If I did not meet the requirements for rebates in the first month of the quarter for the UOB One card, will my second and third months be affected?

Miss one month of the quarter means the entire quarter won't enjoy the higher rebates.

There's one exception from my check with UOB CSO:

The first month when you get the card, as it won't start exactly with your accounting period since they count per quater basis, thus for the first month, you min amount spending will be pro-rated instead of having to meet at least $500 to qualify for the rebate. Once you're into your usualy quarters, it follows the same pricinple where it each month of the quarter has to meet the min spending, otherwise the whole quarter higher rebates will be gone.

That's one of the concern that have stop me from switching to this card for quite long.

Cheers

No, you will not receive any rebate at all. This is because UOB One works on meeting the required spending every month for a consecutive billing quarter. Since you miss one month, it is as good as missing all three months in the billing quarter.

As an alternative, I will suggest you to transfer your expenses to another card in order to receive some cashback for the other two months.

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