Yes. You can make contributions to a SEP IRA and make regular, annual contributions to a Traditional or Roth IRA. If you participate in a SEP IRA, you are considered an active participant in an employer-sponsored retirement plan. Typically, your Traditional IRA contributions are tax-deductible, but this can change based on the SEP IRA contributions you are making, your income, or other factors. Contact your tax advisor and read more on the IRS website.
Betterment is not a tax advisor, nor should any information herein be considered tax advice. Please consult a qualified tax professional.