The income which the schools receive from the William Jones Foundation allows us to maintain fees at a competitive level and to provide financial assistance for pupils who otherwise would not be able to afford to attend the schools.
| Monmouth School for Boys | Termly | Annual |
| Day pupils (Years 7-13) | £6,659 | £19,977 |
| Boarding (Years 7-13) | £12,847 | £38,541 |
| Sixth Form Boarding (Entry after Year 10) | £13,948 | £41,844 |
| Sixth Form Foundation Year | £13,948 | £41,844 |
| Monmouth School for Girls | Termly | Annual |
| Day pupils (Years 7-11) | £6,331 | £18,993 |
| Day pupils (Years 12-13) | £6,659 | £19,977 |
| Boarding (Years 7-11) | £12,397 | £37,191 |
| Boarding (Years 12-13) | £12,847 | £38,541 |
| Sixth Form Boarding (Entry after Year 10) | £13,948 | £41,844 |
| Sixth Form Foundation Year | £13,948 | £41,844 |
| Monmouth Prep School | Termly | Annual |
| Nursery – 4 sessions | £1,902 | £5,706 |
| Nursery – 5 sessions | £2,072 | £6,216 |
| Nursery – 6 sessions | £2,243 | £6,729 |
| Nursery – 7 sessions | £2,411 | £7,233 |
| Nursery – 8 sessions | £2,582 | £7,746 |
| Nursery – 9 sessions | £2,752 | £8,256 |
| Nursery – 10 sessions | £2,921 | £8,763 |
| Reception – Year 2 | £3,187 | £9,561 |
| Years 3-6 (Day) | £4,670 | £14,010 |
| Years 3-6 (Boarding) | £8,572 | £25,716 |
