date is possible for loose goals. Lifting the return you expect because you need it is the one change that has nothing behind it.