This question already has an answer here:

Do I threaten to loose a domain if a new gTLD stops paying ICANN? I'm no expert but similar to how we have paid yearly renewal, the people providing gTLDs must also pay renewal fees.

marked as duplicate by Community Feb 6 '16 at 4:57

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    We've go two related questions here and here, but if you're asking what happens if the Registry or Registrar fails to pay the ICANN fees for each domain, I suppose that would be somewhat different. If not, and what you're asking is the same as one of those questions, let me know. – dan Feb 6 '16 at 1:48
  • The owners of gTLDs have to make such a large investment in hardware and network infrastructure that renewing the gTLD is small potatoes. As well, the money a gTLD can make in just one day is staggering. – closetnoc Feb 6 '16 at 2:08
  • @dan I think the second is a duplicate although the answer isn't great, but it does seem to answer my main question partially. I have marked it as duplicate. – William Feb 6 '16 at 4:43
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    @LiamWilliam Thanks for marking it, that's the first time I've seen someone do that on their own post (voluntarily) :-) – dan Feb 6 '16 at 5:03