And by "tax deductible" I mean working parents should not have to pay any tax (income, NI, etc.) on the income which they use to pay for childcare.
Scrap the childcare vouchers which result in a pension reduction, and just work out what our taxable income is AFTER the cost of childcare is subtracted.
Childcare is after all a cost incurred for the sole purpose of going to work.
And, it would help keep people in work because it would be more affordable for lower and middle earners to actually go to work.