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By filling extension as MFS it only means that your extension is for you only, not for your husband. If you filed single it would not make any difference, the filing status on extension is not a filing status you must use on your tax return.
If you file jointly you will have to include all his and all your income, including social security benefits. Unless you lived apart for more than 6 month in 2015 AND have a child as qualifying dependent, your only options are filing jointly or separately.