Our T5 slips are in both of our names. TurboTax is asking to either enter a new T5 slip for me or a new T5 slip for my wife. What do I do as our accounts are joint owned

If you and your spouse are preparing your returns together, you can enter in the t5 on your spouse's return, and then enter the percentage that is to be claimed on your return at the bottom. The amount will automatically be split between you based on the percentage you have entered.

If you and your spouse are preparing your returns separately, you would enter the slip on both of your returns, entering the percentage on the bottom of the slips on both.