You can change your PSN ID from early 2019, Sony has announced.
A beta of the feature will begin testing soon, Sony said. This is part of the PlayStation Preview Program, and is available to select users who’ve pre-registered as testers for previous PlayStation 4 system software betas.
While during the preview you can change your PSN ID as many times as you like, when the service launches proper it’ll work differently. Then, the first change is free. After that, each change costs £7.99, although you get a discount to £3.99 if you’re a Plus subscriber.