How the monthly top-up is calculated
Tax-Free Childcare works by matching your deposits at a ratio of 20p for every 80p you put in. If you spend £800 a month on childcare, you deposit £800 and the government adds £200. The cap is £500 per child per quarter, which works out at roughly £167 per child per month.
For two children, the combined monthly cap is around £333. For three, around £500. Once you hit the cap, additional spending above that level does not attract further top-up.
Comparing the monthly route against the UC childcare element
Tax-Free Childcare gives a flat 20% top-up capped by family size. Universal Credit childcare support reimburses up to 85% of eligible costs, but is reduced as earnings rise and is only available to UC claimants. For low-income families already on UC with large childcare bills, UC childcare support is usually worth significantly more.
For moderate to higher earners who are not on UC, or families whose income is above the UC taper-out point, Tax-Free Childcare is the main option. The comparison calculator on the full Tax-Free Childcare page shows the trade-off side by side.
Applying and maintaining your account
Applications are through the Government Gateway. Both partners in a couple must be working and earning at least the equivalent of 16 hours at the National Minimum Wage to qualify. Eligibility is reconfirmed every 3 months, missing the reconfirmation window pauses the top-up.
Free childcare hours (15 or 30 hours depending on age and entitlement) can be combined with Tax-Free Childcare. The free hours are applied to the nursery invoice first; TFC top-up then applies to the remaining privately paid portion.