Pet Insurance Deductibles and Excess: What Do You Pay?

Your dog needs unexpected veterinary treatment. The bill comes to $1,000, and your pet insurance policy says it reimburses 80% of eligible expenses.

Does that mean the insurer will pay $800?

Not necessarily.

You may have a deductible to meet first. Some expenses might be excluded. Your policy may also have reimbursement rules or coverage limits that affect the final payment.

In the UK, you will often see the word excess instead of deductible. You may also have to pay a percentage of the claim, particularly under some policies for older pets.

A deductible or excess is the portion of an eligible insurance claim that you are responsible for paying under your policy’s rules. It is separate from the premium you pay to keep the policy active.

Understanding how these amounts work can help you estimate what you might need to pay when your dog or cat requires treatment.

What is a deductible in pet insurance?

In US pet insurance, a deductible is an amount you must pay toward eligible expenses before the insurer pays benefits according to the policy.

For example, imagine your policy has a $250 deductible.

If you submit a $1,000 veterinary bill and the entire bill is eligible, the deductible may reduce the amount used to calculate your insurance payment.

But the deductible is not necessarily the only amount you will pay.

Your policy might also require you to pay a percentage of eligible expenses, and it may exclude some charges or limit the amount the insurer will reimburse.

The deductible’s amount, how often it applies, and the order in which the insurer calculates payments all matter.

What does excess mean in UK pet insurance?

In UK pet insurance, excess is the amount you agree to contribute toward a claim.

For example, a policy might have a £100 fixed excess.

If you submit an eligible £1,000 claim, you may be responsible for the first £100 before the insurer calculates any additional contribution required by the policy.

Some UK policies also require a percentage co-payment. This means you pay a specified percentage of eligible costs in addition to the fixed excess.

A £100 excess does not necessarily mean £100 is the most you will pay toward a £1,000 veterinary bill.

You may also be responsible for a co-payment, excluded expenses, or costs above the policy’s limits.

Check the policy schedule and claims wording to see exactly how your excess applies.

Are a deductible and an excess the same thing?

They serve a similar purpose: both describe an amount the policyholder contributes toward an eligible claim.

However, the terms are used in different insurance markets, and the way the amount is applied depends on the policy.

US policies may use annual or per-incident deductibles.

UK policies may apply a fixed excess per claim, per condition, or per condition within a policy year. Some also include compulsory and voluntary excess amounts or an additional percentage contribution.

Do not assume that two policies work the same way simply because their deductible or excess amounts are similar.

Annual versus per-incident deductibles in the US

A deductible can apply in different ways.

Annual deductible: You work toward a specified deductible during the relevant policy year. Once you have met it, later eligible claims in that policy year may not require you to meet that same annual deductible again.

Per-incident deductible: A deductible applies separately to each incident, according to how the policy defines an incident.

For example, imagine your dog has two unrelated, eligible health problems during the same policy year.

Under a policy with a $250 annual deductible, the deductible may only need to be met once during that year.

Under a policy with a $250 per-incident deductible, a separate deductible may apply to each of those problems.

That distinction can affect your out-of-pocket costs, especially if your pet needs treatment for several unrelated conditions.

Some policies have other deductible structures, so check the actual contract rather than assuming every deductible resets annually.

How often do you pay excess in UK pet insurance?

The answer depends on the policy.

A fixed excess might apply:

To each claim.
To each separate condition.
Once per condition during a policy year.

Imagine your cat needs several appointments for the same covered condition.

One policy might apply its fixed excess once for that condition during the policy year. Another policy might apply it differently.

If your cat develops a separate condition, an additional excess may be payable.

Before buying insurance, ask when the excess is charged and when it resets.

The policy wording should explain how repeat treatment, separate conditions, and renewal affect the amount you pay.

What is the difference between a deductible and reimbursement?

A deductible is an amount you contribute toward eligible expenses.

Reimbursement describes the amount the insurer pays under the policy’s claims rules.

A policy advertising 80% reimbursement does not necessarily pay 80% of the entire veterinary bill.

The insurer may first determine which expenses are eligible, then apply the deductible and reimbursement rules.

The order of calculation matters. Do not assume every insurer applies the deductible and reimbursement percentage in the same order.

Here is one simplified example of a policy that deducts the remaining deductible before calculating reimbursement.

Example: A $1,000 US veterinary bill

Assume:

The veterinary bill is $1,000.
All $1,000 is eligible under the policy.
You have $250 of deductible remaining.
The insurer reimburses 80% of the eligible amount after the deductible.
No other exclusions or limits affect this claim.

The calculation would be:

Step	Amount
Eligible veterinary bill	$1,000
Less remaining deductible	$250
Amount left after deductible	$750
Insurer pays 80% of $750	$600
Your total share	$400

Your $400 share consists of the $250 deductible plus the remaining $150 that the insurer does not reimburse.

In this example, the insurer pays $600—not $800.

This is an illustration of one calculation method, not a universal pet insurance formula. Another policy may apply its reimbursement percentage and deductible differently.

Ask the insurer to demonstrate how it would calculate a claim using the policy you are considering.

What is a co-payment in pet insurance?

A co-payment is an additional share of eligible treatment costs that you agree to pay.

It is often expressed as a percentage.

In US pet insurance, you may see the terms co-payment, co-insurance, or the owner’s share of expenses not reimbursed by the insurer.

For example, under a policy that reimburses 80% of eligible expenses after the deductible, you are responsible for the remaining 20% of that amount.

In UK pet insurance, a percentage co-payment can apply on top of a fixed excess.

The exact calculation depends on the policy.

Do not confuse a co-payment with the premium you pay each month or year. The premium keeps your insurance active; a co-payment affects what you contribute when you make an eligible claim.

How do fixed excess and percentage co-payment work together in the UK?

Some UK pet insurance policies require both a fixed excess and a percentage contribution toward eligible veterinary expenses.

For example, a policy might have a £100 fixed excess and a 20% co-payment.

Here is how a claim could work when the insurer deducts the fixed excess first and then applies the percentage co-payment to the remaining eligible amount.

Example: A £1,000 UK veterinary bill

Assume:

The veterinary bill is £1,000.
All £1,000 is eligible under the policy.
A £100 fixed excess applies.
You must also pay a 20% co-payment on the remaining amount.
No other exclusions or limits affect the claim.

The calculation would be:

Step	Amount
Eligible veterinary bill	£1,000
Less fixed excess	£100
Amount left after excess	£900
Your 20% co-payment on £900	£180
Insurer pays	£720
Your total share	£280

In this example, you pay £280 toward the £1,000 bill: the £100 fixed excess plus the £180 co-payment.

The insurer pays £720.

This example follows the stated calculation method. Your actual payment depends on your policy’s terms and the eligible claim amount.

Why should owners of senior pets check co-payments?

Some pet insurance policies introduce or increase a percentage co-payment when a dog or cat reaches a specified age.

That means the amount you pay toward eligible treatment may change as your pet gets older.

For example, a policy might require a fixed excess when your pet is younger, then add a percentage co-payment at a later age.

Other policies may use different age thresholds, contributions, or renewal rules.

There is no single age at which every pet insurance policy introduces a co-payment.

If your dog or cat is approaching an age threshold in the policy, check whether your share of future claims will change.

This matters when comparing the ongoing cost of insurance for senior pets—not just the premium shown when you first buy a policy.

What is the difference between a deductible and a coverage limit?

A deductible or excess affects the amount you contribute toward a claim.

A coverage limit restricts how much the insurer will pay under a particular benefit or over a specified period.

A policy may have:

An annual payment limit.
A per-condition or per-incident limit.
A lifetime limit or another maximum defined by the policy.

For example, imagine an eligible claim would otherwise produce a $2,000 insurance payment, but only $1,500 remains available under the applicable coverage limit.

The insurer may pay no more than the remaining $1,500 under that benefit. You would be responsible for the unpaid amount.

Limits can also interact with deductibles, excess and co-payments.

The UK Financial Ombudsman Service explains that, when assessing pet insurance complaints, it expects insurers to deduct applicable excess and co-payment amounts from the claimed amount before applying policy limits.

Do not assume a policy’s advertised coverage limit is the amount you will receive for every claim.

Read the limit alongside the policy’s exclusions and claims-calculation rules.

What if part of the veterinary bill is not covered?

A deductible or excess does not make an excluded expense eligible for reimbursement.

Imagine your dog receives treatment costing $1,000, but the insurer determines that only $700 qualifies under the policy.

The insurer will calculate the payment using its applicable rules for the eligible amount—not necessarily the full $1,000 bill.

You may be responsible for the excluded $300 as well as any deductible, co-payment, or other amount you owe.

That is why a high reimbursement percentage alone does not tell you how much of a veterinary bill the insurer will pay.

Before buying, check which treatments, fees, and conditions the policy includes or excludes.

Does choosing a higher deductible or excess lower your premium?

A policy with a higher deductible or excess may have a lower premium than a comparable policy with a lower owner contribution.

But a lower premium means you could have more to pay when your pet needs eligible treatment.

Consider two otherwise comparable policies:

One has a lower premium but requires you to contribute more toward a claim.

The other has a higher premium but requires a smaller contribution when you claim.

Neither structure guarantees lower total costs for every pet owner.

The amount you pay over time depends on the premiums, your pet’s eligible veterinary expenses, how often you claim, and the policy’s other terms.

Compare the premium and the potential claim-time costs together.

Is pet insurance with no deductible or no excess available?

You may encounter policies advertised as having a zero deductible or no excess.

Check exactly what that means.

A policy with no fixed deductible or excess may still require a percentage co-payment, exclude certain treatments, or impose coverage limits.

The advertised feature might also apply only to a particular product or benefit.

Before purchasing, ask the insurer to confirm your potential contribution to an eligible claim and whether any other deductions apply.

No deductible does not mean every veterinary bill will be paid in full.

What should you check before choosing a policy?

Before comparing premiums alone, ask:

What is the deductible or fixed excess?
Is it annual, per incident, per condition, or per claim?
When does it reset?
Does a percentage co-payment apply as well?
Does that percentage change as my pet gets older?
Which expenses count toward the deductible or excess?
In what order are deductions and reimbursement percentages calculated?
What annual, per-condition, or other payment limits apply?
Are any parts of the veterinary bill excluded?
Can the insurer show me a worked example using this policy’s actual terms?

Keep the insurer’s written explanation with your policy documents.

What if your claim payment is lower than expected?

Ask the insurer for an itemised explanation of how it calculated the payment.

Compare that calculation with the policy’s deductible or excess, co-payment, eligible expenses, exclusions, and applicable limits.

If you believe the insurer has applied the terms incorrectly, ask it to identify the relevant policy clauses and explain the calculation in writing.

You can use the insurer’s complaints process if the explanation does not resolve your concern.

In the UK, the Financial Ombudsman Service considers complaints about the application of excesses, co-payments, and policy limits.

In the US, your state insurance department can provide information about insurance complaints and applicable consumer protections.

The outcome of a complaint depends on the policy, the evidence, and the rules that apply.

The bottom line

A pet insurance deductible or excess is only one part of what you may pay toward your dog’s or cat’s veterinary care.

Your final share can also depend on co-payments, reimbursement rules, excluded expenses, and coverage limits.

For US readers, check whether the deductible is annual or applies separately to incidents, and ask how the insurer calculates reimbursement.

For UK readers, check how often the fixed excess applies and whether a percentage co-payment is added—particularly as your pet gets older.

The most useful question to ask an insurer is not just “What is the deductible or excess?” It is “Can you show me exactly how this policy would calculate an eligible veterinary claim?”

If you are still learning the basics, read our guide to how pet insurance works.

For more on when insurance benefits become available, see our guide to pet insurance waiting periods.

If your pet already has a medical condition, read our guide to pet insurance for pre-existing conditions.