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) | £5,893 | £17,679 |
| Boarding (Years 7-13) | £11,171 | £33,513 |
| Sixth Form Boarding (Entry after Year 10) | £12,129 | £36,387 |
| Sixth Form Foundation Year | £12,129 | £36,387 |
| Monmouth School for Girls | Termly | Annual |
| Day pupils (Years 7-11) | £5,505 | £16,515 |
| Day pupils (Years 12-13) | £5,893 | £17,679 |
| Boarding (Years 7-11) | £10,780 | £32,340 |
| Boarding (Years 12-13) | £11,171 | £33,513 |
| Sixth Form Boarding (Entry after Year 10) | £12,129 | £36,387 |
| Sixth Form Foundation Year | £12,129 | £36,387 |
| Monmouth Prep School | Termly | Annual |
| Nursery – 4 sessions | £1,683 | £5,049 |
| Nursery – 5 sessions | £1,834 | £5,502 |
| Nursery – 6 sessions | £1,985 | £5,955 |
| Nursery – 7 sessions | £2,134 | £6,402 |
| Nursery – 8 sessions | £2,285 | £6,855 |
| Nursery – 9 sessions | £2,435 | £7,305 |
| Nursery – 10 sessions | £2,585 | £7,755 |
| Reception – Year 2 | £2,820 | £8,460 |
| Years 3-6 (Day) | £4,133 | £12,399 |
| Years 3-6 (Boarding) | £7,454 | £22,362 |
