Does my employee contributions end?

[MarilynG1]

If you are referring to Employee Contributions to a Retirement Plan or an HSA,  your contributions end when you leave that employer (or request that they end). 

If you made Employee Contributions all year, you can use 12/31/2019 as an ending date. 

If you can provide more info for your question, we will try to help you. 

[Gotemba]

I was referring to when would the amount I was putting on my tax return be over.

Joe Mabry

[ColeenD3]

The question is still not clear. What income are you reporting and from what form? Is there a reason you expect the income to cease to be reported?

Is it a 1099-R? As long as you receive the form, you will need to enter it on your tax return. The same goes for SSA-1099, if you have other income. If you don't, it is not taxable, unless you are Married Filing Separately and lived with your spouse during the year.