Should a family run one SIP or one SIP per goal?
One folio and two folios are an account question. The planning question is the date. An education bill in year ten and a retirement corpus in year twenty are not one SIP, even if the same person pays both. Combining them makes a larger number that you will raid when the first bill arrives.
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What is available in year 10
Bar chart of an education-only SIP at year 10 beside a combined family SIP at year 10, both at an assumed 10%.
- Education SIP₹16.52 lakh
- Combined SIP₹30.98 lakh
The maths of one rate does not make one goal
If two SIPs share a rate, a start date, and a tenure, splitting ₹15,000 into ₹8,000 and ₹7,000 does not change the total future value. The SIP calculator is linear in the instalment. The folio count is not where the result comes from.
The goals here do not share a tenure. School fees are a year-10 event in this sketch. Retirement is year 20. A single 20-year SIP hides the year-10 withdrawal.
Year 10 is when the combined folio gets spent
₹8,000 for 10 years at an assumed 10% invests ₹9,60,000 and ends near ₹16,52,416. That is the education pot. ₹7,000 for 20 years invests ₹16,80,000 and ends near ₹53,59,878. That pot is untouched at the fee date if you actually kept it separate.
₹15,000 for 10 years ends near ₹30,98,280. It is larger because you contributed the retirement instalment as well. Take the fees from it and the retirement clock restarts with whatever you did not spend. ₹15,000 for the full 20 years, with no withdrawal, would end near ₹1,14,85,454. That number assumes you did not pay the school.
Separate goals can still sit in one account
You can keep two mandates and one login. The point is a label and a standing amount you do not sweep. “Family SIP” as a single instruction with no split is how the education bill becomes a retirement withdrawal.
Inflation belongs on the education cost, not as a vibe. If you know today’s fee, the inflation goal calculator turns it into a future cost and a SIP. The ₹8,000 here is an instalment, not a fee quote.
- Same end date: one SIP or two does not change the maths.
- Different end dates: model each date.
- Do not quote the 20-year combined corpus if year 10 spends it.
Whose name is on the folio is a different question
A parent paying, a spouse paying, or a minor’s folio is an ownership and tax question this calculator does not answer. Clubbing and gifts are not computed here. The cash-flow point stands either way: money for a nearer goal should not be the only pot.
Rerun both SIPs at 8% if either goal has a date you cannot move. The 10% is an assumption, and a fall in year 9 is a bad time to discover the school pot was also the retirement pot.
Worked example: school in year 10, retirement in year 20
Both rates are an assumed 10%, start of month, before tax. The combined row is what people quote when they ignore the fee date.
| Item | Figure |
|---|---|
| Education SIP | ₹8,000 for 10 years |
| Education value | about ₹16,52,416, invested ₹9,60,000 |
| Retirement SIP | ₹7,000 for 20 years |
| Retirement value | about ₹53,59,878, invested ₹16,80,000 |
| Combined at year 10 | ₹15,000 a month, about ₹30,98,280 |
| Combined if nothing is spent for 20 years | about ₹1,14,85,454 |
Keep the ₹8,000 pointed at the fee and the ₹7,000 pointed at retirement. The ₹1.15 crore appears only if the fee is paid from somewhere else.
Sources
Results from FinanceChacha are estimates for planning, not financial or tax advice. Read the disclaimer.
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