An office service charge budget is the landlord's or managing agent's estimate of the cost of running a multi-let building for the coming service charge year, split into schedules and cost categories, apportioned to each tenant according to their lease, and issued to tenants with explanatory commentary at least one month before the year starts. In the UK the format and process are set by the RICS Professional Statement Service charges in commercial property (1st edition, effective 1 April 2019), which is mandatory for RICS members and firms and is written into most modern office leases as the standard of good practice.

Tenants challenge the budget more than any other document the building manager sends. They challenge the total, the apportionment, the management fee, the sinking fund contribution, and anything that looks like an improvement. This guide is about building the budget so that each of those challenges has an answer already in the pack: what the code requires, how to structure the schedules and cost lines, how to apportion, how to treat reserves, how to close the year, and what to do when the challenge comes anyway.

What the RICS code requires

The RICS service charge code, formally the Professional Statement, has nine mandatory requirements and a longer set of core principles. The mandatory ones that shape the budget are these.

Costs recovered must be in accordance with the lease, and the landlord may recover no more than 100% of the proper and actual cost of the services. There is no profit element and no loss: the service charge is a not-for-profit account.

A budget with explanatory commentary must be issued to all tenants annually, and the core principles put that at least one month before the start of the service charge year. A set of approved accounts showing the actual expenditure must be issued annually, with the core principles setting a target of four months after the year end. An apportionment matrix showing how the total is split between tenants must be issued annually.

Service charge monies, including sinking and reserve funds, must be held in one or more discrete or virtual bank accounts, and interest earned must be credited to the service charge account.

And on disputes: a tenant withholding payment should withhold only the sum actually in dispute, and a landlord who has raised an incorrect charge must correct it without undue delay.

Two core principles that are not mandatory but that tenants' advisers treat as if they were: management fees should be a fixed fee, not a percentage of expenditure, so the manager has no incentive to spend; and costs should be presented under the industry-standard cost classifications so that tenants can benchmark one building against another.

Budget structure: schedules and cost categories

A service charge budget has two dimensions. Schedules group costs by the part of the building that benefits from them. Cost categories group costs by what they are. Every line in the budget sits in one schedule and one category.

Schedules exist because not every tenant uses every service. A typical multi-let office has an Estate schedule (external areas, car park, landscaping, shared with other buildings if on an estate), a Building schedule (structure, common parts, lifts, plant that serves the whole building), and often separate schedules for Air Conditioning (only tenants with landlord-provided comfort cooling), Car Park (only tenants with allocated spaces), and Reception or Concierge where some floors have direct access. A tenant's apportionment can differ by schedule: 12% of the Building schedule, 0% of the Car Park schedule, 18% of the Air Conditioning schedule.

Cost categories follow the code's industry-standard classification. The service charge budget template below is a Building schedule for a 100,000 sq ft multi-let office with a management fee shown as a fixed sum; figures are illustrative.

Three things make this table defensible. Every line shows the prior year actual and the current year budget beside the proposed figure, so the tenant can see the trend without asking. Every material movement has a one-line explanation in the commentary column; the fabric line going down and the health and safety line going up are both explained before anyone asks. And the management fee is a fixed sum, not a percentage, which removes the first challenge most tenant advisers raise.

Add a covering note that states the service charge year, the date the budget was issued, the schedules and the apportionment basis for each, the on-account payment dates, and where the sinking fund plan can be inspected. That note is the "explanatory commentary" the code requires; a bare spreadsheet does not satisfy it.

Apportionment methods

Service charge apportionment is how each schedule's total is divided between the tenants on it. The lease fixes the method; the code requires it to be demonstrably fair and reasonable and requires the matrix to be issued to tenants annually.

• Floor area is the standard method for offices: the tenant's net internal area over the total lettable NIA of the schedule. Use the same measurement standard for every unit (IPMS 3 Office or the older RICS Code of Measuring Practice NIA, but not a mix), and hold the measured areas on the lease record with the source survey noted.

• Weighted floor area applies where some space benefits less from the services: storage or basement space weighted at 50%, for example. The weighting must be in the lease or agreed with tenants; a weighting applied unilaterally is the second most common challenge.

• Fixed percentages written into older leases are common and are a problem when they do not add up to 100% after a refurbishment changed the areas. The code says the landlord bears any shortfall from void or capped units; it does not let the landlord recover more than 100% from the remaining tenants.

• Voids and caps. The landlord pays the service charge on vacant units and absorbs any amount above a tenant's cap or fixed charge. The apportionment matrix should show the void and capped units and the landlord's contribution, so tenants can see the total recovered is not more than the total spent.

The matrix itself is a table: schedule by schedule, each unit's area, its percentage, the void percentage borne by the landlord, and a check that each schedule sums to 100%. Issue it with the budget and again with the accounts.

Sinking funds and reserves

The code distinguishes three things that leases and budgets routinely confuse.

1. A sinking fund accumulates contributions over several years to pay for the replacement of a specific major item at the end of its life: the chillers, the lifts, the roof covering. It is a plan with a target sum, a replacement date and an annual contribution derived from them. The illustrative budget above shows a ten-year chiller programme in its sixth year.

2. A reserve fund is a smaller float to smooth expenditure that recurs irregularly, such as external redecoration every five years, so that one year's service charge does not spike.

3. A depreciation charge is a charge for the wear of the landlord's plant, calculated on the plant's cost and life, and is recoverable only where the lease expressly allows it.

Whichever the lease permits, the code requires the money to be held in a discrete or virtual account, the interest to be credited to the fund, and the plan behind the fund (what it is for, the target, the timing) to be disclosed to tenants. A fund without a written plan is the item tenants' auditors challenge most easily, and the challenge usually wins.

Two further rules. Tenants pay into the fund on the basis of their apportionment, and a tenant that leaves before the money is spent does not get it back unless the lease says so, which is why incoming tenants' advisers ask for the fund balance at lease negotiation. And the fund can only be spent on what it was collected for; using the chiller fund to pay for a lift repair is a breach of trust in all but the loosest leases.

Year-end reconciliation and certification

The service charge reconciliation UK tenants expect runs to the code's four-month target: the service charge year closes, the actual expenditure is collated and reviewed, the accounts are prepared under the same schedules and categories as the budget, an independent accountant certifies them (or the manager certifies where the lease allows), and each tenant receives a statement showing its share of the actual cost, the on-account payments made, and the balancing charge or credit.

The reconciliation pack should contain the certified accounts, the apportionment matrix as applied to actuals, the tenant's statement, a variance report against the budget with commentary on every material line, and a note of the sinking fund movements and closing balance. Where the lease allows a tenant to inspect invoices, say so in the pack and say how.

The balancing charge is where the four-month target matters. A tenant that receives a balancing demand fourteen months after the year end will query every line and may have a lease argument that the demand is out of time. A tenant that receives it in month four, with a variance report that explains the movements, usually pays.

Two accounting points. Accrue for services delivered in the year but not yet invoiced, and disclose the accruals; the accounts are meant to show the cost of the year's services, not the invoices that happened to arrive. And treat the balancing credit to a tenant that has since vacated as a real liability: it is their money.

Common challenges from tenants

Most challenges fall into six groups, and the budget pack can pre-empt each.

1. "The management fee is too high." Answer: it is a fixed fee, stated in the budget, benchmarked to the building's size and services, and not linked to expenditure. If the lease allows a percentage fee the code still expects it to be reasonable; state the effective percentage anyway.

2. "This is an improvement, not a repair." The lease usually allows repair, maintenance and replacement but not improvement. The BMS controls upgrade in the illustrative budget is the kind of line this lands on. Answer it with the reason in the commentary: the existing controls are obsolete and unsupported, replacement with a like-for-like system is not available, and the new system is the modern equivalent. If it is an improvement, take it out of the service charge.

3. "Our apportionment is wrong." Answer with the measured area, the survey it came from, the schedule the tenant is on and the percentage. If the tenant's own survey differs, the lease says which prevails.

4. "We don't use the air conditioning / car park / reception." Answer with the schedule structure: the tenant is only on the schedules that serve its demise, and the matrix shows it. If the tenant is on a schedule it does not benefit from, the schedule structure is wrong and should be corrected.

5. "The sinking fund has no plan." It must have one. Issue it.

6. "The accounts are late." Four months is the target. If the accounts are late, say why and when they will issue; do not let the balancing demand go out without the accounts.

Where a challenge becomes a dispute, the code's position is that the tenant withholds only the amount in dispute and the landlord corrects any error promptly. Most office leases include an alternative dispute resolution route, and the code encourages its use before litigation.

Managing schedules in an ERP

The budget, the matrix, the on-account demands, the accruals and the reconciliation are one data set viewed five ways. The spreadsheet approach keeps five copies of it, and the copies drift.

In RIOO on NetSuite, each building carries its schedules, each schedule carries its cost categories and lines, and each lease carries its apportionment percentage per schedule with the measured area and survey reference behind it. The budget is entered against the lines; the on-account demand for each tenant is generated from the budget and the matrix, quarterly or monthly as the lease requires. Vendor bills are coded to schedule and line at AP entry, so actuals accumulate against the budget through the year and the variance report is available on any day, not only at year end. Accruals post to the same lines. The sinking fund is a separate balance on the building with its own contributions, interest and drawdowns. At year end, the reconciliation runs from the coded actuals, produces each tenant's statement and balancing charge, and posts the invoices or credits. The certified accounts are the same figures in the accountant's format.

That is how RIOO's property accounting on NetSuite runs service charges for multi-let office buildings. The UAE counterpart, where the framework is Mollak rather than the RICS code, is in our guide to service charge and Mollak software for Dubai. For the US equivalent of the reconciliation process, see CAM reconciliation for commercial leases.

Frequently asked questions

Q1. What should an office service charge budget include?
The estimated cost of each service for the coming year, organised by schedule (the part of the building the cost serves) and by the RICS industry-standard cost categories (management, utilities, soft services, hard services, insurance, exceptional expenditure and income), with prior year actuals and current year budget alongside, an explanatory commentary on material movements, the apportionment matrix, and the on-account payment dates.

Q2. When must a service charge budget be issued in the UK?
The RICS Professional Statement requires budgets to be issued annually and its core principles set the timing at least one month before the start of the service charge year. The lease may set its own deadline, which prevails if stricter.

Q3. How is service charge apportioned between office tenants?
Usually by floor area: the tenant's net internal area as a proportion of the total lettable area on each schedule, using one measurement standard for the building. Weighted areas and fixed percentages appear in some leases. The landlord bears the share attributable to vacant units and any amount above a tenant's cap, and may not recover more than 100% of actual cost.

Q4. What is the difference between a sinking fund and a reserve fund?
A sinking fund accumulates over several years to replace a specific major item, such as chillers or lifts, against a written plan with a target sum and date. A reserve fund smooths irregular recurring costs, such as five-yearly redecoration. Both must be held in a discrete or virtual account with interest credited, and both must be disclosed to tenants.

Q5. How soon after year end must the service charge reconciliation be issued?
The RICS code's core principles set a target of four months after the service charge year end for certified accounts and balancing statements. Late reconciliations are the most common source of disputes and may be challenged under the lease's own time limits.

Related reading

• Service charge and Mollak software for Dubai
• CAM reconciliation for commercial leases
• CAM caps, exclusions and controllable expenses explained
• Lease abstraction checklist: 40 fields to capture