1 Accommodation: Am I right in thinking we only have to provide proof with letters, bills etc. for the last 2 years, not since she entered the country? We've lived at out current address since Feb 2018 so this would make things easier.
No, the 2 years of letters and bills is for your relationship evidence, not your accommodation evidence.
For accommodation evidence, you show where you currently live and will continue to live in the future, so you need:
If you rent:
- your original tenancy agreement (if both names are not on it, you also need a letter from the landlord giving your wife permission to live there too)
- your latest council tax bill
If you own:
- your Land Registry document
- your latest mortgage statement
- your latest council tax bill
Then, for your relationship evidence, you have to prove you have lived TOGETHER in the same house as each other for the last 2 years.
So you need to send:
- marriage certificate
- any divorce decrees
- 6 official items of mail in each name, from at least 3 different official sources, spread evenly over the last 2 years... so that's one document in each name, dated every 4 months. They can be joint documents, or individual documents, but you need each name on 6 of them (i..e 6 joint documents, 12 individual documents (1 each for each month you are using), or a combination of both)
For example, if you apply in April 2020, you will need a document in each name from each of the following months:
April 2018
August 2018
December 2018
April 2019
August 2019
December 2019
Optional extra (as it makes 7): April 2020
2 Income: We'll be using my income as self-employed to meet the requirement. The latest tax return I have is for 2018/2019, which I submitted myself without an accountant (I'm a sole trader). Is this ok to use? And if so, should bank statement cover that same period, to the period up to now?
You can only use the last FULL financial year, for which you have filed your taxes and have all your documents in order. You MUST use the financial year most recently ended.
Therefore, I believe you can ONLY use the 2018/2019 tax year, if you apply online in the next 3 days (before the end of April 5th). Which I would not advise doing because it sounds like you are only just getting started on preparing your application, and there are something like 14 different mandatory documents you need for self-employment, all of which must be in your hands and in order BEFORE you apply online (same goes for all the other required evidence).
If you apply from April 6th onwards, I believe you will have no choice but to use the 2019/2020 tax year, which means you cannot apply until AFTER you have filed your tax return for April 2020. However, I'm not sure if you will have enough time to do that before her visa expires, especially with everything going on at the moment (I'm also not sure if there will be any allowances because of the virus).
Does your wife work? If so, can you meet the requirements using her income instead? What about cash savings?
Self-employment is the trickiest category to use, with the most documents required, and so you really only want to use it as a last resort, if you have absolutely no other choice and no other way of meeting the financial requirements.