Reduced Return due to Pension?

I retired in May from my school district. I did get paid for my district in June and July along with my pension starting. So I think that increased my income on my return but felt I had more deductions including paying for my health insurance. 

 

I started subbing and noticed on the election form for W-4, it asked if I had other income not from jobs. I did not put the pension in there because I did not know if that was monthly or yearly. It's less than $10K...would that have an impact? What should I put in there? I don't want to end up owing money this next year.

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Are there other things to consider since I retired related to taxes with my pension.

 

Thanks!

Debbie