As a married couple for it to be treated as anything other than 50/50 it needs to be owned unequally AND you need to both notify HMRC of this.
Yes, but a Ltd Company is established as a type of partnership and one of the exceptions to the 50/50 rule:
“If there is a partnership, the letting will be part of a separate rental business and it will not be pooled with profits or losses from properties held by the partners individually.”
“Husbands and wives or civil partners living together should generally be treated as entitled in equal shares to income from jointly held property. See: ICTA88/S282A for years up to 2006-07, and
ITA07/S836 for 2007-08 onwards. However, this rule will not apply in any of the following instances:...
there is actually a partnership; ICTA88/S282A (4)(b), ITA07/S836 Exception C. In this case the income is divided according to the terms of the partnership agreement,
The partnership agreement would be one of the business documents filed with the companies house when the Ltd Company is established.
Any income is given in dividends and goes by shares owned by shareholders. And if the husband owns 100% of the shares because it is all his money starting the company, then he gets 100% the dividends. He could also draw a salary to claim as earned income as well.
Yes, I agree that getting a mortgage might be tricky, but with 50% or more as a deposit and a good market rent analysis showing the returns, a good broker can find you one. It would be worth the slightly higher interest imho because of how much you can deduct from taxable business income.