Johny these are some good questions,
The cost
This depends greatly on several factors however is usually a reflection of the costs incurred by the Fund in hedging their currency positions, and can range from 0% to in excess of 1% pa. Note that different currencies will often require different strategies and costs to hedge.
How does it work?
'Hedging' removes currency risk from the equation, and maintains the relative purchasing power of your dollar.
To illustrate this, lets say that you invest $1,000 into a US domiciled investment Fund. The exchange rate at your date of investment is $US0.80 for every Australian dollar....therefore your investment buys you $US800 worth of the Fund. Up to this point, the $US800 is exactly the same value as $AU1,000.
Over the next 12 months the Fund returns 10% on your initial investment of $US800 - or $US80.
Now currency comes back into the equation. If the Aussie dollar has strengthened to $US0.95 the conversion of $US80 will provide you with approx $84.21 in the hand ($US80 / $US0.90 = $84.21). If the Aussie dollar has fallen to $US0.60 then you will walk away with $133.33 ($US80 / $US0.60 = $133.33). Your return on investment in these scenarios is between 8.42% ($84.21 / $1,000 ) and 13.33% ($133.33 / $1,000).
If on the other hand you 'hedged' your position the currency risk would be removed, and your $US80 would be converted to $100 Aussie dollars worth (10% return on investment).
This is a pretty basis example & does not take into account each investment manager's approach to currency and interest rate management.
Limitations
There are some limitations on the availability of hedging strategies in developing/emerging markets were there are concerns of illiquidity or too much government involvement in their currency markets.
Suitability of 10+ year timeframe
Johny, unless you have any strong feelings on which way the Aussie dollar is going, hedging your international portfolio is certainly an idea worth thinking about (being careful not to provide advice here...). Have a think about where you think Australia as a country and economy is going....how do you think we are perceived by the US, China, Eurozone etc?? This has a direct bearing on our foreign exchange rates
When is an Unhedged Aussie Dollar an Advantage?
As illustrated in the example above, and unhedged Aussie dollar is going to be beneficial for your investment portfolio if the Aussie dollar falls as your offshore investment earnings, when converted to a weak Aussie dollar, will be appear inflated. From a macro and trade perspective, this also benefits exporters (as a $US1m export shipment @ $US0.50 will yield $2m) and disadvantages importers (they now have to pay $2m for $US1m of goods).
As a final note, it may be worth your while considering alternatives to purchasing directly through Comparefunds (or similar sites). Dependent on your circumstances there may be more appropriate options that provide greater flexibility and diversification and enable you to better track your portfolios.
Your financial adviser should be able to provide some guidance on this matter.
I hope this has been of some assistance
Regards,
Global1