Ideally, you would want them to report it paid in full... ESPECIALLY with a settlement that is THAT high (86%!?! Theyre not doing you many favors here). You should be shooting WAY lower in the first place but if they agree to that much, you should demand that it reflect paid in full.
Im not exactly sure how it works with a totaled car... is it still considered a repo? If so, the repo on your credit is more what you should be worried about.
RE: the 1099... you can be forgiven of the tax on this "income" (as they call it) if you are insolvant. That means that if, at the time of settlement, your DEBTS outweigh your ASSETS, you are insolvant.
Lets say you are a home owner and your home is worth $500,000 and you are currently paying a $300,000 mortgage on it. (for this example, lets also say that this is your only debt and your only asset). That means that you have $200,000 of equity (an asset) and $300,000 in debt. YOu are insolvant and you can be forgiven of this tax by filing a
Form 982 (<- click that for a copy of this form).
Hope this helps!