Actually this approach is very very simplistic.
Even if 100% Pakistanis pay all their income to the taxes,
We still will need these loans.
you know why?
We can select civilian, army, sarkari baboo, IK, NS, PPP, we'll still need these loans.
you know why?
The loans come in hard currency aka dollars.
Our taxes are collected in soft currency aka rupees.
You ever wonder if your parents gave you 50 rupees and then immediately took 10 rupees back? in the name of taxes?
Would that help your family budget if you paid back 10 rupees?
My dear friend the global economy of today is way more complicated than electing IK/NS/AZ or paying rupee taxes.
Why
Because the governments of today run on dollars.
Either you print them (only possible for USA)
or you get them from tourism, loans, aids, exports, expats.
So please let's think out of the box.