NEC4 Fee Percentage in Earned Value Explained

The NEC4 fee percentage is the contractor's mark-up on Defined Cost. It covers head office overheads, profit, and corporate risk, one single percentage applied to every pound of Defined Cost incurred on the project. If you're running earned value management on an NEC4 contract, the fee is the thing that makes your Actual Cost diverge from what the work "really" cost to deliver.

Fee percentage is part of the earned value definitions glossary. For the full formula framework, see the earned value formulas page.

The Definition

The fee percentage is stated in Contract Data Part 2 (the contractor's offer). It's a single figure, say 8%, applied to the Defined Cost of work done to date. On a month where Defined Cost is £800,000, the fee is £64,000. That's it.

NEC4 simplified this from NEC3, where you had two separate fee percentages: one for subcontracted work and one for directly provided work. That distinction caused endless arguments about which category certain costs fell into. NEC4 collapsed them into one percentage. Cleaner. Less to argue about.

How It Works Under NEC4

The fee gets added to Defined Cost to form the Price for Work Done to Date (PWDD). The PWDD is the basis for interim payments on Option C and Option E contracts.

 PRICE FOR WORK DONE TO DATE (PWDD) =================================== Defined Cost Fee % PWDD (actual spend) (contractor's (basis for mark-up) payment) ┌──────────────┐ │ │ │ £5,200,000 │ x 1.08 = £5,616,000 │ │ (8%) │ Defined │ │ Cost │ └──────────────┘ │ │ ▼ ▼ Goes into AC Goes into AC (EVM metric) (if using PWDD as AC basis) ───────────────────────────────────────────── KEY POINT: Which figure you use as AC in EVM depends on whether you include or exclude the fee from your cost baseline. 

This is where EVM gets tricky on NEC4. Your AC can either include or exclude the fee. Both approaches work, but you must be consistent. Mix them up and your CPI is meaningless.

The EVM Alignment Problem

Here's the issue I see on probably two thirds of NEC4 projects running EVM.

The Budget at Completion (BAC) is set from the target total of the Prices, which includes the fee. So BAC already has fee baked in. But when teams collect AC data from cost reports, they often use Defined Cost without the fee. Now your BAC includes 8% more than your AC does. Your CPI looks artificially healthy.

Two options. Both are valid:

The golden rule: whatever you choose, apply it consistently to BAC, EV, and AC.

I've seen teams use gross BAC with net AC and wonder why their CPI was always above 1.0. It wasn't good performance. It was an 8% accounting error.

Worked Example: Fee Percentage on a £15M Option C Contract

How Fee Interacts With Pain/Gain Share

On Option C, the pain/gain calculation compares PWDD (Defined Cost + fee) against the target total of the Prices. The fee is already in both numbers, so it cancels out. The contractor's actual share depends on real cost performance, not the fee percentage itself.

But here's something most people miss. If Defined Cost comes in exactly on target, the contractor still earns the full fee. The fee isn't at risk in the pain/gain mechanism, only the share of over/underperformance is. On a £15M target with 8% fee, the fee component is roughly £1.1M. That's guaranteed revenue unless Defined Cost blows out so badly that the contractor's share of the pain exceeds the fee earned.

I've worked on a project where the commercial director didn't understand this. He thought the fee was "profit at risk." It's not. It's overheads and profit built into the Prices. Pain/gain operates on top of it.

Common Mistakes

1. Mixing gross and net figures in EVM. This is the big one. If BAC includes fee but AC doesn't, your CPI is wrong by whatever the fee percentage is. On an 8% fee, that's an 8% error. Enough to turn a genuine overrun into an apparent underspend.

1. Assuming the fee percentage is profit. It's not. Fee covers head office overheads, insurance, corporate costs, and profit. On a typical 8% fee, the actual profit element might only be 2-3%. The rest is real overhead that the contractor incurs whether the project runs or not.

1. Forgetting to apply fee to compensation events. When you assess a CE, the Defined Cost of the event gets the fee added on top. A CE with £100,000 of Defined Cost at 8% fee = £108,000 adjustment to the Prices. If you update BAC with just the Defined Cost and not the fee, your target is understated.

1. Using NEC3 fee structure on NEC4 contracts. NEC3 had separate subcontract and direct fee percentages. NEC4 has one. If you're porting an NEC3 spreadsheet to an NEC4 project, make sure you've collapsed the two percentages into one.

Frequently Asked Questions

What's a typical NEC4 fee percentage?

It varies enormously by sector and contractor. On major infrastructure (rail, highways), I typically see 6-10%. On building works, 8-15%. On smaller projects or where the contractor is desperate for work, I've seen fees as low as 3%. The fee reflects the contractor's assessment of their overhead recovery needs and competitive positioning.

Does the fee percentage change during the contract?

No. The fee percentage is fixed in Contract Data Part 2. It doesn't change regardless of what happens on the project. Even if the contractor's actual overheads increase, the fee stays at the tendered rate. That's the deal.

Should I include fee in AC when running EVM?

Either approach works. What matters is consistency. If your BAC comes from the target total of the Prices (which includes fee), then your AC should also include fee. If you strip fee out of BAC to work on a net Defined Cost basis, strip it out of AC too. See the worked example above.

How does fee percentage differ from margin?

Fee is the contractual mark-up on Defined Cost. Margin is the actual profit the contractor earns after all costs. If the fee is 8% but overheads consume 6%, margin is roughly 2%. And if Defined Cost overruns, margin can be zero or negative, even though the fee percentage hasn't changed.