Once I am granted Indefinite Leave to Remain through my Application under the UK’s Tier 1 (Investor) Category, when can I apply for citizenship?

You would normally be able to apply for citizenship one year after you are granted indefinite leave to remain. I would need to know more about your circumstances to give you a definitive answer on when you qualify.

You would normally need to wait exactly one year after the grant of ILR before you can apply for British Citizenship. The Citizenship/British Passport Application would then usually take another six months to be processed. The criteria for citizenship would need to be satisfied, which is why the above is only general advice. You would also need to satisfy the following requirements: (1) you must have been a resident of the UK for at least five years (or three years, if you are married to a UK citizen), (2) you must have held indefinite leave to remain (ILR) for 12 months (or for one day if you are married to a UK citizen), (3) you must have not remained outside of the UK for more than 90 days in the12 months before applying and (4) you must have not remained outside the UK for more than 540 days in the five years before applying. Discretion on the absences is allowed in certain circumstances.

You will need to wait at least 12 months after you get ILR before being eligible to apply for naturalization. If you are married to a British citizen, then the requirements will differ. You will additionally need to make sure you meet the residency and good character requirements.

After being granted ILR, British nationality can be applied for after one year.

Generally, you need to have been free of immigration control (i.e. have ILR) for 12 months before you can apply for citizenship. There are, however, a number of other eligibility requirements as well.