Here is a stepbystep to guide, plus calculator, to begin and track longterm goal based investing. Most goal planning calculators tell you how much you should invest. This sheets asks you, how much you can invest and goes about calculating the portfolio return. With that you can calculate the asset allocation required (equity to fixed income ratio). This was first published in May 2013 and is now republished with small modifications.
The calculator will perform the steps detailed below. These steps are applicable for all goals except retirement. For retirement, you can consider using the lowstress retirement calculator (hopefully!)
Steps in brown refer to inputs. Other steps will be performed by the calculator.
 Identify the goal, its timeframe and find out as accurately as possible how much it will cost today (i.e. when you start investing).
 Ballpark estimates can be dreadfully wrong. If you are saving for your child’s education, seek out a parent whose child is studying a decent degree (UG +PG) in a decent college and get the entire fee detail.
 Assume a reasonable inflation rate (not the historical average). The higher the safer.
 Using 1 and 2, determine how much the goal would cost at the time of need.
 Determine how much you can invest after taking into account: expenses, loans, investment towards retirement (always the no. 1 goal).
 Estimate how much this investment amount will increase (or decrease!) in future. If after a loan payout, you can invest more, take this into account.
 You can now determine the average rate of return required. Average here refers to the weighted average of returns from equity and debt instruments. The equity and debt returns themselves represent the expected compounded annualized growth rate (CAGR: a geometric average)
 Depending on the time frame decide the debt instrument. If your goals if 15 financial years or more away then PPF is a good taxfree investment. You could also choose a debt fund like an ‘income’ fund. Estimate the posttax return (say approx. 8% for PPF and 6% for a debt fund).

Decide on appropriate equity exposure. This is how I would do it.
 For goals 15 or more years away: 5070%
 For goals 10 or more: about 4050%
 For goals 7 years away 2030%
This is not just based on my risk appetite. It is based on this study: Equity investing: How to define ‘longterm’ and ‘shortterm’

From 6, 7 and 8 the returned from equity needed can be estimated.
 Anything more than 12% irrespective of time period is risky. Unless you have a good understanding of the market such returns it is best not to assume such high returns.
 12% only for time periods well above 10 years.
 Anything less than 10 years expect something like 910%

If the equity return is too small and if the inflation rate assumed is reasonable you can afford to decrease the monthly investment. If equity return is anything more than 12%, it is best to lower it, irrespective of duration and perhaps expertise. In this case, the investment has to be increased as much as possible.
 Initial monthly investment could be increased and/or
 % by which investment will increase annually (from year 2) can be increased and/or
 Additional investment a few years down the line can be considered.

If you have increased the monthly investment as much as you can and still find the equity returns still unreasonably high, then
 Consider postponing the goal if possible
 If postponement is not possible then the goal can only be met partially
 If the goal can only be partially met, estimate the corpus that can be obtained with a reasonable equity return. The shortfall will have to be met with external funding.
 Finally, you are ready to start investing! Spend no more than a week’s time to get going.
 If you do not have the time or inclination to have a personalized investment strategy, start a SIP.
 You can afford to relax for the first few years. In the meantime, consider learning about
Assume reasonable rates of return for equity and debt. The sooner you start the lower your return expectation from equity. The more you can invest the lower your return expectation from equity.
Statutory warning: Garbage in, garbage out!
Download the StepbyStep GoalBased Investing Calculator (Updated Mar. 2016)
Download the StepbyStep GoalBased Investing Calculator (May 2013)
 Macros need to be enabled. Macro used is derived from Excel Workbook
 A standard goal calculator is also included for comparison.
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can you explain step 10 to 12 with some exaple?
To keep it short, use 810% inflation and only 1012% from equity and about 78% (post tax) from debt
Hi Mr. Pattu, But if the debt return is 78% only wouldn’t it mean that the returns will be negative ? Why do it then..
These are expectations. Lower you expect, less disappointed you will be. The safety cushion of debt is indispensable and cannot be ignored.
Dear PattuSir, this is more useful than the previous version. In this version I can decide the asset allocation percentage which makes it more realistic. There are 2 most important things you have mentioned. And indeed the toughest. The first one is “seek out a parent whose child is studying a decent degree (UG +PG) in a decent college”. It would be great if you kindly request some of your senior readers to write a guest post on this. I have read few of Rajsekhar Roy’s posts from AIFW. The second point is “Assume a reasonable inflation rate”. I think education inflation is the worst, it defies logic. In BITS Pilani (as derived from Rajsekhar Roy’s post) it is around 15% which is quite scary to think about. So I think, if you could arrange a senior reader to write a guest post on education cost and inflation, that will indeed be helpful for readers like us to make meaningful projections.
Thank you. It won’t help much. All we can do is to invest as much as possible. I cannot go beyond 10% inflation regardless of reality. Rest via education loan.
Dear Pattu Sir,
Thanks a lot for your calculators.
I have a question on how Annual increment in monthly investment is used in the calculators. The general advise is to invest more money during early years. But, because the amount required may not be available I understand the idea of systematic annual increment mentioned in your blogs. Let us take an example of 12500(70Equity:30Debt) invested per month for a goal(say education of my child) 25 years away. The investment in the 24th year, assuming 10% increase every year, will be 1250*(1.1)^24 = ~1.23L per month. Does investing such a huge amount so close to the goal with original asset allocation make sense? The general advice is the ratio of Equity:Debt should decrease as one approaches a goal. Is this considered in the calculator? If not, will the impact of annual increase in investment on cushioning the requirements on initial amount to achieve a goal hold?
I honestly don’t have the expertise to create/modify such helpful calculators(and hence don’t know the complexity), but would it help if the calculators have a variable which takes the change in asset allocation? Maybe the equity percentage decreases every year by (initial equity percentage)/(total number of years to goal) or on someother triggers?
Once again, thanks a lot for helping us out with your calculators.
Rgds
RK
You can invest more in debt as the goal nears. Also the only reason for the increase % feature is many will not be able to save as much right away. This is only a rough guideline. Do not read too much into it.