Annual Leave vs PTO: What's the Difference, Explained

Annual leave is a statutory entitlement to paid time away from work, set by law and used for one purpose: rest. PTO — paid time off — is an American policy construct that pools vacation, sick days and personal days into a single balance the employee draws down for any reason.

They are not synonyms with different accents. They differ in who sets the rules, what the time can be used for, and what happens to unused balance when you leave. Confusing them is how multi-country employers end up with policies that are technically unlawful in half their markets.

Key Takeaways

• Annual leave is a legal minimum in the UK, Australia, New Zealand and most of the world. PTO is a voluntary US employer policy.
• PTO pools sickness and vacation into one balance. Annual leave systems keep them strictly separate.
• Under PTO, taking a sick day spends the same balance as a beach holiday. Under annual leave, it does not.
• Never use “PTO” in UK, Australian or New Zealand policy documents — the pooled model conflicts with statutory leave types there.

Definitions, Precisely

Annual leave (UK, Ireland, Australia, most of Europe), also called annual holidays (New Zealand): a statutory minimum quantity of paid time off per year, accrued through service, intended for rest and recreation. Sick leave, parental leave, carer’s leave and public holidays are separate entitlements that do not touch it.

PTO (United States, and increasingly used by global tech firms): a consolidated bank of paid days an employee can use for vacation, illness, appointments, or personal matters, at their discretion. There is no legal minimum behind it. Employers set the accrual rate, the cap, and the payout rules.

Vacation (US): the older, narrower term for the holiday-only portion, still used by employers who keep vacation, sick and personal days in separate buckets rather than pooling them.

The Comparison

	Annual leave	PTO
Legal basis	Statutory minimum	Employer policy only
Typical amount	UK 5.6 weeks; AU 4 weeks; NZ 4 weeks	10–20 days, employer’s choice
Covers sickness?	No — separate entitlement	Yes — same pool
Employer can refuse dates	Yes, with notice and a business reason	Yes, at policy discretion
Payout on leaving	Accrued untaken leave must be paid	Depends on state law and policy
Carry-over	Regulated; often restricted	Employer policy; “use it or lose it” common
Minimum by law	Yes	No federal minimum

The Legal Gap Is the Real Difference

In the UK, almost all workers are legally entitled to 5.6 weeks’ paid holiday a year, capped at 28 days, per GOV.UK. In Australia, full-time and part-time employees get 4 weeks of annual leave under the National Employment Standards, per the Fair Work Ombudsman. In New Zealand, employees get 4 weeks of annual holidays after 12 months’ continuous employment under the Holidays Act 2003, per Employment New Zealand.

In the United States there is no equivalent. The Department of Labor states that the Fair Labor Standards Act “does not require payment for time not worked, such as vacations, sick leave or federal or other holidays” — these are matters of agreement between employer and employee.

That single gap explains almost everything else. Where the law sets a floor, employers administer a fixed entitlement with prescribed rules. Where it does not, employers design whatever policy they like — and pooling everything into one flexible bank is a reasonable design choice in that environment.

Where PTO Quietly Costs Employees

The pooled model has a real advantage: nobody has to justify why they are off, and there is no incentive to invent a stomach bug to get a day for a house move. Our overview of paid time off covers the case for it.

The disadvantage is structural. When sickness and holiday share one balance, illness competes with rest.

A worked comparison. Two employees each take 5 sick days and want a 2-week summer break.

• Marta, UK, 28 days annual leave + separate sick pay. The 5 sick days come from sick leave. She has 28 days of holiday intact and takes her 10-day break with 18 days left.
• Devon, US, 20 days PTO. The 5 sick days come out of the 20. He has 15 left, takes the 10-day break, and finishes the year with 5 days — which he must ration across every appointment, family emergency and illness for the remaining months.

Devon is not being treated badly by US standards; 20 days of PTO is a decent offer. But he is financially penalised for being ill in a way Marta is not, and the predictable result — well documented in US workplace research — is people working through illness to protect their vacation balance.

The Terminology Trap for Global Employers

This is the part that causes real compliance problems.

If you run a US company that hires in London, Sydney or Auckland, exporting your PTO policy does not work:

• UK. Statutory sick pay is a separate legal entitlement. You cannot make employees spend annual leave on sickness, and the 5.6-week entitlement must exist as leave in its own right.
• Australia. Paid personal/carer’s leave is a distinct National Employment Standards entitlement, separate from the 4 weeks of annual leave. Pooling them does not satisfy either.
• New Zealand. The Holidays Act 2003 defines annual holidays, sick leave and bereavement leave as separate entitlements with separate rules. A single pooled bank cannot be reconciled against them.

The practical rule: run separate leave types in every market, and use “PTO” only for US staff. A UK employee handbook that says “PTO” signals to every reader that the policy was written for somewhere else, and it invites arguments about whether sick days come out of holiday.

Language matters here too. “Vacation” and “PTO” are US terms. “Annual leave” and “holiday” are the UK and Australian terms. “Annual holidays” is the New Zealand statutory term. Using the local term is not just courtesy — it aligns your policy document with the legislation a tribunal would read it against.

Which Model Should You Run?

If you are US-only and choosing between pooled PTO and separate buckets:

Choose pooled PTO if you want administrative simplicity, you trust your team, and you would rather not have managers assessing whether someone is genuinely ill.

Choose separate vacation and sick banks if you want people to stay home when they are contagious, or you operate in a state or city with a mandated paid sick leave accrual that has to be tracked distinctly anyway.

Choose separate banks regardless if you employ anyone outside the US. Running two models is more work than running one, but running one non-compliant model across four countries is worse.

If you are considering unlimited PTO, note that it changes the payout position entirely — with no accrued balance, there is usually nothing to pay out on termination. Our post on the pros and cons of unlimited PTO covers the trade-offs, and our guide to creating a PTO policy walks through the accrual and carry-over decisions.

What This Means for You

1. Name your leave types after the local law, not after your head office.
2. Never pool sickness into the holiday balance outside the US. It fails the statutory test in the UK, Australia and New Zealand.
3. Check your carry-over and payout rules per market. “Use it or lose it” is common in US PTO policies and unlawful for statutory leave in several other jurisdictions.
4. If you offer PTO in the US, watch the sick-day dynamic. A separate small sick bank on top of a PTO pool costs little and removes the incentive to work while ill.

Leave Balance lets you define unlimited leave types per country — UK annual leave and statutory sick pay, Australian annual leave and personal/carer’s leave, New Zealand annual holidays and sick leave, US PTO — each with its own accrual, carry-over and approval rules, in one account. Flat $10/month, unlimited employees, 14-day free trial.

This article is general information about leave entitlements across several jurisdictions, not legal advice. Rules vary by country, state and contract — take advice on your own situation.