Interesting post from Enough Wealth on the "boiling point" when more of your gain in net worth comes from investment returns rather than saving. Rather than just look at the change in net worth, I created the following graph of monthly total saving from non-investment income:
This includes superannuation contributions and mortgage principal payments but not inheritances. I fitted a linear trend to this. Then I created a graph of investment income (including superannuation returns and changes in the value of our house):
I fitted a quadratic trend to this data. When the two curves cross we are at the boiling point. Because of the volatility of investment income it's a bit hard to see where that is. So, I also did this close up:
The boiling point was in January 2012 according to this analysis. Currently the trend is at about $35k per month, which is about four to five times the savings trend. That doesn't really say anything about the ability to retire. Some of the investment return is needed to maintain the real after inflation value of the portfolio and it needs to be compared to spending not saving!
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