When we talk about school holidays, the conversation usually revolves around logistics.

Who's taking annual leave? How will teams manage workloads? Can employees adjust their hours for a few weeks?

But beneath those practical conversations is something that's far less visible.

The "default parent".

It's not an official title, but most families know exactly who that person is.

They're listed first on the emergency contact form.

They're the one who remembers that the school has a pupil-free day next Friday, books vacation care months in advance before places fill up, knows which child refuses sandwiches unless the crusts are cut off, remembers the dentist's name without checking the calendar and packs the library books before anyone else realises they're due back.

When the childcare centre calls because someone has a temperature, they already know whose phone is going to ring.

When the school holidays arrive, they're mentally calculating how to cover two weeks of care while still making project deadlines, attending meetings and keeping everything else moving.

Most of these tasks only take a few minutes.

The responsibility for remembering them never really switches off.

This is what researchers refer to as the mental load, the invisible planning, organising and anticipating that keeps family life running smoothly. It's work that often goes unnoticed because, when it's done well, everything simply appears to happen.

While either parent can take on this role, research consistently shows that women continue to shoulder a disproportionate share of unpaid care. According to the Australian Government's 2025 Status of Women Report Card, women perform an average of 32 hours of unpaid work and care each week, nine hours more than men. Among women in couple families with children under 15, that figure rises to 47 hours every week.

This isn't about who loves their children more or who works harder.

It's about recognising that one person often carries more of the invisible work, and that invisible work can quietly shape careers in ways we don't always recognise.

The Mental Load Doesn't Clock Off

The challenge isn't that the default parent has more jobs to do.

It's that they're responsible for remembering the jobs before anyone else even realises they exist.

They know when the school photos are, which child has outgrown their school shoes, whether there's enough fruit for tomorrow's lunchbox and whose turn it is to bring oranges for Saturday morning sport.

By the time many working parents log on for their first meeting of the day, they've already made dozens of small decisions that no one at work will ever see.

Individually, those decisions seem insignificant.

Collectively, they consume time, energy and mental capacity before the workday has even begun.

For HR leaders, it's an important reminder that two employees working the same hours may not be starting the day with the same cognitive load.

It's Rarely One Big Career Decision

The impact of being the default parent isn't usually one dramatic career sacrifice.

It's dozens of smaller decisions made over many years.

It might be taking unpaid leave every July because annual leave has already been used at Christmas. Dropping back to four days a week while the children are younger. Turning down interstate travel because someone needs to be available for school drop-off on Monday morning. Declining an exciting project because the meetings run until 6pm every Thursday.

None of those decisions, on their own, seem career defining.

But together, they can influence salary progression, promotion opportunities and long-term financial security.

Working fewer hours often means slower salary growth. Unpaid leave can reduce employer superannuation contributions. Passing on leadership opportunities or high-profile projects may affect future promotions and bonuses.

Over time, those seemingly small decisions compound.

Research from the Workplace Gender Equality Agency has consistently found that unequal unpaid care responsibilities are one of the key drivers of workforce participation differences, the gender pay gap and the gap in lifetime superannuation balances.

For many employees, the career cost isn't immediate.

It's something that quietly accumulates over years.

What Does This Mean for HR?

Most organisations have invested heavily in workplace flexibility over recent years.

The next challenge is making sure flexibility doesn't unintentionally lead to different career outcomes.

That starts with asking some honest questions.

Are employees who work flexibly still being offered stretch projects and leadership opportunities?

Are managers assessing performance based on outcomes rather than visibility?

Do employees feel comfortable accessing flexibility, or do they worry it will affect how they're perceived?

And are leaders aware that the person declining the interstate conference or leaving at 4.30pm every Wednesday may not be any less ambitious, they may simply be carrying responsibilities that aren't immediately visible?

These aren't questions about giving anyone special treatment.

They're questions about making sure talented people aren't quietly falling behind because of circumstances outside their control.

Looking Beyond School Holidays

School holidays bring these challenges into sharper focus, but they don't create them.

The reality is that caring responsibilities exist throughout the year, and for many employees they're largely invisible to the people they work with every day.

Great workplaces don't just recognise the work people do at their desks.

They also understand that some employees arrive each morning having already managed another shift before the workday has even begun.

As more Australian families rely on two incomes, organisations have an opportunity to rethink what equitable career progression really looks like.

Because workplace flexibility shouldn't simply help people stay in work.

It should help ensure they can continue to build meaningful careers while they're there.