While it's true that salary is no indicator of disposable income, it's also true that austerity has some way to go yet. Expect the vote on benefit capping across the board to be largely unopposed today, food prices are set to rise as a result of the weather and wages will largely stay the same or drop in real terms. If you can't cut your expenditure on £50k a year you can expect some pain and lessons in the difference between 'need' and 'want' as well as avoiding over-borrowing.
On the fairness front, tax systems haven't really kept pace with reality - a household is not really an entity to the taxman so, while it would be fairer to cap at household level, there appears to be no way of achieving this.
This recent recession has been different to others inasmuch as previously governments largely inflated their way out i.e. increased interest rates, increased spending on public sector and let wages rise. That gives the illusion of growth as consumers see their debt eroded and, as a result, spend more freely. This time we're seeing growth closer to how it really is - an unsustainable dribble.
Your political preference is irrelevant too as it matters not who is in power, successive governments have kept the electorate happy by borrowing from the future to provide a life-style we felt we deserved rather than had earned. Eventually someone has to pay the borrowings back. For the past few years it has been dumped in the laps of the young in the forms of university fees and unemployment and savers and pensioners in the form of low savings yields and poor returns on pensions. There's no point hitting the very rich as they can move their tax affairs somewhere more attractive and in any case, even if you took all their collective wealth away, it would be a drop in the ocean.
You can see at a glance where your money goes -
here - and the largest chunks go on social care, running Goverment and the NHS. How much per day it costs you personally you can see
here.
Not that it makes much difference if the outgoings exceed the income. That requires governments to borrow to fund the difference and there are limited borrowing options available, either from other nations or by printing money (QE). Both result in an interest bill - currently around £45b per annum.
It seems we're between a rock and a hard place, it's either going to hurt (austerity) or it's going to hurt a lot (bankruptcy like Greece)...