MPs’ business costs
Keir Mather
IPSA paid £459,670 against 261 published rows for Keir Mather between 2023-24 and 2025-26 as the member for Selby and Ainsty CC, then Selby CC. These are the costs of running an office and employing staff under IPSA’s rules. They are not salary, and the largest part of them is wages IPSA pays to the member’s employees rather than money the member receives.
By category, 2025-26
28 claims, £6,688 paid. The headings are IPSA’s own categories grouped; the categories inside each are named on the register page.
| Category | What it covers | Claims | Paid | Share |
|---|---|---|---|---|
| Office costs | Renting and running a constituency office: rent, utilities, equipment, stationery and postage. | 28 | £6,688 | 100.0% |
Every year in the register
Keir Mather’s own years, not the register’s: the first is 2023-24 and the last is 2025-26. Figures are not adjusted for inflation, so a rise between two distant years is partly a rise in prices. Select a year to read it on its own.
| Year | Claims | Staffing | Office costs | Accommodation | Travel | Miscellaneous | Total |
|---|---|---|---|---|---|---|---|
| 2023-24 | 137 | £108,863 | £20,551 | £9,545 | £6,309 | £426 | £145,693 |
| 2024-25 | 96 | £243,010 | £27,546 | £26,340 | £10,391 | — | £307,288 |
| 2025-26 | 28 | — | £6,688 | — | — | — | £6,688 |
A year in which Keir Mather joined or left the House part-way through is a part year, and is not comparable with a full one.
What each category is made of, 2025-26
The cost types IPSA records inside each heading, largest first by what it paid.
Office costs
| Cost type | Claims | Paid |
|---|---|---|
| Equipment - purchase | 3 | £2,966 |
| Landline phone & internet - rental & usage | 11 | £850 |
| Software & applications | 3 | £759 |
| Insurance - buildings | 1 | £419 |
| Waste disposal, confidential waste & rubbish collection | 1 | £331 |
| Cleaning services | 1 | £314 |
Largest claims, 2025-26
The 15 rows IPSA paid most against, with IPSA’s own description of each. Read the description before the amount: IPSA publishes most of a member’s staffing as one row for the whole year — “Total Staffing budget payroll costs for the ⟨year⟩ year” — so the largest row here is usually a year of wages for the member’s employees and not something bought.
| Date | Category | Cost type | Description | Claimed | Paid |
|---|---|---|---|---|---|
| 22 October 2025 | Office Costs | Equipment - purchase | Other office equipment | £2,676 | £2,676 |
| 15 September 2025 | Office Costs | Software & applications | ELECTED TECHNOLOGIES | £738 | £738 |
| 16 October 2025 | Office Costs | Insurance - buildings | Insurance rent invoice for constituency office | £419 | £419 |
| 11 March 2026 | Office Costs | Waste disposal, confidential waste & rubbish collection | Waste collection for constituency office | £331 | £331 |
| 12 November 2025 | Office Costs | Cleaning services | [***] [***] | £314 | £314 |
| 26 March 2026 | Office Costs | Stationery & printing | Stationery for use on constituency school visits | £218 | £218 |
| 28 November 2025 | Office Costs | Advertising and contact cards | Badges for distribution at school visits | £200 | £200 |
| 20 May 2025 | Office Costs | Equipment - purchase | Other office equipment | £180 | £180 |
| 5 January 2026 | Office Costs | TV licence | TVLICENSING.CO.UK | £175 | £175 |
| 23 October 2025 | Office Costs | Software & applications | KAPWING PRO PLAN | £149 | £149 |
| 16 April 2025 | Office Costs | Maintenance, Redecorations & Repairs | PAT testing for appliances in constituency office | £135 | £135 |
| 12 October 2025 | Office Costs | Insurance - contents | HISCOXME | £116 | £116 |
| 20 June 2025 | Office Costs | Equipment - purchase | Other office equipment | £110 | £110 |
| 5 November 2025 | Office Costs | Landline phone & internet - rental & usage | Landline | £84 | £84 |
| 4 August 2025 | Office Costs | Landline phone & internet - rental & usage | Landline | £77 | £77 |
What this page does not show
Whether any of it was justified. IPSA accepted these claims under its own rules and the register records what was paid, not whether it should have been. A large total is not a finding about the member.
Nor how Keir Mather compares with another member. After staffing the largest headings are accommodation and travel, and both are decided mostly by where a constituency is: a member several hundred miles from Westminster is eligible for costs a member with a London seat is not. Two members’ totals are two sets of rules as much as two sets of choices, and the length of service differs too.
It is also not pay. IPSA sets and publishes MPs’ salaries separately and they are not in this register; the staffing figure here is the salaries of the member’s employees.
All MPs’ business costs · Keir Mather’s register of interests and votes · Sources