assuming the entire amount of the loans went to purchase equipment, you get no write-off for the loans. what you can write off is the remaining tax basis of the equipment, if any. have you been filing partnership returns?
here's an example that might clarify why the loans aren't a write off
you (invest) loan the LLC $50. which gives you $50 of tax basis.
the LLC buys $50 worth of equipment. this has no effect on your tax basis
you take $50 of depreciation on the equipment. this reduces your tax basis to $0. so no further write-off is available. if only $40 of depreciation was taken and the equipment is worthless, the remaining $10 could be written off. in either case, you put in $50 and took write-offs of $50
you have to determine your tax basis in the LLC. if it's greater than $0 then it has something that has a tax basis greater than $0. if it's worthless it can be written off and the loss passes through to you on the k-1 for the partnership return. if somehow there is a negative basis, you wrote off more than was allowed. see a tax pro.
if you have not been filing partnership returns, consult a tax pro. penalties for failure to file can be as much as $5,000 for each return not filed.
