The two frequently used tag question forms in Spanish, ¿no? and ¿eh?, are considered linguistic variables since they are interchangeable in a discourse without causing any differences in the meaning. However, there has been a lack of analyses on these two forms from the variationist perspective, to my knowledge. The current study attempts to fill this gap by conducting a quantitative analysis on tag question usage in Madrid Spanish with corpus data within the framework of variationist sociolinguistics. The results demonstrated that the linguistic factors analyzed in the present study show similar patterns of usage with those of previous literature, in general: (i) most of the tags are used with declarative anchors, (ii) turn-medial tags are favored, and (iii) tag questions are more likely to be used in order to keep contact with the interlocutor or to get some responses from the interlocutor. On the other hand, the results of extralinguistic factors did not align with the patterns reported previously in the literature: (i) males use more tag questions than females, (ii) younger generations tend to use tag questions more frequently, and (iii) more tag questions are used by speakers with a middle level of education.