In the growth option of arbitrage funds, over a holding period of more than one year, the returns are taxable as long-term capital gains at 10 per cent plus surcharge and cess. For a holding period of less than one year, the returns from the growth option of the fund are taxable as short-term capital gains, at 15 per cent plus surcharge and cess. In debt funds, returns are taxable at your marginal slab rate, both in the growth and income distribution-cum-capital withdrawal or IDCW (dividend) option. For most investors, the marginal slab rate would be 30 per cent plus surcharge and cess. Hence, over a one-year holding period, you get a significant tax advantage in arbitrage funds, over both a short-term holding period and IDCW (dividend) option. If not one year, then the horizon should be, say, at least six months, to take care of the volatility mentioned earlier.