I sold a second home, however I lived it in full time as my primary residence for long periods of time. I know this is treated differently but don't know how to put it in

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To exclude gain under the rules in this publication, you generally must have owned and lived in the property as your main home for at least 2 years during the 5-year period ending on the date of sale.

First, you have to check to see whether the five-year (60 months)rule is met:Have you used the house for at least(24 months) two years out of the last five years ending on the date of sale. ? 

Either 24 full months or 730 days will satisfy the two-year ownership and use requirements. 

1) The property must be the principal residence of the taxpayer for two of the preceding five years. 

2) The two years may consist of either 24 consecutive months or 730 accumulated days during the five year period ending on the date of sale.

3) The ownership test simply requires that the taxpayer owned the property for at least 2 years during the five year period.

(4) The use test requires that the taxpayer live in the home as his/her primary residence for at least 2 years during the five year period.

(5) The exemption is not available if the taxpayer excluded gain from the sale of another home under Section 121 within the 2-year period ending on the date of second sale. In other words, you can only claim the exclusion once every two years.