Financial freedom calculator: test a plan end to end

What the financial freedom calculator answers

Most retirement tools answer one half of the question. A SIP calculator stops on the day you retire; an SWP calculator starts on it. The financial freedom calculator puts both on one timeline: an initial corpus and a SIP that rises every year build the money, then a monthly income that rises with inflation draws it down. The answer is whether the money lasts as long as you need it to.

It works forwards from a plan you choose. If you would rather start from your spending and have the calculator size the SIP for you, the retirement calculator does that instead.

The two groups of inputs

The inputs are split under two headings, Accumulate and Withdraw.

Two details matter. The income is entered in today's rupees; the calculator inflates it to the year you retire and then raises it by the inflation rate every year after. And there are two return rates, because a corpus you are drawing from is usually held in a safer, lower-returning mix than one you are still building.

The results and the Nominal / Today's ₹ switch

Three cards sit at the top:

• Corpus at retirement, with the other unit underneath ("≈ … today" or "… nominal").
• Corpus lasts, shown against your goal. If the money outlives the withdrawal period it reads, for example, "25+ yrs".
• Total withdrawn, again in both units.

A switch above them flips every figure between Nominal (future rupees) and Today's ₹ (adjusted for inflation). Under the cards, one sentence sums up the plan, and below that come a chart, Corpus: build-up, then draw-down, with a Retire marker, a year-by-year table and a donut of what builds the corpus.

A worked example with the defaults

Leave every input as it is. The calculator shows:

The summary line reads that investing ₹20,000 a month, rising 10% a year, on top of ₹5 lakh for 20 years builds ₹4.52 crore, and that drawing ₹50,000 a month in today's money leaves ₹6.73 crore across the full 25-year horizon. In today's rupees that leftover is ₹48.93 lakh.

The footnote shows what ₹50,000 today means in year 21: ₹1.60 lakh a month at retirement, rising 6% a year from there. Of the ₹4.52 crore corpus, ₹1.42 crore is money put in (the ₹5 lakh plus every SIP instalment) and the rest is growth.

Which inputs break the plan

Change one default at a time and watch the Corpus lasts card:

The step-up is doing much of the work in the default plan. Without it the SIP stays at ₹20,000 for 20 years and the corpus is about ₹2 crore smaller. Retiring five years earlier hurts twice: less time to build, and a smaller income at the start that still has to last 25 years. When a plan falls short, the summary line says how many years the money lasts and suggests the three levers: raise the SIP, retire later, or trim the income.

The 35-year row is the one to look at if you plan to stop working early. The default plan that comfortably covers 25 years runs out about eight months short of 35. FIRE in India works through what a 40-something retirement needs, and how a yearly raise builds a bigger corpus shows what a step-up did with real NAVs.

What the calculator assumes

1. Constant returns in each phase. Real markets do not deliver 12% and then 8% smoothly, and the order matters most just after you retire. See sequence-of-returns risk.
2. One inflation rate for both income and the today's-rupees view. Your own costs, healthcare especially, may rise faster.
3. Monthly compounding. Each phase's return is divided by 12; SIP instalments go in at the start of each month and withdrawals come out after that month's growth.
4. No tax. Withdrawals are before tax, and returns should already be net of fund costs.
5. Withdrawals from one pot. In practice an income may come from EPF, NPS, rent and funds in a chosen order; which pot to draw first covers that.

The calculator avoids a fixed withdrawal rule such as 4% of the corpus. It simulates the drawdown under your own return and inflation, so you can check where the 4% rule would have put you.

Where it fits

Use the financial freedom calculator to compare whole plans: a larger SIP against a later retirement, or a lower income against a longer horizon. To model only the build-up, use the step-up SIP calculator; for only the drawdown, the SWP calculator. If you are starting late, starting retirement savings at 40 sets out the trade-offs. None of these figures is a recommendation on how much to save or where.