Each year, the DfE publishes details about the workforce in schools. The data about teacher numbers are collected in the School Workforce Survey, conducted every November.

Included in the data are details about teacher retention in state funded schools. Interestingly, although the DfE provided the actual number of NQTs each year, the retention data is shown as a percentage of that base number. Release home – School workforce in England – Explore education statistics – GOV.UK as demonstrated in the following table.

The picture is obvious, despite some late arrivals after qualifying, the percentage falls for each extra year of service, so that of the 2010 cohort, only 59.2% were still in service after 10 years.

 Over the past few years, the percentage in service after one year has fluctuated from a low of 85.1 for the 2016 cohort to a high of 89.9 for 2023 cohort, with the 2024 cohort still doing well, with a retention rate of 89.7% at year 2. This looks like good news for the government.

However, there is less good news for the cohort that joined during covid in 2020 and 2012. For these two cohorts, retention after four and five years is poor, and back to levels last seen in 2014 for the 2021 cohort.

So, good news, retention is improving. Might the government even meet its target of of 6,500 extra teachers? Now it is time to change the percentages into numbers.

Here the picture is different. I have projected an extra year for the 2024 cohort and two years for the 2023 cohort just to show what might happen. The behaviour of those two cohorts is very important as they represent the lowest intakes of NQTs since 2010. Sadly, the government doesn’t publish the table by sectors. This is important because it is the key secondary subjects that already start with shortages where retention really matters for the performance of the school system, and especially for the outcomes for children in schools with high percentages of pupils on Free School Meals.

The current ten-year loss numbers show a worrying trend.

Hopefully, this loss of experienced teachers will reduce over the next few years, as the cohorts following the 2015 cohort have better retention numbers and percentages. The real concern is the 2020 and 2021 cohorts.

However, with falling rolls, starting to appear in the secondary sector, and already seriously affecting the primary sector in London, the retention rates for teachers may well improve, if schools can continue to afford the same number of teachers.

As my previous posts have made clear, the relationship between the National Funding Formula and pupil numbers will be crucial to future size of the teaching force. Falling Rolls: Is the funding formula making matters worse? | John Howson