If no taxes were deducted from his paycheck, then he is a 1099 status...that is, he was considered a contractor. Contractors are supposed to pay "estimated" federal and state taxes every quarter as long as he was collecting a paycheck from this company. I got my accountant to figure out my estimated taxes and he printed out a bunch of payment stubs for me to pay off every 4 months....April 15th, June 15th, September 15th, January15th. If your husband is back to a regular W2 job, he won't have to make additional Estimated Tax payments anymore...just up until the quarter that he was being paid for. So if his 6 weeks pay crossed any of the quarters, he'd have to pay estimated tax for both quarters. It's better to over-estimate and then get some money back at the end of the year than to under-estimate because then you'll have to pay penalty and interest on the amount you underpaid.