I have both a Roth and Traditional 401(k) account through my employer. Both accounts are invested in the same index fund and both get bi-weekly contributions. One account had a significantly larger total value at the beginning of the year and gets a slightly larger contribution each paycheck. I understand the account with a larger starting balance and larger contributions will have a larger return in absolute terms for the year, but shouldn't the % return be the same?
Is this a case of, perhaps, poorly entered transaction information on my part? Perhaps this is more of a conceptual question that I'm not understanding.