Carrentals.com doesn’t really do promo codes—it’s just an Expedia white-label aggregator. Use it to benchmark rates, but always choose the "Pay Later" filter so you aren't stuck with cancellation fees. Even better, run your reservation number through AutoSlash afterwards. When the rate drops closer to pickup, just cancel and rebook.

Always check if you booked Pay Later or Pay Now. If it’s Pay Later, just hit cancel in your itinerary tab. It’s free right up to pick-up. But if you prepaid to save a few bucks, you’re stuck with supplier rules, and they usually slap on cancellation fees inside 48 hours.

Just a heads up with CarRentals.com: the promo code box usually only shows up if you select the 'Pay Now' rate. If you choose pay at the counter, the box literally disappears. Most sitewide codes are duds, so I just run Honey or compare the final total against AutoSlash before locking it in.

CarRentals.com doesn't do referral bonuses at all. If you’re trying to help a friend save, honestly skip their site. Just have them plug the trip into AutoSlash to track rate drops, or check Costco Travel. If you want kickbacks, send them a Rakuten link and book direct through Budget instead.