Both electrons and 3DCRT can be used for boost planning to the tumor bed in post-lumpectomy patients. Though there was slightly increased acute skin toxicity with 3DCRT photon which led to interruption of therapy, overall cosmesis at 2 years is similar in both modalities. 3DCRT boost is a better option than electrons dosimetrically, considering the fact that conformality; PTV coverage and OAR dosimetry were superior with photons. Thus in centers where electron beam therapy is not available, 3DCRT photon can be used effectively for tumor bed boost.