I am afraid I sometimes think the
Divorce Calculator does more harm than good.
It can be true that a woman can walk away with quite a high proportion of the proceeds of sale of the
marital home. But I don't think this is common these days - after all, there is a yardstick of equality. And 80% is a bit steep.
In your case your wife has moved in with another man which, though emotionally hurtful, is to your advantage in a perverse sort of way ; her needs for housing are, for the time being, adequately met. Usually when the wife gets 70 or 80 per cent, there is a reason ; she needs that sort of cash to re-house herself and the children. For the moment, your wife does not have that need.
Now there is little doubt that your wife is going to have some interest in the house after a longish marriage. Chances are 50/50 would not be too far off the mark and if you agree that anyway, there may be no need for a Court hearing ; you can just make an agreement and send it to the Court for approval, it's called a
Consent Order.
Now I don't like rushing anyone into divorce, but from a purely financial point of view, make hay while the sun shines.
You see, supposing the cohabitation breaks down. The marital home is in joint names. She will have to vacate lover boy's house. Guess where she will want to go.
The chances are then that she will be allowed back in and you, my friend, will have to leave. You won't lose all interest in the house but you may have to wait before being able to realise it.
So, from a purely financial point of view, my advice is that your best bet is to sell up, split the proceeds, but not 80/20 to her, that is plain ridiculous.
50/50 if you like.
Then get a consent order which will shut out the possibililty of her making a claim against any house you might buy with your share.
This is one of the reasons why I think the divorce calculator can be wildly out. Computers don't think in the way people do.
LMM