Generally, filing married filing separate is the least beneficial filing status. Filing joint is the most advantageous filing status.
If the total of your income plus one half of his social security income is less than 32,000 dollars, your husband's social security income will not be taxable. However, if you file separate, he would need to file and more of his social security income will be taxable because the base amount is zero (not 32,000 dollars that is available for married filing joint returns).
