Can stock vouchers in Tiger Brokers be stacked?

The stock vouchers can’t be stacked together to be used in 1 trade!

Hmmmm I normally buy more than the amount of my stock voucher to make full use of it! :)

As long as your voucher is “in use”, it will be automatically rebated, you can check through the “order” -> “filled” -> the status should be “rebating” & then wait a day for the amount to be rebated (status will be changed to “rebated”

No, you can't stack them in a single trade

Not sure tbh, but I just go slightly over (10 shares of ES3 is about $32) just to be safe.

Yes. Check under your transactions, under your filled order, you should see the word 'Rebating'. Make sure you see that before using the next voucher to make sure that your vouchers are being used.