Depending on the terms of your contract (for example, if there is a grace period to make payments after the due date) you would be able to file a breach of contract action with the relevant Magisterial District Judge as soon as the first payment is missed. Good luck.
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I agree with Paul. File a lawsuit the first day you can. Show that you mean business.
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You can sue in small claims court as soon as there is a breach of the contract.
The information provided in this answer does not create an attorney-client relationship and is not considered to be legal advice.