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Can rent be added to your salary when applying for a mortgage?
The decision as to what counts as income is up to the bank. You'll need to ask them whether or not rental income can be included in the total. I can offer some anecdotal evidence: when I applied for a mortgage to buy my home, I already had a rental property with a buy-to-let mortgage on it. Initially the bank regarded that property as a liability, not an asset, because it was mortgaged! However, once I was able to show that there was a good history of receiving enough rent, they chose to ignore the property altogether -- i.e. it wasn't regarded as a liability, but it wasn't regarded as a source of income either. More generally, as AakashM says, residential mortgages are computed based on affordability, which is more than just a multiple of your salary. To answer your specific questions: Covered above; it's up to the bank. If you're married, and you don't have a written tenancy agreement, and you're not declaring the "rent" on your tax return, then it seems unlikely that this would be regarded as income at all. Conversely, if your partner is earning, why not put their name on the mortgage application too? Buy-to-let mortgages are treated differently. While it used to be the case that they were assessed on rental income only, nowadays lenders may ask for proof of the landlord's income from other sources. Note that a BTL cannot be used for a property you intend to live in, and a residential mortgage cannot be used for a property you intend to let to tenants -- at least, not without the bank's permission.