Base rent: what it is and how to calculate it
Base rent is the fixed part of the rent in a lease. This guide explains what it covers, how it is calculated with a worked example, how it changes during the lease and what it takes to keep it right across a portfolio.
9 October 2026 · VemLease team, Vemco Group
Base rent is the fixed rent a tenant pays for the space itself. It is the amount the lease sets for occupying the unit, before service charges, taxes, insurance and utilities are added, and before any turnover rent. It is also called minimum rent or fixed rent. In shopping centre leases with turnover rent it is the minimum the landlord receives whatever the tenant sells.
What base rent covers and what it does not
What a tenant pays in total is usually more than the base rent. The lease decides which costs come on top of it.
- Base rent: the fixed amount for the space, normally quoted as a rate per square foot or square metre per year.
- Additional charges: the tenant’s share of the cost of running the property, such as service charges or common area maintenance (CAM), property taxes, insurance and utilities.
- Turnover rent: in some retail leases, a percentage of the tenant’s sales on top of the base rent.
How much is inside the base rent depends on the lease. In some leases the base rent already includes most of the running costs (a gross lease). In others the tenant pays the base rent and then some or all of those costs separately (a net lease). Two leases with the same base rent can therefore cost a tenant very different amounts. How the shared costs are settled with tenants each year is covered on our page on CAM and service charge reconciliation.
How to calculate base rent
Base rent is normally a rate multiplied by the area of the unit.
Annual base rent = rate per square foot per year × area of the unit
Monthly base rent = annual base rent ÷ 12
A worked example
The figures are an example, not market data. A shop of 2,400 square feet is let at a rate of 25 per square foot per year.
- Annual base rent: 2,400 × 25 = 60,000.
- Monthly base rent: 60,000 ÷ 12 = 5,000.
- If the lease adds service charges of 10 per square foot per year, the tenant pays another 24,000 a year, so 84,000 in total before any turnover rent.
How base rent changes during the lease
Base rent is fixed, but it is rarely the same for the whole term. The lease sets when and how it changes.
- Rent steps: increases agreed in advance, on fixed dates, as an amount or a percentage.
- Indexation: the rent follows a published index, such as a consumer price index, from a date the lease names.
- Rent review: the rent is reset at set intervals, for example to the market level.
- Rent-free period: months at the start of the lease in which no base rent, or a reduced one, is paid.
An example of rent steps on the shop above, with the rate rising by 1 per square foot each year (example figures):
| Lease year | Rate per square foot | Annual base rent | Monthly base rent |
|---|---|---|---|
| 1 | 25 | 60,000 | 5,000 |
| 2 | 26 | 62,400 | 5,200 |
| 3 | 27 | 64,800 | 5,400 |
This guide explains the mechanics. What a lease may or must say about rent increases is a matter for your legal adviser.
Base rent and turnover rent
In many shopping centre leases the base rent is a minimum, and turnover rent is paid on top once the tenant’s sales pass a breakpoint. The natural breakpoint is the base rent divided by the percentage. With a base rent of 60,000 and a percentage of 8%, turnover rent starts when annual sales pass 750,000. So a rent step or an indexation of the base rent also moves the breakpoint, unless the lease fixes the breakpoint separately.
The full calculation is in our guide to turnover rent.
Where base rent goes wrong in practice
- A rent step is missed. The date passes and the old rent is billed until someone notices.
- Indexation is applied late. The new rent is worked out weeks after the date in the lease, and the difference has to be billed afterwards.
- The area changes and the rent does not. A unit is split or merged, and the base rent still follows the old area.
- The rent roll and the invoices disagree. The rent is kept in a spreadsheet and billed from another system.
How VemLease handles base rent
In VemLease the base rent is part of the lease. Rent steps, indexation and turnover rent are set on the lease in one flow, so the rent that applies later is on the lease from the start. Critical dates, options and renewals are tracked on the same leases, with alerts before they fall due.
The rent roll, invoice management and revenue tracking sit in the same system as the leases, across all assets and entities, so a change to a lease is a change to the rent roll. One lease can hold several units, each with its own end date. When a unit is split or merged it is ended, never deleted, so its history stays.
Read more about the rent roll, tenant billing and invoicing and lease tracking and critical dates.
Questions about base rent
What is base rent?
Base rent is the fixed rent a lease sets for the space itself, before additional charges such as service charges, taxes, insurance and utilities, and before any turnover rent.
Is base rent the same as total rent?
No. Total rent is the base rent plus the additional charges the lease passes on to the tenant, plus turnover rent where the lease has it. In the example above the base rent is 60,000 a year and the total with service charges is 84,000.
How is base rent calculated?
Normally as a rate per square foot or square metre per year multiplied by the area of the unit. A unit of 2,400 square feet at 25 per square foot per year has an annual base rent of 60,000, or 5,000 a month.
Does base rent go up during a lease?
Usually, when the lease says so. The common ways are rent steps agreed in advance, indexation to a published index and rent reviews at set intervals.
What is the difference between base rent and minimum rent?
They normally mean the same thing. Minimum rent, or minimum guaranteed rent, is the name used in shopping centre leases with turnover rent, where the base rent is the least the tenant pays whatever its sales are.
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