What is the main difference between a sep ira and a Roth IRA?

A Sep IRA stands for Simplified Employee Pension IRA. Withdrawals from Sep IRA funds are taxed as if it was ordinary income. Taxes are paid at the beginning when a Roth IRA is opened. Withdrawals are not taxed so in the end a Roth IRA costs less than a Sep IRA. Both types of IRAs are great forms of investment.