Post-war, 3-7 years after the war. Harry gets an owl regarding his portion of the Weasley's Wizard Wheezes income. The money was deposited into an account that Fred setup. George completely forgot about the escrow portion of the account and without doing his part, the money was released to Harry. Due to weird tax law layering in a specific way, Harry has technically dodged taxes for seven years.
Cue a visit from Gringotts premier tax CPA, Fleur Delacour. Harry and Fleur haven't met after the death of Bill due to complications from the werewolf injuries. Fleur left England for France to better raise Victorie.
All I need to say is pencil skirt, white button down, and glasses