Lss
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If keep the money as cash is there any difference in ibkr interest rate for USD Vs SGD?yep, but the point I was making is the auto convert isn't "free" at all you just don't see it in a commission line,
so the "guru" youtube video quoted here is actually misleading.
ibkr applies a 0,.03% spread automatically . so assume constant exchange rate, here's the actually cost:
Scenario A Lump-sum convert 25K SGD first
Convert once, then DCA in USD.
USD 2 commission
≈ 2.7 SGD
Scenario B Leave SGD, auto-convert each DCA (0.03% spread)
Each month IBKR auto-converts 2,500 SGD at 0.03% worse rate.
FX cost per DCA
2,500 × 0.03% = 0.75 SGD
Total over 10 DCAs
0.75 × 10= 7.50 SGD