If you have a valid excuse for not complying with all the requirements for the exclusion, you'll get a partial exclusion—not the whole $250,000/$500,000. The amount is ordinarily limited to the percentage of the two years that you fulfilled the requirements. For example, if you own and occupy a home for one year (50% of two years) and have not excluded gain on another home in that time, you may exclude 50% of the regular maximum amount—up to $125,000 of gain for a single taxpayer and $250,000 for married couples.
