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Regular vs step-up SIPs: Do ₹1,000 and 10% annual top-ups give higher XIRR or just a larger corpus?

By TheFinanceBase Team 5 min read

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Short answer: A step-up SIP usually creates a larger ending corpus because you invest more money. It does not automatically produce a higher XIRR (annualised, money-weighted return). In WhiteOak Capital Mutual Fund’s BSE Sensex TRI comparison through 30 September 2026, the regular ₹10,000 monthly SIP had the highest XIRR, while both a fixed ₹1,000 annual increase and a 10% annual increase finished with more rupees.

That distinction matters when you decide whether to increase contributions with your salary. Compare the amount invested, the ending value, the dated cash flows and affordability—not the corpus alone.

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What is the difference between a regular SIP and a step-up SIP?

A regular SIP keeps the instalment unchanged. A step-up SIP increases it at a preset interval, commonly once a year, either by a fixed rupee amount or by a percentage.

Regular SIP

With a ₹10,000 monthly regular SIP, you continue investing ₹10,000 every month. The contribution schedule is predictable, but the instalment may lose purchasing power as income and prices rise.

Fixed-amount step-up

A fixed step-up adds the same rupee amount each year. In the published comparison, the monthly instalment rises by ₹1,000 every year.

Percentage step-up

A percentage step-up increases the then-current instalment. At a 10% annual rate, ₹10,000 becomes ₹11,000 in year two and ₹12,100 in year three. The increase compounds; it is not another ₹1,000 forever.

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Do step-up SIPs give higher returns or just a bigger corpus?

They can give you a bigger corpus without giving you a higher rate of return. A corpus is the final rupee value. XIRR is the annualised money-weighted return calculated from every dated investment and the final value. Adding contributions—especially later in the period—can increase the final amount while leaving XIRR unchanged or reducing it.

That is exactly what the cited Sensex TRI history shows. The regular schedule had the highest XIRR across the reported horizons, but the step-up schedules accumulated more money because substantially more was invested.

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What did the 25-year ₹10,000 comparison show?

Mint reported WhiteOak Capital Mutual Fund analysis of the BSE Sensex TRI through 30 September 2026. These are benchmark-index results, not returns from a named mutual-fund scheme.

Schedule Total invested Current value XIRR
Regular ₹10,000 monthly SIP ₹30 lakh ₹209.90 lakh 13.24%
₹1,000 fixed annual top-up ₹66 lakh ₹318.22 lakh 12.70%
10% annual top-up ₹118.02 lakh ₹413.56 lakh 12.32%

Over this 25-year path, the 10% step-up produced the largest corpus, followed by the fixed ₹1,000 step-up. The regular SIP produced the highest XIRR. The difference is not a contradiction: the step-up plans deployed ₹36 lakh and ₹88.02 lakh more, respectively, than the regular plan.

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What was the XIRR difference over 20 years?

The same published comparison reported lower XIRRs for the increasing-contribution schedules over a 20-year horizon:

Schedule XIRR
Regular SIP 10.81%
₹1,000 fixed top-up 10.72%
10% annual top-up 10.54%

These figures describe that historical benchmark path only. They are not a promise that a regular SIP will beat a step-up SIP in every market or period.

Is a ₹1,000 top-up better than a 10% annual step-up?

Neither is universally better. They scale differently, so the right choice depends on your starting instalment, income growth and ability to continue contributions.

How the schedules diverge

For a ₹10,000 starting SIP, a ₹1,000 fixed increase is 10% in the first year, but the percentage becomes smaller each year as the base grows. A 10% increase remains proportional and compounds: ₹10,000, ₹11,000, ₹12,100, and so on.

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For a ₹1,000 starting SIP, the same fixed ₹1,000 increase doubles the monthly contribution in year two (₹2,000). A 10% increase would make it ₹1,100. Therefore, you cannot transplant the published ₹10,000-start corpus figures to a ₹1,000-start plan; an exact ₹1,000-start historical table was not published.

When each method may fit

  • Fixed amount: easier to budget when you know the rupee amount your income can absorb, but potentially aggressive at a low starting SIP.
  • Percentage: tracks salary growth more naturally and compounds contributions, but can become a large commitment after many years.
  • Regular: simplest to maintain when income is uncertain; you can review and increase it later without promising an automatic annual rise.

How should you compare a regular and step-up SIP?

Use the same assumptions for both schedules, then examine these five measures:

  1. Total contributions: record every instalment and the date it is paid.
  2. Ending corpus: compare the nominal value on the same valuation date.
  3. XIRR: calculate the money-weighted annual return from the dated cash flows, not from the corpus alone.
  4. Sustainability: test whether the increase remains affordable after salary changes, inflation, debt payments and emergency needs.
  5. Real purchasing power: consider inflation. A flat ₹10,000 contribution buys less over time; a sustainable step-up can keep saving closer to rising income.

How do you calculate XIRR without overstating the result?

List each SIP instalment as a negative cash flow on its actual date and the ending portfolio value as a positive cash flow on the valuation date. Use the same benchmark or fund, contribution dates, expense assumptions, taxes and valuation date for every schedule. A spreadsheet’s XIRR function can then annualise the dated cash flows.

Do not treat an illustration as a forecast. SEBI states that stock-market returns do not have a fixed rate and future returns cannot be predicted. Calculator outputs depend on assumed rates and are not guaranteed. AMFI describes SIPs as periodic fixed-amount investing and notes that rupee-cost averaging does not assure profit or prevent losses in falling markets.

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What are the main pitfalls when choosing a step-up?

  • Confusing more money with better performance: a higher corpus may simply reflect higher contributions.
  • Setting an unmanageable percentage: a compounding 10% rise can become difficult during a career break or income shock.
  • Ignoring missed instalments: stopping or reducing contributions changes the cash-flow pattern and the resulting XIRR.
  • Comparing unlike periods: market returns, valuation dates and cash-flow timing must match.
  • Assuming a benchmark equals a scheme: the cited figures are for the BSE Sensex TRI, not a specific mutual-fund product; actual scheme returns also reflect expenses, tracking differences and taxes.

Should you increase your SIP with your salary?

Increase it only when the higher instalment remains sustainable after maintaining an emergency reserve, insurance and required debt payments. A practical rule is to choose a fixed amount or percentage you can continue through a weaker income year, then review it annually. If affordability is uncertain, a smaller increase that you maintain is preferable to an aggressive plan you later stop.

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Frequently Asked Questions

Does a higher SIP amount reduce my XIRR?

Not automatically. XIRR depends on the timing of each contribution and the market value at the end; a higher contribution can raise, lower or leave the rate unchanged. In the cited Sensex history, the increasing schedules had lower XIRRs, but that is not a universal rule.

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Can I change a step-up percentage after starting?

The exact process depends on your mutual-fund platform and mandate. You can generally alter, pause or cancel future instalments, but confirm the cut-off date and mandate rules before the next debit.

Should I use a fixed rupee increase when my starting SIP is small?

Check the increase as a percentage of the starting instalment. A ₹1,000 rise on a ₹1,000 SIP doubles the payment in the second year, whereas a 10% rise makes it ₹1,100; the fixed option may therefore be much more aggressive.

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Are SIP calculator results guaranteed?

No. Regulators and fund providers describe calculators as illustrations based on assumed returns. Market returns vary, and the calculator cannot predict your future XIRR or protect you from losses.

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