Having read through the pages and pages of responses on the other post, there are a few things that would help the reviewers and responders.
Are you saying after being in a relationship with someone for 2 years, viewing and putting and offering on an house. Getting mortgage agreements etc - you have not discussed repayments once? How have you both got into a position where you have a house being purchased and not discussed this?
What are your motivators for moving in together ?
Why are you feeling it’s unreasonable for her to pay less when she earns so much less?
surely if it’s a relationship and partnership it should be treated as one and not treated like a business deal.
the figures flying around are confusing. 30k, 100k - bonuses, stocks, dla etc.
why is a % of annual work income not satisfactory ? with a package of over 200k surely it’s a comfortable lifestyle?
Do you plan to marry your partner? Have children? Then what? Will you view things differently?
The other poster mentioned you currently both have your own homes. How different will monthly outgoings be on a joint home for you?
your partner is set to loose CB and Tax Credits as you are a high earner, already reducing her income. Why would you think it fair for her to give up the children’s disability benefits ? Are you giving up your child’s benefits ? Why is it fair for her to be worse off and you have large bonuses and shares/stocks sitting there ?
in short - what are you losing financially by making this move? Or is it more if a principle thing where you feel it should be 50/50.
Either way, lots of discussions should be had before moving forward.