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Sally Hannon, chair of Thames Valley Police Authority, said the date change would be costly and she hoped Buckingham Palace would make some contribution.
"What we don't know yet are the additional costs of changing the date of the wedding and I'm sure that when the authority meets later this month it will ask for some support," she said.
"We probably will ask the palace for a contribution because, though we don't know the actual amount yet, it is likely to be large."
Meanwhile, Windsor Castle staff are investigating how two men entered one of its private areas, days before the wedding.
Scotland Yard said the tourists were detected immediately and taken back to the public area but not arrested.