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Thursday, August 21, 2025

What’s the formulation to find out the corpus from a Step-up SIP?


Final yr, after we revealed the Unified Pension Scheme vs Nationwide Pension Scheme Calculator, many readers have been shocked that we used a single formulation to find out future NPS corpus by treating it as a step-up SIP. Since then, a number of customers of that software have requested us to elucidate the formulation. So listed here are the small print.

A step-up SIP refers to periodic investments the place the invested quantity will increase at some fee. That is technically known as a rising annuity.

SIP formulation

  • SIP = month-to-month SIP quantity. We will multiply this by 12 and think about the corpus from a yearly SIP. For the reason that returns are variable, the distinction between a month-to-month SIP and a yearly SIP is insignificant over time,
  • n = no of years the funding is made
  • r = anticipated fee of return (you’ll be able to account for taxes by suitably decreasing this worth)

Corpus = 12*SIP*[(1+r)^n-1]/r

funding made on the finish of every interval (yr on this case)

Corpus = 12*SIP*(1+r)*[(1+r)^n-1]/r

funding made firstly of every interval (yr on this case)

Right here ^ refers to, to the facility of. x^2 = x*x. 2^3 = 2*2*2 = 8

Step-up SIP formulation

Now, we embrace one other variable

  • g – the speed at which investments improve annually. For instance, if g = 10%, and the preliminary month-to-month SIP quantity is Rs. 1000. After one yr, the SIP quantity is Rs. 1100 and so forth.

Corpus = 12*SIP*[(1+r)^n- (1+g)^n]/(r-g)

funding made on the finish of every interval (yr on this case)

Corpus = 12*SIP*(1+r)*[(1+r)^n- (1+g)^n]/(r-g)

funding made firstly of every interval (yr on this case)

What if g > r?

Many readers marvel if this formulation will work if g >r. The corpus won’t change into unfavourable. It’s because when g>r, the issue [(1+r)^n- (1+g)^n] is unfavourable. However (r-g) within the denominator can also be unfavourable and the indicators cancel off.

There may be, nonetheless, one problem on this formulation.

What if r =g? Then, the denominator turns into zero, and we’ll get a 1/0 zero error, often known as a singularity in math.

When r=g, the next formulation applies for a step-up SIP

Corpus = 12*SIP*n*(1+r)^(n-1)

funding made on the finish of every interval (yr on this case)

Corpus = 12*SIP*n*(1+r)^n

funding made firstly of every interval (yr on this case)

Mess around with these formulae and have enjoyable. If you’re concerned about funding evaluation, monetary planning, monetary advisory, studying, and creating customized variations of calculators, you’ll be able to think about becoming a member of the freefincal investor circle! That is an unique area for buyers, advisors, fintech workers and college students to entry monetary planning and insurance coverage instruments, mutual fund and inventory evaluation instruments, coding methods and Excel macros for information extraction.

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