Thank you for your reply! I have also come around to the idea that there might not be a logical way to get around this.
Her current student visa runs out in January so I assume she would have to go back to the US and then wait until April and then file her tax to then file from out of the UK to come back again? Do you know if there is much of a difference in timelines between filing from within vs out of the US?
Unfortunately, that's not an option if she wants to use her income... because in order for her income to count, she must have a valid UK visa that allows work.
(Edited to add: however, larrabee has just pointed out that she is not allowed to be self-employed on a student visa, so her income cannot be used anyway)But as soon as she has left the UK and her visa has expired, she will no longer have a valid UK visa that allows work, so her income can no longer be used to meet the financial requirements.
A little more nefarious question I have is about the fact that apparently as long as one applies for this visa before the end of the current visa she is on, she can stay in the UK and keep working 20 hours (the student visa limit) until a decision is reached on her Non-spousal partner visa. Is that correct?
That's correct (in fact, she can work full-time if she has finished her studies), however, she won't qualify to apply for the visa before December, as you do not meet the financial requirement, so it would be an automatic visa refusal.
What would happen we submitted an application the day before her current student visa ended in which we combine the incomes (erroneously)? Im assuming there would be a phase of processing during which she would be able to stay; potentially until April rolls around at which point we could update the application with the up to date tax returns? Or is that not how the process works? Excuse my ignorance in advance on this stage of the process since we have been mainly focusing on getting our documents together at the moment.
I would definitely not risk that. The visa will be automatically refused and she will only be given 14 days to either reapply or leave the UK. Processing times for FLR(M) visas are about 8 weeks, so chances are the visa would be refused around February or March maybe March and she would only have 14 days to meet the requirements or leave the UK.
However, even once April has rolled around, she will still have to file her tax returns and get all the paperwork in order, so it could potentially take another couple of months after April before you will be ready to apply.
Also, once she has a visa refusal on her record, that makes any future application she makes non-straightforward, which can extend processing times and she should apply for a visitor visa before attempting to visit the UK in future.
Edited to add: And given that she cannot be self-employed on a student visa, if you did attempt to apply for it, she could be banned from the UK for up to 10 years for working illegally on her student visa.
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Basically your options are:
1) She finds a UK employer who is willing to sponsor her for a Tier 2 work visa, and she applies for it before her visa expires in December (meaning she can stay in the UK while it is processing).
2) She returns to the US in December and lives there until you have finished your studies and you have a job that pays £18,600 which meets all the requirements (i.e. you may have to work there for 6 months first if you have not earned £18,600 in the previous 12 months)... then once you can meet the financial requirement using only your income, she can apply for the visa to come back to the UK