You will receive a 5498 form if you had made annual or rollover contributions into your Betterment IRA. Direct transfers into your IRA will not be reported, per IRS requirements. The information on your 5498 form will also be reported to the IRS.
Your 5498 tax form can be found on your Tax Forms tab under Activity. Generally this form will be made available each May for the prior year, after the April 17 tax filing deadline.