There's lots and lots of 1099s and knowing what 1099 you're looking at would be extremely helpful.
A reverse stock split, in and of itself, is generally not a taxable event except for, possibly, the sale of a fractional share reported on a 1099-B as "Cash in Lieu" (CIL).
Not sure what you're referring to by "capital repayment" but if it's a Return of Capital reported on a 1099-DIV that's typically not a taxable event until cumulative returns of capital exceed your adjusted cost basis.
