Your long-term capital gains will not cause your ordinary income to be taxed at a higher rate. Ordinary income is calculated separately and taxed at ordinary income rates. More long-term capital gains may push your long-term capital gains into a higher tax bracket (0%, 15%, or 20%), but they will not affect your ordinary income tax bracket. However, if you had short-term capital gains, then it would increase your ordinary income and potentially push you into the next marginal ordinary income tax bracket.