The income which the schools receive from the William Jones Foundation helps us to maintain the fees at a reasonable level, as well as maintain the high standards of academic teaching and carry out improvements to the facilities. Boarding fees are amongst the best value in the UK.
| Monmouth School for Boys | Termly | Annual |
| Day pupils (Years 7-13) | £5,533 | £16,599 |
| Boarding (Years 7-13) | £10,489 | £31,467 |
| Sixth Form Boarding (Entry after Year 10) | £11,389 | £34,167 |
| Sixth Form Foundation Year | £11,389 | £34,167 |
| Monmouth School for Girls | Termly | Annual |
| Day pupils (Years 7-11) | £5,169 | £15,507 |
| Day pupils (Years 12-13) | £5,533 | £16,599 |
| Boarding (Years 7-11) | £10,122 | £30,366 |
| Boarding (Years 12-13) | £10,489 | £31,467 |
| Sixth Form Boarding (Entry after Year 10) | £11,389 | £34,167 |
| Sixth Form Foundation Year | £11,389 | £34,167 |
| Monmouth Prep School | Termly | Annual |
| Nursery – 4 sessions | £1,580 | £4,740 |
| Nursery – 5 sessions | £1,722 | £5,166 |
| Nursery – 6 sessions | £1,864 | £5,592 |
| Nursery – 7 sessions | £2,004 | £6,012 |
| Nursery – 8 sessions | £2,146 | £6,438 |
| Nursery – 9 sessions | £2,286 | £6,858 |
| Nursery – 10 sessions | £2,427 | £7,281 |
| Reception – Year 2 | £2,648 | £7,944 |
| Years 3-6 (Day) | £3,881 | £11,643 |
| Years 3-6 (Boarding) | £6,999 | £20,997 |
