Cross-linguistically, morphological wh-agreement has been observed either on C/T or on verbs (Zaenen 1983; Reintges et al. 2006), coinciding with classic domains for successive-cyclic A' movement. This suggests that other phasal XPs may be also marked with morphological wh-agreement. The central claim of this paper is that in Indonesian, wh-agreement occurs in three domains: complementizers, verbs and nominals. Evidence for wh-agreement on C and wh-agreement on verbs comes from previously observed patterns in the literature, which I re-cast as wh-agreement. Next, by examining cases in which possessors undergo A' movement out of DP, I show that obligatory changes in morphology are an instantiation of wh-agreement within DP. This analysis contributes new patterns to the range of attested wh-agreement, and brings Indonesian morphosyntactic patterns under the umbrella of a wider cross-linguistic phenomenon.