Contradiction with 1 Kings 4:26
1 Chronicles 9:9 states something contradictory to the description of Solomon's provisions or administration described in this verse.
1 Kings 4:26: And Solomon had forty thousand stalls of horses for his chariots, and twelve thousand horsemen.
Contradiction with 2 Samuel 24:9
This verse gives a different account of the number of people, which can be seen as inconsistent with 1 Chronicles 9:9.
2 Samuel 24:9: And Joab gave up the sum of the number of the people unto the king: and there were in Israel eight hundred thousand valiant men that drew the sword; and the men of Judah [were] five hundred thousand men.