Hi Quidgy, welcome to the forums!
First of all, don't underestimate the effect of fees on your investments. I was in the same boat as you 10 years ago - I had read a ton of forum postings about where to invest my money. At the time, my choices were to invest in the only ETF listed on the ASX (ticker: STW) with 0.286% p.a fees. It tracks the ASX200 index. My other option was to put my money into a Vanguard LifeStrategy High Growth Fund with 0.90% p.a in fees. After sleeping on it for a few days, I decided to go with the Vanguard High Growth Fund because it was more diversified (it had international exposure in addition to the exposure to the ASX300)... but then after a few years of investment experience, I decided to read a few good books by the Vanguard founder, Jack Bogle (this is sort of ironic). He posits that there are two major drivers for investment performance - Asset allocation and fees. He illustrated how even a small difference like 0.5% in fees could have a massive impact on the fees you pay during your investment lifetime. To illustrate, take an example of $10k invested in a low cost ETF compared to the Vanguard LifeStrategy High Growth Fund using a calculator provided by MoneySmart:
https://www.moneysmart.gov.au/tools-and-resources/calculators-and-apps/managed-funds-fee-calculatorInvestment Amount: $50000
Investment Earnings: 8% p.a
Low Cost ETFs offered by Vangard (eg, VAS, VTS, VEU) fees p.a: 0.15%
Vanguard LifeStrategy High Growth Fund fees p.a: 0.9%
Investment Time Horizon: 30 years
Over an investment time horizon of 30 years, you've paid $118,426 in fees for the Vanguard LifeStrategy High Growth Fund, with an ending balance of $380,706. If you had invested in one or more low cost Vanguard ETFs, you would have paid about $22,002 in fees, with an ending balance of $481,131. Such is the grand power of low fees and the insidious effect of high fees over long investment horizons!
The other thing I would mention is the the optimal investment amount that you've worked out ($1600 per trade). This seems kind of low to me (typically I invest in $5-10k increments), but I won't pretend to have any idea how that stackexchange link works it out. Keeping this in mind, there are a few suggestions:
- Lowering your brokerage cost with a cheaper broker will help you minimise investment costs. The cheapest one that I can find is CMC markets, at $11 per trade
- There is an associated opportunity cost for not being invested in the market (ie, you miss out on the gains), but you can save the money in a high interest savings account until you have your magic investment amount. I currently do this with an ING savings maximiser account, which offers a 4% p.a interest rate.
- There are generally high buy/sell spreads for ETFs with low volumes (the difference between the price you can buy a stock for and the price you can sell an stock for). This is worth factoring in if you choose to investing in ETFs that aren't very popular.