Yes, there is an income cap on vehicle rebate programs but you may have to check the exact limit in your specific region.
The following information is specific to the California guidelines and the exact values may not apply in other states.
Before February 24, 2022, there was a cap of $150,000 for singles, $204,000 for head-of-household, and $300,000 for joint filers. On and after that same date, the limits have lowered: $135,000 for single filers, $175,000 for head-of-household, and $200,000 for joint filers. If you and your wife both have a total annual income below $200,000 then you are still eligible to apply for the rebates.