Yes, you are good.
Basically, with the cash savings, they don't count the first £16,000 and then you need 2.5 years worth of £18,600. But for income you just need to show £18,600 per year.
What they do is work out how much 'per year' your savings are worth in terms of income and then you can use actual income to make it up.
If you have no income then for savings you need to show you have 2.5 years x £18,600 plus the initial £16,000... which comes to £62,500.
However, if you have an income of say, £15,000, then you need to make up the difference with savings in the following way:
£18,600-£15,000 = £3,600 to make up.
So in savings you would need:
(2.5 years x £3,600) + £16,000
= £9,000 + £16,000
= £25,000 in savings.
Now, in your case you have $70,000 in savings and you need to know how much per year that is worth towards the £18,600 requirement... so you work backwards.
Currently $70,000 is £56,463 with the exchange rate.
Take off the £16,000 and you have £40,463.
Divide that by 2.5 years and you get £16,185.20 per year.
So through cash savings you can show £16,185.20 per year towards the annual income requirement of £18,600.
Now you just have to make up the difference with your rental income:
£18,600 - £16,185.20 = £2,414.80 per year in rental income, or £201 per month.
You make about £500 per month in rental income so you have more than enough.
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