It's widely known we're a net contributor to the EU, it's not disputed at all. Money doesn't magically appear in the EU coffers, as the UK is one of the strongest economies in the EU, of course it's a net contributor.

The exact figure is disputed, leave were saying £450 million per week, remain were saying it's £150million per week.

https://fullfact.org/europe/our-eu-membership-fee-55-million...