Yes. 

Money transferred to your HSA through MaxHSA counts toward the annual IRS HSA contribution limit. 

If you are already contributing to your HSA through payroll deductions or personal contributions, you should monitor your total contributions to avoid exceeding the annual limit. If you are approaching your annual limit late in the calendar year, you can pause MaxHSA transfers to your HSA. You will continue to generate Roundups and Cashback Rewards. These funds will remain in your Max HSA until they can be deposited into your HSA the following calendar year. This way, they will apply to the new year’s contribution limit.

See the Terms and Conditions for more information.