Civometry

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, 2023-24 to 2025-26

261 claims, £459,670 paid. The headings are IPSA’s own categories grouped; the categories inside each are named on the register page.

CategoryWhat it coversClaimsPaidShare
StaffingThe salaries and employment costs of the people an MP employs to run their office and casework. IPSA pays these directly; they are not money an MP receives.3£351,87376.5%
Office costsRenting and running a constituency office: rent, utilities, equipment, stationery and postage.214£54,78611.9%
AccommodationThe cost of somewhere to stay for an MP whose constituency is far enough from Westminster that IPSA's rules allow it. An MP representing a London seat is not eligible on the same terms.22£35,8857.8%
TravelJourneys between the constituency and Westminster and within the constituency. Until 2018-19 IPSA published one travel category; from 2019-20 it publishes travel by the MP, by staff and by a dependant separately.21£16,7003.6%
MiscellaneousClaims IPSA records under none of the headings above. Called “Miscellaneous Expenses” until 2018-19.1£4260.1%

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.

YearClaimsStaffingOffice costsAccommodationTravelMiscellaneousTotal
2023-24137£108,863£20,551£9,545£6,309£426£145,693
2024-2596£243,010£27,546£26,340£10,391—£307,288
2025-2628—£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, 2023-24 to 2025-26

The cost types IPSA records inside each heading, largest first by what it paid.

Staffing

Cost typeClaimsPaid
Payroll2£351,311
Pooled staffing services1£563

Office costs

Cost typeClaimsPaid
Rent9£31,669
Equipment - purchase54£6,784
Stationery & printing54£5,356
Software & applications10£3,276
Landline phone & internet - rental & usage28£2,039
Waste disposal, confidential waste & rubbish collection7£1,611

Accommodation

Cost typeClaimsPaid
Rent22£35,885

Travel

Cost typeClaimsPaid
Rail10£8,009
Hotel - London2£7,096
Mileage - car5£897
Hotel - UK Not London2£685
Other public transport2£12

Miscellaneous

Cost typeClaimsPaid
Removals1£426

Largest claims, 2023-24 to 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.

DateCategoryCost typeDescriptionClaimedPaid
31 March 2025StaffingPayrollTotal Staffing budget payroll costs for the 2024-25 year£243,010£243,010
31 March 2024StaffingPayrollTotal Staffing budget payroll costs for the 2023-24 year£108,300£108,300
31 March 2025Office CostsRentAggregated figure for this business cost and budget category in 2024-25£20,002£20,002
31 March 2025Staff TravelHotel - LondonAggregated figure for travel during 2024-25£4,260£4,260
31 March 2024Staff TravelHotel - LondonAggregated figure for travel during 2023-24£2,836£2,836
31 March 2025MP TravelRailAggregated figure for travel during 2024-25£2,709£2,709
22 October 2025Office CostsEquipment - purchaseOther office equipment£2,676£2,676
31 March 2025Staff TravelRailAggregated figure for travel during 2024-25£2,251£2,251
1 April 2025AccommodationRent—£2,195£2,195
4 March 2025AccommodationRent—£2,195£2,195
4 February 2025AccommodationRent—£2,195£2,195
6 January 2025AccommodationRent—£2,195£2,195
3 December 2024AccommodationRent—£2,195£2,195
5 November 2024AccommodationRent—£2,195£2,195
1 October 2024AccommodationRent—£2,195£2,195

Claims refused and money repaid, 2023-24 to 2025-26

7 claims carry an amount IPSA did not pay or an amount repaid to it: £0 not paid and £927 repaid. A refusal is not a finding of wrongdoing — most are claims outside the scheme’s rules, or submitted without the evidence IPSA requires — and it is shown because leaving it out would show only the money that went out.

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