Can you make 403b contributions after December 31st count towards previous year tax return?

[SweetieJean]

No. The 2017 403(b) contributions must be made by Dec 31, 2017.

[PaulaM]

No, 403(b) contributions function similarly like a 401(k) and are made during the tax year. IRA and Roth contributions can be made for the prior year up to the due date of the tax return.

[pootklopp]

So there is no way to decrease tax liability after Dec 31st if I am not eligible for IRA contribution deductions? : (

[PaulaM]

The only other consideration would be an HSA funded for the prior year up to due date of return.