Does the law stipulate how the owners of new and old property companies pay fees alternately?

Since the old and new property companies are two different companies and legally recognized as two different legal subjects, the new property company has no right to ask you to pay the unpaid expenses of the old property company, because the expenses have nothing to do with the new property company, and the old company will claim compensation. As for the agreement between the old company and the new company, it has nothing to do with the owner and need not be considered.

As for whether it is reasonable for the new company to ask for payment by the end of the year, it mainly depends on the agreement in the property service contract signed between you. If the contract requires annual payment, it should be paid. If there is no such provision in the contract, even if you have not signed a contract with the new company, it is unreasonable for the new company to ask you to pay the property management fee for one year at a time.

Let me remind you that the property contract concluded between the old company and you cannot be directly applied to the new company.

As for the legal basis of your question, it is actually some basic principles of civil law and contract law.

If you are interested, you can look at the property management regulations:

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If you have any questions, you can send a message for further inquiry.