Tax season does not care about your staffing problems. In the UK, the window between January and early April — Self Assessment deadline on 31 January, tax year end on 5 April — is when accounting firms run at full capacity. In Australia, the equivalent crunch runs from July to October around the 30 June financial year end. One unplanned absence during these weeks can mean missed client deadlines, late filings, and reputational damage that takes months to repair.
For small practices with five to twenty staff, there is no slack in the system. Every person who is off shifts work onto colleagues who are already stretched. And yet most small firms still manage leave through email threads, shared spreadsheets, or informal conversations with a senior partner. That approach barely works in quiet months. During tax season, it fails.
This guide covers why tax season leave needs a different approach, the real cost of getting it wrong, and five rules that keep small practices staffed when it matters most.
Why Tax Season Leave Is Different
Most businesses have busy periods. What makes tax season different for accounting firms is the combination of three factors that do not appear together in many other industries.
Client deadlines are immovable. HMRC does not extend the 31 January Self Assessment deadline because your senior accountant booked a week in Tenerife. Late filing penalties hit your clients — and your reputation. In Australia, the ATO’s lodgement deadlines are equally rigid. There is no rescheduling.
Small teams mean every person matters. A ten-person practice losing one team member for a week during January loses 10% of its capacity at peak demand. In a larger organisation, that absence gets absorbed. In a small firm, it means someone works evenings or a client gets pushed back.
Seasonal contractors complicate tracking. Many practices bring in temporary staff for tax season — contract bookkeepers, junior accountants on fixed-term arrangements, or freelance tax preparers. These people need leave tracked too, but they often fall outside the systems used for permanent staff. The result is blind spots: you think you have full coverage, but your contractor booked two days off that nobody recorded.
The Real Cost of Poor Leave Visibility
When you cannot see who is off and when, problems compound quickly during tax season.
Missed client deadlines. Two team members book overlapping leave in the same week. Nobody notices until Monday morning when the workload cannot be covered. Client deliverables slip. In the worst cases, filing deadlines are missed and your client faces penalties.
Double-booked leave. Without a shared view of team availability, approvals happen in isolation. A partner approves one request by email on Tuesday, another on Thursday, and only discovers the overlap on Friday. By then, the first person has already booked flights.
Scrambling to find cover. When someone calls in sick during an already understaffed week, there is no plan B. You end up calling former employees, asking staff to cancel their own plans, or pulling all-nighters yourself. None of these are sustainable.
The root cause is almost always the same: manual tracking methods that cannot keep pace with real-time changes. A spreadsheet updated once a week does not reflect the leave request that came in this morning. An email approval chain does not show the practice manager which days are already at minimum staffing.
Five Rules for Managing Leave During Busy Season
These are practical rules drawn from how well-run small practices handle tax season staffing. None of them require expensive software or complex policies — just discipline and visibility.
1. Set blackout periods early and communicate them by November
If your busy season runs January to April, your team needs to know the leave restrictions before they book Christmas holidays. Publish your blackout or restricted periods by November at the latest. Be specific: state the exact dates, whether leave is fully blocked or simply restricted, and what exceptions exist (emergencies, pre-approved commitments).
Clarity prevents conflict. When staff know the rules in advance, they plan around them. When restrictions appear last-minute, you get resentment and requests to honour holidays already booked.
2. Use first-come-first-served with visibility — not “ask the partner”
Informal approval systems break down under pressure. “Ask Sarah” works when two people want a Friday off in June. It does not work when six people want time off in the same fortnight during January.
Replace informal requests with a visible, first-come-first-served system. Everyone should be able to see which dates are already taken before they request leave. This removes the politics of who gets priority and gives the team confidence that the process is fair. For more on handling these situations, see our guide on managing leave requests during peak periods.
3. Stagger leave across the team — never more than one person off at once
Set a maximum number of concurrent absences for your team size. For a practice of ten, that might mean no more than one person off at any time during tax season. For a team of twenty, perhaps two.
The specific number depends on your workload and client commitments. The point is to define it explicitly and enforce it through your leave system. If the cap is reached for a given week, subsequent requests for that week are declined — no exceptions, no awkward conversations.
4. Track contractor and seasonal staff alongside permanent team
Temporary staff need to be in the same leave tracking system as everyone else. If your permanent team’s leave is in one spreadsheet and your contractor availability is tracked by email (or not tracked at all), you have an incomplete picture of your capacity.
This is especially important for understanding absence trends across your whole team. A leave tracker that penalises you with per-seat costs every time you add a seasonal worker makes this harder. Look for flat-rate tools that let you add and remove people without worrying about cost.
5. Plan recovery time after tax season
Tax season burnout is real. If your team works intensively from January to April, they need to decompress. Actively encourage leave in May and June — do not just permit it, schedule it.
Block out recovery weeks in advance. Make it clear that the firm expects people to take time off after the crunch. This serves two purposes: it reduces the risk of burnout-related absences later in the year, and it gives your team something to look forward to during the hard months.
What to Look for in a Leave Tracker for Accounting Firms
If you are evaluating leave management tools for your practice, these are the criteria that matter most during tax season.
A team calendar showing who is off at a glance. This is the single most important feature. You need a visual overview of team availability — by day, by week — that updates in real time. No more checking spreadsheets or asking around.
Flat-rate pricing that handles seasonal staff. Accounting practices scale up and down throughout the year. Per-seat pricing punishes you for adding three contractors in January and removing them in May. Look for tools that charge a flat monthly rate regardless of headcount.
Quick setup with minimal configuration. You cannot afford a month-long implementation project in December when you are preparing for January. The tool should be usable within a day, not a quarter.
Integration with Slack or Microsoft Teams. Your team already communicates in these tools. Leave requests, approvals, and notifications should happen where the conversation already is — not in a separate portal that people forget to check.
Frequently Asked Questions
Can you restrict leave during tax season?
Yes. UK employers have the legal right to refuse or restrict leave requests during specific periods, provided they follow the notice requirements under the Working Time Regulations 1998. You must give counter-notice equal to the length of the leave requested. The key is to communicate restricted periods well in advance — ideally by November for a January-to-April busy season. In Australia, the Fair Work Act allows reasonable refusal of leave requests during peak operational periods.
How do you track seasonal staff leave?
Use a leave management tool that does not charge per seat. Flat-rate pricing means you can add contractors and temporary staff without increasing your costs. The important thing is that seasonal workers appear on the same team calendar as permanent staff, so you have a complete view of who is available on any given day.
When should you start planning team leave for tax season?
Start in November. Publish your blackout periods, set maximum concurrent absences, and ask staff to submit any essential leave requests for the January-to-April window before December. This gives everyone time to plan around the restrictions and reduces last-minute conflicts.
Keep Your Practice Staffed When It Matters Most
Tax season leave management is not about saying no to every request. It is about having the visibility and structure to say yes where possible and no where necessary — before problems occur, not after.
Leave Balance handles all of this for a flat rate of $10/month, with unlimited employees, a shared team calendar, and Slack and Teams integration. No per-seat charges when you bring on seasonal staff. No lengthy setup when you need to be ready by January.