SIP Annual Increase Calculator
SIP with annual step-up contributions.
Project SIP (systematic investment plan) with annual step-up in monthly contributions. Enter starting monthly and increase to see final pot.
What this tool does
This calculator models the growth of a systematic investment plan where your monthly contribution increases by a fixed percentage each year. It compounds your rising contributions across your chosen timeframe, factoring in your expected return rate. The result shows your projected portfolio value at the end of the period. Your starting monthly amount, annual increase percentage, and expected return rate are the primary drivers of the outcome. For example, someone beginning with modest monthly deposits and gradually raising them over five to ten years can see how compounding works on an expanding contribution base. The calculation assumes consistent monthly payments, regular annual step-ups, and a steady return rate applied uniformly across the period. It does not account for taxes, fees, market volatility, or timing of deposits within each month. This tool illustrates mathematical projections for educational purposes only.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
500/month growing 10% yearly for 20 years at 8% return: starts at 500, rising to about 3,058/month by year 20, for a final pot of about 659,350. Annual step-ups mirror salary growth, keeping the saving rate steady as income rises and producing a materially larger pot than flat contributions over long horizons.
Quick example
With starting monthly of 500 and annual increase of 10% (plus years of 20 and expected return of 8%), the result is 659,349.89. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
Which inputs matter most
You enter Starting Monthly, Annual Increase %, Years, and Expected Return.
What's happening under the hood
Simulate month-by-month with annual step-up. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
Where this fits in planning
This is a "what-if" tool, not a forecast. It helps to test ideas: what happens if the rate is 2% lower than hoped, or if you add five more years. The value is in the scenarios you run, not the single answer you get from the defaults.
What this doesn't capture
This is a simplified model that holds its assumptions constant. Real outcomes vary with market conditions, costs, taxes, and timing, so the figure is best read as one scenario rather than a forecast.
Where to go next
This calculation rarely sits alone in a planning exercise. If you're running these numbers, you'll probably also want the compound interest calculator, the wealth building rate calculator, and the investment calculator — each one answers a different question in the same territory. Treating them as a set rather than in isolation usually produces a more honest picture.
With a starting monthly contribution of £500 increased 10% annually over 20 years at 8% expected return, your portfolio reaches $659,349.89.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
This calculator models a systematic investment plan with annual contribution increases through month-by-month simulation. It compounds returns at the expected annual rate, applied monthly, on the accumulated balance. Each year, the monthly contribution amount rises by the specified percentage, effective from the anniversary of the start date. The simulation treats the annual return as constant and applies it uniformly across all months, assuming no interim withdrawals, fees, or tax effects. Results reflect the growth of contributions plus compound returns under these steady-state conditions. Actual outcomes may differ based on market volatility, variable returns, timing of contributions, and any applicable costs or levies not modelled here.
References
Frequently Asked Questions
Realistic 10% annual increase?
Benefit vs flat?
Commonly used by young investors?
How to implement?
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