Not necessarily, if you've been late with your payments less than 3-times in the past year, and the payments were no more than 30-days late, you still have a good change at getting a competitive interest rate. Most lenders will accept certain reasons for this like an illness, or job-change, but explanations are required.
*All rates are subject to approval with 80% loan to value, 740 fico and Fannie Mae, Freddie Mac and FHA loan limits apply.