Te lo digo luego.

[cityotter]

English Translation

I’ll tell you later.

Hello! I’m wondering, could you also say, “te lo dire luego?” Because it’s future tense.

[keiths22]

This is how it would be said in Argentina and neighboring areas where the future tense is generally avoided, but your way is more proper.

[Adrianxu]

yes, “te lo diré luego” is correct too.