Mileage Reimbursement vs Actual Calculator
Whether your mileage allowance covers your real cost.
Compare mileage reimbursement against actual driving costs per mile, including fuel, maintenance, and depreciation, to find your annual surplus or shortfall.
What this tool does
This calculator shows whether your annual mileage reimbursement covers your real driving costs. It works by comparing your reimbursement rate per mile against your actual per-mile expense, then multiplying the difference by your total annual business miles. The result displays your annual surplus—money left over after costs—or shortfall, the gap you cover yourself. Your real cost per mile is the primary driver of the outcome and should include fuel, maintenance, tyres, and a proportional share of fixed costs like insurance and depreciation. A typical use case is comparing a fixed employer allowance against tracked expenses to understand net financial impact. The calculation assumes consistent costs throughout the year and doesn't account for tax treatment or regional variations in fuel prices. Results are for illustration only.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
If you're reimbursed 0.45 per mile and your real cost is 0.32 per mile, 8,000 business miles produce a 1,040 surplus. If real cost exceeds reimbursement, you're effectively subsidising the employer — worth raising at salary review.
What the result means
A positive figure means the allowance covers more than actual cost. Negative means you're out of pocket. Use the result to decide whether to push for a upper rate or use a company car instead.
Quick example
With reimbursement per mile of 0.45 and real cost per mile of 0.32 (plus annual business miles of 8,000), the result is 1,040.00. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
Which inputs matter most
You enter Reimbursement Per Mile, Real Cost Per Mile, and Annual Business Miles. Two inputs usually tip the answer one way or the other. Identify which ones matter most by flipping each value past a round threshold and watching whether the option with the lower calculated total changes.
What's happening under the hood
Net surplus is reimbursement rate minus real cost rate, times annual business miles. Real cost should include fuel, maintenance, tyres, and a share of fixed costs (insurance, depreciation). The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
When to actually change the habit
Most lifestyle spending delivers real value. The exceptions are the ones that stopped delivering months ago but got auto-renewed anyway, and the ones chosen out of defaults rather than preference. Run this, then audit for those two categories — that's where the easy wins live.
What this doesn't capture
The tool prices the money; it can't weigh the enjoyment. A coffee habit, gym membership, or streaming bundle might cost what the math says but deliver value that's harder to quantify. Use the number to make the trade-off visible — the decision is yours.
Driving 8,000 miles annually at £0.32 per mile costs 1,040.00 more than your £0.45 reimbursement rate covers.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
This calculator computes net reimbursement by taking the difference between your reimbursement rate per mile and your real cost per mile, then multiplying by total annual business miles driven. The model treats both rates as constant throughout the year and assumes miles driven remain static. Real cost per mile should incorporate variable expenses such as fuel and consumables, as well as a proportional allocation of fixed costs including insurance and depreciation. The calculator does not account for one-off repairs, regional fuel price variation, changes in vehicle value, or tax treatment of any surplus or shortfall. Results reflect a simplified annual snapshot and do not model fluctuations in driving patterns or cost inflation over time.
References
Frequently Asked Questions
What's a real per-mile cost?
What about tax?
If I'm losing money?
Multiple cars?
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