State law (Uniform Partnership Act) governs if you had no partnership agreement. Whoever signed the SBA loan is liable to the SBA. The individuals who signed a personal guarantee (if applicable) are liable. For example: If both of you signed a personal guarantee, then each of you are probably liable for the entire amount. In summary, it appears that you are liable to the SBA for one half. You may have a claim against your partner for unjust enrichment (i.e. you donating 80% versus her 20%).
Answered on Oct 10th, 2012 at 1:00 PM