Why the signature outlives the company
Landlords, equipment lessors, franchisors, small business lenders, and merchant advance funders routinely require an owner's signature before extending anything. Some owners remember signing. Many do not, because the language sat inside a credit application, a lease rider, or a renewal that was signed quickly during a busy season. Spouses are sometimes drawn in as co-signers on the same page, occasionally without a separate conversation about what it meant. When the company stops paying, the lender is not required to wait for the business case to finish before turning to whoever signed.
Read the document before deciding anything
Not every guaranty reaches as far as the lender's demand letter suggests. Some are capped at a stated amount, some cover only a specific obligation rather than everything now and later, and some require the creditor to exhaust the company's collateral first. Others are continuing and follow every renewal automatically. Whether property was pledged as security, and which state's courts handle enforcement, also change the practical picture. We would rather read the actual signature page than respond to a summary of it.
Sequencing the two problems
Filing for the company can accelerate the demand on the guarantor rather than quiet it, so a business bankruptcy with personal guarantee exposure is planned as one matter with two halves. Sometimes the guaranty is negotiated down while the company winds up. Sometimes the owner needs relief in their own name as well, and the order and timing of the two steps affect what is available. What we avoid is resolving one half and discovering afterward that it made the other half worse.