Ok, I am glad I am not crazy (although this process is pushing me a whole lot closer to that)! Thank you for testing it. All above is affirmative. I am tempted just to say it is within the U.K. just to get it paid. I can't find any other way to pay it retroactively at this point.
As jfkimberly said, the problem is that you will be charged the wrong amount if you select that you are applying from within the U.K.
You are charged based on the length of your visa. The spousal visa is valid for 2 years and 9 months so you have to pay £600 for the IHS.
But the visa from inside the U.K. is FLR(M) which is valid 2 years and 6 months and so you only pay £500.
You need to be able to select the visa from outside the U.K. in order to pay the correct amount of £600. Several people on the past have been asked to pay it later and have had no issue doing it, so I don’t understand why it’s not letting you. Did Sheffield send you any instructions on how to do it?
Also, what I’m confused about is how you managed to submit the visa application online without paying it... because the payment is a mandatory part of the online application (as jfkimberly’s picture shows just above). You can’t actually submit the visa without paying it (in fact, some people who are exempt from paying the IHS are being forced to do so purely to complete the online application and then they have to request a refund later).
What visa type did you select when you applied online?
If it was Settlement -> Husband, that was the 33-month spousal visa and you would have had to pay the £600 IHS at that time.
If if was Settlement -> Marriage, you applied for a 6-month fiancé visa to get married in the UK... and you don’t pay the IHS fee because that visa does not allow NHS use.
If it was the latter, then UKVI must have realised the mistake and are allowing you to pay the IHS so they can issue a spousal visa instead of refusing the fiancé visa.
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