The government has announced an increase to the mileage allowance rate for employees using their own fuel cars for business travel, with the approved rate rising by 10p per mile. While the headline sounds simple, the operational and commercial implications for businesses are broader than many realise.

For businesses with travelling teams, field-based employees or regular client visits, this is not just a payroll adjustment. It is a chance to review how expenses, budgeting and employee communication are managed across the business.

And for many employers, the bigger risk is not the additional cost. It is allowing frustration and inconsistency to build internally because it isn’t addressed properly.

Why this matters

Mileage claims can often feel like a small administrative detail.

But for employees regularly covering significant distances, fuel, maintenance and vehicle running costs have become a meaningful personal expense. If reimbursement rates fail to keep pace with reality, employees often absorb the difference themselves.

Technically, employees can claim the shortfall as a tax deduction through their tax return if their employer reimburses below HMRC-approved rates.

In reality, most never do.

Instead, they simply feel out of pocket.

Over time, that can impact morale, engagement and perceptions of fairness, particularly in businesses where travel is a core part of the role.

Questions every business should now ask

1. Do your systems and processes need updating?

Many businesses have automated mileage workflows sitting within payroll, expense management software or finance systems.

If rates increase but systems are not updated correctly:

• Employees may be underpaid
• Payroll reporting may become inconsistent
• Finance teams may spend unnecessary time correcting claims manually
• Reporting and budgeting may become distorted

This change may be a good trigger point to review whether your expenses process is still fit for purpose.

2. Does your expenses policy need reviewing?

Some businesses automatically mirror HMRC-approved mileage rates.

Others apply their own internal rates.

Now is the time to revisit:

• What your current policy says
• Whether rates remain commercially fair
• Whether different employee groups are treated consistently
• What is your employees responsibility in relation to their expenses
• Whether you have timely but reasonable cut off for submission of expenses
• Whether approval processes still make sense operationally

If your policy does not change, that decision should still be intentional and clearly communicated.

3. Have you explained the position to staff?

One of the biggest mistakes businesses make is assuming employees will not notice.

Even if you decide not to increase reimbursement rates immediately, proactive communication matters.

Explain:

• Whether your business is adopting the new rate
• When changes will apply
• How mileage should be submitted
• Whether there are any tax implications employees should understand

Silence tends to create frustration faster than the actual policy decision itself.

4. Do clients need to be informed?

For businesses that recharge travel expenses to clients, this could directly affect pricing and project costs.

That may require:

• Updating engagement terms
• Informing clients proactively
• Reviewing project profitability
• Revisiting charge-out assumptions

For service-based businesses operating on tighter margins, small cost increases across a travelling workforce can quickly compound.

5. Does your budget still reflect operational reality

If your business has significant travel activity, this increase may have a wider impact on forecasts and budgets.

Particularly for:

• Field service businesses
• Recruitment firms
• Care providers
• Construction and engineering businesses
• Multi-site operators

This is exactly where better management reporting becomes valuable.

Small operational cost changes often reveal bigger questions around:

• Profitability by team or client
• Travel efficiency
• Pricing structure
• Resource allocation
• Cashflow forecasting

Businesses that stay close to the numbers make faster, better decisions.

What about the tax position?

Where employers reimburse mileage at the increased approved rate, the additional 10p is generally tax deductible for the business as an allowable expense.

If businesses choose not to adopt the increase, employees may be able to claim tax relief personally on the difference between what they received and the approved rate.

However, many employees either do not realise this or never submit the claim.

This is bigger than mileage

The mileage increase itself is relatively straightforward.

The more important question is whether your finance processes are giving you enough visibility to respond quickly and confidently when operational changes happen.

The businesses that navigate cost changes best tend to have:

• Clear reporting
• Joined-up finance systems
• Consistent policies
• Better forecasting
• Strong internal communication

That is where finance becomes more than compliance.

At Wilson Partners, we work with ambitious businesses to improve reporting, strengthen processes and give leadership teams better visibility over the decisions that affect profitability, people and growth. Our outsourced finance, budgeting and business advisory teams help businesses move from reactive to proactive decision-making.

Because often, the small operational changes are the ones that reveal where the bigger opportunities, or risks sit.