Just working mine out now Harry. I didn't pay any tax last year (part SAHM after redundancy from private sector job, part full time student) but I'll work out my household percentage as dh was working. As I said, we're definitely not poor but both socialists and live in London borough (so high costs - but that's our choice. Thank god we still have the luxury of having one!).
It was about 30.5% we paid in tax and NI last year as a household for an income of approx £60,000 leaving us £41,700 or £20,850 each.
So you must have a combined household income of about £250,000 and your tax and NI contribution is roughly 44% of your total income. Leaving you £140,000 or £70,000 each.
£14,000 income pays about 17% in tax and NI leaving £11,620
£18,000 income pays about 20% in tax and NI leaving £14,400
£25,0000 income pays about 23% in tax and NI leaving £19,250
£30,000 income pays about 25% in tax and NI leaving £22,500
£99,000 income pays about 35% in tax and NI leaving £64,350
£500,000 income pays about 47% in tax an NI leaving £265,000