hi
if you're earning 17k, tax will be at 2 different bands, the 1st 2150 @ 10% and the rest at 22%, provided u take off your personal allowance. The Persoanl allowance is 5035 for 06/07
i.e 17000 - 5035 = 11965.
2150 * 10% = 215
11965-2150 = 9815 *22% = 2159.30
Total tax for the year is: 2374.30
NI is at roughly 11% though im not sure - cant remember been a long time since i sat the ATT.
Say 11% is roughly 1870 for the year.
if u got student loans that will be taken into consideration.
on estimate you should get:
17000 - 1870 - 2374.30 = 1062.98 roughly per month.
but dont forget any benefits which are taxable to you and student loans.