I already have a Chase Sapphire Reserve. However, the sign-up deal of $900 cash back for $6K in spend looks interesting (as does the 1.5% cash back), but I have two questions before pulling the trigger and applying:

• Can I meet the $6,000 spend requirement by charging federal tax payments to the card (e.g., through officialpayments.com)?
• If I keep the Sapphire Reserve, is each point earned on the Ink card work 1.5 cents towards travel?

Thanks.