I think it would be quite risky to borrow in CHF and avail of high deposit interest rates in HUF. The difference in interest rate is not that great and the risk would not justify the potential reward.
However, the EUR/HUF value is pretty much controlled by the central bank of Hungary due to the agreed permissable trading band. It would intervene if the rate decreased or increased beyond this.
Maybe I'm being very stupid here, but if it does not make sense to use the carry trade to make a cash deposit from CHF to HUF due to risk, why does it make perfect sense to some people to use the same carry trade for a mortgage (to buy an investment property in HUF, that generates rental income in HUF, but then to finance the mortgage payments via a loan in CHF)?
Isn't it exactly the same currency risk, except perhaps even bigger because you have no liquidity or flexibility in the mortgage that you would have in a cash deposit if things went pear shaped? I mean if the interest rates are really not that different then why stack up even more risk on what is an already risky venture for a euro based investor?
If the HUF crashes and you have a HUF mortgage, at least your EUR debt liability goes down in line with your EUR income. Whereas in a worst case scenario for the carry trade, the CHF strengthens as a traditional safe haven (liabilites go up), the euro weakens (back up cash goes down), and the HUF catches flu (income & capital value go down).
I got burned (not very badly admittedly) during the last bear stock market, where my US-based stock exchange holdings lost value, but the dollar also went the same way down as the fed pumped liquidity into the system, meaning those holdings were worth even less in euros. I tend to invest mainly in Euro and liquid Sterling based assets because I don't like that sort of nasty surprise.
Or do they get their rental income in CHF?