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How will a 1099 work with an existing W-2?
You can have multiple W2 forms on the same tax return. If you are using software, it will have the ability for you to enter additional W2 forms. If you are doing it by paper, just follow the instructions and combine the numbers at the correct place and attach both.  Similarly you can also have a 1099 with and without a W2. Just remember that with a 1099 you will have to pay the self employment tax ( FICA taxes, both employee and employer) and that no taxes will be withheld. You will want to either adjust the withholding on your main job or file quartely estimated taxes. Travel reimbursement should be the same tax exempt wise. The difference is that with a 1098, you will need to list your business expenses for deduction on the corresponding tax schedule. The value on the 1099 will include travel reimbursement. But then you can deduct your self employment expenses. I believe schedule C is where this occurs.