Proportionality Challenges in Detailed Assessment: Paying Party Strategy

Feb 14
3 min read

Updated: Mar 12

Proportionality is now one of the most effective tools available in paying party costs disputes on detailed assessment. Under CPR 44.3, costs which are disproportionate may be reduced even if they were reasonably or necessarily incurred, with any doubt resolved in favour of the paying party.

In practice, this enables global reductions to bills that would otherwise survive line-by-line scrutiny. When used alongside hourly rate challenges, delegation arguments and targeted Points of Dispute, proportionality can materially reduce exposure and shift settlement dynamics.

The CPR 44.3 Proportionality Test

On the standard basis, the court will only allow costs which are proportionate to the matters in issue and may reduce costs that are disproportionate even if they were reasonably incurred. Any doubt is resolved in favour of the paying party. This creates a distinct second stage of assessment beyond reasonableness.

The “Stand Back” Approach on Detailed Assessment

The court will first assess individual items for reasonableness and then stand back to consider whether the total figure is proportionate. If the overall sum is disproportionate, a broad-brush reduction may be applied. This global approach is where the most significant paying party reductions are achieved.

The Five CPR 44.3(5) Factors in Practice

Costs are proportionate if they bear a reasonable relationship to:

The sums in issue
The value of non-monetary relief
The complexity of the litigation
Conduct generating additional work
Wider factors such as reputation or public importance

Low-value claims with high incurred costs remain particularly vulnerable.

Proportionality vs Reasonableness

Reasonableness is assessed item by item. Proportionality is assessed globally.

Costs can therefore be reasonable but still irrecoverable as disproportionate.

This distinction underpins effective proportionality challenges in costs.

Budgeted Cases and Proportionality Arguments

An approved budget does not prevent proportionality reductions at detailed assessment. The court may still consider whether the total costs claimed bear a reasonable relationship to the matters in issue.

Budget compliance is relevant but not determinative.

Paying Party Strategy for Global Reductions

Effective proportionality arguments should be linked to:

Excessive Grade A/B time on routine tasks
Failure to delegate
Disproportionate work relative to claim value
Over-litigation of straightforward issues
Block-billed phases

These points should be pleaded clearly in points of dispute and replies rather than left to general submission. Proportionality should also be combined with guideline hourly rate challenges to reinforce the global reduction argument. Delegation failures should be identified by reference to the delegation of work in costs budgeting to demonstrate inappropriate fee earner allocation.

Common Receiving Party Pitfalls

Receiving parties frequently:

Rely on reasonableness without addressing proportionality
Fail to justify Grade A/B involvement
Ignore the relationship between costs and value
Treat budgets as a shield

These approaches are vulnerable to global reductions on detailed assessment.

Drafting Effective Points of Dispute on Proportionality

Proportionality arguments should:

Identify the total figure said to be proportionate
Refer to the CPR 44.3(5) factors
Link hourly rate, delegation and phase totals
Invite a stand-back reduction

A generic statement that costs are disproportionate is ineffective. Properly structured points of dispute and replies are critical to advancing the argument.