Teacher Pay vs School Budgets: How Staffing Costs Shape Education Finance

Teacher compensation is usually the largest controllable cost in a school system, so a change in pay rarely stays inside a payroll line. It affects the number of positions a budget can support, the size and composition of classes, the availability of specialist staff, pension contributions, and the money left for buildings, transport, meals, learning materials, and technology. Across OECD countries, staff compensation absorbed 78% of current expenditure at primary and lower secondary levels and 77% at upper secondary level in the data published by the OECD in 2024.^[a] This makes teacher pay both a labor-market decision and an education-finance decision.

What Counts as a Staffing Cost?

A salary schedule shows what an employee earns, but a school budget must record what the employer pays. Base salary normally forms the largest component. The full cost may also include payroll taxes, employer pension contributions, health insurance, social insurance, paid leave, housing or remote-service allowances, bonuses, overtime, and payments for additional duties. Definitions differ across countries, which is why a direct comparison of posted salaries can misstate the financial burden.

Staffing also extends beyond classroom teachers. School leaders, teaching assistants, counsellors, librarians, nurses, therapists, laboratory technicians, administrative employees, maintenance workers, and central-office teams may all appear in staff compensation. OECD data separate staff salaries, pensions, and other benefits when countries can report them. In earlier OECD data covering primary through post-secondary non-tertiary education, salaries accounted for 82% of staff-compensation resources, pensions for 13%, and other non-salary compensation for the remainder. That composition is an OECD average, not a universal ratio.^[b]

A further distinction concerns the payer. A ministry may set salaries while a municipality pays benefits, or a central government may reimburse local authorities through grants. Public schools can therefore have similar salary scales but different local fiscal pressures. The budget view must follow the full funding chain: who sets the obligation, who transfers the money, and who carries any shortfall.

The Mathematics Connecting Pay, Class Size, and Teaching Time

Teacher salary cost per student is not determined by salary alone. OECD methodology links it to four variables: teachers’ salaries, students’ annual instruction hours, teachers’ annual teaching hours, and average class size. The last three determine how much teacher capacity a system needs for a given number of learners.^[c] In simplified form, the relationship can be written as:

The direction of each effect is clear. Higher salaries raise cost per student if other variables remain fixed. More compulsory instruction hours require more teacher time. Fewer annual classroom hours per teacher require more teachers to deliver the same student timetable. Smaller classes increase the number of groups and therefore the number of teaching assignments. These variables interact, so two countries with similar teacher salaries can report very different staffing costs per learner.

OECD 2025 data illustrate the result. Average teacher salary cost was $3,993 per primary student and $4,444 per lower secondary student in 2023, expressed in equivalent US dollars using purchasing power measures. The increase at lower secondary level reflects a mixture of pay, instruction time, teaching hours, and class organization rather than a single salary difference.^[c]

An Illustrative District Calculation

Consider a hypothetical district with 10,000 students. Each student receives 1,000 hours of instruction, each full-time teacher provides 800 scheduled teaching hours, and the average class contains 25 students. The model requires about 500 teacher full-time equivalents: 10,000 × 1,000 ÷ (800 × 25). If base salary averages $60,000 and employer costs add 30%, compensation averages $78,000 per teacher, producing a $39 million teaching-staff bill.

The calculation exposes a common budgeting error. A 5% pay award does not necessarily raise the whole education budget by 5%; it raises the affected salary base and may also raise employer contributions tied to salary. Conversely, a small change in average class size can move dozens of positions in a large system. Average class size also hides scheduling limits: a school cannot place a fraction of a teacher in every subject or close half a classroom.

How Salary Levels Shape Recruitment and Retention

Education authorities compete for graduates and experienced professionals in wider labor markets. In 2024, actual teacher salaries across OECD countries averaged $57,399 at primary level, $59,896 in general lower secondary programs, and $63,514 in general upper secondary programs, using purchasing power parity rather than market exchange rates. Yet the relative-pay measure is more revealing: primary teachers earned 83% of the income of tertiary-educated full-time workers, lower secondary teachers 87%, and upper secondary teachers 91%.^[d]

Those averages cover wide national variation. OECD data place the statutory salary of a primary teacher with the prevalent qualification and 15 years of experience at $26,913 in the Slovak Republic and above $90,000 in Germany, Luxembourg, and the Netherlands, again in purchasing-power-adjusted dollars. The OECD average at that career point was $59,673 for primary teachers. These values compare domestic purchasing power; they are not the US-dollar amount a teacher would receive after currency conversion.

Career structure matters as much as the average. Across the OECD countries with comparable data, starting statutory salaries rose by 14–17% in real terms between 2015 and 2024, while salaries after 15 years rose by 4–6%.^[d] A stronger starting rate can improve entry into teaching, but compressed progression may weaken mid-career retention unless systems provide additional roles, allowances, or advancement routes. A steep scale has the opposite fiscal pattern: it looks less costly when a workforce is young, then rises as large cohorts move through salary steps.

Vacancies Carry Costs Even When Posts Are Unfilled

An unfilled post may appear to save salary, but the operational response can cost money elsewhere. Schools may use substitutes, overtime, larger classes, out-of-field assignments, agency staff, or reduced course offerings. Recruitment campaigns, relocation support, and repeated induction add further costs. The vacancy line alone therefore understates the financial effect of a shortage.

OECD 2025 shortage data show that unfilled fully qualified teaching posts remained below 3% of all teaching posts in 12 of 14 reporting systems; Austria and Sweden were above 4%. Across 19 systems, an average of 6.5% of fully qualified teachers left the profession in 2022/23. More than one-third of primary and secondary teachers across the OECD were aged 50 or older in 2023, while only 9% of secondary teachers were under 30.^[e] These figures point to a budget issue extending beyond current vacancies: replacement needs can arrive in waves.

The global scale is larger. UNESCO estimates that the world needs 44 million additional primary and secondary teachers by 2030 to reach universal primary and secondary education, including 15 million in sub-Saharan Africa. More than half of the global requirement concerns replacement of teachers expected to leave the profession, while the remainder reflects expansion.^[f] Expansion and replacement create different financial demands: expansion requires new posts and often new classrooms, while replacement requires a reliable training and recruitment pipeline even when total headcount remains stable.

Why Higher Pay Does Not Produce One Predictable Budget Outcome

A pay increase can raise the wage bill immediately, yet its medium-term cost depends on behavior. Better compensation may reduce resignations, lower vacancy duration, improve applicant supply, and reduce reliance on temporary staff. The budget can recover part of the added salary cost through lower turnover and more stable staffing. The size of that offset varies by labor market, subject, location, workload, leadership quality, and alternative employment available to qualified teachers.

Across-the-board increases are simple to administer and preserve a common scale. Targeted payments direct money toward a defined staffing pressure, such as mathematics, science, special education, early childhood education, remote schools, or high-cost cities. Targeting uses fewer dollars for the same nominal payment, though eligibility boundaries can create pay differences between employees whose work appears similar. A temporary allowance may fill an immediate gap but provide little retention value if teachers expect it to expire.

• Base-pay increases recur each year and may flow into pensions, payroll taxes, and future percentage awards.
• One-time payments address a short period but do not permanently lift the salary scale.
• Shortage-subject allowances focus on hard-to-fill fields but require regular evidence that the shortage remains.
• Location allowances recognize housing, travel, isolation, or recruitment conditions in particular areas.
• Responsibility payments compensate mentoring, department leadership, counselling, or other additional duties.
• Retention payments depend on continued service and should be evaluated against actual departure rates.

Timing also changes the first-year figure. A 6% award beginning halfway through a fiscal year costs roughly 3% of the annual salary base in that year, before linked benefits, but the full 6% appears in the next budget even without another agreement. This carry-forward cost is easy to miss when decision makers focus only on the settlement-year appropriation.

What Staffing Costs Displace Inside a Fixed Budget

When revenue does not rise with compensation, a school system must change another variable. It can hold posts vacant, increase class sizes, reduce non-teaching staff, defer maintenance, limit materials, narrow optional courses, postpone technology replacement, or seek added funding. None of these responses is automatic, and some expenses cannot be changed quickly because of contracts, safety requirements, transport routes, or minimum service standards.

The size of the non-staff margin explains why modest pay changes can dominate budget negotiations. OECD data for 2021 showed that staff compensation represented 78% of current spending at non-tertiary levels, with salaries making up most of that compensation.^[b] If staffing consumes 78 dollars of every 100 dollars in current expenditure, the remaining 22 dollars must cover many daily services. A 5% rise applied across the whole staff-compensation base adds 3.9 dollars before any workforce change, which equals nearly 18% of the original non-staff current budget.

Capital budgets require separate treatment. Delaying a building project may release cash under some accounting systems, but it does not create a dependable source for permanent salaries. A one-year asset sale, reserve withdrawal, or construction deferral cannot support a recurring pay scale without a future replacement plan. Recurring commitments need recurring revenue.

National Wealth and Spending Effort Are Different Measures

OECD governments spent an average of $12,438 per student on primary, secondary, and post-secondary non-tertiary institutions in 2022. The reported national range ran from below $4,000 in Mexico and Türkiye to about $21,000 or more in Korea, Luxembourg, and Switzerland. Primary and secondary education together represented 3.3% of GDP on average. Education from primary through tertiary level accounted for 10.1% of total government expenditure, down from 10.9% in 2015.^[g]

Dollar spending, spending as a share of GDP, and spending as a share of the public budget answer different questions. The first describes purchasing capacity after an agreed conversion method. The second reflects education resources relative to national income. The third shows priority within government expenditure. A lower-income country may devote a larger share of GDP to schools yet still spend far fewer dollars per learner. Teacher salary comparisons should therefore use both absolute purchasing power and relative fiscal effort.

World Bank and UNESCO analysis reported that annual government education expenditure per school-age child in low-income countries was no more than $55 in 2022, or $172 after purchasing-power adjustment. Total global education spending had risen over the preceding decade, but spending per child had stagnated or declined as enrolment and the school-age population grew. Education aid reached $16.6 billion in 2022, while its share of total development aid fell from 9.3% in 2019 to 7.6% in 2022.^[h] In that setting, even a low teacher salary can absorb much of an education budget because the total resource envelope is small.

Enrolment Changes Alter the Staffing Equation

A growing system must recruit teachers fast enough to prevent rising pupil-teacher ratios. It may also need new schools, training capacity, management, and transport. A shrinking system faces the reverse problem: costs do not fall in direct proportion to student numbers. Schools need a minimum number of teachers to cover grades and subjects, and small communities may have no nearby school with which to consolidate.

Imagine a school losing 8% of enrolment across several grades. It cannot necessarily remove 8% of its teaching posts because each remaining grade still needs a teacher and the timetable still needs subject coverage. Per-student cost rises even when total spending stays flat. At district level, savings may appear only when enrolment loss is concentrated enough to combine classes, reduce sections, or close a site. This is why demographic forecasts need school-level geography rather than a national total alone.

OECD 2025 finance data illustrate this denominator effect. Between 2015 and 2022, expenditure per student rose in most member countries, and in several systems falling enrolment contributed to that increase. Across primary through post-secondary non-tertiary education, enrolment rose by 2.1% on average while overall expenditure increased by 14.7%, producing an 11.9% rise in spending per student.^[g] A higher per-student figure may therefore reflect added services, higher pay, fewer students sharing fixed costs, or a mixture of all three.

Budget Distribution Can Matter as Much as the Total

Two school systems with the same payroll can distribute teachers very differently. Uniform funding per student does not automatically provide equal service when schools differ in size, remoteness, student needs, language provision, or local labor costs. Small schools require minimum staffing; special education may require lower ratios; vocational programs need specialized instructors and equipment; and remote schools may need housing or travel support.

Teacher experience also changes spending by school. Where pay rises with service, a school staffed mainly by experienced teachers has a higher payroll than one staffed mainly by entrants, even with identical headcount. If funding formulas ignore the difference and a central authority pays salaries directly, the distribution is hidden from school budgets. If schools receive a fixed cash allocation and pay staff from it, schools with experienced teams may have less room for other resources. Neither arrangement should be assessed without identifying who bears the salary variation.

Weighted student funding can recognize additional needs, but weights must connect to actual costs. A remote-school weight may cover a recruitment allowance but still fail to fund the minimum timetable. A disability weight may not match the cost of a therapist shared across several sites. The most informative analysis compares funding, staffing entitlement, actual FTE, vacancy rates, and student need at the same geographic level.

Salary Schedules Create Long-Term Commitments

Many public systems use salary steps based on experience and columns based on qualifications or roles. The annual wage bill can rise even when the published scale and headcount do not change, because employees progress to higher steps. This movement is often called salary drift. Retirements may partly offset it when highly paid employees are replaced by entrants, but the offset depends on replacement rates and the position of both employees on the scale.

Employer pension costs introduce another layer. A defined contribution may be a stable percentage of salary, causing pension expense to move with pay. A defined-benefit plan can require additional contributions when investment returns, actuarial assumptions, longevity, or past underfunding change. Some governments report pension contributions inside education expenditure; others record part of the liability elsewhere. Cross-country comparisons must check this accounting boundary.

Multi-year forecasts should therefore separate at least six movements: negotiated scale changes, automatic step progression, qualification changes, workforce growth or reduction, turnover-related salary differences, and employer on-cost rates. Combining them into one percentage hides the cause of overspending. It also makes later revisions harder when enrolment, inflation, or retirement behavior changes.

Measures That Reveal Whether a Staffing Budget Is Sustainable

No single ratio proves that a school system spends too much or too little on staff. A high compensation share may reflect a labor-intensive service, low capital spending in that year, or limited funding for materials. A low share may reflect a construction program rather than generous classroom resources. The measures below work best as a connected set.

The pupil-teacher ratio and class size must not be used as synonyms. The first divides learners by teacher FTE across a system; it may include specialist teachers and teachers outside a homeroom at a given moment. Class size counts students assigned to a particular class. A school can have a low pupil-teacher ratio and still run large classes if many teachers provide specialist instruction, planning coverage, small intervention groups, or non-classroom duties.

Data Quality Determines the Reliability of the Result

Payroll, personnel, enrolment, timetable, and school-finance records often use different identifiers and reporting dates. A payroll may include staff on leave, while a school census records only employees present. Headcount may mix part-time and full-time work. Authorized posts may remain in a staffing table after a school stops using them. Reconciliation should occur before calculating unit costs.

UNESCO’s Institute for Statistics defines government education expenditure from current and capital outlays reported through national finance and education systems. GDP data used for the percentage-of-GDP indicator come from the World Bank’s World Development Indicators. The definition sounds simple, but country reporting still varies in coverage, accounting treatment, and data year.^[i] International comparisons should retain the source year, education level, institutional coverage, and conversion method beside every figure.

Reading Teacher Pay and School Budgets Together

Teacher pay cannot be judged from one budget share. Low salaries may coexist with a high staffing share when the total education budget is small. High salaries may coexist with a manageable share when national revenue and per-student funding are high. Smaller classes may cost more than a comparable salary increase, while higher pay may support recruitment without changing authorized headcount. The financial result depends on both price, meaning compensation per employee, and quantity, meaning the FTE required to deliver the timetable.

Current education reforms add new staffing demands through digital curricula, student support, expanded early learning, and revised assessment systems. Country changes documented during 2025 show that curriculum and service reforms can require teacher training, specialist recruitment, or new workload allocations even when enrolment stays stable.^[j] A reform budget that funds equipment but omits teacher time records only part of the cost.

A durable staffing plan connects the negotiated salary scale to enrolment by school and grade, timetable requirements, class formation, turnover, pensions, and revenue forecasts. It also preserves enough non-staff funding for schools to operate. In education finance, payroll is not simply one line among many. It is the recurring commitment through which most classroom capacity is purchased, and its effects reach nearly every other line in the school budget.

Sources

1. [a] OECD: On What Resources and Services Is Education Funding Spent? Reports the distribution of current expenditure between staff compensation and other operating resources.
2. [b] OECD: On What Resources and Services Is Education Funding Spent? Provides the salary, pension, and other-benefit composition of staff compensation.
3. [c] OECD: Which Factors Influence Teachers’ Salary Cost? Defines how salary, class size, instruction time, and teaching time determine cost per student.
4. [d] OECD: How Much Are Teachers and School Heads Paid? Supplies 2024 salary levels, career-scale trends, and comparisons with tertiary-educated workers.
5. [e] OECD: How Severe Are Teacher Shortages Across Countries? Reports vacancies, attrition, qualifications, and the age profile of the teaching workforce.
6. [f] UNESCO: Global Report on Teachers: Addressing Teacher Shortages and Transforming the Profession Presents the global and regional estimates of additional teachers needed by 2030.
7. [g] OECD: System-Level Indicators of Education Finance Reports 2022 spending per student, GDP shares, public-budget shares, and changes since 2015.
8. [h] World Bank: Education Finance Watch 2024 Tracks global education spending, spending per child, aid, debt pressure, efficiency, and reporting gaps.
9. [i] UNESCO Institute for Statistics: Government Expenditure on Education as a Percentage of GDP Defines the indicator and identifies the administrative and national-accounts data behind it.
10. [j] Education by Country: The 2025 Education Review: A Global Overview of School Systems Summarizes 2025 curriculum, assessment, technology, and funding changes that can alter staffing requirements.