I dare say

Point 206 in Modality, in the English Grammar Profile, is used to say that something is probably true. Looking at 4 spaces to the right of the expression on iWeb corpus we find the following collocates which point to the fact the expression is often used with more modality. Two of those are contractions of “will, won’t”. These with “shall” suggest I dare say often introduces future clauses.

1 ‘LL (VM ) 74

2 SHALL (VM ) 59
3 MR. (NNB ) 27
4 WO (VM ) 26
5 MAJORITY (NN1 ) 15