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^^^ You can SORN it online right upto (almost) midnight on the last day of the month, and receive refund for the next and subsequent months, so no reason to do it before then, any change of ownership submitted to DVLA automatically ends the previous keeper's tax and transfers liability to the new keeper (and de-SORNs, which the new keeper must see to)), though if that happens on/after the 1st of next month both keepers will pay tax for that month. |
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