"OP are you sure tax credits are not overpaying you? "
Don't think so:
£6105 for 2 children CTC
£4780 for single parent working full time WTC
MINUS
(£8400 (income) - £6420 (threshold)) * 41% = £811
Gives £10,074
Child care costs are paid base on a a max child care cost of £175/week 1 child, £300/week 2 children, i.e. £9100/year for one child, or £15,600/year for two
OP is paying £900/month child care (£700 nursery and £200 childminder), which is £10,800
WTC for childcare is 70% of the cost, i.e. £10800 * 70% = £7560
£7560 + £10074 = £17,634
Tax credits of £300/week = 300 * 52 = £15,600
So the tax credits number seems a bit low. I suspect OP is not claiming for the child minder?
So her actual income should be:
tax credits: £10,074 (excluding child care)
income: £8400 minus £3240 (30% of £10800 child care cost) = £5,160
housing benefit: £2400
child maintenance: £8400
= £26,034 net
Outgoings:
Rent £12,000
Council tax: £1,320
Phone/utility: ~£2400
Car: £1500?
= £17,220
which leaves £8814 left over for food and so on.
Seems to be plenty of money even now, but:
- debt
- council tax support should be being claimed, I don't see it mentioned
- council tax single person's discount?
- WTC for child minder probably not being claimed?
- child benefits haven't been mentioned - another £1800 here
- the housing benefit of £200/month is not plausible at all. It should be much higher than that - child maintenance isn't taken into account, and broadly speaking on those income figures you are going to get most of the LHA rate paid (i.e. most of the cost of the 30th percentile 2-bed house in the OP's area. The HB is likely to be £500/month or more.
So basically plenty of money and you either aren't counting it properly or you can claim much more than you are saying here.