§ Tools / Series 03 · Personal finance
Step-Up SIP Calculator
The realistic version of long-term investing: a top-up SIP whose monthly contribution rises every year with your salary. For a starting amount, an annual step-up, a return, and a tenure it returns the corpus. And, unlike most free tools, it shows you exactly how much of the bigger corpus is extra principal versus extra compounding, and what your monthly SIP grows to.
§ Market-linked, not a fixed-rate product
This projects rising periodic investing under an assumed return. Equity returns are not guaranteed and the smooth curve is not a forecast. For a flat contribution use the SIP calculator; to solve a target from day one, the goal-based SIP calculator.
4
Modes
Loop
Not closed-form
3-way
Comparison split
2-dir
Goal-solve
v1
Methodology
§ Start with a preset
Three starting points, adjust anything after.
Showing the four reference inputs. Switch to Advanced for currency, frequency, fixed-₹ step-ups, caps, lump sum, and drags.
Step-up SIP corpus
₹6,178,090.72
₹15,000 monthly stepping up 15%/yr for 10 years at 12%. By year 10 you invest ₹52,768 per month.
Total invested₹3,654,669
Estimated earnings₹2,523,421
Final month SIP₹52,768
§ Step-up vs regular SIP
What the step-up adds over the same starting amount, flat
Regular flat SIP
₹3,485,086
invested ₹1,800,000
Step-up SIP
₹6,178,091
invested ₹3,654,669
1.77× the flat corpus
Extra corpus from stepping up
+₹2,693,005
=
Extra principal you invested
₹1,854,669
69% of the gap
+
Extra compounding on it
₹838,335
31% of the gap
The bigger corpus is real, but most of it is usually just principal you put in. The step-up's own contribution is the compounding on that extra principal. This calculator surfaces the split so the headline number is honest.
Y0Y2Y4Y6Y8Y10
Step-up SIP Regular flat SIP Step-up advantage
Growth multiple
1.69×
corpus / invested
Absolute return
69.0%
earnings / invested
Average contribution
₹30,456
across 120 periods
Money-weighted (XIRR)
12.81%
right measure for rising flows
After-fee corpus
₹6,178,091
no fee modeled
Periodic rate
1.0000%
per monthly · nominal
§ Contribution trajectory
What your monthly SIP grows to: ₹15,000 → ₹52,768
Monthly monthly contribution per year · the dashed line is the flat SIP that never moves.
§ Invested vs earnings
How much of the corpus is your money vs market growth?
Y0Y2Y4Y6Y8Y10
Total invested Estimated earnings
§ Goal-solve · both directions
Hit a target corpus: solve the starting SIP, or solve the step-up rate
₹
Holding step-up 15%/yr, return 12%, tenure 10y.
Required starting monthly SIP
₹22,500
≈ 22,500 ones · ends at ₹79,152/month · reaches ₹9,267,136
§ Scenarios
Bear, base, bull: 4% either side of 12%
Bear8.0%
₹5,123,266
Base12.0%
₹6,178,091
Bull16.0%
₹7,542,954
§ Sensitivity
Return × step-up rate: the corpus across nearby assumptions
| Return ＼ Step-up | 5% | 10% | 15% | 20% | 25% |
|---|---|---|---|---|---|
| 9.0% | ₹3,548,815 | ₹4,345,772 | ₹5,362,531 | ₹6,657,776 | ₹8,304,058 |
| 10.5% | ₹3,848,394 | ₹4,685,903 | ₹5,750,870 | ₹7,103,492 | ₹8,818,110 |
| 12.0%base | ₹4,180,413 | ₹5,061,489 | ₹6,178,091 | ₹7,591,990 | ₹9,379,392 |
| 13.5% | ₹4,548,756 | ₹5,476,678 | ₹6,648,634 | ₹8,128,038 | ₹9,993,029 |
| 15.0% | ₹4,957,789 | ₹5,936,129 | ₹7,167,483 | ₹8,716,973 | ₹10,664,752 |
§ Year-by-year schedule
The rising monthly amount, year by year
| Year | Monthly amount | Invested this year | Growth | Closing |
|---|---|---|---|---|
| Y1 | ₹15,000 | +₹180,000.00 | +₹12,139.92 | ₹192,139.92 |
| Y2 | ₹17,250 | +₹207,000.00 | +₹38,329.06 | ₹437,468.98 |
| Y3 | ₹19,837 | +₹238,050.00 | +₹71,537.06 | ₹747,056.04 |
| Y4 | ₹22,813 | +₹273,757.50 | +₹113,208.71 | ₹1,134,022.25 |
| Y5 | ₹26,235 | +₹314,821.12 | +₹165,055.20 | ₹1,613,898.58 |
| Y6 | ₹30,170 | +₹362,044.29 | +₹229,100.45 | ₹2,205,043.32 |
| Y7 | ₹34,696 | +₹416,350.94 | +₹307,735.06 | ₹2,929,129.32 |
| Y8 | ₹39,900 | +₹478,803.58 | +₹403,779.34 | ₹3,811,712.24 |
| Y9 | ₹45,885 | +₹550,624.12 | +₹520,556.82 | ₹4,882,893.17 |
| Y10 | ₹52,768 | +₹633,217.73 | +₹661,979.81 | ₹6,178,090.72 |
§ Formula trace
- startingContribution = 15000 × ones = 15000.00 INR / monthly
- periodicRate = R_net / 12 = 1.000000% (R_net after 0% fee)
- periods N = 10 × 12 = 120 · 1×/yr step-up · beginning-of-period
- scheduled[p] = 15000 × (1 + 15.00%)^stepIndex · stepIndex = floor(p / 12)
- futureValue = 6178090.72 · totalInvested = 3654669.28 · earnings = 2523421.44
- finalContribution = scheduled at last period = 52768.14 per monthly
- extraCorpus = FV(step-up) − FV(flat) = 2693004.58
- = extraInvestedPrincipal 1854669.28 + extraEarningsFromStepUp 838335.29
- moneyWeightedReturn (XIRR) ≈ 12.81%
§ Input audit
annualStepUpPctused
contributionused
contributionUnitused
currencyused
expectedReturnPctused
feePctdefaulted
fixedStepUpAmountdefaulted
frequencyused
inflationPctdefaulted
initialLumpSumdefaulted
initialUnitdefaulted
maxStepUpCountdefaulted
misseddefaulted
rateConventionused
returnVariancePctused
stepUpCapAmountdefaulted
stepUpFreqdefaulted
stepUpTypedefaulted
taxPctdefaulted
tenureYearsused
timingused
§ Warnings
- Of the extra corpus from stepping up, ≈69% is simply principal you invested, only ≈31% is extra compounding. A bigger corpus partly reflects bigger inputs.
- Equity returns are not guaranteed. The smooth projection is not a forecast; tax and fee handling are simplified.
§ Golden references · locked in tests
Reference case: ₹15,000/month, 15% annual step-up, 12% return, 10 years, beginning-of-month, nominal APR.
Future value
₹61,78,090.72
Total invested
₹36,54,669.28
Final monthly
₹52,768.14
Extra corpus vs flat
₹26,93,004.57
Of that ₹26,93,004.57 extra corpus, ₹18,54,669.28 is extra principal and only ₹8,38,335.29 is extra compounding. End-of-month gives ₹61,16,921.51; reading 12% as effective-annual gives ₹59,98,399.86, same inputs, different convention.
§ Specialized siblings
§ Same engine, headlessly
The simulation loop, the regular-SIP comparison, and the two-direction goal-solver are reachable as stateless REST endpoints and MCP tools. Premium ticker prefill sits behind scoped API keys. Workbook CRUD is authenticated under calculator_id=step_up_sip.
POST/api/v1/financial-calculators/step-up-sip/calculate
POST/api/v1/financial-calculators/step-up-sip/run · alias
GET/api/v1/financial-calculators/step-up-sip/schema · /defaults
GET/api/v1/financial-calculators/step-up-sip/return-defaults?symbol=SPY · premium
MCP tools
calculate_step_up_sip · compare_step_up_sip_vs_regular_sip · solve_step_up_sip_goal · explain_step_up_sip_formulamethodology_version = financial-calculators.v1 · canonical = /en/tools/step-up-sip-calculator
§ FAQ
Four things worth knowing
Q01How much does my monthly SIP actually grow to?+
That is the eye-opening output. A ₹15,000/month SIP stepping up 15% a year ends the tenth year at ₹52,768.14/month, because year 2 is 15,000 × 1.15 = 17,250, year 3 is 19,837.50, and so on. The trajectory chart plots every year, and finalContribution is a first-class number, not a footnote.
Q02The step-up corpus is way bigger: is that all compounding?+
No, and this calculator refuses to let you believe it is. In the reference case the step-up corpus is ~77% larger than the flat SIP, but of the ₹26.93 lakh extra, ₹18.55 lakh is simply extra principal you invested, only ₹8.38 lakh is extra growth from compounding the larger contributions. The comparison splits the gap into extraInvestedPrincipal vs extraEarningsFromStepUp so the "step-up is magic" copy can not hide the inputs.
Q03Why a simulation loop instead of a formula?+
Because closed-form geometric-series formulas exist for a clean percentage step-up, but they break the moment you add a contribution cap, a fixed-rupee step-up, a maximum number of step-ups, missed months, or a non-yearly step-up frequency. The period-by-period loop handles all of those on one codepath, and with the step-up set to zero it reproduces a flat SIP exactly.
Q04Percentage step-up or fixed-rupee step-up: which should I use?+
Percentage scales with your salary: "raise my SIP 10% every year". Fixed-rupee adds the same amount each step: "add exactly ₹2,000/month every year regardless of base". Both are supported in Advanced mode, and both flow through the same loop, the same comparison, and the same goal-solver.