I'm a volunteer driver and received a 1099-NEC

I've been a volunteer medical driver since 2017. I get reimbursed for mileage (IRS rate) + meals + hotels + tolls.

 

This year, unlike all years prior, I received a 1099-NEC.

 

It seems wrong to receive it because

1) they didn't send it years past,

2) other organizations I voluntarily drive for do not send any tax forms.

 

When I entered the 1099-NEC, my federal refund dropped from $166 to just $5.

 

My understanding is that I have to say I am self-employed and that I can only get my federal refund back up by entering expenses (vehicle/mileage/assets purchased/office supplies/etc.)


Problem is that I didn't know I needed to keep track of this info so I have very few records. 

 

Perhaps I should just guess on my expenses? I don't think the IRS is going to audit me as I am very low income.