Assume you have P100,000 and you're thinking of investing in Mutual Fund A whose current (ie., Year 0) NAVPS is P1.00.
Assuming there are no sales loads and no other fees involved, you will be getting 100,000 shares of Mutual Fund A:
P100,000 total investment amount / P1.00 NAVPS = 100,000 shares
You know NAVPS fluctuates daily depending on a number of factors, but assume that at the end of Year 1, Mutual Fund A's NAVPS increased to P2.00. Your "income" after 1 year, then, is:
P2.00 Year 1 NAVPS
1.00 Less: Year 0 NAVPS
P1.00 Increase in NAVPS
In effect, after 1 year you "earned" P1.00 per share of Mutual Fund A
100,000 Total Shares Held
P1.00 Increase in NAVPS
P100,000 Total Income after Year 1
Because you have 100,000 shares of Mutual Fund A, you "earned" a total of P100,000 (100,000 shares x P1 income per share) after Year 1.
Of course, you still have that initial investment of P100,000 so the TOTAL FUND VALUE of your investment is now P200,000.
Note that the FUND VALUE is the one that increased and not the NUMBER OF SHARES held.
Here I referred to income as "income" and earned as "earned" because this "profit" is actually just a PAPER PROFIT. This means the gain has not been REALIZED yet. The only way to realize a gain from mutual funds is to redeem the shares.
Let's extend the example to Year 2. Assume that at the end of Year 2, the NAVPS of Mutual Fund A fell to P0.50. Let's review first:
1. How many shares again of Mutual Fund A do you have? 100,000 shares.
2. At what price did you buy these shares? P1.00 per share
3. How much is the total value of these shares at the end of Year 1? P200,000.
4. How much was the NAVPS of those shares at the end of Year 1? P2.00 per share.
5. At the end of Year 2, what are the only things you should be concerned about? #1 and #2.
At the end of Year 2, the total investment value (#3) and the NAVPS of Year 1 (#4) DON'T MATTER anymore. Don't forget that.
Here's how to compute the gain (or loss) for Year 2:
P0.50 Year 2 NAVPS
P1.00 Year 0 NAVPS (NAVPS when you bought the shares)
P0.50 Decrease (Loss) in NAVPS
Simply speaking, the shares which you initially bought at P1.00 per share are now valued at just P0.50. In effect, you "lost" P0.50 per share.
What's the total "loss"?
100,000 Total Shares Held
P0.50 Loss per Share
P50,000 Total Loss
Because this is a "loss", this should not be added but rather, deducted from your P100,000 initial investment. Thus, the TOTAL FUND VALUE of your investment is now just P50,000.
Fortunately, this is another PAPER LOSS because it is not an ACTUAL LOSS. You will only incur this loss if you decide to redeem the shares.