Long Service Milestones: Continuous Service and the Dates That Break It

Calendar duration versus credited service

The elapsed calendar time between a start date and today is a simple calculation. Credited or continuous service is a policy figure, and it may exclude unpaid leave, career breaks, casual periods before permanent employment, or time with a predecessor employer depending on how a transfer was structured.

Calculate the calendar figure first, because it is the baseline everything else adjusts from. Then apply the specific rules that govern the entitlement, keeping each adjustment as a separate visible line rather than folding them into one number.

Use this guide with the right tool: Open the Long Service Leave Calculator for continuous service duration used when checking long-service entitlements. If the question shifts, compare it with the Years of Service Calculator or the Work Anniversary Calculator.

What typically breaks continuity

Resignation and rehire is the clearest break, though some schemes bridge short gaps. Extended unpaid leave may pause rather than break service. Parental leave is usually protected. Transfers between related entities may or may not preserve continuity depending on the structure and the jurisdiction.

The pattern is that paid absence and protected leave usually count, unpaid absence often does not, and the treatment of anything involving a change of employing entity depends entirely on the specific arrangement. None of this can be inferred from dates alone.

Where the rules come from

Long service leave is unusual in being statutory in some jurisdictions and purely contractual in others. Australian states, for example, each have their own statutory scheme with different qualifying periods and accrual rates. Elsewhere it may be a company benefit with terms set entirely by the employer.

Identify which applies before calculating anything, because the qualifying period, the accrual rate and the continuity rules all come from that source. A figure calculated against the wrong scheme is not an approximation; it is unrelated.

Recording it so it can be checked

A defensible service record contains the recognised start date, the reference date, the calendar duration, each adjustment with its reason, and the resulting credited service. Anyone reviewing it should be able to follow the arithmetic without asking questions.

Keep the reference date in the record. Service duration changes daily, so a figure without its as-at date cannot be verified later and will silently become wrong.

Worked example

Starting 1 March 2012 gives 14 years, 5 months and 15 days on 16 August 2026, and 13 years and 11 months after unpaid leave. Try your own start date.

The same record, adjusted line by line

The recording method above is easier to follow on the worked example itself. The calendar line reads: recognised start 1 March 2012, reference date 16 August 2026, calendar service 14 years, 5 months and 15 days — 5,281 days in total, three of them leap days. That is the figure before any scheme rule touches it, and it is the only line in the record that is pure arithmetic.

The first adjustment is the six months of unpaid leave in 2019. Applied as a duration, it takes the credited figure to 13 years, 11 months and 15 days. Applied the other common way, by moving the recognised start forward six months to 1 September 2012 and measuring again, it gives exactly the same answer here — which is reassuring, but not guaranteed in general, as the next case shows. The size of the adjustment is also the size of its consequence. If the governing scheme's qualifying period were 14 years, the calendar figure crossed it on 1 March 2026. The credited figure does not cross it until 1 September 2026. The absence moves the qualifying date by precisely its own length, and a record that shows only the final number hides the fact that the employee was, on the calendar reading, already past the line six months earlier.

Whether an absence is excluded by months or by days matters more than it first appears. Six months of absence from 1 September 2019 to 28 February 2020 covers 181 calendar days. Six months from 1 March to 31 August 2019 covers 184. A scheme that excludes a stated duration treats the two identically; a scheme that excludes the actual days between the absence dates leaves the second employee three days worse off. Neither approach is an error, but they are different rules producing different credited service from identical-looking records, and the record should say which one was applied.

Adjustments also accumulate in the open. Add a second absence to the same record — three months unpaid, 1 February to 30 April 2021, 89 days — and the cumulative shift is nine months, giving credited service of 13 years, 8 months and 15 days against the same calendar figure of 14 years, 5 months and 15 days. Read as a record, the four lines tell the whole story: start, reference date, calendar duration, each exclusion with its dates and its rule, and the credited result. Leave any line out and the figure that remains cannot be checked, only believed.

One more property of the record is worth seeing before relying on it: the gap never closes. Measure the same employee a year later, on 16 August 2027, and the calendar figure has grown to 15 years, 5 months and 15 days while the credited figure has grown to 14 years, 8 months and 15 days. The nine-month difference is identical. Absences excluded early in a career are not diluted by later service; they sit in the record at full size for as long as the record runs, which is why an exclusion agreed casually in 2019 is still deciding a qualifying date in 2026 — and why it deserved a line of its own when it was made.

Common mistakes to avoid

• Treating calendar duration as credited service. They are different figures. Calculate the first, then apply the scheme's rules to get the second.
• Assuming one national rule. Long service leave is state-based in some countries and contractual in others. Identify the governing scheme first.
• Recording service without an as-at date. The figure changes daily and cannot be verified without knowing when it was calculated.

Use the right calculator

Long Service Leave Calculator checks service for entitlements, Years of Service Calculator measures exact service duration, and Work Anniversary Calculator finds the next anniversary.

Finance & ProfessionalLong Service Leave Calculatorcontinuous service duration used when checking long-service entitlements

Finance & ProfessionalYears of Service Calculatorexact employment service duration between two dates

Finance & ProfessionalWork Anniversary Calculatorthe next employment anniversary and completed service years

Frequently asked questions