Business & farm

During the first 5 years, I was able to write off part of the loss because I was an active partner. For the years remaining I was passive and not able to write off any losses.

 

ok. mark 2020 as final and that sold or disposed of your entire interest. when it asks you for sales price use 0 but you'll need to know your remaining tax basis. any suspended passive losses are allowed on total disposition.  if you believe that you'll receive no further info or cash from the partnership, 2020 is the right year to write it off.  I must warn you that the IRS could challenge this unless you can prove your interest is totally worthless. 

 

plus all the 8% interest promised on the unpaid capital. For the entire 11 1/2 years.

this you don't get to write off. in effect since you never reported this as income you have $0 basis in it so there's nothing to write off.  besides, I don't think the 8% was really meant to be interest income but a preferred distribution 

 

 

 

is there anything that needs to be noted on form1065, or can I write off the remaining capital loss?

 

why are you referring to in regards to form 1065.  you state there was no 1065 since 2018. a partnership files form 1065 and issues k-1's to the partners.  you may not want to have anything to do with the partnership return.  the IRS penalty for failure to file each year is about $2400 ($200/mo for a maximum of 12 months)  per partner so for 3 tears that's about $7200 per partner.