How do I circumvent entering lines from my common-law's return. He always files late and I usually don't have to....

Last year I was able to enter his SIN and DOB and not enter an actual amount.

Self-employed

You can put in an estimate for now and then enter the correct amount before you file.

 

Self-employed

...but there is no way to avoid entering the value?

Self-employed

No. You are required to put your spouse's income on your return, and your spouse must put your income on his return.