RE: BUY OR SELL31 May 2025 12:53
Just to confuse things further...
Working out how much money you've made on shares after a few years and a few rounds of divided reinvestment becomes annoyingly complex.
As an example, based on my holdings in Aviva...
- 2.5 years ago I invested £10k in Aviva - so £10k is the Sum Invested
- today, after reinvestment of the dividends that investment stands at £15.7k - that's Today's Value
- the total amount I have paid for those Aviva shares - that is the £10k Sum Invested PLUS the reinvested dividends is £11.5k - that's the Book Value
(Go with the PRINCIPLE of these numbers as these are BASED on MY returns, which include multiple purchases and sales. The "£10k" is a made up number, but the scaling of the other numbers matches what's gone on.)
I can calculate my Total Return as either:
- 36% if I calculate it as Today's Value / Book Value; or
- 57% if I calculate it as Today's Value / Sum Invested
I could choose to calculate "yield" based on Today's Value OR Book Value OR Sum Invested, so it's:
- 5.9% based on Today's Value
- 7.9% based on Book Value
- 9.2% based on Sum Invested
Annoyingly (for me) most investment platforms and apps (including divtracker) state returns based on Book Value, which understates the return if I compare it to a fund. This is because funds "hide" all of the dividend reinvestment from the investment platform - so the Sum Invested and Book Value are the same at £10k and Today's Value of £15.7k.
These differences are really important in helping make investment decisions.
My investment platform tells me that my SMT investment is comfortably beating my Aviva investment, when my Aviva investment is actually just ahead on an annualised return basis.
Tracking this stuff is particularly relevant if you buy into something, the share price drops, you reinvest the dividends and then the share price recovers. This is because dividend reinvestment at a reduced share price gives a boost to your Total Return. For example, at one point my MNG investment was -5% against Book Value, but +12% against Sum Invested over a 15 month period (17% gap). It's now a more enjoyable +10% / +30% over a 24 month period (so a 20% gap). The difference between the 17% gap and 20% gap is because my dividends were buying more shares at a lower price when the share price had dropped.
If you have multiple purchases and sales then this stuff can get quite tricky to track.
The only site that I've found that allows you to track this stuff properly is Sharesight, which allows you to import data from most popular investment management sites. Unfortunately, if you've got more than 10 holdings then it costs £8 a month - which is something I'm not prepared to pay when I'm a dab hand at a spreadsheet.