There are many ways to calculate saving rate.

**= $***Saving Rate***/$***SAVED***. Various debates exist around each terms. Items up for decision:***IN*- Should we use Pre-tax or post-tax as the $
?*IN* - Should we look at the family as a whole or per person?
- Should we use House payment/debt (the portion
other than the interest on loan) as $
?*SAVED* - Should we use Interest received as $
& $*SAVED*?*IN* - Should we recognize DB accrued as $
& $*SAVED*?*IN* - Should we include Social Security (CPP/QPP contribution)?
- Should we set a Saving Rate or set a retirement goal.

Let’s go deeper in the rabbit hole of Interest on Saving. Including Interest will have the immediate effect of increasing your saving rate. At the basic level, including/excluding anything do not change your retirement date or how much actual earning you save. However, if by including or excluding some items some features may be highlighted or new strategy can be discovered.

Interest is define for this article as the total return of your retirement fund regardless of its origin (growth of stock, dividends or coupon). Compounding interest informs us that interest will exponentially grow as time passed. Near retirement, interest will largely outgrow our saving. Why save at all, if you save 2,000$ while the fund grows 200,000$ due to interest?

Interest is define for this article as the total return of your retirement fund regardless of its origin (growth of stock, dividends or coupon). Compounding interest informs us that interest will exponentially grow as time passed. Near retirement, interest will largely outgrow our saving. Why save at all, if you save 2,000$ while the fund grows 200,000$ due to interest?

After including the interest both in the $

**& $***SAVED***, I’ve created ways to reduce the amount saved from earnings while the Interest grew. Given a fixed saving rate, this has the effect of delaying retirement by a few years. Thus the below strategy are more in-line for those who would like to be Financially Independant(FI), but not Retire Early. Get a higher raise than your boss wants to!***IN*"Get a higher raise than your boss wants to!"

**Tweaks & issues**

The overall objective of the methods proposed below are to
decrease saved earnings while reaching retirement. Thus this has the positive
impact of giving you a bigger raise than your employer gives you.

This strategy makes more sense if you increase your your replacement ratio. A 60%-70%, or (1-Saving Rate)% would not work as you expect to spend your entire earnings at retirement.
Thus to
keep your standard of living you would need a 100% replacement ratio.

Lowering your saved earnings would delay retirement all
thing equal. As often the case things do not need to be equal. You could modify your Saving Rate
after applying the below strategy to give more or less the same initial saved
earnings or retirement date. In the simple strategy below, I did not adjust and thus get a higher retirement date. In the second strategy below, I did adjust.

From an administrative issue/market volatility issue,
you may want instead to use your expected withdrawal rate (3%, 4% or 5%) instead
of experienced interest. This way, a bad return year or a great year will not
mess up your saving strategy. Personally, I like to go with 5% withdrawal as it provide no risk of ruin and decent inflation increase using the Accumulation-Dynamic Decumulation method.

**Simplest way**

The first formula that come to mind is to remove the
interest from what you need to save as earning.
If you have a lower than 50% saving rate, this strategy fails as you
would not need any saving quickly. At 15% saving rate, this force you to stop
saving at half your career.

Ex: if you made 20,000$ of interest this year, only recognize 10,000$ of it. The weight to use is hard to determine. At 15% Saving Rate, using a 30% weight of Interest seems appropriate as it delays retirement by 4 years and small save earnings near retirement. At 30%, you get a 4 years delays at 50% weight of interest. At 50%, you get a 4 years delays at 90% weight of interest.

Below is a table summary of the extra available spending with/without the strategy

^{1}at 25% the way to retirement, 50% and 75%. It use the 4 years delays with vs without the strategy and weight discuss above and using a family salary of 100,000$.

**More complex way**

The first strategy have issues. Most of the decline in saved earnings is near the end. It leave a difficult
parameter to set up (weight of interest). Also it still have relatively large
saving near retirement or no saving for a number of years prior retirement
depending on the weight. To fix this, let’s look at the following formula:

Think of it this way, in the scenario where Saving
Rate = 50% = (Save Earnings + Interest)/ (Earnings + Interest). When you
start saving, you would need to have Save Earnings = 50% of Earnings. When you
are at retirement, than you would need Interest = 50% of Earnings. Using this nice equilibrium, we can adjust any other saving rate by applying a similar accrual pattern.

This strategy ends up at retirement
with almost no contribution and enjoy Spending increase 5% more than your boss
give you (which decrease as you age to a spending increase of +1%).

To get similar retirement age however, we need to be more
aggressive in saving in our early years than the previous strategy. Below is a
summary result of comparable saving rate incl./excl. Interest and the Extra
Spending along the way where Retirement age is the same for both Scenarios.

Conclusion:

Where ever you are in this journey you could think of
implementing the above strategy or part of it. Otherwise, you could also adjust
the strategy to say that you are going to have 10 years of higher saving and
then drop back to follow these strategies. Many different path exist for the DIY.

While there is a great focus in increasing saving, we need
to be conscious of why we are saving. Saving for saving sake makes no sense.
Dying with millions in our bank with no plan is not a wise approach to life.

If we were immortal, than this sort of approach makes even
more sense. It would be foolish to have to save for the rest of eternity for
saving sake.

**Note:**

^{1}: Both scenario using a goal of 100% replacement ratio and the same Saving Rate. If you have a lower goal, you could adjust the formula. If you wanted the same retirement date, increase your saving rate after applying the strategy to get it. Based on Fund = 0$ starting saving at age 20. For example say retirement age =65, 25% of the way is (65-20)*25%=11 years after saving start (age 31).

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