@IDP

In TurboTax Online, if you are preparing your returns together, click on your spouse/partner's name at the top of the page. Then you can add their income information.

If you are preparing your return separately, click on 2024 tax Return at the top left of the page. Then click on Tax Profile, then Additional Information About Your Spouse. Click Continue until you get to the "Tell us more about SPOUSE" page. There you can enter your spouse/partner's income.