Although, on the flip side - I don't remember where you live - but in the US, you have to claim as income the value of the cryptocurrency at the time you receive it. If the value goes down, not transferring it to your wallet now will work in your favor. However, if the value of NRVE goes up significantly before you redeem it, you'd have to claim a higher amount of income based on the fiat value at the time of redemption.
@Christina Gleason, I'm not sure this would be the correct application of the law. The "time you receive it" would be when it arrives in your Rewards account on the Narrative platform. As I understand it, redeeming your rewards is simply moving it to your off-site wallet, which is like moving money from one bank account to another.
In that case, when you convert your NRVE to another currency--be it USD or another crypto--that's the moment you'd claim your capital gains. So if the value has risen, you'd pay capital gains tax (short-term or long-term depending on how long you've held it). If the value has gone down since receiving it in your Narrative account, then you'd report it as a loss at the point of conversion.
I'm no tax lawyer or CPA, so this isn't tax advice, but that's my understanding of U.S. crypo tax law.