It depends on what you did in August 2015. If he was unmarried at the time and only used his $250,000 exclusion, or if he was married but still only used his $250,000 exclusion on his former home and did not use your joint $500,000 exclusion, then you can sell your current home any time and use your personal $250,000 exclusion on the home you have owned since before the marriage. (As a couple, you would then have to wait a full 2 years plus one day before using your joint $500,000 exclusion again.) However, if you want to exclude more than $250,000 of gains, or if you used your $250,000 exclusion in 2015, you need to wait the full 2 years from the last sale.