What are advantage and disadvantage of including main home sale loss in 2020 return? I have 2021 gain in second home sale and can I use the 2020 loss in some way?

[prballin]

I entered the data and got the info personal loss does not affect my return, but has a box if I want to include the sale in my return or not. Why should I check this box? If do, can I use this loss towards my second home sale gain in 2021?

[M-MTax]

If you want to report it that's fine but you can't deduct a loss on personal use property even if you have gain on other personal use property.

[ToddL99]

As @M-MTax stated, "if you want to report it that's fine but you can't deduct a loss on personal use property even if you have gain on other personal use property".