Yes you pay tax on the job earnings for the whole year as normal. Then his Social Security and yours might also be partially taxable. You will each get a SSA-1099 from Social Security to enter into your tax return. Do you have any withholding taken out of the SS? If not you may want to increase his job withholding for the rest of the year to cover the tax or send in an extra estimated amount.
Up to 85% of Social Security becomes taxable when all your other income plus 1/2 your social security, reaches:
Married Filing Jointly: $32,000
Single or head of household: $25,000
Married Filing Separately: 0
