Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

My friend wants to put my name down for a house he's buying. What risks would I be taking?
That "something" you are signing means you are liable for the mortgage payments - yes, all of them - if he can't or won't pay at any point.  The limit on what the bank will lend him based on his salary is there for a reason - they don't expect him to be able to keep up repayments if they lend him more (or more precisely, there's a big risk that he won't). Don't forget that even if he swears up and down to you that he can afford them, interest rates can rise; this is a 25 or 30 year commitment you would be making. Interest rates are at a historic low and the only way from here is up; in my living memory rates have been 12% or even 15%. As a very rough rule of thumb, for every £100k borrowed, every additional 1% on the interest rates costs an additional £100 on your monthly payment.  Also, the "Transitional Arrangement" is not without its own fees and the bank won't let him simply take you off the mortgage unless they are convinced he can keep up the repayments on his own, which they clearly aren't. Also thanks to @Kat for the additional good point that being on the hook for your friend's mortgage will prevent you from being able to get a mortgage yourself while the liability still exists, or at least severely limit your options. No matter how many times you protest "but I'm not paying any money for that!" - it won't help.  Another point: there are various schemes available to help first time buyers. By signing up for this, you would exclude yourself from any of those schemes in the future.