It depends, every high earning household will be different, just as most middle income households are. We have a gross of around £350k pa, if we just took everything out as normal that would result in a tax bill of around £145k pa. As it is we pay 40% of our gross income into our pensions, which reduces our tax bill. That means we have a net of around £9,200 pcm.
Our mortgage it £1,800 pcm as a base payment, but we overpay by the maximum so that rises to around £2,200 pcm, council tax £300, gas and electric £120, water £45, Broadband £42, mobile phones £26 x2, Netflix £14 that comes to £2,763. We have Prime but pay annually and Spotify included in mobile contracts, no Sky and get Disney+ for free though work. Petrol might be around £120 pcm, car insurance and tax is paid in the month it is due. Food is £600-900 a month and varies from month to month. Depending on the month we will then put £3-4,000 into savings and the rest is spending money, days out, holidays etc.
From our lifestyle you would not know we are high earners though, we have both hit our stride career wise over the last five years and our incomes rose dramatically, but have kept our expenditure very similar, we now just put a lot into savings, pensions and overpay our mortgage.